[STM32F401CCU6] USB CDC

일단.. 보드는

 

4877_schematic-STM32F411CEU6_WeAct_Black_Pill_V2.0.pdf

0.10MB

PA11, PA12로 연결되어 있다.

 

IOC 설정

 

이렇게 USB_DEVICE 설정하고...

이젠 모든 진행을 STM32CubeIDE 으로 진행 할 예정입니다.

1. main.c 에서 코딩은...

/* USER CODE BEGIN PV */
uint8_t buffer[64]={NULL};
/* USER CODE END PV */

int _write(int file, char *ptr, int len){
    CDC_Transmit_FS(ptr, len);
    return (len);
}
/* USER CODE END 0 */

/**
  * @brief  The application entry point.
  * @retval int
  */
int main(void)
{
  /* USER CODE BEGIN 1 */

  /* USER CODE END 1 */

  /* MCU Configuration--------------------------------------------------------*/

  /* Reset of all peripherals, Initializes the Flash interface and the Systick. */
  HAL_Init();

  /* USER CODE BEGIN Init */

  /* USER CODE END Init */

  /* Configure the system clock */
  SystemClock_Config();

  /* USER CODE BEGIN SysInit */

  /* USER CODE END SysInit */

  /* Initialize all configured peripherals */
  MX_GPIO_Init();
  MX_USB_DEVICE_Init();
  /* USER CODE BEGIN 2 */

  /* USER CODE END 2 */

  /* Infinite loop */
  /* USER CODE BEGIN WHILE */
  while (1)
  {
    /* USER CODE END WHILE */

    /* USER CODE BEGIN 3 */
      uint8_t buf_len = strlen(buffer);

      if(buf_len > 0)
      {
          printf("->%s",buffer);
          memset (buffer, '\0', 64); 
      }
  }
  /* USER CODE END 3 */
}

2. usbd_cdc_if.c 에서 

 

 

extern uint8_t buffer[64];

 

 

uint8_t len = (uint8_t)*Len;
memset(buffer, '\0', 64);  // clear the buffer
memcpy(buffer, Buf, len);  // copy the data to the buffer
memset(Buf, '\0', len);   // clear the Buf also