using cmake to build project and submodules

2021-10-18 17:20:39 +01:00
parent aff6d66622
commit 2faa518b32
52 changed files with 356 additions and 119 deletions
--- a/RpiLedBars/backend/.clang-format
+++ b/RpiLedBars/backend/.clang-format
@@ -0,0 +1,149 @@
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--- a/RpiLedBars/backend/.gitignore
+++ b/RpiLedBars/backend/.gitignore
@@ -0,0 +1,14 @@
+bin
+obj
+CMakeLists.txt.user
+CMakeCache.txt
+CMakeFiles
+CMakeScripts
+Testing
+Makefile
+cmake_install.cmake
+install_manifest.txt
+compile_commands.json
+CTestTestfile.cmake
+_deps
+build
--- a/RpiLedBars/backend/CMakeLists.txt
+++ b/RpiLedBars/backend/CMakeLists.txt
@@ -0,0 +1,10 @@
+cmake_minimum_required(VERSION 3.12)
+
+# set the project name
+project(RpiLedBars VERSION 0.5 LANGUAGES C)
+
+set(CMAKE_C_STANDARD 99)
+
+add_subdirectory(libs)
+
+add_subdirectory(src)
--- a/RpiLedBars/backend/README.md
+++ b/RpiLedBars/backend/README.md
@@ -0,0 +1,87 @@
+# RpiLedBars
+
+LedBars version for raspberry pi
+
+## Contains
+* a python test program (main.py)
+* a C program using :
+  * ws2812 with dma/smi from Jeremy P Bentham - https://iosoft.blog/category/neopixel/
+  * artnet from Stephan Ruloff - https://github.com/rstephan/ArtnetnodeWifi
+
+## Install
+
+### I2S Microphone
+
+#### Install dependencies
+~~~bash
+sudo apt install python3-pip
+sudo pip3 install --upgrade adafruit-python-shell
+~~~
+
+#### Build and install module
+~~~bash
+cd /tmp
+sudo wget https://raw.githubusercontent.com/adafruit/Raspberry-Pi-Installer-Scripts/master/i2smic.py
+sudo python3 i2smic.py
+~~~
+
+After a kernel update this step as to be executed again (after reboot -> depends on `uname`)
+
+#### Test microphone
+
+Plug the microphone
+~~~bash
+sudo reboot
+arecord -l
+arecord -D plughw:1 -c1 -r 48000 -f S32_LE -t wav -V mono -v file.wav
+~~~
+
+#### Control record volume
+~~~bash
+cp res/.asoundrc ~/.asoundrc
+~~~
+
+* Intall i2s mems microphone - https://learn.adafruit.com/adafruit-i2s-mems-microphone-breakout/raspberry-pi-wiring-test
+* Configuring alsa - https://makersportal.com/blog/recording-stereo-audio-on-a-raspberry-pi
+* Alsa API - http://www.equalarea.com/paul/alsa-audio.html
+
+### Project depenencies
+
+~~~bash
+sudo apt install libasound2-dev wiringpi
+~~~
+
+#### Cava
+
+~~~bash
+sudo apt install libfftw3-dev libasound2-dev libtool automake
+cd cava_
+./autogen.sh
+./configure
+make
+sudo make install
+~~~
+
+### Access point
+
+~~~bash
+grep "Access point conf" $(find /etc -type f)
+~~~
+
+* https://learn.sparkfun.com/tutorials/setting-up-a-raspberry-pi-3-as-an-access-point/all
+
+## Biblio:
+
+### Art-Net
+* Protocol Spec : 
+  * https://art-net.org.uk/how-it-works/
+  * https://artisticlicence.com/WebSiteMaster/User%20Guides/art-net.pdf
+* ESP32 library from Stephan Ruloff - https://github.com/rstephan/ArtnetnodeWifi
+
+### ws28xx rgb leds
+* ws2812 datasheet - https://cdn-shop.adafruit.com/datasheets/WS2812.pdf
+* ws2815 datasheet - https://pdf1.alldatasheet.com/datasheet-pdf/view/1134588/WORLDSEMI/WS2815B.html 
+* ws2812 with dma/smi from Jeremy P Bentham :
+  * ws2812 - https://iosoft.blog/2020/09/29/raspberry-pi-multi-channel-ws2812/
+  * dma - https://iosoft.blog/2020/05/25/raspberry-pi-dma-programming/
+  * smi - https://iosoft.blog/2020/07/16/raspberry-pi-smi/
--- a/RpiLedBars/backend/cava_config
+++ b/RpiLedBars/backend/cava_config
@@ -0,0 +1,24 @@
+[general]
+framerate = 60
+autosens = 0
+sensitivity = 200
+bars = 128
+
+[input]
+method = alsa
+source = plughw:1
+
+[output]
+method = raw
+channels = mono
+mono_option = left
+data_format = ascii
+ascii_max_range=65535
+bit_format = 16bit
+
+[smoothing]
+integral = 77
+monstercat = 0
+waves = 0
+gravity = 0
+
--- a/RpiLedBars/backend/cava_config_namedpipe
+++ b/RpiLedBars/backend/cava_config_namedpipe
@@ -0,0 +1,25 @@
+[general]
+framerate = 60
+autosens = 0
+sensitivity = 200
+bars = 128
+
+[input]
+method = alsa
+source = plughw:1
+
+[output]
+method = raw
+channels = mono
+mono_option = left
+raw_target = /tmp/cava_output
+data_format = ascii
+ascii_max_range=65535
+bit_format = 16bit
+
+[smoothing]
+integral = 0
+monstercat = 1
+waves = 0
+gravity = 0
+
--- a/RpiLedBars/backend/cava_test
+++ b/RpiLedBars/backend/cava_test
@@ -0,0 +1,25 @@
+[general]
+framerate = 60
+autosens = 0
+sensitivity = 200
+bars = 20
+
+[input]
+method = alsa
+source = plughw:1
+
+[output]
+method = raw
+channels = mono
+mono_option = left
+;raw_target = /tmp/cava_output
+data_format = ascii
+ascii_max_range=65535
+bit_format = 16bit
+
+[smoothing]
+integral = 0
+monstercat = 0
+waves = 0
+gravity = 0
+
--- a/RpiLedBars/backend/install.sh
+++ b/RpiLedBars/backend/install.sh
@@ -0,0 +1,5 @@
+# make
+cp ./bin/pixled bin/service_pixled
+sudo -s bash -c "cp pixled.service /etc/systemd/system; systemctl daemon-reload"
+# sudo -s bash -c "systemctl enable pixled"
+sudo -s bash -c "systemctl restart pixled"
--- a/RpiLedBars/backend/libs/CMakeLists.txt
+++ b/RpiLedBars/backend/libs/CMakeLists.txt
@@ -0,0 +1,14 @@
+include(FetchContent)
+
+FetchContent_Declare(
+  logc
+  GIT_REPOSITORY "https://github.com/Tropicananass/log.c.git"
+)
+
+FetchContent_Declare(
+  ws
+  GIT_REPOSITORY "https://github.com/Tropicananass/wsServer.git"
+)
+
+# add the log.c and ws libraries
+FetchContent_MakeAvailable(logc ws)
--- a/RpiLedBars/backend/pixled.service
+++ b/RpiLedBars/backend/pixled.service
@@ -0,0 +1,12 @@
+[Unit]
+Description=pixled
+After=network.target
+
+[Service]
+ExecStart=pixled -n 60 -d 2
+Restart=always
+User=root
+Group=root
+
+[Install]
+WantedBy=multi-user.target
--- a/RpiLedBars/backend/sgdb.sh
+++ b/RpiLedBars/backend/sgdb.sh
@@ -0,0 +1,3 @@
+#! /bin/bash
+
+sudo /usr/bin/gdb "$@"
--- a/RpiLedBars/backend/src/CMakeLists.txt
+++ b/RpiLedBars/backend/src/CMakeLists.txt
@@ -0,0 +1,14 @@
+
+add_subdirectory(tasks)
+add_subdirectory(drivers)
+
+# add the executable
+add_executable(${PROJECT_NAME}
+    rpi_midi_controller.c
+    rpi_param.c
+    rpi_pattern.c
+    main.c)
+
+target_link_libraries(${PROJECT_NAME} PRIVATE m asound)
+target_link_libraries(${PROJECT_NAME} PRIVATE logc)
+target_link_libraries(${PROJECT_NAME} PRIVATE ${PROJECT_NAME}_tasks ${PROJECT_NAME}_drivers)
--- a/RpiLedBars/backend/src/drivers/CMakeLists.txt
+++ b/RpiLedBars/backend/src/drivers/CMakeLists.txt
@@ -0,0 +1,14 @@
+# add the executable
+add_library(${PROJECT_NAME}_drivers
+    common.c
+    dma/rpi_dma.c
+    dma/rpi_videocore.c
+    gpio/rpi_gpio.c
+    leddriver/rpi_leddriver.c
+    selector/rpi_selector.c
+    smi/rpi_smi.c)
+
+target_link_libraries(${PROJECT_NAME}_drivers PRIVATE wiringPi)
+target_link_libraries(${PROJECT_NAME}_drivers PRIVATE logc)
+
+target_include_directories(${PROJECT_NAME}_drivers PUBLIC dma gpio leddriver selector smi)
--- a/RpiLedBars/backend/src/drivers/common.c
+++ b/RpiLedBars/backend/src/drivers/common.c
@@ -0,0 +1,56 @@
+#include "common.h"
+
+#include <fcntl.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/mman.h>
+#include <unistd.h>
+
+#include "log.h"
+
+// Use mmap to obtain virtual address, given physical
+void *map_periph(MEM_MAP *mp, void *phys, int size) {
+  mp->phys = phys;
+  mp->size = PAGE_ROUNDUP(size);
+  mp->bus = (void *)((uint32_t)phys - PHYS_REG_BASE + BUS_REG_BASE);
+  mp->virt = map_segment(phys, mp->size);
+  return (mp->virt);
+}
+
+// Free mapped peripheral or memory
+void unmap_periph_mem(MEM_MAP *mp) {
+  if (mp) {
+    unmap_segment(mp->virt, mp->size);
+  }
+}
+
+// ----- VIRTUAL MEMORY -----
+
+// Get virtual memory segment for peripheral regs or physical mem
+void *map_segment(void *addr, int size) {
+  int fd;
+  void *mem;
+
+  size = PAGE_ROUNDUP(size);
+  if ((fd = open("/dev/mem", O_RDWR | O_SYNC | O_CLOEXEC)) < 0) {
+    log_fatal("can't open /dev/mem, run using sudo");
+    exit(-EXIT_FAILURE);
+  }
+
+  mem = mmap(0, size, PROT_WRITE | PROT_READ, MAP_SHARED, fd, (uint32_t)addr);
+  close(fd);
+  log_info("Map %p -> %p", (void *)addr, mem);
+  if (mem == MAP_FAILED) {
+    log_fatal("can't map memory");
+    exit(-EXIT_FAILURE);
+  }
+  return (mem);
+}
+
+// Free mapped memory
+void unmap_segment(void *mem, int size) {
+  if (mem) {
+    munmap(mem, PAGE_ROUNDUP(size));
+  }
+}
--- a/RpiLedBars/backend/src/drivers/common.h
+++ b/RpiLedBars/backend/src/drivers/common.h
@@ -0,0 +1,50 @@
+#if !defined(__COMMON_H__)
+#define __COMMON_H__
+
+// Location of peripheral registers in physical memory
+#define PHYS_REG_BASE PI_23_REG_BASE
+#define PI_01_REG_BASE 0x20000000 // Pi Zero or 1
+#define PI_23_REG_BASE 0x3F000000 // Pi 2 or 3
+#define PI_4_REG_BASE 0xFE000000  // Pi 4
+
+#define CLOCK_HZ 250000000 // Pi 2 - 4
+//#define CLOCK_HZ        400000000   // Pi Zero
+
+// Location of peripheral registers in bus memory
+#define BUS_REG_BASE 0x7E000000
+
+// Get virtual 8 and 32-bit pointers to register
+#define REG8(m, x) ((volatile uint8_t *)((uint32_t)(m.virt) + (uint32_t)(x)))
+#define REG32(m, x) ((volatile uint32_t *)((uint32_t)(m.virt) + (uint32_t)(x)))
+// Get bus address of register
+#define REG_BUS_ADDR(m, x) ((uint32_t)(m.bus) + (uint32_t)(x))
+// Convert uncached memory virtual address to bus address
+#define MEM_BUS_ADDR(mp, a) ((uint32_t)a - (uint32_t)mp->virt + (uint32_t)mp->bus)
+// Convert bus address to physical address (for mmap)
+#define BUS_PHYS_ADDR(a) ((void *)((uint32_t)(a) & ~0xC0000000))
+
+// Size of memory page
+#define PAGE_SIZE 0x1000
+// Round up to nearest page
+#define PAGE_ROUNDUP(n) ((n) % PAGE_SIZE == 0 ? (n) : ((n) + PAGE_SIZE) & ~(PAGE_SIZE - 1))
+
+// Structure for mapped peripheral or memory
+typedef struct {
+  int fd,    // File descriptor
+      h,     // Memory handle
+      size;  // Memory size
+  void *bus, // Bus address
+      *virt, // Virtual address
+      *phys; // Physical address
+} MEM_MAP;
+
+// Use mmap to obtain virtual address, given physical
+void *map_periph(MEM_MAP *mp, void *phys, int size);
+
+// Free mapped peripheral or memory
+void unmap_periph_mem(MEM_MAP *mp);
+
+void *map_segment(void *addr, int size);
+void unmap_segment(void *addr, int size);
+
+#endif // __COMMON_H__
--- a/RpiLedBars/backend/src/drivers/dma/rpi_dma.c
+++ b/RpiLedBars/backend/src/drivers/dma/rpi_dma.c
@@ -0,0 +1,90 @@
+#include "rpi_dma.h"
+
+#include <stdio.h>
+
+#include "rpi_videocore.h"
+
+// DMA channels and data requests
+#define DMA_SMI_DREQ 4
+#define DMA_PWM_DREQ 5
+#define DMA_SPI_TX_DREQ 6
+#define DMA_SPI_RX_DREQ 7
+#define DMA_BASE (PHYS_REG_BASE + 0x007000)
+// DMA register addresses offset by 0x100 * chan_num
+#define DMA_CS 0x00
+#define DMA_CONBLK_AD 0x04
+#define DMA_TI 0x08
+#define DMA_SRCE_AD 0x0c
+#define DMA_DEST_AD 0x10
+#define DMA_TXFR_LEN 0x14
+#define DMA_STRIDE 0x18
+#define DMA_NEXTCONBK 0x1c
+#define DMA_DEBUG 0x20
+#define DMA_REG(ch, r) ((r) == DMA_ENABLE ? DMA_ENABLE : (ch)*0x100 + (r))
+#define DMA_ENABLE 0xff0
+// DMA register values
+#define DMA_WAIT_RESP (1 << 3)
+#define DMA_CB_DEST_INC (1 << 4)
+#define DMA_DEST_DREQ (1 << 6)
+#define DMA_CB_SRCE_INC (1 << 8)
+#define DMA_SRCE_DREQ (1 << 10)
+#define DMA_PRIORITY(n) ((n) << 16)
+
+// Virtual memory pointers to acceess GPIO, DMA and PWM from user space
+MEM_MAP dma_regs;
+
+char *dma_regstrs[] = {"DMA CS",  "CB_AD",  "TI",      "SRCE_AD", "DEST_AD",
+                       "TFR_LEN", "STRIDE", "NEXT_CB", "DEBUG",   ""};
+
+void dma_setup(MEM_MAP *mp, int chan, int nsamp, uint8_t **txdata, int offset, uint32_t dest_ad) {
+  map_periph(&dma_regs, (void *)DMA_BASE, PAGE_SIZE);
+
+  DMA_CB *cbs = mp->virt;
+
+  *txdata = (uint8_t *)(cbs + offset);
+  enable_dma(chan);
+  cbs[0].ti = DMA_DEST_DREQ | (DMA_SMI_DREQ << 16) | DMA_CB_SRCE_INC | DMA_WAIT_RESP;
+  cbs[0].tfr_len = nsamp;
+  cbs[0].srce_ad = MEM_BUS_ADDR(mp, *txdata);
+  cbs[0].dest_ad = dest_ad;
+}
+
+void dma_close() { unmap_periph_mem(&dma_regs); }
+
+// Enable and reset DMA
+void enable_dma(int chan) {
+  *REG32(dma_regs, DMA_ENABLE) |= (1 << chan);
+  *REG32(dma_regs, DMA_REG(chan, DMA_CS)) = 1 << 31;
+}
+
+// Start DMA, given first control block
+void start_dma(MEM_MAP *mp, int chan, DMA_CB *cbp, uint32_t csval) {
+  *REG32(dma_regs, DMA_REG(chan, DMA_CONBLK_AD)) = MEM_BUS_ADDR(mp, cbp);
+  *REG32(dma_regs, DMA_REG(chan, DMA_CS)) = 2;         // Clear 'end' flag
+  *REG32(dma_regs, DMA_REG(chan, DMA_DEBUG)) = 7;      // Clear error bits
+  *REG32(dma_regs, DMA_REG(chan, DMA_CS)) = 1 | csval; // Start DMA
+}
+
+// Return remaining transfer length
+uint32_t dma_transfer_len(int chan) { return (*REG32(dma_regs, DMA_REG(chan, DMA_TXFR_LEN))); }
+
+// Check if DMA is active
+uint32_t dma_active(int chan) { return ((*REG32(dma_regs, DMA_REG(chan, DMA_CS))) & 1); }
+
+// Halt current DMA operation by resetting controller
+void stop_dma(int chan) {
+  if (dma_regs.virt)
+    *REG32(dma_regs, DMA_REG(chan, DMA_CS)) = 1 << 31;
+}
+
+// Display DMA registers
+void disp_dma(int chan) {
+  volatile uint32_t *p = REG32(dma_regs, DMA_REG(chan, DMA_CS));
+  int i = 0;
+
+  while (dma_regstrs[i][0]) {
+    printf("%-7s %08X ", dma_regstrs[i++], *p++);
+    if (i % 5 == 0 || dma_regstrs[i][0] == 0)
+      printf("\n");
+  }
+}
--- a/RpiLedBars/backend/src/drivers/dma/rpi_dma.h
+++ b/RpiLedBars/backend/src/drivers/dma/rpi_dma.h
@@ -0,0 +1,33 @@
+#if !defined(__RPI_DMA_H__)
+#define __RPI_DMA_H__
+
+#include <stdint.h>
+
+#include "../common.h"
+
+#define DMA_CHAN_A 10
+#define DMA_CHAN_B 11
+
+// DMA control block (must be 32-byte aligned)
+typedef struct {
+  uint32_t ti, // Transfer info
+      srce_ad, // Source address
+      dest_ad, // Destination address
+      tfr_len, // Transfer length
+      stride,  // Transfer stride
+      next_cb, // Next control block
+      debug,   // Debug register, zero in control block
+      unused;
+} DMA_CB __attribute__((aligned(32)));
+
+void dma_setup(MEM_MAP *mp, int chan, int nsamp, uint8_t **txdata, int offset, uint32_t dest_ad);
+void dma_close();
+
+void enable_dma(int chan);
+void start_dma(MEM_MAP *mp, int chan, DMA_CB *cbp, uint32_t csval);
+uint32_t dma_transfer_len(int chan);
+uint32_t dma_active(int chan);
+void stop_dma(int chan);
+void disp_dma(int chan);
+
+#endif // __RPI_DMA_H__
--- a/RpiLedBars/backend/src/drivers/dma/rpi_videocore.c
+++ b/RpiLedBars/backend/src/drivers/dma/rpi_videocore.c
@@ -0,0 +1,128 @@
+#include "rpi_videocore.h"
+
+#include <fcntl.h>
+#include <stdio.h>
+#include <sys/ioctl.h>
+#include <unistd.h>
+
+#include "log.h"
+
+// Mailbox command/response structure
+typedef struct {
+  uint32_t len,           // Overall length (bytes)
+      req,                // Zero for request, 1<<31 for response
+      tag,                // Command number
+      blen,               // Buffer length (bytes)
+      dlen;               // Data length (bytes)
+  uint32_t uints[32 - 5]; // Data (108 bytes maximum)
+} VC_MSG __attribute__((aligned(16)));
+
+void disp_vc_msg(VC_MSG *msgp);
+
+int open_mbox(void);
+void close_mbox(int fd);
+uint32_t msg_mbox(int fd, VC_MSG *msgp);
+void *map_uncached_mem(MEM_MAP *mp, int size);
+
+void videocore_setup(MEM_MAP *mp, int size) { map_uncached_mem(mp, size); }
+void videocore_close(MEM_MAP *mp) {
+  unmap_periph_mem(mp);
+  if (mp->fd) {
+    unlock_vc_mem(mp->fd, mp->h);
+    free_vc_mem(mp->fd, mp->h);
+    close_mbox(mp->fd);
+  }
+}
+
+// Allocate uncached memory, get bus & phys addresses
+void *map_uncached_mem(MEM_MAP *mp, int size) {
+  void *ret;
+  mp->size = PAGE_ROUNDUP(size);
+  mp->fd = open_mbox();
+  ret = (mp->h = alloc_vc_mem(mp->fd, mp->size, DMA_MEM_FLAGS)) > 0 &&
+                (mp->bus = lock_vc_mem(mp->fd, mp->h)) != 0 &&
+                (mp->virt = map_segment(BUS_PHYS_ADDR(mp->bus), mp->size)) != 0
+            ? mp->virt
+            : 0;
+  log_info("VC mem handle %u, phys %p, virt %p", mp->h, mp->bus, mp->virt);
+  return (ret);
+}
+
+// Allocate memory on PAGE_SIZE boundary, return handle
+uint32_t alloc_vc_mem(int fd, uint32_t size, VC_ALLOC_FLAGS flags) {
+  VC_MSG msg = {
+      .tag = 0x3000c, .blen = 12, .dlen = 12, .uints = {PAGE_ROUNDUP(size), PAGE_SIZE, flags}};
+  return (msg_mbox(fd, &msg));
+}
+// Lock allocated memory, return bus address
+void *lock_vc_mem(int fd, int h) {
+  VC_MSG msg = {.tag = 0x3000d, .blen = 4, .dlen = 4, .uints = {h}};
+  return (h ? (void *)msg_mbox(fd, &msg) : 0);
+}
+// Unlock allocated memory
+uint32_t unlock_vc_mem(int fd, int h) {
+  VC_MSG msg = {.tag = 0x3000e, .blen = 4, .dlen = 4, .uints = {h}};
+  return (h ? msg_mbox(fd, &msg) : 0);
+}
+// Free memory
+uint32_t free_vc_mem(int fd, int h) {
+  VC_MSG msg = {.tag = 0x3000f, .blen = 4, .dlen = 4, .uints = {h}};
+  return (h ? msg_mbox(fd, &msg) : 0);
+}
+uint32_t set_vc_clock(int fd, int id, uint32_t freq) {
+  VC_MSG msg1 = {.tag = 0x38001, .blen = 8, .dlen = 8, .uints = {id, 1}};
+  VC_MSG msg2 = {.tag = 0x38002, .blen = 12, .dlen = 12, .uints = {id, freq, 0}};
+  msg_mbox(fd, &msg1);
+  disp_vc_msg(&msg1);
+  msg_mbox(fd, &msg2);
+  disp_vc_msg(&msg2);
+  return (0);
+}
+
+// Display mailbox message
+void disp_vc_msg(VC_MSG *msgp) {
+  int i;
+
+  printf("VC msg len=%X, req=%X, tag=%X, blen=%x, dlen=%x, data ", msgp->len, msgp->req, msgp->tag,
+         msgp->blen, msgp->dlen);
+  for (i = 0; i < msgp->blen / 4; i++)
+    printf("%08X ", msgp->uints[i]);
+  printf("\n");
+}
+
+// Open mailbox interface, return file descriptor
+int open_mbox(void) {
+  int fd;
+
+  if ((fd = open("/dev/vcio", 0)) < 0)
+    log_error("can't open VC mailbox");
+  return (fd);
+}
+// Close mailbox interface
+void close_mbox(int fd) {
+  if (fd >= 0)
+    close(fd);
+}
+
+// Send message to mailbox, return first response int, 0 if error
+uint32_t msg_mbox(int fd, VC_MSG *msgp) {
+  uint32_t ret = 0, i;
+
+  for (i = msgp->dlen / 4; i <= msgp->blen / 4; i += 4)
+    msgp->uints[i++] = 0;
+  msgp->len = (msgp->blen + 6) * 4;
+  msgp->req = 0;
+  if (ioctl(fd, _IOWR(100, 0, void *), msgp) < 0) {
+    log_error("VC IOCTL failed");
+  } else if ((msgp->req & 0x80000000) == 0) {
+    log_error("VC IOCTL error");
+  } else if (msgp->req == 0x80000001) {
+    log_error("VC IOCTL partial error");
+  } else {
+    ret = msgp->uints[0];
+  }
+#if DEBUG
+  disp_vc_msg(msgp);
+#endif
+  return (ret);
+}
--- a/RpiLedBars/backend/src/drivers/dma/rpi_videocore.h
+++ b/RpiLedBars/backend/src/drivers/dma/rpi_videocore.h
@@ -0,0 +1,33 @@
+#if !defined(__RPI_VIDEOCORE_H__)
+#define __RPI_VIDEOCORE_H__
+
+#include <stdint.h>
+
+#include "../common.h"
+
+// Videocore mailbox memory allocation flags, see:
+//     https://github.com/raspberrypi/firmware/wiki/Mailbox-property-interface
+typedef enum {
+  MEM_FLAG_DISCARDABLE = 1 << 0,    // can be resized to 0 at any time. Use for cached data
+  MEM_FLAG_NORMAL = 0 << 2,         // normal allocating alias. Don't use from ARM
+  MEM_FLAG_DIRECT = 1 << 2,         // 0xC alias uncached
+  MEM_FLAG_COHERENT = 2 << 2,       // 0x8 alias. Non-allocating in L2 but coherent
+  MEM_FLAG_ZERO = 1 << 4,           // initialise buffer to all zeros
+  MEM_FLAG_NO_INIT = 1 << 5,        // don't initialise (default is initialise to all ones)
+  MEM_FLAG_HINT_PERMALOCK = 1 << 6, // Likely to be locked for long periods of time
+  MEM_FLAG_L1_NONALLOCATING = (MEM_FLAG_DIRECT | MEM_FLAG_COHERENT) // Allocating in L2
+} VC_ALLOC_FLAGS;
+
+// VC flags for unchached DMA memory
+#define DMA_MEM_FLAGS (MEM_FLAG_DIRECT | MEM_FLAG_ZERO)
+
+void videocore_setup(MEM_MAP *mp, int size);
+void videocore_close(MEM_MAP *mp);
+
+uint32_t alloc_vc_mem(int fd, uint32_t size, VC_ALLOC_FLAGS flags);
+void *lock_vc_mem(int fd, int h);
+uint32_t unlock_vc_mem(int fd, int h);
+uint32_t free_vc_mem(int fd, int h);
+uint32_t set_vc_clock(int fd, int id, uint32_t freq);
+
+#endif // __RPI_VIDEOCORE_H__
--- a/RpiLedBars/backend/src/drivers/gpio/rpi_gpio.c
+++ b/RpiLedBars/backend/src/drivers/gpio/rpi_gpio.c
@@ -0,0 +1,88 @@
+#include "rpi_gpio.h"
+
+#include <stdbool.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <unistd.h>
+
+#include "../common.h"
+
+// GPIO register definitions
+#define GPIO_BASE (PHYS_REG_BASE + 0x200000)
+#define GPIO_MODE0 0x00
+#define GPIO_SET0 0x1c
+#define GPIO_CLR0 0x28
+#define GPIO_LEV0 0x34
+#define GPIO_GPPUD 0x94
+#define GPIO_GPPUDCLK0 0x98
+
+#define GPIO_MODE_STRS "IN", "OUT", "ALT5", "ALT4", "ALT0", "ALT1", "ALT2", "ALT3"
+
+bool isInitialized = false;
+
+// Virtual memory pointers to acceess GPIO, DMA and PWM from user space
+MEM_MAP gpio_regs;
+
+char *gpio_mode_strs[] = {GPIO_MODE_STRS};
+
+// definitions
+
+void gpio_setup() {
+  if (!isInitialized) {
+    map_periph(&gpio_regs, (void *)GPIO_BASE, PAGE_SIZE);
+    isInitialized = true;
+  }
+}
+
+void gpio_close() {
+  if (isInitialized) {
+    unmap_periph_mem(&gpio_regs);
+    isInitialized = true;
+  }
+}
+
+// Set input or output with pullups
+void gpio_set(int pin, int mode, int pull) {
+  gpio_mode(pin, mode);
+  gpio_pull(pin, pull);
+}
+// Set I/P pullup or pulldown
+void gpio_pull(int pin, int pull) {
+  volatile uint32_t *reg = REG32(gpio_regs, GPIO_GPPUDCLK0) + pin / 32;
+
+  *REG32(gpio_regs, GPIO_GPPUD) = pull;
+  usleep(2);
+  *reg = pin << (pin % 32);
+  usleep(2);
+  *REG32(gpio_regs, GPIO_GPPUD) = 0;
+  *reg = 0;
+}
+
+// Set input or output
+void gpio_mode(int pin, int mode) {
+  if (gpio_regs.virt) {
+    volatile uint32_t *reg = REG32(gpio_regs, GPIO_MODE0) + pin / 10, shift = (pin % 10) * 3;
+    *reg = (*reg & ~(7 << shift)) | (mode << shift);
+  }
+}
+
+// Set an O/P pin
+void gpio_out(int pin, int val) {
+  volatile uint32_t *reg = REG32(gpio_regs, val ? GPIO_SET0 : GPIO_CLR0) + pin / 32;
+  *reg = 1 << (pin % 32);
+}
+
+// Get an I/P pin value
+uint8_t gpio_in(int pin) {
+  volatile uint32_t *reg = REG32(gpio_regs, GPIO_LEV0) + pin / 32;
+  return (((*reg) >> (pin % 32)) & 1);
+}
+
+// Display the values in a GPIO mode register
+void disp_mode_vals(uint32_t mode) {
+  int i;
+
+  for (i = 0; i < 10; i++)
+    printf("%u:%-4s ", i, gpio_mode_strs[(mode >> (i * 3)) & 7]);
+  printf("\n");
+}
--- a/RpiLedBars/backend/src/drivers/gpio/rpi_gpio.h
+++ b/RpiLedBars/backend/src/drivers/gpio/rpi_gpio.h
@@ -0,0 +1,26 @@
+#if !defined(__RPI_GPIO_H__)
+#define __RPI_GPIO_H__
+
+// GPIO I/O definitions
+#define GPIO_IN 0
+#define GPIO_OUT 1
+#define GPIO_ALT0 4
+#define GPIO_ALT1 5
+#define GPIO_ALT2 6
+#define GPIO_ALT3 7
+#define GPIO_ALT4 3
+#define GPIO_ALT5 2
+
+#define GPIO_NOPULL 0
+#define GPIO_PULLDN 1
+#define GPIO_PULLUP 2
+
+void gpio_setup();
+
+void gpio_close();
+
+void gpio_pull(int pin, int pull);
+
+void gpio_mode(int pin, int mode);
+
+#endif // __RPI_GPIO_H__
--- a/RpiLedBars/backend/src/drivers/leddriver/rpi_leddriver.c
+++ b/RpiLedBars/backend/src/drivers/leddriver/rpi_leddriver.c
@@ -0,0 +1,210 @@
+#include "rpi_leddriver.h"
+
+#include <stdio.h>
+#include <string.h>
+#include <unistd.h>
+
+#include "../../rpi_param.h"
+#include "../common.h"
+
+#include "../dma/rpi_dma.h"
+#include "../dma/rpi_videocore.h"
+#include "../gpio/rpi_gpio.h"
+#include "../smi/rpi_smi.h"
+
+#if PHYS_REG_BASE == PI_4_REG_BASE // Timings for RPi v4 (1.5 GHz)
+#define SMI_TIMING 10, 15, 30, 15  // 400 ns cycle time
+#else                              // Timings for RPi v0-3 (1 GHz)
+#define SMI_TIMING 10, 10, 20, 10  // 400 ns cycle time
+#endif
+
+#define TX_TEST 0      // If non-zero, use dummy Tx data
+#define LED_NBITS 24   // Number of data bits per LED
+#define LED_PREBITS 4  // Number of zero bits before LED data
+#define LED_POSTBITS 4 // Number of zero bits after LED data
+#define BIT_NPULSES 3  // Number of O/P pulses per LED bit
+
+// Length of data for 1 row (1 LED on each channel)
+#define LED_DLEN (LED_NBITS * BIT_NPULSES)
+
+// Transmit data type, 8 or 16 bits
+#if LED_NCHANS > 8
+#define TXDATA_T uint16_t
+#else
+#define TXDATA_T uint8_t
+#endif
+
+// Ofset into Tx data buffer, given LED number in chan
+#define LED_TX_OSET(n) (LED_PREBITS + (LED_DLEN * (n)))
+
+// Size of data buffers & NV memory, given number of LEDs per chan
+#define TX_BUFF_LEN(n) (LED_TX_OSET(n) + LED_POSTBITS)
+#define TX_BUFF_SIZE(n) (TX_BUFF_LEN(n) * sizeof(TXDATA_T))
+#define VC_MEM_SIZE (PAGE_SIZE + TX_BUFF_SIZE(CHAN_MAXLEDS))
+
+/* Global */
+MEM_MAP vc_mem;
+TXDATA_T *txdata;
+TXDATA_T tx_buffer[TX_BUFF_LEN(CHAN_MAXLEDS)];
+
+void swap_bytes();
+
+void leddriver_setup() {
+  videocore_setup(&vc_mem, VC_MEM_SIZE);
+  gpio_setup();
+  smi_setup(LED_NCHANS, SMI_TIMING, &vc_mem, TX_BUFF_LEN(CHAN_MAXLEDS), &txdata);
+}
+
+void leddriver_close() {
+  videocore_close(&vc_mem);
+  smi_close(LED_NCHANS);
+  gpio_close();
+}
+
+void set_color(uint32_t rgb, int index) {
+  int msk;
+  TXDATA_T *txd = &(tx_buffer[LED_TX_OSET(index)]);
+
+  // For each bit of the 24-bit RGB values..
+  for (size_t n = 0; n < LED_NBITS; n++) {
+    // Mask to convert RGB to GRB, M.S bit first
+    msk = n == 0 ? 0x800000 : n == 8 ? 0x8000 : n == 16 ? 0x80 : msk >> 1;
+    // 1st byte or word is a high pulse on all lines
+    txd[0] = (TXDATA_T)0xffff;
+    // 2nd has high or low bits from data
+    // 3rd is a low pulse
+    txd[1] = txd[2] = 0;
+    if (rgb & msk) {
+      txd[1] = (TXDATA_T)0xffff;
+    }
+    txd += BIT_NPULSES;
+  }
+}
+
+// Set Tx data for 8 or 16 chans, 1 LED per chan, given 1 RGB val per chan
+// Logic 1 is 0.8us high, 0.4 us low, logic 0 is 0.4us high, 0.8us low
+void rgb_txdata(int *rgbs, int index) {
+  int i, n, msk;
+  TXDATA_T *txd = &(tx_buffer[LED_TX_OSET(index)]);
+
+  // For each bit of the 24-bit RGB values..
+  for (n = 0; n < LED_NBITS; n++) {
+    // Mask to convert RGB to GRB, M.S bit first
+    msk = n == 0 ? 0x800000 : n == 8 ? 0x8000 : n == 16 ? 0x80 : msk >> 1;
+    // 1st byte or word is a high pulse on all lines
+    txd[0] = (TXDATA_T)0xffff;
+    // 2nd has high or low bits from data
+    // 3rd is a low pulse
+    txd[1] = txd[2] = 0;
+    for (i = 0; i < LED_NCHANS; i++) {
+      if (rgbs[i] & msk)
+        txd[1] |= (1 << i);
+    }
+    txd += BIT_NPULSES;
+  }
+}
+
+void leddriver_refresh() {
+#if LED_NCHANS <= 8
+  swap_bytes();
+#endif
+
+  while (dma_active(DMA_CHAN_A)) {
+    usleep(10);
+  }
+
+  memcpy(txdata, tx_buffer, TX_BUFF_SIZE(CHAN_MAXLEDS));
+  enable_dma(DMA_CHAN_A);
+  start_smi(&vc_mem);
+  usleep(10);
+}
+
+// Swap adjacent bytes in transmit data
+void swap_bytes() {
+  uint16_t *wp = (uint16_t *)tx_buffer;
+  int len = TX_BUFF_SIZE(CHAN_MAXLEDS);
+
+  len = (len + 1) / 2;
+  while (len-- > 0) {
+    *wp = __builtin_bswap16(*wp);
+    wp++;
+  }
+}
+
+/* source :
+ * https://github.com/adafruit/Adafruit_NeoPixel/blob/216ccdbff399750f5b02d4cc804c598399e39713/Adafruit_NeoPixel.cpp#L2414
+ */
+uint32_t ColorHSV(uint16_t hue, uint8_t sat, uint8_t val) {
+
+  uint8_t r, g, b;
+
+  // Remap 0-65535 to 0-1529. Pure red is CENTERED on the 64K rollover;
+  // 0 is not the start of pure red, but the midpoint...a few values above
+  // zero and a few below 65536 all yield pure red (similarly, 32768 is the
+  // midpoint, not start, of pure cyan). The 8-bit RGB hexcone (256 values
+  // each for red, green, blue) really only allows for 1530 distinct hues
+  // (not 1536, more on that below), but the full unsigned 16-bit type was
+  // chosen for hue so that one's code can easily handle a contiguous color
+  // wheel by allowing hue to roll over in either direction.
+  hue = (hue * 1530L + 32768) / 65536;
+  // Because red is centered on the rollover point (the +32768 above,
+  // essentially a fixed-point +0.5), the above actually yields 0 to 1530,
+  // where 0 and 1530 would yield the same thing. Rather than apply a
+  // costly modulo operator, 1530 is handled as a special case below.
+
+  // So you'd think that the color "hexcone" (the thing that ramps from
+  // pure red, to pure yellow, to pure green and so forth back to red,
+  // yielding six slices), and with each color component having 256
+  // possible values (0-255), might have 1536 possible items (6*256),
+  // but in reality there's 1530. This is because the last element in
+  // each 256-element slice is equal to the first element of the next
+  // slice, and keeping those in there this would create small
+  // discontinuities in the color wheel. So the last element of each
+  // slice is dropped...we regard only elements 0-254, with item 255
+  // being picked up as element 0 of the next slice. Like this:
+  // Red to not-quite-pure-yellow is:        255,   0, 0 to 255, 254,   0
+  // Pure yellow to not-quite-pure-green is: 255, 255, 0 to   1, 255,   0
+  // Pure green to not-quite-pure-cyan is:     0, 255, 0 to   0, 255, 254
+  // and so forth. Hence, 1530 distinct hues (0 to 1529), and hence why
+  // the constants below are not the multiples of 256 you might expect.
+
+  // Convert hue to R,G,B (nested ifs faster than divide+mod+switch):
+  if (hue < 510) { // Red to Green-1
+    b = 0;
+    if (hue < 255) { //   Red to Yellow-1
+      r = 255;
+      g = hue;       //     g = 0 to 254
+    } else {         //   Yellow to Green-1
+      r = 510 - hue; //     r = 255 to 1
+      g = 255;
+    }
+  } else if (hue < 1020) { // Green to Blue-1
+    r = 0;
+    if (hue < 765) { //   Green to Cyan-1
+      g = 255;
+      b = hue - 510;  //     b = 0 to 254
+    } else {          //   Cyan to Blue-1
+      g = 1020 - hue; //     g = 255 to 1
+      b = 255;
+    }
+  } else if (hue < 1530) { // Blue to Red-1
+    g = 0;
+    if (hue < 1275) { //   Blue to Magenta-1
+      r = hue - 1020; //     r = 0 to 254
+      b = 255;
+    } else { //   Magenta to Red-1
+      r = 255;
+      b = 1530 - hue; //     b = 255 to 1
+    }
+  } else { // Last 0.5 Red (quicker than % operator)
+    r = 255;
+    g = b = 0;
+  }
+
+  // Apply saturation and value to R,G,B, pack into 32-bit result:
+  uint32_t v1 = 1 + val;  // 1 to 256; allows >>8 instead of /255
+  uint16_t s1 = 1 + sat;  // 1 to 256; same reason
+  uint8_t s2 = 255 - sat; // 255 to 0
+  return ((((((r * s1) >> 8) + s2) * v1) & 0xff00) << 8) |
+         (((((g * s1) >> 8) + s2) * v1) & 0xff00) | (((((b * s1) >> 8) + s2) * v1) >> 8);
+}
--- a/RpiLedBars/backend/src/drivers/leddriver/rpi_leddriver.h
+++ b/RpiLedBars/backend/src/drivers/leddriver/rpi_leddriver.h
@@ -0,0 +1,18 @@
+#if !defined(__RPI_LEDDRIVER_H__)
+#define __RPI_LEDDRIVER_H__
+
+#include <stdint.h>
+
+void leddriver_setup();
+
+void leddriver_close();
+
+void set_color(uint32_t rgb, int index);
+
+void rgb_txdata(int *rgbs, int index);
+
+void leddriver_refresh();
+
+uint32_t ColorHSV(uint16_t hue, uint8_t sat, uint8_t val);
+
+#endif // __RPI_LEDDRIVER_H__
--- a/RpiLedBars/backend/src/drivers/selector/rpi_selector.c
+++ b/RpiLedBars/backend/src/drivers/selector/rpi_selector.c
@@ -0,0 +1,65 @@
+/** @file rpi_selector.c
+ *  @brief This module is used to manage selector on gpio
+ */
+
+/***************************************************************************************************
+ * Includes
+ **************************************************************************************************/
+#include "rpi_selector.h"
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <wiringPi.h>
+
+/***************************************************************************************************
+ * Preprocessor Constants and Macros
+ **************************************************************************************************/
+
+/***************************************************************************************************
+ * Type and Contant Definitions
+ **************************************************************************************************/
+unsigned const selectorPinNumber = 4;
+/* TODO use GPIO function from ../gpio/gipo.h (same pin number) */
+int selectorPins[4] = {26, 27, 6, 5};
+char modeStr[] = "0 | 0 | 0 | 0 \n";
+
+/***************************************************************************************************
+ * Persistent Variables
+ **************************************************************************************************/
+
+/***************************************************************************************************
+ * Internal Function Prototypes
+ **************************************************************************************************/
+
+/***************************************************************************************************
+ * External Function Definitions
+ **************************************************************************************************/
+void selector_setup() {
+  wiringPiSetupGpio();
+
+  for (size_t i = 0; i < selectorPinNumber; ++i) {
+    pinMode(selectorPins[i], INPUT);
+    pullUpDnControl(selectorPins[i], PUD_DOWN);
+  }
+}
+
+int selector_get_position() {
+  int newPosition = -1;
+  for (size_t i = 0; i < selectorPinNumber; ++i) {
+    if (digitalRead(selectorPins[i])) {
+      newPosition = i;
+    }
+  }
+  return newPosition;
+}
+
+char *selector_tostr() {
+  for (size_t i = 0; i < selectorPinNumber; ++i) {
+    modeStr[i * 4] = digitalRead(selectorPins[i]) ? '1' : '0';
+  }
+  return modeStr;
+}
+
+/***************************************************************************************************
+ * Internal Function Definitions
+ **************************************************************************************************/
--- a/RpiLedBars/backend/src/drivers/selector/rpi_selector.h
+++ b/RpiLedBars/backend/src/drivers/selector/rpi_selector.h
@@ -0,0 +1,42 @@
+/** @file rpi_selector.h
+ *  @brief This module is used to manage selector on gpio
+ */
+#if !defined(__RPI_SELECTOR_H__)
+#define __RPI_SELECTOR_H__
+
+/***************************************************************************************************
+ * Includes
+ **************************************************************************************************/
+#include <stdbool.h>
+
+/***************************************************************************************************
+ * Preprocessor Constants and Macros
+ **************************************************************************************************/
+
+/***************************************************************************************************
+ * Type and Contant Definitions
+ **************************************************************************************************/
+
+/***************************************************************************************************
+ * Global Variables
+ **************************************************************************************************/
+
+/***************************************************************************************************
+ * External Function Prototypes
+ **************************************************************************************************/
+/**
+ * @brief setup the selector module
+ **/
+void selector_setup();
+
+/**
+ * @brief get the selector position
+ **/
+int selector_get_position();
+
+/**
+ * @brief Get string with selector debug info
+ **/
+char *selector_tostr();
+
+#endif /* __RPI_SELECTOR_H__ */
--- a/RpiLedBars/backend/src/drivers/smi/rpi_smi.c
+++ b/RpiLedBars/backend/src/drivers/smi/rpi_smi.c
@@ -0,0 +1,223 @@
+#include "rpi_smi.h"
+
+#include <unistd.h>
+
+#include "../dma/rpi_dma.h"
+#include "../gpio/rpi_gpio.h"
+
+// GPIO first pin
+#define SMI_SD0_PIN 8
+
+// Data widths
+#define SMI_8_BITS 0
+#define SMI_16_BITS 1
+#define SMI_18_BITS 2
+#define SMI_9_BITS 3
+
+// Clock registers and values
+#define CLK_BASE (PHYS_REG_BASE + 0x101000)
+// #define CLK_PWM_CTL 0xa0
+// #define CLK_PWM_DIV 0xa4
+#define CLK_SMI_CTL 0xb0
+#define CLK_SMI_DIV 0xb4
+#define CLK_PASSWD 0x5a000000
+#define PWM_CLOCK_ID 0xa
+
+// DMA request threshold
+#define REQUEST_THRESH 2
+
+// Register definitions
+#define SMI_BASE (PHYS_REG_BASE + 0x600000)
+#define SMI_CS 0x00   // Control & status
+#define SMI_L 0x04    // Transfer length
+#define SMI_A 0x08    // Address
+#define SMI_D 0x0c    // Data
+#define SMI_DSR0 0x10 // Read settings device 0
+#define SMI_DSW0 0x14 // Write settings device 0
+#define SMI_DSR1 0x18 // Read settings device 1
+#define SMI_DSW1 0x1c // Write settings device 1
+#define SMI_DSR2 0x20 // Read settings device 2
+#define SMI_DSW2 0x24 // Write settings device 2
+#define SMI_DSR3 0x28 // Read settings device 3
+#define SMI_DSW3 0x2c // Write settings device 3
+#define SMI_DMC 0x30  // DMA control
+#define SMI_DCS 0x34  // Direct control/status
+#define SMI_DCA 0x38  // Direct address
+#define SMI_DCD 0x3c  // Direct data
+#define SMI_FD 0x40   // FIFO debug
+#define SMI_REGLEN (SMI_FD * 4)
+
+// Union of 32-bit value with register bitfields
+#define REG_DEF(name, fields)                                                                      \
+  typedef union {                                                                                  \
+    struct {                                                                                       \
+      volatile uint32_t fields;                                                                    \
+    };                                                                                             \
+    volatile uint32_t value;                                                                       \
+  } name
+
+// Control and status register
+#define SMI_CS_FIELDS                                                                              \
+  enable:                                                                                          \
+  1, done : 1, active : 1, start : 1, clear : 1, write : 1, _x1 : 2, teen : 1, intd : 1, intt : 1, \
+      intr : 1, pvmode : 1, seterr : 1, pxldat : 1, edreq : 1, _x2 : 8, _x3 : 1, aferr : 1,        \
+      txw : 1, rxr : 1, txd : 1, rxd : 1, txe : 1, rxf : 1
+REG_DEF(SMI_CS_REG, SMI_CS_FIELDS);
+
+// Data length register
+#define SMI_L_FIELDS                                                                               \
+  len:                                                                                             \
+  32
+REG_DEF(SMI_L_REG, SMI_L_FIELDS);
+
+// Address & device number
+#define SMI_A_FIELDS                                                                               \
+  addr:                                                                                            \
+  6, _x1 : 2, dev : 2
+REG_DEF(SMI_A_REG, SMI_A_FIELDS);
+
+// Data FIFO
+#define SMI_D_FIELDS                                                                               \
+  data:                                                                                            \
+  32
+REG_DEF(SMI_D_REG, SMI_D_FIELDS);
+
+// DMA control register
+#define SMI_DMC_FIELDS                                                                             \
+  reqw:                                                                                            \
+  6, reqr : 6, panicw : 6, panicr : 6, dmap : 1, _x1 : 3, dmaen : 1
+REG_DEF(SMI_DMC_REG, SMI_DMC_FIELDS);
+
+// Device settings: read (1 of 4)
+#define SMI_DSR_FIELDS                                                                             \
+  rstrobe:                                                                                         \
+  7, rdreq : 1, rpace : 7, rpaceall : 1, rhold : 6, fsetup : 1, mode68 : 1, rsetup : 6, rwidth : 2
+REG_DEF(SMI_DSR_REG, SMI_DSR_FIELDS);
+
+// Device settings: write (1 of 4)
+#define SMI_DSW_FIELDS                                                                             \
+  wstrobe:                                                                                         \
+  7, wdreq : 1, wpace : 7, wpaceall : 1, whold : 6, wswap : 1, wformat : 1, wsetup : 6, wwidth : 2
+REG_DEF(SMI_DSW_REG, SMI_DSW_FIELDS);
+
+// Direct control register
+#define SMI_DCS_FIELDS                                                                             \
+  enable:                                                                                          \
+  1, start : 1, done : 1, write : 1
+REG_DEF(SMI_DCS_REG, SMI_DCS_FIELDS);
+
+// Direct control address & device number
+#define SMI_DCA_FIELDS                                                                             \
+  addr:                                                                                            \
+  6, _x1 : 2, dev : 2
+REG_DEF(SMI_DCA_REG, SMI_DCA_FIELDS);
+
+// Direct control data
+#define SMI_DCD_FIELDS                                                                             \
+  data:                                                                                            \
+  32
+REG_DEF(SMI_DCD_REG, SMI_DCD_FIELDS);
+
+// Debug register
+#define SMI_FLVL_FIELDS                                                                            \
+  fcnt:                                                                                            \
+  6, _x1 : 2, flvl : 6
+REG_DEF(SMI_FLVL_REG, SMI_FLVL_FIELDS);
+
+// Pointers to SMI registers
+volatile SMI_CS_REG *smi_cs;
+volatile SMI_L_REG *smi_l;
+volatile SMI_A_REG *smi_a;
+volatile SMI_D_REG *smi_d;
+volatile SMI_DMC_REG *smi_dmc;
+volatile SMI_DSR_REG *smi_dsr;
+volatile SMI_DSW_REG *smi_dsw;
+volatile SMI_DCS_REG *smi_dcs;
+volatile SMI_DCA_REG *smi_dca;
+volatile SMI_DCD_REG *smi_dcd;
+
+MEM_MAP smi_regs, clk_regs;
+
+void setup_smi_dma(MEM_MAP *mp, int nsamp, uint8_t **txdata, int len);
+
+void smi_setup(int channels, int ns, int setup, int strobe, int hold, MEM_MAP *mp, int nsamp,
+               uint8_t **txdata) {
+  map_periph(&smi_regs, (void *)SMI_BASE, PAGE_SIZE);
+  map_periph(&clk_regs, (void *)CLK_BASE, PAGE_SIZE);
+
+  int width = channels > 8 ? SMI_16_BITS : SMI_8_BITS;
+  int i, divi = ns / 2;
+
+  smi_cs = (SMI_CS_REG *)REG32(smi_regs, SMI_CS);
+  smi_l = (SMI_L_REG *)REG32(smi_regs, SMI_L);
+  smi_a = (SMI_A_REG *)REG32(smi_regs, SMI_A);
+  smi_d = (SMI_D_REG *)REG32(smi_regs, SMI_D);
+  smi_dmc = (SMI_DMC_REG *)REG32(smi_regs, SMI_DMC);
+  smi_dsr = (SMI_DSR_REG *)REG32(smi_regs, SMI_DSR0);
+  smi_dsw = (SMI_DSW_REG *)REG32(smi_regs, SMI_DSW0);
+  smi_dcs = (SMI_DCS_REG *)REG32(smi_regs, SMI_DCS);
+  smi_dca = (SMI_DCA_REG *)REG32(smi_regs, SMI_DCA);
+  smi_dcd = (SMI_DCD_REG *)REG32(smi_regs, SMI_DCD);
+  smi_cs->value = smi_l->value = smi_a->value = 0;
+  smi_dsr->value = smi_dsw->value = smi_dcs->value = smi_dca->value = 0;
+  if (*REG32(clk_regs, CLK_SMI_DIV) != divi << 12) {
+    *REG32(clk_regs, CLK_SMI_CTL) = CLK_PASSWD | (1 << 5);
+    usleep(10);
+    while (*REG32(clk_regs, CLK_SMI_CTL) & (1 << 7))
+      ;
+    usleep(10);
+    *REG32(clk_regs, CLK_SMI_DIV) = CLK_PASSWD | (divi << 12);
+    usleep(10);
+    *REG32(clk_regs, CLK_SMI_CTL) = CLK_PASSWD | 6 | (1 << 4);
+    usleep(10);
+    while ((*REG32(clk_regs, CLK_SMI_CTL) & (1 << 7)) == 0)
+      ;
+    usleep(100);
+  }
+  if (smi_cs->seterr)
+    smi_cs->seterr = 1;
+  smi_dsr->rsetup = smi_dsw->wsetup = setup;
+  smi_dsr->rstrobe = smi_dsw->wstrobe = strobe;
+  smi_dsr->rhold = smi_dsw->whold = hold;
+  smi_dmc->panicr = smi_dmc->panicw = 8;
+  smi_dmc->reqr = smi_dmc->reqw = REQUEST_THRESH;
+  smi_dsr->rwidth = smi_dsw->wwidth = width;
+  for (i = 0; i < channels; i++)
+    gpio_mode(SMI_SD0_PIN + i, GPIO_ALT1);
+
+  setup_smi_dma(mp, nsamp, txdata, width + 1);
+}
+
+void smi_close(int channels) {
+  for (size_t i = 0; i < channels; ++i)
+    gpio_mode(SMI_SD0_PIN + i, GPIO_IN);
+  if (smi_regs.virt) {
+    *REG32(smi_regs, SMI_CS) = 0;
+  }
+  stop_dma(DMA_CHAN_A);
+  unmap_periph_mem(&clk_regs);
+  unmap_periph_mem(&smi_regs);
+  dma_close();
+}
+
+// Start SMI DMA transfers
+void start_smi(MEM_MAP *mp) {
+  DMA_CB *cbs = mp->virt;
+
+  start_dma(mp, DMA_CHAN_A, &cbs[0], 0);
+  smi_cs->start = 1;
+}
+
+// private
+
+// Set up SMI transfers using DMA
+void setup_smi_dma(MEM_MAP *mp, int nsamp, uint8_t **txdata, int len) {
+  smi_dmc->dmaen = 1;
+  smi_cs->enable = 1;
+  smi_cs->clear = 1;
+  smi_cs->pxldat = 1;
+  smi_l->len = nsamp * len;
+  smi_cs->write = 1;
+
+  dma_setup(mp, DMA_CHAN_A, nsamp, txdata, len, REG_BUS_ADDR(smi_regs, SMI_D));
+}
--- a/RpiLedBars/backend/src/drivers/smi/rpi_smi.h
+++ b/RpiLedBars/backend/src/drivers/smi/rpi_smi.h
@@ -0,0 +1,14 @@
+#if !defined(__RPI_SMI_H__)
+#define __RPI_SMI_H__
+
+#include "../common.h"
+#include <stdint.h>
+
+void smi_setup(int channels, int ns, int setup, int strobe, int hold, MEM_MAP *mp, int nsamp,
+               uint8_t **txdata);
+
+void smi_close(int channels);
+
+void start_smi(MEM_MAP *mp);
+
+#endif // __RPI_SMI_H__
--- a/RpiLedBars/backend/src/main.c
+++ b/RpiLedBars/backend/src/main.c
@@ -0,0 +1,371 @@
+/** @file main.c
+ *  @brief This is the main exectution program
+ */
+
+/***************************************************************************************************
+ * Includes
+ **************************************************************************************************/
+#include <ctype.h>
+#include <errno.h>
+#include <pthread.h>
+#include <signal.h>
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <time.h>
+#include <unistd.h>
+
+#include "log.h"
+
+#include "drivers/leddriver/rpi_leddriver.h"
+
+#include "artnet.h"
+#include "cava.h"
+#include "selector.h"
+#include "websocket.h"
+
+#include "rpi_midi_controller.h"
+#include "rpi_param.h"
+#include "rpi_pattern.h"
+
+/***************************************************************************************************
+ * Preprocessor Constants and Macros
+ **************************************************************************************************/
+
+/***************************************************************************************************
+ * Type and Contant Definitions
+ **************************************************************************************************/
+
+/***************************************************************************************************
+ * Persistent Variables
+ **************************************************************************************************/
+/*  Command-line parameters */
+bool IsTestMode = false;
+int logLevel = 2;
+
+int previousMode = -1;
+
+unsigned long mainLoopCycle = 0;
+
+pthread_mutex_t logLockMutex = PTHREAD_MUTEX_INITIALIZER;
+
+/***************************************************************************************************
+ * Internal Function Prototypes
+ **************************************************************************************************/
+
+void parseCommandLineArgs(int argc, char const *argv[]);
+
+void terminate(int sig);
+
+void manage_tasks(int previousMode, int currentMode);
+
+void execute_task(int mode);
+
+void execute_test_mode();
+
+void execute_artnet_mode();
+
+void execute_autonomous_mode();
+
+void execute_manual_mode();
+
+void adjust_loop(struct timespec const *loopStart);
+
+void log_lock_helper(bool lock, void *udata);
+
+/***************************************************************************************************
+ * External Function Definitions
+ **************************************************************************************************/
+
+int main(int argc, char const *argv[]) {
+  // setup
+  signal(SIGINT, terminate);
+
+  struct sched_param sp;
+  sp.sched_priority = 32;
+  if (pthread_setschedparam(pthread_self(), SCHED_FIFO, &sp)) {
+    fprintf(stderr, "WARNING: Failed to set stepper thread to real-time priority: %s\n",
+            strerror(errno));
+  }
+
+  log_set_lock(log_lock_helper, &logLockMutex);
+
+  param_setup();
+  midi_controller_setup();
+  leddriver_setup();
+  websocket_start();
+  selector_start();
+
+  parseCommandLineArgs(argc, argv);
+
+  // loop
+  while (1) {
+    struct timespec loopStart;
+    int mode;
+
+    clock_gettime(CLOCK_MONOTONIC, &loopStart);
+    if (IsTestMode) {
+      if (mainLoopCycle % (180 * 3) < 180) {
+        mode = 0;
+      } else if (mainLoopCycle % (180 * 3) < 180 * 2) {
+        mode = 1;
+      } else {
+        mode = 2;
+      }
+    } else {
+      mode = param_access->pixled.mode;
+    }
+    /* todo thread ? */
+    midi_controller_execute();
+
+    if (mode != -1) {
+      if (mode != previousMode) {
+        log_info("swtching to mode : %d", mode);
+        manage_tasks(previousMode, mode);
+      } else {
+        execute_task(mode);
+      }
+      previousMode = mode;
+    }
+    adjust_loop(&loopStart);
+  }
+}
+
+/***************************************************************************************************
+ * Internal Function Definitions
+ **************************************************************************************************/
+
+void parseCommandLineArgs(int argc, char const *argv[]) {
+  int args = 0;
+
+  while (argc > ++args) // Process command-line args
+  {
+    if (argv[args][0] == '-') {
+      switch (toupper(argv[args][1])) {
+      case 'N': // -N: number of LEDs per channel
+        if (args >= argc - 1) {
+          log_error("no numeric value");
+          exit(-EXIT_FAILURE);
+        } else {
+          param_access->pixled.chanLedCount = atoi(argv[++args]);
+        }
+        break;
+      case 'D': // -D: debug level
+        if (args >= argc - 1) {
+          log_error("no debug level");
+          exit(-EXIT_FAILURE);
+        } else {
+          logLevel = atoi(argv[++args]);
+          log_set_level(logLevel);
+        }
+        break;
+      case 'T': // -T: test mode
+        IsTestMode = true;
+        break;
+      default: // Otherwise error
+        log_error("Unrecognised option '%c'\n", argv[args][1]);
+        fprintf(stderr, "Options:\n"
+                        "  -t        Test mode (flash LEDs)\n"
+                        "  -n num    number of LEDs per channel\n"
+                        "  -d lvl    debug level\n");
+        exit(-EXIT_FAILURE);
+      }
+    }
+  }
+}
+
+void terminate(int sig) {
+  manage_tasks(previousMode, -1);
+  leddriver_close();
+  log_info("Goodbye !");
+  exit(EXIT_SUCCESS);
+}
+
+void manage_tasks(int previousMode, int currentMode) {
+  /* stop previous bg task */
+  switch (previousMode) {
+  case 1:
+    artnet_stop();
+    break;
+  case 2:
+  case 3:
+    cava_stop();
+    break;
+  default:
+    break;
+  }
+
+  /* start new bg task */
+  switch (currentMode) {
+  case 1:
+    artnet_start();
+    break;
+  case 2:
+  case 3:
+    cava_start();
+    break;
+  default:
+    break;
+  }
+}
+
+void execute_task(int mode) {
+  switch (mode) {
+  case 0:
+    // mode test
+    execute_test_mode();
+    break;
+  case 1:
+    // artnet mode
+    execute_artnet_mode();
+    break;
+  case 2:
+    execute_autonomous_mode();
+    break;
+  case 3:
+    // manual mode
+    execute_manual_mode();
+    break;
+
+  default:
+    break;
+  }
+}
+
+// Pointer to uncached Tx data buffer
+// TXDATA_T tx_buffer[TX_BUFF_LEN(CHAN_MAXLEDS)]; // Tx buffer for assembling data
+
+void execute_test_mode() {
+  // RGB values for test mode (1 value for each of 16 channels)
+  uint32_t on_rgbs[] = {0x5f0000, 0x005f00, 0x00005f, 0x5f5f00, 0x5f005f, 0x005f5f, 0x5f5f5f};
+  uint32_t off_rgbs = 0x000000;
+
+  static int i = 0, offset = 0;
+
+  for (size_t ledIndex = 0; ledIndex < param_access->pixled.chanLedCount; ++ledIndex) {
+    set_color(ledIndex <= offset % param_access->pixled.chanLedCount ? on_rgbs[i] * .5 : off_rgbs,
+              ledIndex);
+  }
+
+  leddriver_refresh();
+
+  if (offset < param_access->pixled.chanLedCount) {
+    ++offset;
+  } else {
+    offset = 0;
+    if (i < 7) {
+      ++i;
+    } else {
+      i = 0;
+    }
+  }
+}
+
+// RGB data
+int rgb_data[CHAN_MAXLEDS][LED_NCHANS];
+
+void execute_artnet_mode() {
+  uint8_t *dmxData;
+
+  for (size_t ledBar = 0; ledBar < LED_NCHANS; ledBar++) {
+    if (artnet_get_dmx_data(ledBar, &dmxData) == 0) {
+      for (size_t i = 0; i < param_access->pixled.chanLedCount; ++i) {
+        uint8_t *rgb = dmxData + (i * 3);
+        rgb_data[i][ledBar] = (rgb[0] << 16) | (rgb[1] << 8) | rgb[2];
+        rgb_txdata(rgb_data[i], i);
+      }
+    }
+  }
+
+  leddriver_refresh();
+}
+
+void execute_autonomous_mode() {
+  int ret;
+  uint16_t *buffer;
+
+  if ((ret = cava_get_buffer(&buffer)) == 0) {
+    switch (param_access->auton.pattern) {
+    case 0:
+      bounce_led_and_color(buffer, CAVA_BAR_NUMBER);
+      break;
+    case 1:
+      bounce_led(buffer, CAVA_BAR_NUMBER);
+      break;
+    case 2:
+      bounce_led_and_travel(buffer, CAVA_BAR_NUMBER);
+      break;
+
+    default:
+      break;
+    }
+  }
+}
+
+unsigned baseLed[LED_NCHANS] = {0};
+
+void execute_manual_mode() {
+  int ret;
+  uint16_t *buffer;
+
+  if ((ret = cava_get_buffer(&buffer)) == 0) {
+    for (size_t ledBarIndex = 0; ledBarIndex < LED_NCHANS; ++ledBarIndex) {
+      uint16_t barMax = 0;
+      // uint16_t hueInterval = UINT16_MAX - (param_access->ledbar[ledBarIndex].hueInterval -
+      //                                      param_access->ledbar[ledBarIndex].hueBase);
+      for (size_t cavaBar = 0; cavaBar < CAVA_BAR_NUMBER / LED_NCHANS; ++cavaBar) {
+        unsigned barIndex = ledBarIndex * CAVA_BAR_NUMBER / LED_NCHANS + cavaBar;
+        if (barMax < buffer[barIndex]) {
+          barMax = buffer[barIndex];
+        }
+      }
+      barMax *= param_access->auton.sensitivity * param_access->ledbar[ledBarIndex].sensitivity;
+      unsigned ledToLight = barMax * param_access->pixled.chanLedCount / 2 / UINT16_MAX;
+      unsigned long hueShift =
+          (long)barMax * (long)param_access->ledbar[ledBarIndex].hueInterval / UINT16_MAX;
+      uint16_t hue = param_access->ledbar[ledBarIndex].hueBase - hueShift;
+      uint32_t color = ColorHSV(hue, 255, param_access->ledbar[ledBarIndex].luminosity);
+
+      for (size_t i = 0; i < ledToLight; ++i) {
+        rgb_data[i][ledBarIndex] = color;
+        rgb_txdata(rgb_data[i], i);
+      }
+      for (size_t i = ledToLight; i < param_access->pixled.chanLedCount; ++i) {
+        rgb_data[i][ledBarIndex] = 0x000000;
+        rgb_txdata(rgb_data[i], i);
+      }
+    }
+
+    leddriver_refresh();
+  }
+}
+
+void adjust_loop(struct timespec const *loopStart) {
+  struct timespec loopEnd;
+  long elapsedTimeUs, remainingTimeUs;
+
+  clock_gettime(CLOCK_MONOTONIC, &loopEnd);
+  elapsedTimeUs = (loopEnd.tv_nsec - loopStart->tv_nsec) / 1E3 +
+                  ((unsigned)(loopEnd.tv_sec - loopStart->tv_sec)) * 1E6;
+  remainingTimeUs = 16000 - elapsedTimeUs;
+
+  if (remainingTimeUs >= 0) {
+    log_trace("cycle %lu, loop remaining time %ld", mainLoopCycle, remainingTimeUs);
+    usleep(remainingTimeUs);
+  } else {
+    log_warn("loop overlap by %06ldus", -remainingTimeUs);
+    log_info("loop start %ld.%09lds - loop end %ld.%09lds", loopStart->tv_sec, loopStart->tv_nsec,
+             loopEnd.tv_sec, loopEnd.tv_nsec);
+  }
+  ++mainLoopCycle;
+}
+
+void log_lock_helper(bool lock, void *udata) {
+  pthread_mutex_t *pLogLockMutex = (pthread_mutex_t *)(udata);
+  if (lock) {
+    pthread_mutex_lock(pLogLockMutex);
+  } else {
+    pthread_mutex_unlock(pLogLockMutex);
+  }
+}
--- a/RpiLedBars/backend/src/rpi_midi_controller.c
+++ b/RpiLedBars/backend/src/rpi_midi_controller.c
@@ -0,0 +1,240 @@
+/** @file .c
+ *  @brief This module
+ */
+
+/***************************************************************************************************
+ * Includes
+ **************************************************************************************************/
+
+#include "rpi_midi_controller.h"
+
+#include <alsa/asoundlib.h>
+
+#include "log.h"
+
+#include "rpi_param.h"
+
+/***************************************************************************************************
+ * Preprocessor Constants and Macros
+ **************************************************************************************************/
+
+#define C3 48
+#define Gd3 56
+
+/***************************************************************************************************
+ * Type and Contant Definitions
+ **************************************************************************************************/
+
+/***************************************************************************************************
+ * Persistent Variables
+ **************************************************************************************************/
+
+/**
+ * Boolean for interrupting the main thread loop
+ */
+static snd_seq_t *seq_handle;
+
+/**
+ * Boolean for interrupting the main thread loop
+ */
+static int sys_port;
+
+/**
+ * Boolean for interrupting the main thread loop
+ */
+static int in_port;
+
+/* state machine */
+int destChannel = 0xf;
+
+/***************************************************************************************************
+ * Internal Function Prototypes
+ **************************************************************************************************/
+
+/**
+ * @brief
+ */
+void subscribe_system_port();
+
+/**
+ * @brief
+ *
+ * @param   controller
+ */
+void subscribe_midi_controller(snd_seq_addr_t controller);
+
+/**
+ * @brief
+ *
+ * @param   ev
+ */
+void handle_system_port_events(snd_seq_event_t *ev);
+
+/**
+ * @brief
+ *
+ * @param   ev
+ */
+void handle_in_port_events(snd_seq_event_t *ev);
+
+/***************************************************************************************************
+ * External Function Definitions
+ **************************************************************************************************/
+
+void midi_controller_setup() {
+  if (snd_seq_open(&seq_handle, "default", SND_SEQ_OPEN_INPUT, SND_SEQ_NONBLOCK) != 0) {
+    SNDERR("snd_seq_open");
+  }
+
+  if (snd_seq_set_client_name(seq_handle, "Midi Listener") != 0) {
+    SNDERR("snd_seq_set_client_name");
+  }
+
+  sys_port = snd_seq_create_simple_port(seq_handle, "sys:in",
+                                        SND_SEQ_PORT_CAP_WRITE | SND_SEQ_PORT_CAP_SUBS_WRITE,
+                                        SND_SEQ_PORT_TYPE_APPLICATION);
+
+  if (sys_port < 0) {
+    SNDERR("snd_seq_create_simple_port");
+  }
+
+  subscribe_system_port();
+
+  in_port = snd_seq_create_simple_port(seq_handle, "listen:in",
+                                       SND_SEQ_PORT_CAP_WRITE | SND_SEQ_PORT_CAP_SUBS_WRITE,
+                                       SND_SEQ_PORT_TYPE_APPLICATION);
+
+  if (in_port < 0) {
+    SNDERR("snd_seq_create_simple_port");
+  }
+
+  snd_seq_addr_t controller = {.client = 24, .port = 0};
+  subscribe_midi_controller(controller);
+}
+
+void midi_controller_execute() {
+  snd_seq_event_t *ev = NULL;
+  int ret;
+  while ((ret = snd_seq_event_input(seq_handle, &ev)) > 0) {
+    if (ev->dest.port == sys_port) {
+      handle_system_port_events(ev);
+    } else if (ev->dest.port == in_port) {
+      handle_in_port_events(ev);
+    } else {
+      log_warn("Unkonwn midi dest port %d", ev->dest.port);
+    }
+  }
+  if (ret < 0 && ret != -EAGAIN) {
+    SNDERR("snd_seq_event_input");
+  }
+}
+
+void midi_controller_close() {}
+
+/***************************************************************************************************
+ * Internal Function Definitions
+ **************************************************************************************************/
+
+void subscribe_system_port() {
+  snd_seq_addr_t sender = {.client = 0, .port = SND_SEQ_PORT_SYSTEM_ANNOUNCE};
+  snd_seq_connect_from(seq_handle, sys_port, sender.client, sender.port);
+}
+
+void subscribe_midi_controller(snd_seq_addr_t controller) {
+  snd_seq_connect_from(seq_handle, in_port, controller.client, controller.port);
+}
+
+void handle_system_port_events(snd_seq_event_t *ev) {
+  if (ev->type == SND_SEQ_EVENT_PORT_START) {
+    snd_seq_addr_t *newport = (snd_seq_addr_t *)&ev->data;
+    if (newport->client != snd_seq_client_id(seq_handle)) {
+      log_info("New port %d:%d", newport->client, newport->port);
+      subscribe_midi_controller(*newport);
+    }
+  }
+}
+
+void handle_in_port_events(snd_seq_event_t *ev) {
+  switch (ev->type) {
+  case SND_SEQ_EVENT_PGMCHANGE:
+    if (ev->data.control.value < LED_NCHANS) {
+      if (ev->data.control.value != destChannel) {
+        destChannel = ev->data.control.value;
+        log_info("Control param channel %d", ev->data.control.value);
+      }
+    } else if (destChannel != GLOBAL_CHANNEL) {
+      log_info("Control global param");
+      destChannel = GLOBAL_CHANNEL;
+    }
+    break;
+
+  case SND_SEQ_EVENT_NOTEON:
+    if (ev->data.note.note == C3) {
+      if (destChannel != GLOBAL_CHANNEL) {
+        destChannel = GLOBAL_CHANNEL;
+        log_info("Control global param");
+      }
+    } else if (ev->data.note.note >= Gd3) {
+      set_pattern(ev->data.note.note - Gd3);
+    } else {
+      log_debug("NOTEON : ch %#04x - note %d - vel %d", ev->data.note.channel, ev->data.note.note,
+                ev->data.note.velocity);
+    }
+    break;
+
+  case SND_SEQ_EVENT_NOTEOFF:
+    break;
+
+  case SND_SEQ_EVENT_CONTROLLER:
+    switch (ev->data.control.param) {
+    /* Pots */
+    case 1:
+      set_sensitivity(destChannel, ev->data.control.value);
+      break;
+    case 2:
+      set_luminosity(destChannel, ev->data.control.value);
+      break;
+    case 3:
+      set_hue_base(destChannel, ev->data.control.value);
+      break;
+    case 4:
+      set_hue_interval(destChannel, ev->data.control.value);
+      break;
+    case 5:
+      set_gravity(ev->data.control.value);
+      break;
+    case 6:
+      set_saturation(destChannel, ev->data.control.value);
+      break;
+    case 7:
+      set_hue_auto_shift_interval(destChannel, ev->data.control.value);
+      break;
+    case 8:
+      set_hue_auto_shift_speed(destChannel, ev->data.control.value);
+      break;
+
+    /* Pads in CC */
+    case 26:
+      set_hue_auto_shift(ev->data.control.value != 0);
+      break;
+
+    default:
+      log_debug("CONTROLLER : ch %#04x - param %u - value %d", ev->data.control.channel,
+                ev->data.control.param, ev->data.control.value);
+      break;
+    }
+    break;
+
+  default:
+    log_debug("ev %02d : %#010x - %#010x - %#010x", ev->type, ev->data.raw32.d[0],
+              ev->data.raw32.d[1], ev->data.raw32.d[2]);
+    break;
+  }
+  if (ev->type == SND_SEQ_EVENT_PORT_START) {
+    snd_seq_addr_t *newport = (snd_seq_addr_t *)&ev->data;
+    if (newport->client != snd_seq_client_id(seq_handle)) {
+      log_debug("New port %d:%d", newport->client, newport->port);
+      subscribe_midi_controller(*newport);
+    }
+  }
+}
--- a/RpiLedBars/backend/src/rpi_midi_controller.h
+++ b/RpiLedBars/backend/src/rpi_midi_controller.h
@@ -0,0 +1,42 @@
+/** @file .h
+ *  @brief This module
+ */
+#if !defined(__RPI_MIDI_CONTROLLER_H__)
+#define __RPI_MIDI_CONTROLLER_H__
+
+/***************************************************************************************************
+ * Includes
+ **************************************************************************************************/
+
+/***************************************************************************************************
+ * Preprocessor Constants and Macros
+ **************************************************************************************************/
+
+/***************************************************************************************************
+ * Type and Contant Definitions
+ **************************************************************************************************/
+
+/***************************************************************************************************
+ * Global Variables
+ **************************************************************************************************/
+
+/***************************************************************************************************
+ * External Function Prototypes
+ **************************************************************************************************/
+
+/**
+ * @brief
+ */
+void midi_controller_setup();
+
+/**
+ * @brief
+ */
+void midi_controller_execute();
+
+/**
+ * @brief
+ */
+void midi_controller_close();
+
+#endif /* __RPI_MIDI_CONTROLLER_H__ */
--- a/RpiLedBars/backend/src/rpi_param.c
+++ b/RpiLedBars/backend/src/rpi_param.c
@@ -0,0 +1,202 @@
+/** @file .c
+ *  @brief This module
+ */
+
+/***************************************************************************************************
+ * Includes
+ **************************************************************************************************/
+
+#include "rpi_param.h"
+
+#include <math.h>
+#include <pthread.h>
+#include <stdlib.h>
+
+#include "log.h"
+
+#include "drivers/selector/rpi_selector.h"
+#include "websocket.h"
+
+/***************************************************************************************************
+ * Preprocessor Constants and Macros
+ **************************************************************************************************/
+
+/***************************************************************************************************
+ * Type and Contant Definitions
+ **************************************************************************************************/
+
+pixled_param_t const dummyPixledParam = {.mode = 0, .chanLedCount = 0};
+auton_param_t const dummyAutonParam = {
+    .sensitivity = 10, .gravity = 80, .pattern = 0, .isHueAutoShiftEnabled = true};
+ledbar_param_t const dummyLedbarParam = {.sensitivity = 1.,
+                                         .hueBase = 121,
+                                         .hueInterval = -100,
+                                         .hueAutoShift = 0,
+                                         .hueAutoShiftInterval = 0,
+                                         .hueAutoShiftSpeed = 1.,
+                                         .isIncreasing = false,
+                                         .luminosity = 20,
+                                         .saturation = 180};
+
+/***************************************************************************************************
+ * Persistent Variables
+ **************************************************************************************************/
+
+param_t param;
+
+pthread_mutex_t paramLockMutex = PTHREAD_MUTEX_INITIALIZER;
+
+/***************************************************************************************************
+ * Internal Function Prototypes
+ **************************************************************************************************/
+
+/***************************************************************************************************
+ * External Function Definitions
+ **************************************************************************************************/
+
+void param_setup() {
+  param.pixled = dummyPixledParam;
+  param.auton = dummyAutonParam;
+  for (size_t i = 0; i < LED_NCHANS; ++i) {
+    param.ledbar[i] = dummyLedbarParam;
+  }
+  param_access = &param;
+}
+
+void set_mode(unsigned int mode) {
+  if (mode != param.pixled.mode) {
+    pthread_mutex_lock(&paramLockMutex);
+    param.pixled.mode = mode;
+    log_debug("Mode : %d", mode);
+    websocket_send_mode(mode);
+    pthread_mutex_unlock(&paramLockMutex);
+  }
+}
+
+void set_pattern(unsigned int pattern) {
+  if (pattern != param.auton.pattern) {
+    pthread_mutex_lock(&paramLockMutex);
+    param.auton.pattern = pattern;
+    log_debug("Pattern : %d", pattern);
+    pthread_mutex_unlock(&paramLockMutex);
+  }
+}
+
+void set_gravity(int8_t gravity8) {
+  param.auton.gravity = gravity8 * 100 / INT8_MAX;
+  log_debug("Gravity : %d", param.auton.gravity);
+}
+
+void set_hue_auto_shift(bool HasToBeEnabled) {
+  if (HasToBeEnabled != param.auton.isHueAutoShiftEnabled) {
+    param.auton.isHueAutoShiftEnabled = HasToBeEnabled;
+    log_debug("Hue auto shift : %s", HasToBeEnabled ? "Enabled" : "Disabled");
+    if (!HasToBeEnabled) {
+      for (size_t i = 0; i < LED_NCHANS; ++i) {
+        param.ledbar[i].hueAutoShift = 0;
+      }
+    }
+  }
+}
+
+void set_sensitivity(int channel, int8_t sensitivity8) {
+  float sensitivity = pow(1.065, sensitivity8 - INT8_MAX / 2);
+  if (channel >= LED_NCHANS) {
+    param.auton.sensitivity = sensitivity;
+  } else {
+    param.ledbar[channel].sensitivity = sensitivity;
+  }
+  log_debug("Sensitivity : %f", sensitivity);
+}
+
+void set_hue_base(int channel, int8_t hueBase8) {
+  uint16_t hueBase = hueBase8 * HUEBASE_MAX / INT8_MAX;
+  if (channel < LED_NCHANS) {
+    param.ledbar[channel].hueBase = hueBase;
+  } else {
+    for (size_t i = 0; i < LED_NCHANS; ++i) {
+      param.ledbar[i].hueBase = hueBase;
+    }
+  }
+  log_debug("Hue base : %u", hueBase);
+}
+
+void set_hue_interval(int channel, int8_t hueInterval8) {
+  int16_t hueInterval = hueInterval8 - ((INT8_MAX + 1) / 2);
+  if (-30 <= hueInterval && hueInterval <= 30) {
+    hueInterval = hueInterval * (HUEINTERVAL_MAX + 1) / 30;
+  } else if (hueInterval <= -30) {
+    hueInterval = 22 * (hueInterval + 30) - HUEINTERVAL_MAX;
+  } else {
+    hueInterval = 22 * (hueInterval - 30) + HUEINTERVAL_MAX;
+  }
+
+  if (channel < LED_NCHANS) {
+    param.ledbar[channel].hueInterval = hueInterval;
+  } else {
+    for (size_t i = 0; i < LED_NCHANS; ++i) {
+      param.ledbar[i].hueInterval = hueInterval;
+    }
+  }
+  log_debug("Hue interval [%2d] : %d", channel, hueInterval);
+}
+
+void set_hue_auto_shift_interval(int channel, int8_t hueInterval8) {
+  int16_t hueInterval = hueInterval8 - ((INT8_MAX + 1) / 2);
+  if (-30 <= hueInterval && hueInterval <= 30) {
+    hueInterval = hueInterval * (HUEINTERVAL_MAX + 1) / 30;
+  } else if (hueInterval <= -30) {
+    hueInterval = 22 * (hueInterval + 30) - HUEINTERVAL_MAX;
+  } else {
+    hueInterval = 22 * (hueInterval - 30) + HUEINTERVAL_MAX;
+  }
+
+  if (channel < LED_NCHANS) {
+    param.ledbar[channel].hueAutoShiftInterval = hueInterval;
+  } else {
+    for (size_t i = 0; i < LED_NCHANS; ++i) {
+      param.ledbar[i].hueAutoShiftInterval = hueInterval;
+    }
+  }
+  log_debug("Hue auto shift interval [%2d] : %d", channel, hueInterval);
+}
+
+void set_hue_auto_shift_speed(int channel, int8_t hueSpeed8) {
+  float hueSpeed = pow(1.065, hueSpeed8 - INT8_MAX / 2);
+  if (channel < LED_NCHANS) {
+    param.ledbar[channel].hueAutoShiftSpeed = hueSpeed;
+  } else {
+    for (size_t i = 0; i < LED_NCHANS; ++i) {
+      param.ledbar[i].hueAutoShiftSpeed = hueSpeed;
+    }
+  }
+  log_debug("Hue auto shift speed [%2d] : %d", channel, hueSpeed);
+}
+
+void set_luminosity(int channel, int8_t luminosity8) {
+  uint8_t luminosity = luminosity8 * UINT8_MAX / INT8_MAX;
+  if (channel < LED_NCHANS) {
+    param.ledbar[channel].luminosity = luminosity;
+  } else {
+    for (size_t i = 0; i < LED_NCHANS; ++i) {
+      param.ledbar[i].luminosity = luminosity;
+    }
+  }
+  log_debug("Luminosity : %u", luminosity);
+}
+
+void set_saturation(int channel, int8_t saturation8) {
+  uint8_t saturation = saturation8 * UINT8_MAX / INT8_MAX;
+  if (channel < LED_NCHANS) {
+    param.ledbar[channel].saturation = saturation;
+  } else {
+    for (size_t i = 0; i < LED_NCHANS; ++i) {
+      param.ledbar[i].saturation = saturation;
+    }
+  }
+  log_debug("Saturation : %u", saturation);
+}
+
+/***************************************************************************************************
+ * Internal Function Definitions
+ **************************************************************************************************/
--- a/RpiLedBars/backend/src/rpi_param.h
+++ b/RpiLedBars/backend/src/rpi_param.h
@@ -0,0 +1,144 @@
+/** @file .h
+ *  @brief This module
+ */
+
+#if !defined(__RPI_PARAM_H__)
+#define __RPI_PARAM_H__
+
+/***************************************************************************************************
+ * Includes
+ **************************************************************************************************/
+
+#include <stdbool.h>
+#include <stdint.h>
+
+/***************************************************************************************************
+ * Preprocessor Constants and Macros
+ **************************************************************************************************/
+
+#define CHAN_MAXLEDS 60 // Maximum number of LEDs per channel
+#define LED_NCHANS 8    // Number of LED channels (8 or 16)
+
+#define GLOBAL_CHANNEL 15
+
+#define HUE_MAX 359
+#define HUEBASE_MIN 0
+#define HUEBASE_MAX HUE_MAX
+#define HUEINTERVAL_MIN -HUE_MAX
+#define HUEINTERVAL_MAX HUE_MAX
+#define LUMINOSITY_MIN 0
+#define LUMINOSITY_MAX 255
+#define SATURATION_MIN 0
+#define SATURATION_MAX 255
+
+/***************************************************************************************************
+ * Type and Contant Definitions
+ **************************************************************************************************/
+
+/**
+ *
+ */
+typedef struct {
+  int mode;
+  unsigned int chanLedCount;
+} pixled_param_t;
+
+/**
+ *
+ */
+typedef struct {
+  float sensitivity;
+  unsigned int gravity;
+  unsigned int pattern;
+  bool isHueAutoShiftEnabled;
+} auton_param_t;
+
+/**
+ *
+ */
+typedef struct {
+  float sensitivity;
+  unsigned int hueBase;
+  int hueInterval;
+  unsigned int hueAutoShift;
+  int hueAutoShiftInterval;
+  float hueAutoShiftSpeed;
+  bool isIncreasing;
+  unsigned int luminosity;
+  unsigned int saturation;
+} ledbar_param_t;
+
+/**
+ *
+ */
+typedef struct {
+  pixled_param_t pixled;
+  auton_param_t auton;
+  ledbar_param_t ledbar[LED_NCHANS];
+} param_t;
+
+/***************************************************************************************************
+ * Global Variables
+ **************************************************************************************************/
+
+param_t *param_access;
+
+/***************************************************************************************************
+ * External Function Prototypes
+ **************************************************************************************************/
+
+/**
+ * @brief
+ */
+void param_setup();
+
+/**
+ * @brief
+ *
+ * @param[in] mode
+ */
+void set_mode(unsigned int mode);
+
+/**
+ * @brief
+ *
+ * @param[in] pattern
+ */
+void set_pattern(unsigned int pattern);
+
+/**
+ * @brief
+ *
+ * @param[in] HasToBeEnabled
+ */
+void set_hue_auto_shift(bool HasToBeEnabled);
+
+/**
+ * @brief
+ *
+ * @param[in] gravity8
+ */
+void set_gravity(int8_t gravity8);
+
+/**
+ * @brief
+ *
+ * @param[in] channel
+ *
+ * @param[in] sensitivity8
+ */
+void set_sensitivity(int channel, int8_t sensitivity8);
+
+void set_hue_base(int channel, int8_t hueBase8);
+
+void set_hue_interval(int channel, int8_t hueInterval8);
+
+void set_hue_auto_shift_interval(int channel, int8_t hueInterval8);
+
+void set_hue_auto_shift_speed(int channel, int8_t hueSpeed8);
+
+void set_luminosity(int channel, int8_t luminosity8);
+
+void set_saturation(int channel, int8_t saturation8);
+
+#endif /* __RPI_PARAM_H__ */
--- a/RpiLedBars/backend/src/rpi_pattern.c
+++ b/RpiLedBars/backend/src/rpi_pattern.c
@@ -0,0 +1,259 @@
+/** @file .c
+ *  @brief This module
+ */
+
+/***************************************************************************************************
+ * Includes
+ **************************************************************************************************/
+
+#include "rpi_pattern.h"
+
+#include <stdlib.h>
+
+#include "log.h"
+
+#include "drivers/leddriver/rpi_leddriver.h"
+#include "rpi_param.h"
+
+/***************************************************************************************************
+ * Preprocessor Constants and Macros
+ **************************************************************************************************/
+
+/***************************************************************************************************
+ * Type and Contant Definitions
+ **************************************************************************************************/
+
+/***************************************************************************************************
+ * Persistent Variables
+ **************************************************************************************************/
+
+/**
+ * Index to channel translattion
+ */
+int channelTranslation[LED_NCHANS] = {0, 1, 2, 3, 4, 6, 7, 5};
+
+/**
+ * RGB data buffer. Persistency is not needed but, as of it size, it must be declared in heap
+ */
+int rgbData[CHAN_MAXLEDS][LED_NCHANS];
+
+/**
+ * Number of led previously lighted per led bar
+ */
+int lightedLedCountArray[LED_NCHANS];
+
+/**
+ * Index of first previously lighted per led bar
+ */
+int baseLedIndexArray[LED_NCHANS];
+
+/***************************************************************************************************
+ * Internal Function Prototypes
+ **************************************************************************************************/
+
+uint16_t get_max_on_interval(uint16_t *array, unsigned int length, size_t intervalMin,
+                             size_t intervalSize);
+
+uint16_t apply_sensitivity(uint16_t value, unsigned int valueIndex);
+
+unsigned int get_led_to_light_count(uint16_t barValue, unsigned int barIndex);
+
+unsigned int get_first_led_to_light(unsigned int barIndex);
+
+uint32_t get_hsv_color(unsigned int barIndex, float shiftRatio);
+
+void increment_autoshift(unsigned int barIndex);
+
+/***************************************************************************************************
+ * External Function Definitions
+ **************************************************************************************************/
+
+void bounce_led_and_color(uint16_t *spectrumArray, unsigned int spectrumLength) {
+  for (size_t ledBarIndex = 0; ledBarIndex < LED_NCHANS; ++ledBarIndex) {
+    size_t intervalSize = spectrumLength / LED_NCHANS;
+    uint16_t barMax = 0;
+    unsigned int ledToLightCount = 0;
+
+    barMax = get_max_on_interval(spectrumArray, spectrumLength, ledBarIndex * intervalSize,
+                                 intervalSize);
+    barMax = apply_sensitivity(barMax, ledBarIndex);
+    ledToLightCount = get_led_to_light_count(barMax, ledBarIndex);
+
+    uint32_t color = get_hsv_color(ledBarIndex, (ledToLightCount - 1) /
+                                                    (float)param_access->pixled.chanLedCount);
+
+    for (size_t i = 0; i < ledToLightCount; ++i) {
+      rgbData[i][ledBarIndex] = color;
+      rgb_txdata(rgbData[i], i);
+    }
+    for (size_t i = ledToLightCount; i < param_access->pixled.chanLedCount; ++i) {
+      rgbData[i][ledBarIndex] = 0x000000;
+      rgb_txdata(rgbData[i], i);
+    }
+
+    increment_autoshift(ledBarIndex);
+  }
+  leddriver_refresh();
+}
+
+void bounce_led(uint16_t *spectrumArray, unsigned int spectrumLength) {
+  for (size_t ledBarIndex = 0; ledBarIndex < LED_NCHANS; ++ledBarIndex) {
+    size_t intervalSize = spectrumLength / LED_NCHANS;
+    uint16_t barMax = 0;
+    unsigned int ledToLightCount = 0;
+
+    barMax = get_max_on_interval(spectrumArray, spectrumLength, ledBarIndex * intervalSize,
+                                 intervalSize);
+    barMax = apply_sensitivity(barMax, ledBarIndex);
+    ledToLightCount = get_led_to_light_count(barMax, ledBarIndex);
+
+    for (size_t i = 0; i < ledToLightCount; ++i) {
+
+      uint32_t color = get_hsv_color(ledBarIndex, i / (float)param_access->pixled.chanLedCount);
+      rgbData[i][ledBarIndex] = color;
+      rgb_txdata(rgbData[i], i);
+    }
+    for (size_t i = ledToLightCount; i < param_access->pixled.chanLedCount; ++i) {
+      rgbData[i][ledBarIndex] = 0x000000;
+      rgb_txdata(rgbData[i], i);
+    }
+
+    increment_autoshift(ledBarIndex);
+  }
+
+  leddriver_refresh();
+}
+
+void bounce_led_and_travel(uint16_t *spectrumArray, unsigned int spectrumLength) {
+  for (size_t ledBarIndex = 0; ledBarIndex < LED_NCHANS; ++ledBarIndex) {
+    size_t intervalSize = spectrumLength / LED_NCHANS;
+    uint16_t barMax = 0;
+    unsigned int ledToLightCount = 0, firstLedToLight = get_first_led_to_light(ledBarIndex);
+    uint32_t color = 0;
+
+    barMax = get_max_on_interval(spectrumArray, spectrumLength, ledBarIndex * intervalSize,
+                                 intervalSize);
+    barMax = apply_sensitivity(barMax, ledBarIndex) / 4;
+    ledToLightCount = get_led_to_light_count(barMax, ledBarIndex) + 1;
+
+    if (!param_access->auton.isHueAutoShiftEnabled) {
+      color = get_hsv_color(ledBarIndex,
+                            (ledToLightCount - 1) * 4L / (float)param_access->pixled.chanLedCount);
+    }
+
+    for (size_t i = 0; i < ledToLightCount; ++i) {
+      unsigned int ledIndex = firstLedToLight + i;
+      ledIndex = ledIndex < param_access->pixled.chanLedCount
+                     ? ledIndex
+                     : ledIndex - param_access->pixled.chanLedCount;
+      if (param_access->auton.isHueAutoShiftEnabled) {
+        color = get_hsv_color(ledBarIndex, ledIndex / (float)param_access->pixled.chanLedCount);
+      }
+      rgbData[ledIndex][ledBarIndex] = color;
+      rgb_txdata(rgbData[ledIndex], ledIndex);
+    }
+    for (size_t i = ledToLightCount; i < param_access->pixled.chanLedCount; ++i) {
+      unsigned int ledIndex = firstLedToLight + i;
+      ledIndex = ledIndex < param_access->pixled.chanLedCount
+                     ? ledIndex
+                     : ledIndex - param_access->pixled.chanLedCount;
+      rgbData[ledIndex][ledBarIndex] = 0x000000;
+      rgb_txdata(rgbData[ledIndex], ledIndex);
+    }
+
+    increment_autoshift(ledBarIndex);
+  }
+
+  leddriver_refresh();
+}
+
+/***************************************************************************************************
+ * Internal Function Definitions
+ **************************************************************************************************/
+
+uint16_t get_max_on_interval(uint16_t *array, unsigned int length, size_t intervalMin,
+                             size_t intervalSize) {
+  uint16_t barMax = 0;
+  for (size_t i = 0; i < intervalSize; ++i) {
+    unsigned barIndex = intervalMin + i;
+    if (barMax < array[barIndex]) {
+      barMax = array[barIndex];
+    }
+  }
+  return barMax;
+}
+
+uint16_t apply_sensitivity(uint16_t value, unsigned int valueIndex) {
+  return value * param_access->auton.sensitivity * param_access->ledbar[valueIndex].sensitivity;
+}
+
+unsigned int get_led_to_light_count(uint16_t barValue, unsigned int barIndex) {
+  unsigned int nbLightedLed = lightedLedCountArray[barIndex];
+  unsigned int ledToLightCount = barValue * param_access->pixled.chanLedCount / UINT16_MAX;
+
+  if (ledToLightCount < nbLightedLed) {
+    /* apply gravity */
+    ledToLightCount = ((ledToLightCount * (100 - param_access->auton.gravity)) +
+                       (nbLightedLed * param_access->auton.gravity)) /
+                      100;
+  }
+  lightedLedCountArray[barIndex] = ledToLightCount;
+  return ledToLightCount;
+}
+
+unsigned int get_first_led_to_light(unsigned int barIndex) {
+  unsigned int firstLed = baseLedIndexArray[barIndex];
+  if (lightedLedCountArray[barIndex] != 0) {
+    firstLed += lightedLedCountArray[barIndex] / 4 + 1;
+    firstLed = firstLed < param_access->pixled.chanLedCount
+                   ? firstLed
+                   : firstLed - param_access->pixled.chanLedCount;
+  }
+  baseLedIndexArray[barIndex] = firstLed;
+  return firstLed;
+}
+
+uint32_t get_hsv_color(unsigned int barIndex, float shiftRatio) {
+  int hueShift = shiftRatio * param_access->ledbar[barIndex].hueInterval;
+  uint16_t hue = param_access->ledbar[barIndex].hueBase +
+                 (param_access->ledbar[barIndex].hueAutoShift) + hueShift;
+  // log_trace("hueAutoShift : %010x, hueShift : %d, hue %u",
+  //           param_access->ledbar[barIndex].hueAutoShift, hueShift, hue);
+  uint32_t color =
+      ColorHSV(hue * UINT16_MAX / HUEBASE_MAX, param_access->ledbar[barIndex].saturation,
+               param_access->ledbar[barIndex].luminosity);
+  return color;
+}
+
+void increment_autoshift(unsigned int barIndex) {
+  static float increment[LED_NCHANS];
+  if (param_access->auton.isHueAutoShiftEnabled) {
+    int const hueInterval = param_access->ledbar[barIndex].hueAutoShiftInterval;
+    int hueAutoShift = param_access->ledbar[barIndex].hueAutoShift;
+    if ((hueInterval > 0 && param_access->ledbar[barIndex].isIncreasing) ||
+        (hueInterval < 0 && !param_access->ledbar[barIndex].isIncreasing)) {
+      increment[barIndex] += param_access->ledbar[barIndex].hueAutoShiftSpeed;
+    } else if (hueInterval != 0) {
+      increment[barIndex] -= param_access->ledbar[barIndex].hueAutoShiftSpeed;
+    }
+
+    if (abs(increment[barIndex]) > 1) {
+      hueAutoShift += increment[barIndex];
+      increment[barIndex] = increment[barIndex] - (int)increment[barIndex];
+    }
+
+    if ((hueInterval > 0 && hueAutoShift < 0) || (hueInterval < 0 && hueAutoShift > 0)) {
+      hueAutoShift = -hueAutoShift;
+      param_access->ledbar[barIndex].isIncreasing = !param_access->ledbar[barIndex].isIncreasing;
+    } else if ((hueInterval > 0 && hueAutoShift > hueInterval) ||
+               (hueInterval < 0 && hueAutoShift < hueInterval)) {
+      hueAutoShift = hueInterval;
+      param_access->ledbar[barIndex].isIncreasing = !param_access->ledbar[barIndex].isIncreasing;
+    }
+    if (barIndex == 0) {
+      log_trace("hueInterval : %d, hueAutoShift : %d, increase : %s", hueInterval, hueAutoShift,
+                param_access->ledbar[barIndex].isIncreasing ? "yes" : "no");
+    }
+    param_access->ledbar[barIndex].hueAutoShift = hueAutoShift;
+  }
+}
--- a/RpiLedBars/backend/src/rpi_pattern.h
+++ b/RpiLedBars/backend/src/rpi_pattern.h
@@ -0,0 +1,57 @@
+/** @file .h
+ *  @brief This module
+ */
+
+#if !defined(__RPI_PATTERN_H__)
+#define __RPI_PATTERN_H__
+
+/***************************************************************************************************
+ * Includes
+ **************************************************************************************************/
+
+#include <stdint.h>
+
+/***************************************************************************************************
+ * Preprocessor Constants and Macros
+ **************************************************************************************************/
+
+/***************************************************************************************************
+ * Type and Contant Definitions
+ **************************************************************************************************/
+
+/***************************************************************************************************
+ * Global Variables
+ **************************************************************************************************/
+
+/***************************************************************************************************
+ * External Function Prototypes
+ **************************************************************************************************/
+
+/**
+ * @brief
+ *
+ * @param[in] spectrumArray array of value from spectral analysis
+ *
+ * @param[in] spectrumLength length of spectrum array
+ */
+void bounce_led_and_color(uint16_t *spectrumArray, unsigned int spectrumLength);
+
+/**
+ * @brief
+ *
+ * @param[in] spectrumArray array of value from spectral analysis
+ *
+ * @param[in] spectrumLength length of spectrum array
+ */
+void bounce_led(uint16_t *spectrumArray, unsigned int spectrumLength);
+
+/**
+ * @brief
+ *
+ * @param[in] spectrumArray array of value from spectral analysis
+ *
+ * @param[in] spectrumLength length of spectrum array
+ */
+void bounce_led_and_travel(uint16_t *spectrumArray, unsigned int spectrumLength);
+
+#endif /* __RPI_PATTERN_H__ */
--- a/RpiLedBars/backend/src/tasks/CMakeLists.txt
+++ b/RpiLedBars/backend/src/tasks/CMakeLists.txt
@@ -0,0 +1,11 @@
+# add the executable
+add_library(${PROJECT_NAME}_tasks
+    artnet/artnet.c
+    cava/cava.c
+    selector/selector.c
+    websocket/websocket.c)
+
+target_link_libraries(${PROJECT_NAME}_tasks PRIVATE pthread)
+target_link_libraries(${PROJECT_NAME}_tasks PRIVATE logc ws)
+
+target_include_directories(${PROJECT_NAME}_tasks PUBLIC includes)
--- a/RpiLedBars/backend/src/tasks/artnet/artnet.c
+++ b/RpiLedBars/backend/src/tasks/artnet/artnet.c
@@ -0,0 +1,198 @@
+/** @file rpi_artnet.c
+ *  @brief This module contains continuous tasks for artnet node communications.
+ *
+ * This is the implementation file.
+ */
+
+/***************************************************************************************************
+ * Includes
+ **************************************************************************************************/
+#include "artnet.h"
+
+#include <arpa/inet.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <poll.h>
+#include <pthread.h>
+#include <stdbool.h>
+#include <stdio.h>
+#include <string.h>
+#include <sys/socket.h>
+#include <unistd.h>
+
+#include "artnet_packets.h"
+#include "artnet_utils.h"
+#include "log.h"
+
+/***************************************************************************************************
+ * Preprocessor Constants and Macros
+ **************************************************************************************************/
+
+/***************************************************************************************************
+ * Type and Contant Definitions
+ **************************************************************************************************/
+
+/***************************************************************************************************
+ * Persistent Variables
+ **************************************************************************************************/
+
+/**
+ * Boolean for interrupting the main thread loop
+ */
+bool isUdpListenerRunning = false;
+/**
+ * Task thread identifier
+ */
+pthread_t udpListener;
+/**
+ * Buffer for storing artnet dmx data received
+ */
+uint8_t artDmxBufferArray[16][512];
+
+/***************************************************************************************************
+ * Internal Function Prototypes
+ **************************************************************************************************/
+
+/**
+ * @brief This function is used to thread main execution function
+ *
+ * @param   arg not used.
+ *
+ * @return  NULL.
+ */
+static void *artnet_udp_handler(void *arg);
+
+/**
+ * @brief This function is used to send an artnet poll reply packet
+ *
+ * @param[in]   fdUdpSocket The UDP socket file descriptor.
+ *
+ * @param[in]   senderAddr  The adress of poll emiter.
+ */
+static void artnet_send_poll_reply(int fdUdpSocket, struct sockaddr_in senderAddr);
+
+/***************************************************************************************************
+ * External Function Definitions
+ **************************************************************************************************/
+
+void artnet_start() {
+  isUdpListenerRunning = true;
+
+  if (pthread_create(&udpListener, NULL, artnet_udp_handler, NULL) < 0) {
+    log_error("pthread_create: %s", strerror(errno));
+  }
+}
+
+void artnet_stop() {
+  isUdpListenerRunning = false;
+
+  if (pthread_join(udpListener, NULL) != 0) {
+    log_error("pthread_join: %s", strerror(errno));
+  }
+}
+
+int artnet_get_dmx_data(unsigned int univerve, uint8_t *dmxData[]) {
+  if (univerve > 8) {
+    log_error("Universe %d out of bounds %d\n", univerve, 16);
+    *dmxData = NULL;
+    return -1;
+  }
+  *dmxData = artDmxBufferArray[univerve];
+  log_trace("%d;%d;%d;%d", (*dmxData)[0], (*dmxData)[1], (*dmxData)[2], (*dmxData)[3]);
+  return 0;
+}
+
+/***************************************************************************************************
+ * Internal Function Definitions
+ **************************************************************************************************/
+
+static void *artnet_udp_handler(void *arg) {
+  int fdUdpSocket = -1;
+  struct pollfd pollFdArray[1];
+  int timeoutMs;
+  int flags;
+  char buffer[ARTNET_MAX_BUFFER];
+  struct sockaddr_in serverAddr, srcAddr;
+  socklen_t srcLen = sizeof(struct sockaddr_in);
+
+  /* Create UDP socket */
+  fdUdpSocket = socket(PF_INET, SOCK_DGRAM, 0);
+  if (fdUdpSocket < 0) {
+    log_error("Opening socket failed: %s", strerror(errno));
+  }
+
+  /* Set non-blocking socket */
+  flags = fcntl(fdUdpSocket, F_GETFL, 0);
+  fcntl(fdUdpSocket, F_SETFL, flags | O_NONBLOCK);
+
+  /* pollfd structure and timeout */
+  memset(pollFdArray, 0, sizeof(pollFdArray));
+  pollFdArray[0].fd = fdUdpSocket;
+  pollFdArray[0].events = POLLIN;
+  timeoutMs = 10;
+
+  /* Configure settings in address struct */
+  serverAddr.sin_family = AF_INET;
+  serverAddr.sin_port = htons(ARTNET_PORT);
+  serverAddr.sin_addr.s_addr = inet_addr("0.0.0.0");
+  memset(serverAddr.sin_zero, '\0', sizeof(serverAddr.sin_zero));
+
+  /* Bind socket with address struct */
+  bind(fdUdpSocket, (struct sockaddr *)&serverAddr, sizeof(serverAddr));
+
+  while (isUdpListenerRunning) {
+
+    int pollReturn;
+    if ((pollReturn = poll(pollFdArray, 1, timeoutMs)) == 1) {
+      ssize_t bufferLen =
+          recvfrom(fdUdpSocket, buffer, ARTNET_MAX_BUFFER, 0, (struct sockaddr *)&srcAddr, &srcLen);
+
+      if (bufferLen <= ARTNET_MAX_BUFFER && bufferLen > sizeof(artnetHeader_t)) {
+        artnetHeader_t *artnetHeader = (artnetHeader_t *)buffer;
+
+        if (memcmp(artnetHeader->id, ARTNET_ID, sizeof(ARTNET_ID)) == 0) {
+          switch (artnetHeader->opCode) {
+          case OpDmx:
+            if (bufferLen >= 20) {
+              artDmx_t *artDmx = (artDmx_t *)buffer;
+              uint16_t dmxLength = (artDmx->lengthHi << 8) | artDmx->lengthLo;
+              uint8_t *artDmxBuffer = artDmxBufferArray[artDmx->subUni & 0x00ff];
+              if (dmxLength <= 512) {
+                // store for later use
+                memcpy(artDmxBuffer, artDmx->data, dmxLength);
+              }
+            }
+            break;
+
+          case OpPoll:
+            artnet_send_poll_reply(fdUdpSocket, srcAddr);
+            break;
+
+          default:
+            break;
+          }
+        }
+      }
+
+    } else if (pollReturn < 0) {
+      log_error("error polling %d: %s", fdUdpSocket, strerror(errno));
+    }
+  }
+
+  close(fdUdpSocket);
+
+  return NULL;
+}
+
+static void artnet_send_poll_reply(int fdUdpSocket, struct sockaddr_in senderAddr) {
+  /* Configure settings in address struct */
+  senderAddr.sin_family = AF_INET;
+  senderAddr.sin_port = htons(ARTNET_PORT);
+  memset(senderAddr.sin_zero, '\0', sizeof(senderAddr.sin_zero));
+
+  if (sendto(fdUdpSocket, (uint8_t *)&artPollReply, sizeof(artPollReply_t), 0,
+             (struct sockaddr *)&senderAddr, sizeof(senderAddr)) < 0) {
+    log_error("%s: sending poll reply to \"%s:%d\": %s", inet_ntoa(senderAddr.sin_addr),
+              senderAddr.sin_port, strerror(errno));
+  }
+}
--- a/RpiLedBars/backend/src/tasks/artnet/artnet_op_codes.h
+++ b/RpiLedBars/backend/src/tasks/artnet/artnet_op_codes.h
@@ -0,0 +1,128 @@
+#if !defined(__RPI_ARTNET_OP_CODES_H__)
+#define __RPI_ARTNET_OP_CODES_H__
+
+/* List of hex values and discriptions of Opcodes */
+
+/* This is an ArtPoll packet, no other data is contained in this UDP packet */
+#define OpPoll 0x2000
+
+/* This is an ArtPollReply Packet. It contains device status information. */
+#define OpPollReply 0x2100
+
+/* Diagnostics and data logging packet. */
+#define OpDiagData 0x2300
+
+/* Used to send text based parameter commands. */
+#define OpCommand 0x2400
+
+/* This is an ArtDmx data packet. It contains zero start code DMX512 information for a single
+ * Universe. */
+#define OpOutput 0x5000
+
+/* This is an ArtDmx data packet. It contains zero start code DMX512 information for a single
+ * Universe. */
+#define OpDmx 0x5000
+
+/* This is an ArtNzs data packet. It contains non-zero start code (except RDM) DMX512 information
+ * for a single Universe. */
+#define OpNzs 0x5100
+
+/* This is an ArtAddress packet. It contains remote programming information for a Node. */
+#define OpAddress 0x6000
+
+/* This is an ArtInput packet. It contains enable – disable data for DMX inputs. */
+#define OpInput 0x7000
+
+/* This is an ArtTodRequest packet. It is used to request a Table of Devices (ToD) for RDM
+ * discovery. */
+#define OpTodRequest 0x8000
+
+/* This is an ArtTodData packet. It is used to send a Table of Devices (ToD) for RDM discovery. */
+#define OpTodData 0x8100
+
+/* This is an ArtTodControl packet. It is used to send RDM discovery control messages. */
+#define OpTodControl 0x8200
+
+/* This is an ArtRdm packet. It is used to send all non discovery RDM messages. */
+#define OpRdm 0x8300
+
+/* This is an ArtRdmSub packet. It is used to send compressed, RDM Sub-Device data. */
+#define OpRdmSub 0x8400
+
+/* This is an ArtVideoSetup packet. It contains video screen setup information for nodes that
+ * implement the extended video features. */
+#define OpVideoSetup 0xa010
+
+/* This is an ArtVideoPalette packet. It contains colour palette setup information for nodes that
+ * implement the extended video features. */
+#define OpVideoPalette 0xa020
+
+/* This is an ArtVideoData packet. It contains display data for nodes that implement the extended
+ * video features. */
+#define OpVideoData 0xa040
+
+/* This is an ArtMacMaster packet. It is used to program the Node’s MAC address, Oem device type and
+ * ESTA manufacturer code. This is for factory initialisation of a Node. It is not to be used by
+ * applications. */
+#define OpMacMaster 0xf000
+
+/* This is an ArtMacSlave packet. It is returned by the node to acknowledge receipt of an
+ * ArtMacMaster packet. */
+#define OpMacSlave 0xf100
+
+/* This is an ArtFirmwareMaster packet. It is used to upload new firmware or firmware extensions to
+ * the Node. */
+#define OpFirmwareMaster 0xf200
+
+/* This is an ArtFirmwareReply packet. It is returned by the node to acknowledge receipt of an
+ * ArtFirmwareMaster packet or ArtFileTnMaster packet. */
+#define OpFirmwareReply 0xf300
+
+/* Uploads user file to node. */
+#define OpFileTnMaster 0xf400
+
+/* Downloads user file from node. */
+#define OpFileFnMaster 0xf500
+
+/* Node acknowledge for downloads. */
+#define OpFileFnReply 0xf600
+
+/* This is an ArtIpProg packet. It is used to reprogramme the IP, Mask and Port address of the Node.
+ */
+#define OpIpProg 0xf800
+
+/* This is an ArtIpProgReply packet. It is returned by the node to acknowledge receipt of an
+ * ArtIpProg packet. */
+#define OpIpProgReply 0xf900
+
+/* This is an ArtMedia packet. It is Unicast by a Media Server and acted upon by a Controller. */
+#define OpMedia 0x9000
+
+/* This is an ArtMediaPatch packet. It is Unicast by a Controller and acted upon by a Media Server.
+ */
+#define OpMediaPatch 0x9100
+
+/* This is an ArtMediaControl packet. It is Unicast by a Controller and acted upon by a Media
+ * Server. */
+#define OpMediaControl 0x9200
+
+/* This is an ArtMediaControlReply packet. It is Unicast by a Media Server and acted upon by a
+ * Controller. */
+#define OpMediaContrlReply 0x9300
+
+/* This is an ArtTimeCode packet. It is used to transport time code over the network. */
+#define OpTimeCode 0x9700
+
+/* Used to synchronise real time date and clock */
+#define OpTimeSync 0x9800
+
+/* Used to send trigger macros */
+#define OpTrigger 0x9900
+
+/* Requests a node's file list */
+#define OpDirectory 0x9a00
+
+/* Replies to OpDirectory with file list */
+#define OpDirectoryReply 0x9b00
+
+#endif // __RPI_ARTNET_OP_CODES_H__
--- a/RpiLedBars/backend/src/tasks/artnet/artnet_packets.h
+++ b/RpiLedBars/backend/src/tasks/artnet/artnet_packets.h
@@ -0,0 +1,178 @@
+#if !defined(__RPI_ARTNET_PACKETS_H__)
+#define __RPI_ARTNET_PACKETS_H__
+
+#include <stdint.h>
+
+#include "artnet_op_codes.h"
+#include "artnet_utils.h"
+
+typedef struct {
+  char id[8];
+  uint16_t opCode;
+} __attribute__((__packed__)) artnetHeader_t;
+
+typedef struct {
+  artnetHeader_t artnetHeader;
+  uint16_t protVer;
+  uint8_t sequence;
+  uint8_t physical;
+  uint8_t subUni;
+  uint8_t net;
+  uint8_t lengthHi;
+  uint8_t lengthLo;
+  uint8_t data[512];
+} __attribute__((__packed__)) artDmx_t;
+
+typedef struct {
+  char ID[8];
+  uint16_t OpCode;
+  uint8_t IPAddr[4];
+  uint16_t Port;
+  uint16_t VersionInfo; // The node's current FIRMWARE VERS
+  // Bits 14-8 of the 15 bit universe number are encoded into the bottom 7 bits of this field.
+  uint8_t NetSwitch;
+  // This is used in combination with SubSwitch and Swin[] or Swout[] to produce the full universe
+  // address. Bits 7-4 of the 15 bit universe number are encoded into the bottom 4 bits of this
+  // field.
+  uint8_t SubSwitch;
+  uint16_t Oem; // Manufacturer code, bit 15 set if
+  // extended features avail
+  uint8_t UbeaVersion; // Firmware version of UBEA
+  uint8_t Status;
+  // bit 0 = 0 UBEA not present
+  // bit 0 = 1 UBEA present
+  // bit 1 = 0 Not capable of RDM (Uni-directional DMX)
+  // bit 1 = 1 Capable of RDM (Bi-directional DMX)
+  // bit 2 = 0 Booted from flash (normal boot)
+  // bit 2 = 1 Booted from ROM (possible error condition)
+  // bit 3 = Not used
+  // bit 54 = 00 Universe programming authority unknown
+  // bit 54 = 01 Universe programming authority set by front panel controls
+  // bit 54 = 10 Universe programming authority set by network
+  // bit 76 = 00 Indicators Normal
+  // bit 76 = 01 Indicators Locate
+  // bit 76 = 10 Indicators Mute
+  uint8_t EstaMan[2]; // ESTA manufacturer id, lo byte
+  char ShortName[18]; // short name defaults to IP
+  char LongName[64];
+  // Text feedback of Node status or errors  also used for debug info
+  char NodeReport[64];
+
+  uint8_t NumPortsHi; // 0
+  uint8_t NumPortsLo; // 4 If num i/p ports is dif to output ports, return biggest
+
+  uint8_t PortTypes[4];
+  // bit 7 is output
+  // bit 6 is input
+  // bits 0-5 are protocol number (0= DMX, 1=MIDI)
+  // for DMX-Hub ={0xc0,0xc0,0xc0,0xc0};
+
+  uint8_t GoodInput[4];
+  // bit 7 is data received
+  // bit 6 is data includes test packets
+  // bit 5 is data includes SIP's
+  // bit 4 is data includes text
+  // bit 3 set is input is disabled
+  // bit 2 is receive errors
+  // bit 1-0 not used, transmitted as zero.
+  // Don't test for zero!
+
+  uint8_t GoodOutput[4];
+  // bit 7 is data is transmitting
+  // bit 6 is data includes test packets
+  // bit 5 is data includes SIP's
+  // bit 4 is data includes text
+  // bit 3 output is merging data.
+  // bit 2 set if DMX output short detected on power up
+  // bit 1 set if DMX output merge mode is LTP
+  // bit 0 not used, transmitted as zero.
+
+  uint8_t SwIn[4];
+  // Bits 3-0 of the 15 bit universe number are encoded into the low nibble
+  // This is used in combination with SubSwitch and NetSwitch to produce the full universe address.
+  // THIS IS FOR INPUT - ART-NET or DMX
+  // NB ON ART-NET II THESE 4 UNIVERSES WILL BE UNICAST TO.
+
+  uint8_t SwOut[4];
+  // Bits 3-0 of the 15 bit universe number are encoded into the low nibble
+  // This is used in combination with SubSwitch and NetSwitch to produce the full universe address.
+  // data belongs
+  // THIS IS FOR OUTPUT - ART-NET or DMX.
+  // NB ON ART-NET II THESE 4 UNIVERSES WILL BE UNICAST TO.
+
+  uint8_t SwVideo;
+  // Low nibble is the value of the video
+  // output channel
+
+  uint8_t SwMacro;
+  // Bit 0 is Macro input 1
+  // Bit 7 is Macro input 8
+
+  uint8_t SwRemote;
+  // Bit 0 is Remote input 1
+  // Bit 7 is Remote input 8
+
+  uint8_t Spare1; // Spare, currently zero
+  uint8_t Spare2; // Spare, currently zero
+  uint8_t Spare3; // Spare, currently zero
+  uint8_t Style;  // Set to Style code to describe type of equipment
+
+  uint8_t Mac[6]; // Mac Address, zero if info not available
+
+  uint8_t BindIp[4]; // If this unit is part of a larger or modular product, this is the IP of the
+                     // root device.
+  uint8_t BindIndex; // Set to zero if no binding, otherwise this number represents the order of
+                     // bound devices. A lower number means closer to root device.
+
+  uint8_t Status2;
+  // bit 0 = 0 Node does not support web browser
+  // bit 0 = 1 Node supports web browser configuration
+
+  // bit 1 = 0 Node's IP address is manually configured
+  // bit 1 = 1 Node's IP address is DHCP configured
+
+  // bit 2 = 0 Node is not DHCP capable
+  // bit 2 = 1 Node is DHCP capable
+
+  // bit 2-7 not implemented, transmit as zero
+
+  uint8_t Filler[26]; // Filler bytes, currently zero.
+} artPollReply_t;
+
+static artPollReply_t const artPollReply = {
+    .ID = "Art-Net",
+    .OpCode = OpPollReply,
+    .IPAddr = {0},
+    .Port = ARTNET_PORT,
+    .VersionInfo = 1,
+    .NetSwitch = 0,
+    .SubSwitch = 0,
+    .Oem = 0x0190,
+    .UbeaVersion = 0,
+    .Status = 0,
+    .EstaMan = {0, 0},
+    .ShortName = "Tropicananass",
+    .LongName = "Tropicananass Artnetnode",
+    .NodeReport = {0},
+    .NumPortsHi = 0,
+    .NumPortsLo = 1,
+    .PortTypes = {0x80, 0, 0, 0},
+    .GoodInput = {0},
+    .GoodOutput = {0},
+    .SwIn = {0},
+    .SwOut = {0},
+    .SwVideo = 0,
+    .SwMacro = 0,
+    .SwRemote = 0,
+    .Spare1 = 0,
+    .Spare2 = 0,
+    .Spare3 = 0,
+    .Style = 0,
+    .Mac = {0},
+    .BindIp = {0},
+    .BindIndex = 0,
+    .Status2 = 0b00000000,
+    .Filler = {0},
+};
+
+#endif // __RPI_ARTNET_PACKETS_H__
--- a/RpiLedBars/backend/src/tasks/artnet/artnet_utils.h
+++ b/RpiLedBars/backend/src/tasks/artnet/artnet_utils.h
@@ -0,0 +1,25 @@
+#if !defined(__RPI_ARTNET_UTILS_H__)
+#define __RPI_ARTNET_UTILS_H__
+
+#define ARTNET_PORT 0x1936
+
+// Buffers
+#define ARTNET_MAX_BUFFER 530
+#define DMX_MAX_BUFFER 512
+
+// Packet constants
+#define ARTNET_ID "Art-Net"
+#define ARTNET_DMX_START_LOC 18
+
+// Packet confines
+#define ARTNET_SHORT_NAME_MAX_LENGTH 17
+#define ARTNET_LONG_NAME_MAX_LENGTH 63
+
+// DMX settings
+#define DMX_MAX_OUTPUTS 4
+#define DMX_MS_BETWEEN_TICKS 25
+
+// RDM
+#define DMX_RDM_STARTCODE 0xCC
+
+#endif // __RPI_ARTNET_UTILS_H__
--- a/RpiLedBars/backend/src/tasks/cava/cava.c
+++ b/RpiLedBars/backend/src/tasks/cava/cava.c
@@ -0,0 +1,225 @@
+/** @file rpi_cava.h
+ *  @brief This module contains continuous tasks for cava (spectrum analyzer) comunication
+ */
+
+/***************************************************************************************************
+ * Includes
+ **************************************************************************************************/
+#include "cava.h"
+
+#include <errno.h>
+#include <fcntl.h>
+#include <poll.h>
+#include <pthread.h>
+#include <signal.h>
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <wait.h>
+
+#include "log.h"
+
+/***************************************************************************************************
+ * Preprocessor Constants and Macros
+ **************************************************************************************************/
+
+/**
+ * Constant for Maximum char in a line (128 number of (5 char + 1 delim) + \n )
+ */
+#define MAXLINECHAR CAVA_BAR_NUMBER *(5 + 1) + 1
+
+/***************************************************************************************************
+ * Type and Contant Definitions
+ **************************************************************************************************/
+
+/***************************************************************************************************
+ * Persistent Variables
+ **************************************************************************************************/
+
+/**
+ * Cava process id
+ */
+pid_t cavaPid;
+/**
+ * Boolean for interrupting the main thread loop
+ */
+bool isFifoReaderRunning = false;
+/**
+ * Task thread identifier
+ */
+pthread_t fifoReader;
+
+int fdCavaInput;
+char lineBuffer[MAXLINECHAR];
+uint16_t buffer[128 + 2];
+
+/***************************************************************************************************
+ * Internal Function Prototypes
+ **************************************************************************************************/
+
+/**
+ * @brief This function is used to thread main execution function
+ *
+ * @param   arg not used.
+ *
+ * @return  NULL.
+ */
+static void *fifo_to_buffer(void *arg);
+
+static int start_cava_process();
+
+static void stop_cava_process();
+
+/***************************************************************************************************
+ * External Function Definitions
+ **************************************************************************************************/
+
+void cava_start() {
+  isFifoReaderRunning = true;
+  pthread_create(&fifoReader, NULL, fifo_to_buffer, NULL);
+}
+
+void cava_stop() {
+  isFifoReaderRunning = false;
+  if (pthread_join(fifoReader, NULL) != 0) {
+    log_error("pthread_join: %s", strerror(errno));
+  }
+}
+
+int cava_get_buffer(uint16_t **buffer_dst) {
+  *buffer_dst = buffer;
+  log_trace("%d;%d;%d;%d", buffer[0], buffer[1], buffer[2], buffer[3]);
+  return 0;
+}
+
+/***************************************************************************************************
+ * Internal Function Definitions
+ **************************************************************************************************/
+
+static void *fifo_to_buffer(void *arg) {
+  struct pollfd fds[1];
+  int timeoutMs;
+  int ret;
+  size_t valueIndex = 0, charOffset = 0;
+  char strValue[6] = "0\0";
+  bool hasToBeDiscarded = true;
+
+  if ((fdCavaInput = start_cava_process()) < 0) {
+    log_error("y'a un truc qui a pas marché");
+  }
+
+  memset(fds, 0, sizeof(fds));
+  fds[0].fd = fdCavaInput;
+  fds[0].events = POLLIN;
+  timeoutMs = 10;
+
+  while (isFifoReaderRunning) {
+
+    if ((ret = poll(fds, 1, timeoutMs)) == 1) {
+      int nread;
+      nread = read(fdCavaInput, lineBuffer, 128 + 1);
+
+      if (nread >= 0) {
+        for (size_t i = 0; i < nread; ++i) {
+          char current = lineBuffer[i];
+
+          if (hasToBeDiscarded) {
+            if (current == '\n') {
+              charOffset = 0;
+              strValue[charOffset] = '\0';
+              valueIndex = 0;
+              hasToBeDiscarded = false;
+            }
+
+          } else {
+            if ('0' <= current && current <= '9') {
+              strValue[charOffset++] = current;
+            } else if (current == '\n' || current == ';') {
+              strValue[charOffset] = '\0';
+              charOffset = 0;
+              buffer[valueIndex++] = atoi(strValue);
+
+              if (current == '\n' || valueIndex > 129) {
+                valueIndex = 0;
+
+                if (valueIndex > 129) {
+                  log_warn("Buffer overflow, \\n missed, discarding next");
+                  hasToBeDiscarded = true;
+                }
+              }
+
+            } else {
+              log_warn("Unexpected char %d [%c]\n", current, current);
+            }
+          }
+        }
+      } else {
+        if (errno != EAGAIN) {
+          log_error("read: %s", strerror(errno));
+        }
+      }
+    } else if (ret < 0) {
+      log_error("polling %d: %s\n", fdCavaInput, strerror(errno));
+    }
+  }
+
+  stop_cava_process();
+  close(fdCavaInput);
+
+  return NULL;
+}
+
+static int start_cava_process() {
+  int fdCavaPipe[2];
+
+  if (pipe(fdCavaPipe) < 0) {
+    log_error("Cava pipe failure: %s", strerror(errno));
+    return -EXIT_FAILURE;
+  }
+
+  if ((cavaPid = fork()) < 0) {
+    log_error("Cava fork failure: %s", strerror(errno));
+    exit(-EXIT_FAILURE);
+  }
+
+  if (cavaPid == 0) {
+    /* Child process*/
+    // int fdLogOut;
+    char *args[] = {"cava", "-p", "/home/pi/LedBars/RpiLedBars/cava_config", NULL};
+
+    /* Close reading end of the pipe */
+    close(fdCavaPipe[0]);
+    /* Dup writing end of the pipe in place of stdout */
+    dup2(fdCavaPipe[1], STDOUT_FILENO);
+    /* Close writing end of the pipe */
+    close(fdCavaPipe[1]);
+
+    /* Open / create a log file for cava */
+    // fdLogOut = open("/dev/null", O_WRONLY, NULL);
+    /* Dup file in place of stderr */
+    // dup2(fdLogOut, STDERR_FILENO);
+
+    execvp(args[0], args);
+    log_error("Cava execvp failure or return: %s", strerror(errno));
+    exit(-EXIT_FAILURE);
+  } else {
+    int flags;
+    /* Close writing end of the pipe */
+    close(fdCavaPipe[1]);
+    /* Set reading end of the pipe non-blocking */
+    flags = fcntl(fdCavaPipe[0], F_GETFL, 0);
+    fcntl(fdCavaPipe[0], F_SETFL, flags | O_NONBLOCK);
+    /* Return reading end of the pipe */
+    return fdCavaPipe[0];
+  }
+
+  /* Unreachable  */
+  return -1;
+}
+
+static void stop_cava_process() {
+  kill(cavaPid, SIGTERM);
+  waitpid(0, NULL, WNOHANG);
+}
--- a/RpiLedBars/backend/src/tasks/includes/artnet.h
+++ b/RpiLedBars/backend/src/tasks/includes/artnet.h
@@ -0,0 +1,50 @@
+/** @file artnet.h
+ *  @brief This module contains continuous tasks for artnet node communications.
+ *
+ * This is the header file for the definition of services to allow managing thread acting as artnet
+ * node.
+ */
+#if !defined(__ARTNET_H__)
+#define __ARTNET_H__
+
+/***************************************************************************************************
+ * Includes
+ **************************************************************************************************/
+#include <stdint.h>
+
+/***************************************************************************************************
+ * Preprocessor Constants and Macros
+ **************************************************************************************************/
+
+/***************************************************************************************************
+ * Type and Contant Definitions
+ **************************************************************************************************/
+
+/***************************************************************************************************
+ * Global Variables
+ **************************************************************************************************/
+
+/***************************************************************************************************
+ * External Function Prototypes
+ **************************************************************************************************/
+
+/**
+ * @brief Start artnet node module
+ **/
+void artnet_start();
+
+/**
+ * @brief Stop artnet node module
+ */
+void artnet_stop();
+
+/**
+ * @brief Get last DMX data received for the specified universe
+ *
+ * @param[in]   univerve The universe to get data from
+ *
+ * @param[out]  dmxData  The pointer to the DMX data array
+ */
+int artnet_get_dmx_data(unsigned int univerve, uint8_t *dmxData[]);
+
+#endif /* __ARTNET_H__ */
--- a/RpiLedBars/backend/src/tasks/includes/cava.h
+++ b/RpiLedBars/backend/src/tasks/includes/cava.h
@@ -0,0 +1,37 @@
+/** @file cava.h
+ *  @brief This module contains continuous tasks for cava (spectrum analyzer) comunication
+ */
+#if !defined(__CAVA_H__)
+#define __CAVA_H__
+
+/***************************************************************************************************
+ * Includes
+ **************************************************************************************************/
+
+#include <stdint.h>
+
+/***************************************************************************************************
+ * Preprocessor Constants and Macros
+ **************************************************************************************************/
+
+#define CAVA_BAR_NUMBER 128
+
+/***************************************************************************************************
+ * Type and Contant Definitions
+ **************************************************************************************************/
+
+/***************************************************************************************************
+ * Global Variables
+ **************************************************************************************************/
+
+/***************************************************************************************************
+ * External Function Prototypes
+ **************************************************************************************************/
+
+int cava_get_buffer(uint16_t **buffer_dst);
+
+void cava_start();
+
+void cava_stop();
+
+#endif /* __CAVA_H__ */
--- a/RpiLedBars/backend/src/tasks/includes/selector.h
+++ b/RpiLedBars/backend/src/tasks/includes/selector.h
@@ -0,0 +1,34 @@
+/** @file selector.h
+ *  @brief This module contains continuous tasks for cava (spectrum analyzer) comunication
+ */
+#if !defined(__SELECTOR_TASK_H__)
+#define __SELECTOR_TASK_H__
+
+/***************************************************************************************************
+ * Includes
+ **************************************************************************************************/
+
+/***************************************************************************************************
+ * Preprocessor Constants and Macros
+ **************************************************************************************************/
+
+/***************************************************************************************************
+ * Type and Contant Definitions
+ **************************************************************************************************/
+
+/***************************************************************************************************
+ * Global Variables
+ **************************************************************************************************/
+
+/***************************************************************************************************
+ * External Function Prototypes
+ **************************************************************************************************/
+
+/**
+ * @brief Start selector listener module
+ **/
+void selector_start();
+
+void selector_stop();
+
+#endif /* __SELECTOR_TASK_H__ */
--- a/RpiLedBars/backend/src/tasks/includes/websocket.h
+++ b/RpiLedBars/backend/src/tasks/includes/websocket.h
@@ -0,0 +1,43 @@
+/** @file websocket.h
+ *  @brief This module
+ */
+
+#if !defined(__WEBSOCKET_H__)
+#define __WEBSOCKET_H__
+
+/***************************************************************************************************
+ * Includes
+ **************************************************************************************************/
+
+/***************************************************************************************************
+ * Preprocessor Constants and Macros
+ **************************************************************************************************/
+
+/***************************************************************************************************
+ * Type and Contant Definitions
+ **************************************************************************************************/
+
+/***************************************************************************************************
+ * Global Variables
+ **************************************************************************************************/
+
+/***************************************************************************************************
+ * External Function Prototypes
+ **************************************************************************************************/
+
+/**
+ * @brief Start websocket module
+ **/
+void websocket_start();
+
+/**
+ * @brief Start websocket module
+ **/
+void websocket_stop();
+
+/**
+ * @brief Send mode to websocket client
+ **/
+void websocket_send_mode(int mode);
+
+#endif /* __WEBSOCKET_H__ */
--- a/RpiLedBars/backend/src/tasks/selector/selector.c
+++ b/RpiLedBars/backend/src/tasks/selector/selector.c
@@ -0,0 +1,87 @@
+/** @file selector.c
+ *  @brief This module contains continuous tasks for cava (spectrum analyzer) comunication
+ */
+
+/***************************************************************************************************
+ * Includes
+ **************************************************************************************************/
+#include "selector.h"
+
+#include <errno.h>
+#include <pthread.h>
+#include <string.h>
+#include <unistd.h>
+
+#include "../../drivers/selector/rpi_selector.h"
+#include "../../rpi_param.h"
+
+#include "log.h"
+
+/***************************************************************************************************
+ * Preprocessor Constants and Macros
+ **************************************************************************************************/
+
+#define LISTENER_INTERVAL 500000
+
+/***************************************************************************************************
+ * Type and Contant Definitions
+ **************************************************************************************************/
+
+/***************************************************************************************************
+ * Persistent Variables
+ **************************************************************************************************/
+
+pthread_t selectorListener;
+/**
+ * Boolean for interrupting the main thread loop
+ */
+bool isSelectorListenerRunning = false;
+
+/***************************************************************************************************
+ * Internal Function Prototypes
+ **************************************************************************************************/
+
+/**
+ * @brief This function is used to thread main execution function
+ *
+ * @param   arg not used.
+ *
+ * @return  NULL.
+ */
+static void *listen_to_selector(void *arg);
+
+/***************************************************************************************************
+ * External Function Definitions
+ **************************************************************************************************/
+
+void selector_start() {
+  isSelectorListenerRunning = true;
+  pthread_create(&selectorListener, NULL, listen_to_selector, NULL);
+}
+
+void selector_stop() {
+  isSelectorListenerRunning = false;
+  if (pthread_join(selectorListener, NULL) != 0) {
+    log_error("pthread_join: %s", strerror(errno));
+  }
+}
+
+/***************************************************************************************************
+ * Internal Function Definitions
+ **************************************************************************************************/
+
+static void *listen_to_selector(void *arg) {
+  int previousPosition;
+  selector_setup();
+
+  while (isSelectorListenerRunning) {
+    int newPosition = selector_get_position();
+    if (newPosition != -1 && newPosition != previousPosition) {
+      set_mode(newPosition);
+      previousPosition = newPosition;
+    }
+    usleep(LISTENER_INTERVAL);
+  }
+
+  return NULL;
+}
--- a/RpiLedBars/backend/src/tasks/websocket/websocket.c
+++ b/RpiLedBars/backend/src/tasks/websocket/websocket.c
@@ -0,0 +1,194 @@
+/** @file websocket.c
+ *  @brief This module
+ */
+
+/***************************************************************************************************
+ * Includes
+ **************************************************************************************************/
+
+#include "websocket.h"
+
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "log.h"
+#include "ws.h"
+
+#include "../../rpi_param.h"
+
+/***************************************************************************************************
+ * Preprocessor Constants and Macros
+ **************************************************************************************************/
+
+#define MAX_TOKEN 10
+
+/***************************************************************************************************
+ * Type and Contant Definitions
+ **************************************************************************************************/
+
+/***************************************************************************************************
+ * Persistent Variables
+ **************************************************************************************************/
+
+int client_fd = -1;
+
+/***************************************************************************************************
+ * Internal Function Prototypes
+ **************************************************************************************************/
+/**
+ * @brief Called when a client connects to the server.
+ *
+ * @param fd File Descriptor belonging to the client. The @p fd parameter
+ * is used in order to send messages and retrieve informations
+ * about the client.
+ */
+void onopen(int fd);
+
+/**
+ * @brief Called when a client disconnects to the server.
+ *
+ * @param fd File Descriptor belonging to the client. The @p fd parameter
+ * is used in order to send messages and retrieve informations
+ * about the client.
+ */
+void onclose(int fd);
+
+/**
+ * @brief Called when a client connects to the server.
+ *
+ * @param fd File Descriptor belonging to the client. The
+ * @p fd parameter is used in order to send messages and
+ * retrieve informations about the client.
+ *
+ * @param msg Received message, this message can be a text
+ * or binary message.
+ *
+ * @param size Message size (in bytes).
+ *
+ * @param type Message type.
+ */
+void onmessage(int fd, const unsigned char *msg, uint64_t size, int type);
+
+void mode_command_handler(char *payload);
+
+void pattern_command_handler(char *payload);
+
+void color_command_handler(char *payload);
+
+/***************************************************************************************************
+ * External Function Definitions
+ **************************************************************************************************/
+
+void websocket_start() {
+  struct ws_events evs;
+  evs.onopen = &onopen;
+  evs.onclose = &onclose;
+  evs.onmessage = &onmessage;
+  ws_socket(&evs, 8080, 1);
+}
+
+void websocket_stop() {}
+
+void websocket_send_mode(int mode) {
+  char msg[] = "m:0";
+  msg[2] = '0' + mode;
+  if (client_fd != -1) {
+    log_debug("Sending mode \"%s\"", msg);
+    ws_sendframe_txt(client_fd, msg, true);
+  }
+}
+
+/***************************************************************************************************
+ * Internal Function Definitions
+ **************************************************************************************************/
+
+void onopen(int fd) {
+  char *cli;
+  cli = ws_getaddress(fd);
+  log_debug("Connection opened, client: %d | addr: %s", fd, cli);
+  free(cli);
+  client_fd = fd;
+}
+
+void onclose(int fd) {
+  char *cli;
+  cli = ws_getaddress(fd);
+  log_debug("Connection closed, client: %d | addr: %s", fd, cli);
+  free(cli);
+  client_fd = -1;
+}
+
+void onmessage(int fd, const unsigned char *msg, uint64_t size, int type) {
+  char msgStr[size + 1];
+  char *command, *payload;
+  char *cli = ws_getaddress(fd);
+  log_trace("Received message: %s (size: %" PRId64 ", type: %d), from: %s/%d", msg, size, type, cli,
+            fd);
+
+  strcpy(msgStr, (char *)msg);
+  command = strtok(msgStr, ":");
+  if (command != NULL) {
+    payload = strtok(NULL, ":");
+    if (payload != NULL && strlen(command) == 1) {
+      switch (command[0]) {
+      case 'm':
+        mode_command_handler(payload);
+        break;
+      case 'p':
+        pattern_command_handler(payload);
+        break;
+      case 'c':
+        color_command_handler(payload);
+        break;
+
+      default:
+        log_warn("Unkown command in \"%s\"", msgStr);
+        break;
+      }
+    } else {
+      log_warn("Empty payload in \"%s\"", msgStr);
+    }
+  } else {
+    log_warn("No command found in \"%s\"", msgStr);
+  }
+
+  free(cli);
+}
+
+void mode_command_handler(char *payload) {
+  int newMode = atoi(payload);
+  if (0 <= newMode && newMode <= 3) {
+    set_mode(newMode);
+  } else {
+    log_warn("Unknown mode : %s", payload);
+  }
+}
+
+void pattern_command_handler(char *payload) {
+  int newPattern = atoi(payload);
+  if (0 <= newPattern && newPattern <= 3) {
+    set_pattern(newPattern);
+  } else {
+    log_warn("Unknown pattern : %s", payload);
+  }
+}
+
+void color_command_handler(char *payload) {
+  int i = 0;
+  char *tokenArray[MAX_TOKEN] = {NULL};
+  tokenArray[i] = strtok(payload, ",");
+  while (tokenArray[i] && i < MAX_TOKEN - 1) {
+    tokenArray[++i] = strtok(NULL, ",");
+  }
+  log_debug("tokens[%d]", i);
+  for (size_t n = 0; n < i; ++n) {
+    log_debug(" - %s", tokenArray[n]);
+  }
+  if (atoi(tokenArray[0]) == 0) {
+    set_hue_base(LED_NCHANS, atoi(tokenArray[1]) * INT8_MAX / HUE_MAX);
+    set_saturation(LED_NCHANS, atoi(tokenArray[2]) * INT8_MAX / 100);
+    set_luminosity(LED_NCHANS, atoi(tokenArray[3]) * INT8_MAX / 100);
+  }
+}