File content as of revision 3:7559835b072a:

#include "mbed.h"
#include "neopixel.h"

// This must be an SPI MOSI pin.
#define DATA_PIN p11

DigitalIn BPA(p17);
DigitalIn BPB(p18);

void generateTourne(neopixel::Pixel * out, uint32_t index, uintptr_t extra)
{
    uint32_t brightness = 100;
    out->red   = ((index + extra) & 0x1) ? brightness : 0;
    out->green = ((index + extra) & 0x2) ? brightness : 0;
    out->blue  = ((index + extra) & 0x4) ? brightness : 0;
}

void generateRouge(neopixel::Pixel * out, uint32_t index, uintptr_t extra)
{
    uint32_t brightness = 100;
    out->red   = 255;
    out->green = 0;
    out->blue  = 0;
}
void generateVert(neopixel::Pixel * out, uint32_t index, uintptr_t extra)
{
    uint32_t brightness = 100;
    out->red   = 0;
    out->green = 255;
    out->blue  = 0;
}

int main()
{
    // Create a temporary DigitalIn so we can configure the pull-down resistor.
    // (The mbed API doesn't provide any other way to do this.)
    // An alternative is to connect an external pull-down resistor.
    DigitalIn(DATA_PIN, PullDown);

    // The pixel array control class.
    neopixel::PixelArray array(DATA_PIN);

    uint32_t offset = 0;
    while (1) {
        
        if (!(BPA)){
            array.update(generateVert, 100, offset++);
            wait(5);
        }
        if (!(BPB)){
            array.update(generateRouge, 100, offset++);
            wait(5);
        }
        //if ((BPA == 1)&&(BPB == 1))
            array.update(generateTourne, 100, offset++);
            
        wait_ms(250);
    }
}