File content as of revision 6:9aeb18bebe85:

#include "mbed.h"
#include "glibr.h"

Serial USB_link(USBTX, USBRX);       // USB initialization

//PwmOut LED(A2);                     // LED initialization

glibr capt1(D4,D5);                // I²C initialization : D4 = SDA ; D5 = SCL

CAN can1(PA_11, PA_12);                  // CAN initialization

CANMessage msg;

bool initialization(void)
{
    //  USB initialization
    USB_link.baud(115200);
    USB_link.printf("Debut prog\r\n");

    // CAN init
    can1.frequency(1000000);

    // LED initialization
    // LED.period_ms(10);
    // LED.write(0.5);

    // sensor initalization
    if( (capt1.ginit()) && (capt1.enableLightSensor(true)) && (capt1.enableProximitySensor(true)) ) {
        return true;
    } else {
        return false;
    }
}

int main (void)
{
    uint16_t r,g,b;
    uint8_t a ;
    char color;

    if (initialization())  USB_link.printf("Initialization complete \r\n");
    else USB_link.printf("Error during initialization\r\n");

    while(1) {
        capt1.readRedLight(r);
        capt1.readGreenLight(g);
        capt1.readBlueLight(b);
        capt1.readProximity(a);

        //display of red, green and proximty variables
        //USB_link.printf("r: %hu g : %hu  prox : %hu \r\n ",r,g,a);

        if (a<200) {
            color = 0 ;  // 0 means no object being measured
        } else if (r > g ) {
            color = 1 ;  // 1 means red
        } else {
            color = 2 ;  // 2 means green
        }
        //USB_link.printf("color : %hu \r\n", color);
        
        // read of the CAN 
        if (can1.read(msg)) {    
            // verification of the ID ( 0x4B0 )
            if (msg.id==1200) { 
                can1.write(CANMessage(1200,&color,1)); // writing of the color value on the CAN bus
            }
        }

    }

}