Erik Tryggvason / Mbed 2 deprecated WS2812_Fader

A program that fades between a selection of colors.

Dependencies:   PixelArray WS2812 mbed

main.cpp@3:b99f66d3e77e, 2017-03-12 (annotated)

Committer:
theros
Date:
Sun Mar 12 23:04:00 2017 +0000
Revision:
3:b99f66d3e77e
Parent:
2:381421ec57e1 
Debugging cleanup

Who changed what in which revision?

UserRevisionLine numberNew contents of line
theros 0:de636c7cdfda 1 #include "mbed.h"
theros 0:de636c7cdfda 2 #include "WS2812.h"
theros 0:de636c7cdfda 3 #include "PixelArray.h"
theros 0:de636c7cdfda 4
theros 0:de636c7cdfda 5 #define WS2812_BUF 77 //number of LEDs in the array
theros 0:de636c7cdfda 6 #define NUM_COLORS 6 //number of colors to store in the array
theros 2:381421ec57e1 7 #define NUM_STEPS 8 //number of steps between colors
theros 0:de636c7cdfda 8
theros 0:de636c7cdfda 9 DigitalOut usrLed(LED1);
theros 0:de636c7cdfda 10 PixelArray px(WS2812_BUF);
theros 0:de636c7cdfda 11
theros 0:de636c7cdfda 12 // See the program page for information on the timing numbers
theros 0:de636c7cdfda 13 WS2812 ws(D9, WS2812_BUF, 6,17,9,14); //nucleo-f411re
theros 0:de636c7cdfda 14
theros 1:ad5c2cfb2002 15 int color_set(uint8_t red,uint8_t green, uint8_t blue)
theros 1:ad5c2cfb2002 16 {
theros 1:ad5c2cfb2002 17 return ((red<<16) + (green<<8) + blue);
theros 1:ad5c2cfb2002 18 }
theros 1:ad5c2cfb2002 19
theros 1:ad5c2cfb2002 20 // 0 <= stepNumber <= lastStepNumber
theros 1:ad5c2cfb2002 21 int interpolate(int startValue, int endValue, int stepNumber, int lastStepNumber)
theros 1:ad5c2cfb2002 22 {
theros 1:ad5c2cfb2002 23 return (endValue - startValue) * stepNumber / lastStepNumber + startValue;
theros 1:ad5c2cfb2002 24 }
theros 1:ad5c2cfb2002 25
theros 0:de636c7cdfda 26 int main()
theros 0:de636c7cdfda 27 {
theros 0:de636c7cdfda 28 int colorIdx = 0;
theros 1:ad5c2cfb2002 29 int colorTo = 0;
theros 1:ad5c2cfb2002 30 int colorFrom = 0;
theros 1:ad5c2cfb2002 31
theros 1:ad5c2cfb2002 32 uint8_t ir = 0;
theros 1:ad5c2cfb2002 33 uint8_t ig = 0;
theros 1:ad5c2cfb2002 34 uint8_t ib = 0;
theros 0:de636c7cdfda 35
theros 0:de636c7cdfda 36 ws.useII(WS2812::PER_PIXEL); // use per-pixel intensity scaling
theros 0:de636c7cdfda 37
theros 0:de636c7cdfda 38 // set up the colours we want to draw with
theros 0:de636c7cdfda 39 int colorbuf[NUM_COLORS] = {0x2f0000,0x2f2f00,0x002f00,0x002f2f,0x00002f,0x2f002f};
theros 0:de636c7cdfda 40
theros 0:de636c7cdfda 41 // Now the buffer is written, write it to the led array.
theros 0:de636c7cdfda 42 while (1)
theros 0:de636c7cdfda 43 {
theros 1:ad5c2cfb2002 44 //get starting RGB components for interpolation
theros 1:ad5c2cfb2002 45 std::size_t c1 = colorbuf[colorFrom];
theros 1:ad5c2cfb2002 46 std::size_t r1 = (c1 & 0xff0000) >> 16;
theros 1:ad5c2cfb2002 47 std::size_t g1 = (c1 & 0x00ff00) >> 8;
theros 1:ad5c2cfb2002 48 std::size_t b1 = (c1 & 0x0000ff);
theros 1:ad5c2cfb2002 49
theros 1:ad5c2cfb2002 50 //get ending RGB components for interpolation
theros 1:ad5c2cfb2002 51 std::size_t c2 = colorbuf[colorTo];
theros 1:ad5c2cfb2002 52 std::size_t r2 = (c2 & 0xff0000) >> 16;
theros 1:ad5c2cfb2002 53 std::size_t g2 = (c2 & 0x00ff00) >> 8;
theros 1:ad5c2cfb2002 54 std::size_t b2 = (c2 & 0x0000ff);
theros 1:ad5c2cfb2002 55
theros 1:ad5c2cfb2002 56 for (int i = 0; i <= NUM_STEPS; i++)
theros 0:de636c7cdfda 57 {
theros 1:ad5c2cfb2002 58 ir = interpolate(r1, r2, i, NUM_STEPS);
theros 1:ad5c2cfb2002 59 ig = interpolate(g1, g2, i, NUM_STEPS);
theros 1:ad5c2cfb2002 60 ib = interpolate(b1, b2, i, NUM_STEPS);
theros 1:ad5c2cfb2002 61
theros 1:ad5c2cfb2002 62 //write the color value for each pixel
theros 1:ad5c2cfb2002 63 px.SetAll(color_set(ir,ig,ib));
theros 1:ad5c2cfb2002 64
theros 1:ad5c2cfb2002 65 //write the II value for each pixel
theros 1:ad5c2cfb2002 66 px.SetAllI(32);
theros 1:ad5c2cfb2002 67
theros 1:ad5c2cfb2002 68 for (int i = WS2812_BUF; i >= 0; i--)
theros 1:ad5c2cfb2002 69 {
theros 1:ad5c2cfb2002 70 ws.write(px.getBuf());
theros 1:ad5c2cfb2002 71 }
theros 0:de636c7cdfda 72 }
theros 0:de636c7cdfda 73
theros 2:381421ec57e1 74 colorFrom = colorIdx;
theros 0:de636c7cdfda 75 colorIdx++;
theros 0:de636c7cdfda 76
theros 0:de636c7cdfda 77 if (colorIdx >= NUM_COLORS)
theros 0:de636c7cdfda 78 {
theros 0:de636c7cdfda 79 colorIdx = 0;
theros 0:de636c7cdfda 80 }
theros 1:ad5c2cfb2002 81
theros 2:381421ec57e1 82 colorTo = colorIdx;
theros 0:de636c7cdfda 83 }
theros 0:de636c7cdfda 84 }