Support for RGBW LEDs like SK6812RGBW

.gitignore

@@ -1 +1,2 @@
 node_modules
+.vscode

Gruntfile.js

@@ -2,7 +2,6 @@ var arduino = process.env.ARDUINO_PATH;
 
 var boards = require("./firmware/boards.js");
 var boardlist = Object.keys(boards).toString();
-
 module.exports = function(grunt) {
 
     // configure the tasks
@@ -128,6 +127,7 @@ module.exports = function(grunt) {
 
     // dynamically create the compile targets for the various boards
     Object.keys(boards).forEach(function(key) {
+
         grunt.config(["exec", "firmata_" + key], {
             command:function() {
                 return arduino + " --verify --verbose-build --board "  + boards[key].package +

firmware/build/backpack/ws2812.cpp

@@ -12,11 +12,12 @@ bool strip_changed[MAX_STRIPS]; // used to optimise strip writes.
 uint8_t *px;
 uint16_t px_count;
 uint8_t strip_count = 0; // number of strips being used.
-uint8_t color_depth = 3; // Bytes used to hold one pixel
+uint8_t color_depth = 4; // Bytes used to hold one pixel
 
 uint8_t offsetRed;
 uint8_t offsetGreen;
 uint8_t offsetBlue;
+uint8_t offsetWhite;
 
 void ws2812_initialise() {
     // initialises the strip defaults.
@@ -77,9 +78,10 @@ uint8_t set_rgb_at(uint16_t index, uint32_t px_value) {
         uint16_t tmp_pixel;
         tmp_pixel = index * color_depth;
 
-        px[OFFSET_R(tmp_pixel)] = (uint8_t)(px_value >> 16);
-        px[OFFSET_G(tmp_pixel)] = (uint8_t)(px_value >> 8);
-        px[OFFSET_B(tmp_pixel)] = (uint8_t)px_value;
+        px[OFFSET_R(tmp_pixel)] = (uint8_t)(px_value >> 24);
+        px[OFFSET_G(tmp_pixel)] = (uint8_t)(px_value >> 16);
+        px[OFFSET_B(tmp_pixel)] = (uint8_t)(px_value >> 8);
+        px[OFFSET_W(tmp_pixel)] = (uint8_t)px_value;
 
         return 0;
     }
@@ -181,7 +183,8 @@ void process_command(byte argc, byte *argv){
             uint32_t strip_colour = (uint32_t)argv[1] +
                 ((uint32_t)argv[2]<<7) +
                 ((uint32_t)argv[3]<<14) +
-                ((uint32_t)argv[4] << 21);
+                ((uint32_t)argv[4]<< 21) +
+                ((uint32_t)argv[5] << 28);
 
             if (! isShifting) {
                 if (strip_colour == 0) {
@@ -201,7 +204,7 @@ void process_command(byte argc, byte *argv){
             // sets the pixel given by the index to the given colour
             uint16_t index = (uint16_t)argv[1] + ((uint16_t)argv[2]<<7);
             uint32_t colour = (uint32_t)argv[3] + ((uint32_t)argv[4]<<7) +
-                ((uint32_t)argv[5]<<14) + ((uint32_t)argv[6] << 21);
+                ((uint32_t)argv[5]<<14) + ((uint32_t)argv[6] << 21) + ((uint32_t)argv[6] << 28);
 
             if (isShifting) {
                 break;
@@ -261,6 +264,9 @@ void process_command(byte argc, byte *argv){
                         case PIXEL_COLOUR_BRG:
                             setColorOrderBRG();
                             break;
+                        case PIXEL_COLOUR_RGBW:
+                            setColorOrderRGBW();
+                            break;
                     }
 
                     // now get the strand length and set it
@@ -318,6 +324,13 @@ void setColorOrderBRG() {
 	offsetGreen = 2;
 }
 
+void setColorOrderRGBW() {
+	offsetRed = 0;
+	offsetGreen = 1;
+	offsetBlue = 2;
+	offsetWhite = 3;
+}
+
 #if DEBUG
 void print_pixels() {
     // prints out the array of pixel values
@@ -333,7 +346,9 @@ void print_pixels() {
         serialport.print(px[OFFSET_G(index)]);
         serialport.print(" ");
         serialport.print(px[OFFSET_B(index)]);
-        serialport.println();
+        serialport.print(" ");
+        serialport.print(px[OFFSET_W(index)]);
+
     }
 }
 
@@ -343,3 +358,15 @@ int freeRam () {
   return (int) &v - (__brkval == 0 ? (int) &__heap_start : (int) __brkval);
 }
 #endif
+
+
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+

firmware/build/backpack/ws2812.h

@@ -35,6 +35,7 @@
 #define PIXEL_COLOUR_GRB        0x0
 #define PIXEL_COLOUR_RGB        0x1
 #define PIXEL_COLOUR_BRG        0x2
+#define PIXEL_COLOUR_RGBW       0x3
 
 #define STRIP_START_PIN 0
 
@@ -47,6 +48,7 @@
 #define OFFSET_R(r) r+offsetRed
 #define OFFSET_G(g) g+offsetGreen
 #define OFFSET_B(b) b+offsetBlue
+#define OFFSET_W(w) w+offsetWhite
 
 void ws2812_initialise();
 void ws2812_initialise(bool backpack);
@@ -57,6 +59,8 @@ uint8_t set_rgb_at(uint16_t index, uint32_t px_value);
 void setColorOrderRGB();
 void setColorOrderGRB();
 void setColorOrderBRG();
+void setColorOrderRGBW();
+
 
 #if DEBUG
 void print_pixels();