UART7 RX interrupt issue stm32h7s78

[harshpanchal_6]

Hello,

I am working on stm32h7s78 using UART-4 & UART-7  and MXCHIP EMC3080-P WIFI/BLE module. However,  I am facing issues regarding the UART-7 RX interrupt. If I transmit the command from UART-4 to UART-7 it will transmit the same command data to EMC3080-P WIFI/BLE module. In addition, WIFI/BLE module will send the response to UART-7 but I am not getting the UART-7 callback.

But if I do the debugging with USB-to-TTL and EMC3080-P module I am receiving the expected response from the module.

Bellow is the code for the reference your will be appreciated.

Thank you,

Harsh

#include "main.h"
#include "stdio.h"
#include "string.h"
#include "stdbool.h"
#define RX_BUFFER_7     36
uint8_t rx_buff[20];
uint8_t rx_buff_7[RX_BUFFER_7];

UART_HandleTypeDef huart4;
UART_HandleTypeDef huart7;

static void MX_GPIO_Init(void);
static void MX_FLASH_Init(void);
static void MX_UART4_Init(void);
static void MX_UART7_Init(void);
void HAL_UART_RxCpltCallback(UART_HandleTypeDef *huart);

void HAL_UART_RxCpltCallback(UART_HandleTypeDef *huart)
{

	if(huart->Instance == UART4)
	{
		uint8_t tx_buff[20];
	//	 Print received message
		printf("Received on UART4: %s\n\r", rx_buff);


		uint16_t length = (uint16_t) rx_buff[0];

		memcpy(tx_buff,&rx_buff[1],length);

		HAL_UART_Transmit(&huart7, tx_buff,length,  1000);

	//	 Re-enable UART interrupt for the full buffer to receive more data

		HAL_UART_Receive_IT(&huart4, rx_buff, 20);
		memset(rx_buff, 0, 20);

	}
	else
	{
		//	 Print received message
			printf("Received on UART7: %s\n\r", rx_buff_7);
			HAL_UART_Receive_IT(&huart7, rx_buff_7, RX_BUFFER_7);
	}

}

int main(void)
{

  /* USER CODE BEGIN 1 */



  /* USER CODE END 1 */

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

  /* Update SystemCoreClock variable according to RCC registers values. */
  SystemCoreClockUpdate();

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

  /* USER CODE BEGIN Init */

  /* USER CODE END Init */

  /* USER CODE BEGIN SysInit */

  /* USER CODE END SysInit */

  /* Initialize all configured peripherals */
  MX_GPIO_Init();
  MX_FLASH_Init();
  MX_UART4_Init();
  MX_UART7_Init();
  /* USER CODE BEGIN 2 */

  HAL_UART_Receive_IT(&huart4, rx_buff, 20);
  HAL_UART_Receive_IT(&huart7, rx_buff_7, RX_BUFFER_7);
  printf("Start....\n\r");
//  /* USER CODE END 2 */

  /* Infinite loop */
  /* USER CODE BEGIN WHILE */
  while (1)
  {
    /* USER CODE END WHILE */
//	  HAL_GPIO_TogglePin(GREEN_LED_GPIO_Port, GREEN_LED_Pin);
//	  HAL_Delay(1000);

  /* USER CODE BEGIN 3 */
  }

  /* USER CODE END 3 */
}

/**
  * @brief FLASH Initialization Function
  *  None
  * @retval None
  */
static void MX_FLASH_Init(void)
{

  /* USER CODE BEGIN FLASH_Init 0 */

  /* USER CODE END FLASH_Init 0 */

  /* USER CODE BEGIN FLASH_Init 1 */

  /* USER CODE END FLASH_Init 1 */
  /* USER CODE BEGIN FLASH_Init 2 */

  /* USER CODE END FLASH_Init 2 */

}

PUTCHAR_PROTOTYPE
{
  /* Place your implementation of fputc here */
  /* e.g. write a character to the LPUART1 and Loop until the end of transmission */
  HAL_UART_Transmit(&huart4, (uint8_t *)&ch, 1, 0xFFFF);

  return ch;
}

/**
  * @brief UART4 Initialization Function
  *  None
  * @retval None
  */
static void MX_UART4_Init(void)
{

  /* USER CODE BEGIN UART4_Init 0 */

  /* USER CODE END UART4_Init 0 */

  /* USER CODE BEGIN UART4_Init 1 */

  /* USER CODE END UART4_Init 1 */
  huart4.Instance = UART4;
  huart4.Init.BaudRate = 115200;
  huart4.Init.WordLength = UART_WORDLENGTH_8B;
  huart4.Init.StopBits = UART_STOPBITS_1;
  huart4.Init.Parity = UART_PARITY_NONE;
  huart4.Init.Mode = UART_MODE_TX_RX;
  huart4.Init.HwFlowCtl = UART_HWCONTROL_NONE;
  huart4.Init.OverSampling = UART_OVERSAMPLING_16;
  huart4.Init.OneBitSampling = UART_ONE_BIT_SAMPLE_DISABLE;
  huart4.Init.ClockPrescaler = UART_PRESCALER_DIV1;
  huart4.AdvancedInit.AdvFeatureInit = UART_ADVFEATURE_NO_INIT;
  if (HAL_UART_Init(&huart4) != HAL_OK)
  {
    Error_Handler();
  }
  if (HAL_UARTEx_SetTxFifoThreshold(&huart4, UART_TXFIFO_THRESHOLD_1_8) != HAL_OK)
  {
    Error_Handler();
  }
  if (HAL_UARTEx_SetRxFifoThreshold(&huart4, UART_RXFIFO_THRESHOLD_1_8) != HAL_OK)
  {
    Error_Handler();
  }
  if (HAL_UARTEx_DisableFifoMode(&huart4) != HAL_OK)
  {
    Error_Handler();
  }
  /* USER CODE BEGIN UART4_Init 2 */

  /* USER CODE END UART4_Init 2 */

}

/**
  * @brief UART7 Initialization Function
  *  None
  * @retval None
  */
static void MX_UART7_Init(void)
{

  /* USER CODE BEGIN UART7_Init 0 */

  /* USER CODE END UART7_Init 0 */

  /* USER CODE BEGIN UART7_Init 1 */

  /* USER CODE END UART7_Init 1 */
  huart7.Instance = UART7;
  huart7.Init.BaudRate = 115200;
  huart7.Init.WordLength = UART_WORDLENGTH_8B;
  huart7.Init.StopBits = UART_STOPBITS_1;
  huart7.Init.Parity = UART_PARITY_NONE;
  huart7.Init.Mode = UART_MODE_TX_RX;
  huart7.Init.HwFlowCtl = UART_HWCONTROL_NONE;
  huart7.Init.OverSampling = UART_OVERSAMPLING_16;
  huart7.Init.OneBitSampling = UART_ONE_BIT_SAMPLE_DISABLE;
  huart7.Init.ClockPrescaler = UART_PRESCALER_DIV1;
  huart7.AdvancedInit.AdvFeatureInit = UART_ADVFEATURE_NO_INIT;
  if (HAL_UART_Init(&huart7) != HAL_OK)
  {
    Error_Handler();
  }
  if (HAL_UARTEx_SetTxFifoThreshold(&huart7, UART_TXFIFO_THRESHOLD_1_8) != HAL_OK)
  {
    Error_Handler();
  }
  if (HAL_UARTEx_SetRxFifoThreshold(&huart7, UART_RXFIFO_THRESHOLD_1_8) != HAL_OK)
  {
    Error_Handler();
  }
  if (HAL_UARTEx_DisableFifoMode(&huart7) != HAL_OK)
  {
    Error_Handler();
  }
  /* USER CODE BEGIN UART7_Init 2 */

  /* USER CODE END UART7_Init 2 */

}

/**
  * @brief GPIO Initialization Function
  *  None
  * @retval None
  */
static void MX_GPIO_Init(void)
{
/* USER CODE BEGIN MX_GPIO_Init_1 */
/* USER CODE END MX_GPIO_Init_1 */

  /* GPIO Ports Clock Enable */
  __HAL_RCC_GPIOD_CLK_ENABLE();
  __HAL_RCC_GPIOE_CLK_ENABLE();

/* USER CODE BEGIN MX_GPIO_Init_2 */
/* USER CODE END MX_GPIO_Init_2 */
}

/* 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 */
  __disable_irq();
  while (1)
  {
  }
  /* 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.
  *   file: pointer to the source file name
  *   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,
     ex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */
  /* USER CODE END 6 */
}
#endif /* USE_FULL_ASSERT */

[gbm]

Call Receive_IT before calling Transmit as a temporary solution.

Note that Receive_IT is waiting for exactly 20 characters - not necessarily what you need.

[Karl Yamashita]

It's been over a year, but if I remember, someone posted an issue with UART7 not interrupting. So I tested on a Nucleo-H723 and Lo and behold, UART7 would not interrupt.

Maybe try one last thing, set to receive 1 byte instead of 36 to see if the callback is called.

[Tesla DeLorean]

If you can fish that out of the system, or any other hints / recollections about the issue / post, that would be great

I don't see anything in the errata

https://www.st.com/resource/en/errata_sheet/es0392-stm32h742xig-stm32h743xig-stm32h750xb-stm32h753xi-device-errata-stmicroelectronics.pdf

https://www.st.com/resource/en/errata_sheet/es0491-stm32h72xx73xx-device-errata-stmicroelectronics.pdf