Alex Dyer / Mbed 2 deprecated RGB_LED_Strip

Code to control an individually addressable RGB strip.

Dependencies:   mbed WS2812 PixelArray

main.cpp@0:b47973ee96a9, 2019-12-14 (annotated)

Committer:
ahdyer
Date:
Sat Dec 14 16:57:40 2019 +0000
Revision:
0:b47973ee96a9
Code to control individually addressable RGB strips

Who changed what in which revision?

UserRevisionLine numberNew contents of line
ahdyer 0:b47973ee96a9 1 #include "mbed.h"
ahdyer 0:b47973ee96a9 2 #include "WS2812.h"
ahdyer 0:b47973ee96a9 3 #include "PixelArray.h"
ahdyer 0:b47973ee96a9 4
ahdyer 0:b47973ee96a9 5 #define WS2812_BUF 30
ahdyer 0:b47973ee96a9 6 #define NUM_COLORS 6
ahdyer 0:b47973ee96a9 7 #define NUM_LEDS_PER_COLOR 1
ahdyer 0:b47973ee96a9 8
ahdyer 0:b47973ee96a9 9 PixelArray px(WS2812_BUF);
ahdyer 0:b47973ee96a9 10
ahdyer 0:b47973ee96a9 11 // See the program page for information on the timing numbers
ahdyer 0:b47973ee96a9 12 // The given numbers are for the K64F
ahdyer 0:b47973ee96a9 13 WS2812 ws(D9, WS2812_BUF, 3, 11, 10, 11);
ahdyer 0:b47973ee96a9 14
ahdyer 0:b47973ee96a9 15 int main()
ahdyer 0:b47973ee96a9 16 {
ahdyer 0:b47973ee96a9 17
ahdyer 0:b47973ee96a9 18 ws.useII(WS2812::PER_PIXEL); // use per-pixel intensity scaling
ahdyer 0:b47973ee96a9 19
ahdyer 0:b47973ee96a9 20 // set up the colours we want to draw with
ahdyer 0:b47973ee96a9 21 int colorbuf[NUM_COLORS] = {0xfffff0,0xffff00,0xfff000,0xff0000,0xf00000,0xffffff};
ahdyer 0:b47973ee96a9 22
ahdyer 0:b47973ee96a9 23 // for each of the colours (j) write out 10 of them
ahdyer 0:b47973ee96a9 24 // the pixels are written at the colour*10, plus the colour position
ahdyer 0:b47973ee96a9 25 // all modulus 60 so it wraps around
ahdyer 0:b47973ee96a9 26 for (int i = 0; i < WS2812_BUF; i++) {
ahdyer 0:b47973ee96a9 27 px.Set(i, colorbuf[(i / NUM_LEDS_PER_COLOR) % NUM_COLORS]);
ahdyer 0:b47973ee96a9 28 }
ahdyer 0:b47973ee96a9 29
ahdyer 0:b47973ee96a9 30 // now all the colours are computed, add a fade effect using intensity scaling
ahdyer 0:b47973ee96a9 31 // compute and write the II value for each pixel
ahdyer 0:b47973ee96a9 32 for (int j=0; j<WS2812_BUF; j++) {
ahdyer 0:b47973ee96a9 33 // px.SetI(pixel position, II value)
ahdyer 0:b47973ee96a9 34 px.SetI(j%WS2812_BUF, 0x0f);
ahdyer 0:b47973ee96a9 35 }
ahdyer 0:b47973ee96a9 36
ahdyer 0:b47973ee96a9 37
ahdyer 0:b47973ee96a9 38 // Now the buffer is written, rotate it
ahdyer 0:b47973ee96a9 39 // by writing it out with an increasing offset
ahdyer 0:b47973ee96a9 40 while (1) {
ahdyer 0:b47973ee96a9 41 for (int z=WS2812_BUF; z >= 0 ; z--) {
ahdyer 0:b47973ee96a9 42 ws.write_offsets(px.getBuf(),z,z,z);
ahdyer 0:b47973ee96a9 43 wait(0.075);
ahdyer 0:b47973ee96a9 44 }
ahdyer 0:b47973ee96a9 45 }
ahdyer 0:b47973ee96a9 46
ahdyer 0:b47973ee96a9 47 }