File content as of revision 4:7a998a6934f1:

#include "mbed.h"
#include "WS2812.h"
#include "PixelArray.h"

#define WS2812_BUF 3
#define NUM_COLORS 9
#define NUM_LEDS_PER_COLOR 3
PixelArray px(WS2812_BUF);

// See the program page for information on the timing numbers
// The given numbers are for the K64F
WS2812 ws(p9, WS2812_BUF, 5, 10, 10, 15);

int main()
{

    ws.useII(WS2812::PER_PIXEL); // use per-pixel intensity scaling
    
    // set up the colours we want to draw with
    int colorbuf[NUM_COLORS] = {0xfe0000};//,0x00f0ff,0x00ff00,0x00ffff,0xffffff,0x00ff00,0x00ffff,0x0000ff,0xff00ff};
    
   
        
    // for each of the colours (j) write out 10 of them
    // the pixels are written at the colour*10, plus the colour position
    // all modulus 60 so it wraps around
    for (int i = 0; i < WS2812_BUF; i++) {
        px.Set(i, colorbuf[(i / NUM_LEDS_PER_COLOR) % NUM_COLORS]);
    }

    // now all the colours are computed, add a fade effect using intensity scaling
    // compute and write the II value for each pixel
    for (int j=0; j<WS2812_BUF; j++) {
        // px.SetI(pixel position, II value)
        //px.SetI(j%WS2812_BUF, 0xff+(0xf*(j%NUM_LEDS_PER_COLOR)));     //full brightness
        px.SetI(j%WS2812_BUF, 0xf+(0xf*(j%NUM_LEDS_PER_COLOR)));        //Dim lighting
    }


    // Now the buffer is written, rotate it
    // by writing it out with an increasing offset
     while (1) {
        if(colorbuf[0]>=0xfffffe)
            {
            //colorbuf[0]=0x000000;    
            } 
            
        if(colorbuf[0]^0x000fff>=0x0001ff)
            {
            colorbuf[0]=colorbuf[0]+0x000001-0x010000;
            //colorbuf[0] = 0x000000;    
            }
        else if(colorbuf[0]^0x00ffff>=0x01ffff)
            {
            colorbuf[0]=colorbuf[0]+0x000100-0x000001;  
            }
        else if(colorbuf[0]<=0xfffffe)
            {
            colorbuf[0]=colorbuf[0]+0x010001-0x000100;    
            } 
        
        
               

        for (int i = 0; i < WS2812_BUF; i++) {
            px.Set(i, colorbuf[(i / NUM_LEDS_PER_COLOR) % NUM_COLORS]);
            px.SetI(i%WS2812_BUF, 0xf+(0xf*(i%NUM_LEDS_PER_COLOR)));        //Dim lighting
        }
        for (int z=WS2812_BUF; z >= 0 ; z--) {
            ws.write_offsets(px.getBuf(),z,z,z);
            //wait(0.5);
    
            }
        wait(0.01);
        }
}