stm 32F4 Virtual comport won't work

FD.1 · ‎2020-06-12

Hello,

i am trying to use the virtual comport of the stm32f407vgt6 to communicate with my win 10 pc. I want to send 16 bytes of data.

I created a base project in cubeMX and insert the cdc_transmit. There it is possible to send 16 bytes of data via the virtual comport to my pc. I can see the incoming datas in hterm.

My Problem is, that it's impossible to access the COM port via hterm or labview, when i add some lines of code, e.g. set up an ADC. If the send buffer is bigger then 19 bytes i got the same problem.

The following program isn't working.

/* USER CODE BEGIN Header */
/**
  ******************************************************************************
  * @file           : main.c
  * @brief          : Main program body
  ******************************************************************************
  * @attention
  *
  * <h2><center>&copy; Copyright (c) 2020 STMicroelectronics.
  * All rights reserved.</center></h2>
  *
  * This software component is licensed by ST under BSD 3-Clause license,
  * the "License"; You may not use this file except in compliance with the
  * License. You may obtain a copy of the License at:
  *                        opensource.org/licenses/BSD-3-Clause
  *
  ******************************************************************************
  */
/* USER CODE END Header */
 
/* Includes ------------------------------------------------------------------*/
#include "main.h"
#include "adc.h"
#include "dma.h"
#include "i2c.h"
#include "i2s.h"
#include "spi.h"
#include "tim.h"
#include "usb_device.h"
#include "gpio.h"
 
/* Private includes ----------------------------------------------------------*/
/* USER CODE BEGIN Includes */
 
/* USER CODE END Includes */
 
/* Private typedef -----------------------------------------------------------*/
/* USER CODE BEGIN PTD */
 
/* USER CODE END PTD */
 
/* Private define ------------------------------------------------------------*/
/* USER CODE BEGIN PD */
#define TX_BUF_SIZE 	16
#define adcSequenz		8
/* USER CODE END PD */
 
/* Private macro -------------------------------------------------------------*/
/* USER CODE BEGIN PM */
 
/* USER CODE END PM */
 
/* Private variables ---------------------------------------------------------*/
 
/* USER CODE BEGIN PV */
uint16_t DeviceAdress= 0x20 << 1;
 
volatile uint8_t Tx_Flag;
uint32_t ms_cnt = 0;
uint8_t txbuff[TX_BUF_SIZE];
 
uint32_t cycCnt = 0;
uint16_t adc1Data[adcSequenz];
/* USER CODE END PV */
 
/* Private function prototypes -----------------------------------------------*/
void SystemClock_Config(void);
/* USER CODE BEGIN PFP */
extern uint8_t CDC_Transmit_FS(uint8_t* Buf, uint16_t len);
/* USER CODE END PFP */
 
/* Private user code ---------------------------------------------------------*/
/* USER CODE BEGIN 0 */
/**
  * @brief  Period elapsed callback in non blocking mode
  * @param  htim: TIM handle
  * @retval None
  */
void HAL_TIM_PeriodElapsedCallback(TIM_HandleTypeDef *htim)
{
	uint8_t i;
 
	for(i=0; i<TX_BUF_SIZE; i++)
	{
		txbuff[i] = cycCnt;  // AD Wandler simuliert
	}
 
	// Start ADC DMA
    if (htim->Instance == htim14.Instance)
    {
    	HAL_ADC_Start(&hadc1);
    	HAL_ADC_Start_DMA(&hadc1, (uint32_t*) adc1Data, adcSequenz);
        /* Toggle LED */
    	//HAL_GPIO_TogglePin(GPIOD, LD4_Pin);
    	ms_cnt++;
    	if(ms_cnt >= 500)
    	{
    		Tx_Flag = 1;
    		ms_cnt = 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 */
  HAL_StatusTypeDef stat = 0;
  uint8_t adcTxBuffer[16];
  uint8_t adcRxBuffer[16];
 
  uint8_t datatx[2];
  uint8_t datarx[1];
  datarx[0]=0x00;
  /* 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_DMA_Init();
  MX_I2C1_Init();
  MX_I2S3_Init();
  MX_SPI1_Init();
  MX_USB_DEVICE_Init();
  MX_ADC1_Init();
  MX_TIM14_Init();
  /* USER CODE BEGIN 2 */
  float show[adcSequenz];
  int i = 0;
  //int j = 0;
 
  adcTxBuffer[0] = 0x00;
  adcTxBuffer[1] = 0xF8;
  stat = HAL_I2C_Mem_Write(&hi2c1, DeviceAdress, 0x02, 2, adcTxBuffer, 2, 100);
  stat = HAL_I2C_Mem_Read(&hi2c1, DeviceAdress, 0x02, 2, adcRxBuffer, 2, 100);
  HAL_Delay(1);
  HAL_GPIO_TogglePin(GPIOA, 1);
  HAL_Delay(1);
  HAL_GPIO_TogglePin(GPIOA, 1);
 
  //stat = HAL_I2C_Mem_Read(&hi2c1, DeviceAdress, 0x00, 2, adcRxBuffer, 2, 100);
 
  /* USER CODE END 2 */
 
  /* Infinite loop */
  /* USER CODE BEGIN WHILE */
  while (1)
  {
	  for(i=0; i<adcSequenz; i++)
	  {
		  show[i] = (float) adc1Data[i]*(float) 3.3 / (float)0xFFF;
	  }
 
 
	  if(Tx_Flag == 1)
	  {
 
//		for(j = 0; j < 8; j++)
//		{
//			txbuff[2*j+1] = adc1Data[j] & 0x00FF;
//			txbuff[2*j] = (adc1Data[j] & 0xFF00) >> 8;
//		}
		  cycCnt++;
		  Tx_Flag = 0;
		  CDC_Transmit_FS(txbuff, sizeof(txbuff));
		  HAL_GPIO_TogglePin(GPIOD, LD4_Pin);
	  }
    /* USER CODE END WHILE */
 
    /* USER CODE BEGIN 3 */
  }
  /* USER CODE END 3 */
}
 
/**
  * @brief System Clock Configuration
  * @retval None
  */
void SystemClock_Config(void)
{
  RCC_OscInitTypeDef RCC_OscInitStruct = {0};
  RCC_ClkInitTypeDef RCC_ClkInitStruct = {0};
  RCC_PeriphCLKInitTypeDef PeriphClkInitStruct = {0};
 
  /** Configure the main internal regulator output voltage 
  */
  __HAL_RCC_PWR_CLK_ENABLE();
  __HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE1);
  /** Initializes the CPU, AHB and APB busses clocks 
  */
  RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE;
  RCC_OscInitStruct.HSEState = RCC_HSE_ON;
  RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
  RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;
  RCC_OscInitStruct.PLL.PLLM = 8;
  RCC_OscInitStruct.PLL.PLLN = 336;
  RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV2;
  RCC_OscInitStruct.PLL.PLLQ = 7;
  if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
  {
    Error_Handler();
  }
  /** Initializes the CPU, AHB and APB busses clocks 
  */
  RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK|RCC_CLOCKTYPE_SYSCLK
                              |RCC_CLOCKTYPE_PCLK1|RCC_CLOCKTYPE_PCLK2;
  RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
  RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
  RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV4;
  RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV2;
 
  if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_5) != HAL_OK)
  {
    Error_Handler();
  }
  PeriphClkInitStruct.PeriphClockSelection = RCC_PERIPHCLK_I2S;
  PeriphClkInitStruct.PLLI2S.PLLI2SN = 192;
  PeriphClkInitStruct.PLLI2S.PLLI2SR = 2;
  if (HAL_RCCEx_PeriphCLKConfig(&PeriphClkInitStruct) != HAL_OK)
  {
    Error_Handler();
  }
}
 
/* USER CODE BEGIN 4 */
 
/* USER CODE END 4 */
 
/**
  * @brief  This function is executed in case of error occurrence.
  * @retval None
  */
void Error_Handler(void)
{
  /* USER CODE BEGIN Error_Handler_Debug */
  /* User can add his own implementation to report the HAL error return state */
 
  /* USER CODE END Error_Handler_Debug */
}
 
#ifdef  USE_FULL_ASSERT
/**
  * @brief  Reports the name of the source file and the source line number
  *         where the assert_param error has occurred.
  * @param  file: pointer to the source file name
  * @param  line: assert_param error line source number
  * @retval None
  */
void assert_failed(uint8_t *file, uint32_t line)
{ 
  /* USER CODE BEGIN 6 */
  /* User can add his own implementation to report the file name and line number,
     tex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */
  /* USER CODE END 6 */
}
#endif /* USE_FULL_ASSERT */

I attached a working example. So i have no idea where the mistake can be.