I'm trying to send data from my PC to my STM32 board over USB VCP, but the function CDC_Receive_FS never seems to get called. In fact none of the "_FS" functions in usbd_cdc_if.c seem to get called (except CDC_Transmit_FS) as setting a breakpoint in them doesn't halt the program.
The COM port shows up on my computer and CDC_Transmit_FS works perfectly fine, plus I've tried sending data using putty, platformio device monitor, arduino serial monitor, and a python script but none of them worked so I don't think the issue is on the PC side.
I'm using an STM32F401CCU6. I cant add links but the board I'm using is called "Songhe STM32F401 Development Board" on amazon. Here is my code - its just supposed to send back any data received:
main.c:
/* Includes ------------------------------------------------------------------*/
#include "main.h"
#include "usb_device.h"
/* Private includes ----------------------------------------------------------*/
/* USER CODE BEGIN Includes */
#include "usbd_cdc.h"
#include "usbd_cdc_if.h"
#include <stdio.h>
/* USER CODE END Includes */
/* Private typedef -----------------------------------------------------------*/
/* USER CODE BEGIN PTD */
/* USER CODE END PTD */
/* Private define ------------------------------------------------------------*/
/* USER CODE BEGIN PD */
/* USER CODE END PD */
/* Private macro -------------------------------------------------------------*/
/* USER CODE BEGIN PM */
/* USER CODE END PM */
/* Private variables ---------------------------------------------------------*/
/* USER CODE BEGIN PV */
/* USER CODE END PV */
/* Private function prototypes -----------------------------------------------*/
void SystemClock_Config(void);
static void MX_GPIO_Init(void);
/* USER CODE BEGIN PFP */
/* USER CODE END PFP */
/* Private user code ---------------------------------------------------------*/
/* USER CODE BEGIN 0 */
uint8_t buffer[64];
uint8_t newData = 0;
/* 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 */
if(!newData) continue;
CDC_Transmit_FS(buffer, newData);
newData = 0;
}
/* USER CODE END 3 */
}
CDC_Receive_FS:
extern uint8_t buffer[64];
extern uint8_t newData;
static int8_t CDC_Receive_FS(uint8_t* Buf, uint32_t *Len)
{
/* USER CODE BEGIN 6 */
USBD_CDC_SetRxBuffer(&hUsbDeviceFS, &Buf[0]);
USBD_CDC_ReceivePacket(&hUsbDeviceFS);
memset(buffer, '\0', 64);
uint8_t len = (uint8_t)*Len;
memcpy(buffer, Buf, len);
memset(Buf, 0, len);
newData = len;
return (USBD_OK);
/* USER CODE END 6 */
}
Is there anything else I need to do to set up VCP receive?
