File content as of revision 0:76241820e391:

#include "mbed.h"
#include "rtos.h"

DigitalOut getcommand(LED1);
Serial pc(USBTX, USBRX);
DigitalOut leds[2] = {DigitalOut(LED2), DigitalOut(LED3)};
DigitalOut threadled(LED4);

char buf[2];
char command[2];

void led(void const *args) {
    while(true) {
        threadled = !threadled;
        Thread::wait(100);
    }
}


int main() {
    Thread thread(led);

    while(1) {
    if (pc.readable()) {
        pc.printf("something get\n");
        buf[0] = pc.getc();
        buf[1] = pc.getc();
        if (buf[0] == 0xFF && buf[1] == 0xFF) {
            getcommand = 1;
            pc.printf("its a command!\n");
            
            for(int i = 0; i < 2; i++) {
                pc.printf("mgmg\n");
                command[i] = pc.getc();
                pc.printf("%x\n", command[i]);
            }
            
            switch (command[0]) {
                case 0x01:
                    leds[0] = !leds[0];
                    pc.printf("led1 : on/off\n");
                    break;
                case 0x02:
                    leds[1] = !leds[1];
                    pc.printf("led2 : on/off\n");
                    break;
            }
        }
    }
    }
}