File content as of revision 34:0f1968ca238a:

#include "mbed.h"
#include "WS2811.h"

// per LED: 3 * 20 mA = 60mA max
// 60 LEDs: 60 * 60mA = 3600 mA max
// 120 LEDs: 7200 mA max
unsigned const nLEDs = MAX_LEDS_PER_STRIP;

unsigned const DATA_OUT_PIN1 = 7; 
unsigned const DATA_OUT_PIN2 = 0; 
unsigned const DATA_OUT_PIN3 = 3; 
unsigned const DATA_OUT_PIN4 = 4; 
unsigned const DATA_OUT_PIN5 = 5; 
unsigned const DATA_OUT_PIN6 = 6; 
unsigned const DATA_OUT_PIN7 = 10; 
unsigned const DATA_OUT_PIN8 = 11; 

Serial pc(USBTX, USBRX);

static void clearScreen(WS2811 &strip)
{
    unsigned nLEDs = strip.numPixels();
    for (unsigned i = 0; i < nLEDs; i++) {
        strip.setPixelColor(i, 0, 0, 0);
    }
    strip.show();
}

int main(void)
{
    pc.baud(9600);
    WS2811 *lightStrip;
    WS2811 lightStrip1(nLEDs, DATA_OUT_PIN1);
    WS2811 lightStrip2(nLEDs, DATA_OUT_PIN2);
    WS2811 lightStrip3(nLEDs, DATA_OUT_PIN3);
    WS2811 lightStrip4(nLEDs, DATA_OUT_PIN4);    
    WS2811 lightStrip5(nLEDs, DATA_OUT_PIN5);
    WS2811 lightStrip6(nLEDs, DATA_OUT_PIN6);
    WS2811 lightStrip7(nLEDs, DATA_OUT_PIN7);
    WS2811 lightStrip8(nLEDs, DATA_OUT_PIN8);
    
    lightStrip1.begin();
    lightStrip2.begin();
    lightStrip3.begin();
    lightStrip4.begin();
    lightStrip5.begin();
    lightStrip6.begin();
    lightStrip7.begin();
    lightStrip8.begin();

    uint8_t q = 0;
    char char_buff[10];
    char curr_char = 0;
    
    for (;;) {
        /* I have defined a custom UART packet protocol
         * A general packet may look like: 
         * 
         * array[0]     x-coordinate [0, 31]
         * array[1]     y-coordinate [0, 15]
         * array[2]     R (5-bit)
         * array[3]     G (5-bit)
         * array[4]     B (5-bit)
         * array[5]     254 (delimiter)
         */
        while(curr_char != 255 && q < 7)
        {
            /* If there is UART traffic */
            if(pc.readable())
            {
                curr_char = pc.getc();
                char_buff[q] = curr_char;
                q++;
            }
        }
        
        if((char_buff[0] == 254) && (q >= 5)){
            switch(int(char_buff[2])){
            case 0:
                lightStrip = &lightStrip1;
                break;
            case 1:
                lightStrip = &lightStrip2;
                break;
            case 2:
                lightStrip = &lightStrip3;
                break;
            case 3:
                lightStrip = &lightStrip4;
                break;
            case 4:
                lightStrip = &lightStrip5;
                break;
            case 5:
                lightStrip = &lightStrip6;
                break;
            case 6:
                lightStrip = &lightStrip7;
                break;
            case 7:
                lightStrip = &lightStrip8;
                break;        
            default:
                lightStrip = &lightStrip1;
                q = 0;
                break;   
            }
            
            (*lightStrip).setPixelColor(int(char_buff[1]), int(char_buff[3]), int(char_buff[4]), int(char_buff[5]));                    
            
            (*lightStrip).show();
            pc.putc(48+int(char_buff[0]));
        }
        else{            
            //clearScreen(*lightStrip);
        }
        q = 0;
        curr_char = 0;
        WS2811::startDMA();

    }
}