STM32F4xx USB VCP

/**
 *  USB VCP for STM32F4xx example.
 *
 *  @author     Tilen Majerle
 *  @email      tilen@majerle.eu
 *  @website    http://stm32f4-discovery.com
 *  @ide        Keil uVision
 *
 * Add line below to use this example with F429 Discovery board (in defines.h file)
 *
 * #define USE_USB_OTG_HS
 */
#include "tm_stm32f4_usb_vcp.h"
#include "tm_stm32f4_disco.h"
#include "defines.h"

#include <stdio.h>
#include <stdlib.h>

int main(void) {
    uint8_t c, i;
    uint16_t number;
    char str[5];
    /* System Init */
    SystemInit();

    /* Initialize LED's. Make sure to check settings for your board in tm_stm32f4_disco.h file */
    TM_DISCO_LedInit();

    /* Initialize USB VCP */
    TM_USB_VCP_Init();

    /* Set counter to 0 */
    i = 0;
    while (1) {
        /* USB configured OK, drivers OK */
        if (TM_USB_VCP_GetStatus() == TM_USB_VCP_CONNECTED) {
            /* Turn on GREEN led */
            TM_DISCO_LedOn(LED_GREEN);
            //TM_DISCO_LedOff(LED_RED);
            /* If something arrived at VCP */
            if (TM_USB_VCP_Getc(&c) == TM_USB_VCP_DATA_OK) {
                /* Add new character to string */
                str[i] = (char) c;
                /* Increase counter */
                i++;
                /* Return data back */
                //TM_USB_VCP_Putc(c);
            }
        } else {
            /* USB not OK */
            TM_DISCO_LedOff(LED_GREEN);
            //TM_DISCO_LedOn(LED_RED);
        }
        /* If 3 bytes are received */
        if (i == 3) {
            str[3] = 0;
            /* Reset counter */
            i = 0;
            /* Convert string to number */
            number = atoi(str);

            if (number == 100) {
                /* Number is 100 */
                TM_DISCO_LedOn(LED_RED);
            }
        }
    }
}