File content as of revision 0:07ac8eb1700b:

#include "mbed.h"

DigitalOut latch(p15);
DigitalOut enable(p16);
Serial color_sensor(p9, p10);

DigitalOut out_latch(p22);
DigitalOut out_enable(p21);
SPI spi(p11, p12, p13);
SPI out_spi(p5, p6, p7);

void RGB_LED(int red, int green, int blue)
{
    unsigned int low_color=0;
    unsigned int high_color=0;
    high_color=(blue<<4)|((red&0x3C0)>>6);
    low_color=(((red&0x3F)<<10)|(green));
    spi.write(high_color);
    spi.write(low_color);
    latch=1;
    latch=0;
}

void out_RGB_LED(int red, int green, int blue)
{
    unsigned int low_color=0;
    unsigned int high_color=0;
    high_color=(blue<<4)|((red&0x3C0)>>6);
    low_color=(((red&0x3F)<<10)|(green));
    out_spi.write(high_color);
    out_spi.write(low_color);
    out_latch=1;
    out_latch=0;
}
void split_RGB(char* color_str)
{
    char *save_ptr;
    char *p = strtok_r(color_str, ",", &save_ptr);
    int red = strtol(p, NULL, 10);
    p = strtok_r(NULL, ",", &save_ptr);
    int green = strtol(p, NULL, 10);
    p = strtok_r(NULL, ",", &save_ptr);
    int blue = strtol(p, NULL, 10);
    out_RGB_LED(red, green, blue);
    return;
}
void get_color()
{
    if(color_sensor.readable()) {
        printf("get into the function\n");
        char str[11];
        int i = 0;
        char c;
        while(c=color_sensor.getc()) {
            //printf("read: %c\n", c);
            if(c!='\r') {
                str[i] = c;
                i++;
            } else {
                break;
            }
        }
        //color_sensor.scanf("%s", &str);
        printf("another read: ");
        printf("%s\n", str);
        printf("i=%d\n", i);
        split_RGB(str);
    }
    return;
}
int main()
{
    int red=0;
    int green=0;
    int blue=0;
    spi.format(16,0);
    spi.frequency(500000);
    out_spi.format(16,0);
    out_spi.frequency(500000);
    enable=0;
    latch=0;
    out_enable=0;
    out_latch=0;
    color_sensor.baud(38400);
    wait(2);
    while(1) {
        red = rand() % 50;
        green = rand() % 50;
        blue = rand() % 50;
        RGB_LED( red, green, blue);
        
        get_color();
        wait(1);
    }
 

}