Chris Styles / Mbed 2 deprecated ChrisRGB-Ring

Experimental WS2812 driver and pixel buffer

Dependencies:   PixelArray WS2812 mbed

main.cpp@1:bf4d674d3692, 2014-08-18 (annotated)

Committer:
chris
Date:
Mon Aug 18 13:27:10 2014 +0000
Revision:
1:bf4d674d3692
Parent:
0:6b847e039b3b
Child:
2:57db905622ca
Rotate buffer using offsets

Who changed what in which revision?

UserRevisionLine numberNew contents of line
chris 0:6b847e039b3b 1 #include "mbed.h"
chris 0:6b847e039b3b 2 #include "WS2812.h"
chris 0:6b847e039b3b 3 #include "PixelArray.h"
chris 0:6b847e039b3b 4
chris 0:6b847e039b3b 5 #define WS2812_BUF 60
chris 0:6b847e039b3b 6
chris 0:6b847e039b3b 7 WS2812 ws(p5,WS2812_BUF);
chris 0:6b847e039b3b 8 PixelArray px(WS2812_BUF);
chris 0:6b847e039b3b 9
chris 1:bf4d674d3692 10 DigitalOut led(LED1);
chris 1:bf4d674d3692 11
chris 0:6b847e039b3b 12 int main()
chris 0:6b847e039b3b 13 {
chris 0:6b847e039b3b 14
chris 1:bf4d674d3692 15 int ctr=0;
chris 0:6b847e039b3b 16 ws.useII(2); // use per-pixel intensity scaling
chris 0:6b847e039b3b 17
chris 0:6b847e039b3b 18 // set up the colours we want to draw with
chris 0:6b847e039b3b 19 int colorbuf[6] = {0x2f0000,0x2f2f00,0x002f00,0x002f2f,0x00002f,0x2f002f};
chris 0:6b847e039b3b 20
chris 0:6b847e039b3b 21
chris 1:bf4d674d3692 22 int h=0;
chris 0:6b847e039b3b 23
chris 1:bf4d674d3692 24 // for each of the colours (j) write out 10 of them
chris 1:bf4d674d3692 25 // the pixel get written at the rotation offset, plus the colour*10, plus the colour position
chris 1:bf4d674d3692 26 // all modulus 60 so it wraps around
chris 1:bf4d674d3692 27 for (int i =0; i<6; i++) {
chris 1:bf4d674d3692 28 for (int j=0; j<10; j++) {
chris 1:bf4d674d3692 29 px.Set((h+(i*10)+j)%60,colorbuf[i]);
chris 0:6b847e039b3b 30 }
chris 0:6b847e039b3b 31 }
chris 1:bf4d674d3692 32
chris 1:bf4d674d3692 33 // now all the colours are computed, add a fade effect
chris 1:bf4d674d3692 34 // compute and write the II value for each pixel
chris 1:bf4d674d3692 35 for (int j=0; j<60; j++) {
chris 1:bf4d674d3692 36 // px.SetI(pixel position, II value)
chris 1:bf4d674d3692 37 px.SetI( (h+j)%60, 0xf+(0xf*(j%10)));
chris 1:bf4d674d3692 38 }
chris 1:bf4d674d3692 39
chris 1:bf4d674d3692 40 // the buffer is written
chris 1:bf4d674d3692 41 // rotate by writing it out with an increasing offset
chris 1:bf4d674d3692 42
chris 1:bf4d674d3692 43
chris 1:bf4d674d3692 44 while (1) {
chris 1:bf4d674d3692 45 for (int z=59; z >= 0 ; z--) {
chris 1:bf4d674d3692 46 ws.write_offsets(px.getBuf(),z,z,z); // write out the buffer
chris 1:bf4d674d3692 47 wait(0.075);
chris 1:bf4d674d3692 48 if (ctr==1000) {
chris 1:bf4d674d3692 49 ctr=0;
chris 1:bf4d674d3692 50 led=!led;
chris 1:bf4d674d3692 51 } else {
chris 1:bf4d674d3692 52 ctr++;
chris 1:bf4d674d3692 53 }
chris 1:bf4d674d3692 54 }
chris 1:bf4d674d3692 55 }
chris 1:bf4d674d3692 56
chris 0:6b847e039b3b 57 }