Can't receive data on UART7 in STM32H7S78-DK while using UART4

Mehulrana511 · ‎2025-01-21

Hello,

I am using the STM32H7S78-DK board and STM32CubeIDE for development. In my application, I am working with UART communication between UART4 and UART7.

Objective:

I am sending data from UART4 (connected to the Virtual COM port on the board).
The data is transmitted from UART4 to UART7.
After sending the data, I expect a response from UART7, but I am unable to receive it.

Steps I Follow:

Initially, I used the HAL_UART_Receive_IT function for UART7 reception. However, upon reviewing several posts and technical documents, I realized that HAL_UART_Receive_IT is only suitable for known-length data and not for unknown-length data.
Based on the reference example provided here, I implemented HAL_UARTEx_ReceiveToIdle_IT for idle-line detection.

Issue Faced:

Despite implementing HAL_UARTEx_ReceiveToIdle_IT, I am still unable to receive any response from UART7.

Here is my code for reference,

/* USER CODE BEGIN PV */
#define RX_BUFFER_SIZE      20
#define RX_BUFFER_SIZE_7    50

uint8_t rxBuffer[RX_BUFFER_SIZE] = {0}; // Buffer to store received data
uint8_t rxBuffer7[RX_BUFFER_SIZE_7] = {0}; // Buffer to store received data


osThreadId_t uartTaskHandle;
const osThreadAttr_t uartTask_attributes =
{
    .name = "uartTask",
    .priority = (osPriority_t)osPriorityNormal,
    .stack_size = 512 * 4,
};

void UART_Print(const char* message)
{
   // Transmit the string data over UART
   HAL_UART_Transmit(&huart4, (uint8_t*)message, strlen(message), HAL_MAX_DELAY);
}


void SendDataOnUART7(uint8_t *pData)
{
	uint8_t TxData[20];

	uint16_t length = (uint16_t)pData[0];

	memcpy(TxData, &pData[1],length);

	// Transmit the string data over UART
	HAL_UART_Transmit(&huart7,TxData, length, HAL_MAX_DELAY);
}


void HAL_UARTEx_RxEventCallback(UART_HandleTypeDef *huart, uint16_t Size)
{
	if (huart->Instance == huart7.Instance)
	{
		// Transmit the string data over UART
		printf("Received data on uart7: %s\n\r", rxBuffer7);

		HAL_UARTEx_ReceiveToIdle_IT(&huart7, rxBuffer7, RX_BUFFER_SIZE_7);
	}
}


void HAL_UART_RxCpltCallback(UART_HandleTypeDef *huart)
{
	if (huart->Instance == huart4.Instance)
	{
		// Print received message
		printf("Received: %s\n\r", rxBuffer);

		SendDataOnUART7(rxBuffer);

		memset(rxBuffer, 0, RX_BUFFER_SIZE);

		// Re-enable UART interrupt for the full buffer to receive more data
		HAL_UART_Receive_IT(&huart4, rxBuffer, RX_BUFFER_SIZE);
	}

}


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

  /* USER CODE BEGIN 1 */

  /* USER CODE END 1 */

  /* MPU Configuration--------------------------------------------------------*/
  MPU_Config();

  /* Enable the CPU Cache */

  /* Enable I-Cache---------------------------------------------------------*/
  SCB_EnableICache();

  /* Enable D-Cache---------------------------------------------------------*/
  SCB_EnableDCache();

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

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

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


  MX_GPIO_Init();
  MX_HPDMA1_Init();
  MX_LTDC_Init();
  MX_CRC_Init();
  MX_DMA2D_Init();
  MX_JPEG_Init();
  MX_FLASH_Init();
  MX_I2C1_Init();
  MX_GPU2D_Init();
  MX_ICACHE_GPU2D_Init();
  MX_UART4_Init();
  MX_UART7_Init();
  
  UART_Print("Start...TouchGFX...Project\n\r");
  printf("Hello_STM32H7S78-DK!\n\r");

  /* Enable UART4 interrupt mode */
  //Make sure that the data sent is exactly 20 bytes, as the RX_BUFFER_SIZE is set to 20. If the data is not 20 bytes, it will not work properly!
  HAL_UART_Receive_IT(&huart4, rxBuffer, RX_BUFFER_SIZE); 
  HAL_UARTEx_ReceiveToIdle_IT(&huart7, rxBuffer7, RX_BUFFER_SIZE_7);


  MX_TouchGFX_Init();
  /* Call PreOsInit function */
  MX_TouchGFX_PreOSInit();

  osKernelInitialize();

  defaultTaskHandle = osThreadNew(StartDefaultTask, NULL, &defaultTask_attributes);

  /* creation of TouchGFXTask */
  TouchGFXTaskHandle = osThreadNew(TouchGFX_Task, NULL, &TouchGFXTask_attributes);

  uartTaskHandle = osThreadNew(UART_Task, NULL, &uartTask_attributes);


  /* Start scheduler */
  osKernelStart();

  while (1)
  {

  }
  /* USER CODE END 3 */
}

I would appreciate any guidance or example code to resolve this issue.

Best regards,
Mehul

Mehulrana511 · ‎2025-01-26

Hi @Andrew Neil ,

Thank you for your response!

We have identified the bug. The interrupt is being blocked due to the printf function, as it transmits data over UART4 at the same time when we receive an interrupt on UART7.

Here’s what I did to resolve it:

I am now sending the data (command) through Ethernet and transmitting this data over UART7. Once I get a response from UART7, I wait for one byte of data. Since I am unsure of the exact length of the received data, I treat the reception as complete when I encounter a '\n' character. After this, I send the data over Ethernet.

During this operation, I avoid using the printf function (on UART4). In other scenarios, I can continue using printf for debugging purposes.

Thank you once again for your help!

Best regards,
Mehul

View solution in original post

harshpanchal_6 · ‎2024-11-25

Hello Folks,

I am trying to establish the UART communication between STM32H7S78 and WIFI module EMA3080.

I am facing issue while transmitting, receiving and response of AT-commands from UART-7 to UART-4.

Please find the attached main.txt file and please share your suggestions.

Thank you,

Harsh

Peter BENSCH · ‎2024-11-25

There is no main.txt yet?

In order to give better visibility on the answered topics, please click on Accept as Solution on the reply which solved your issue or answered your question.

harshpanchal_6 · ‎2024-11-25

Peter BENSCH · ‎2024-11-25

It is easier to insert the source code using the </> button:

Logo
/* USER CODE BEGIN Header */
/**
  ******************************************************************************
  * @file           : main.c
  * @brief          : Main program body
  ******************************************************************************
  * @attention
  *
  * Copyright (c) 2024 STMicroelectronics.
  * All rights reserved.
  *
  * This software is licensed under terms that can be found in the LICENSE file
  * in the root directory of this software component.
  * If no LICENSE file comes with this software, it is provided AS-IS.
  *
  ******************************************************************************
  */
/* USER CODE END Header */
/* Includes ------------------------------------------------------------------*/
#include "main.h"
#include <stdio.h>
#include <string.h>
#include <stdbool.h>
char resp_buff[100];
char tx_buff[20];
char rx_buff[38];


/* 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 */

/* USER CODE END PD */

/* Private macro -------------------------------------------------------------*/
/* USER CODE BEGIN PM */

/* USER CODE END PM */

/* Private variables ---------------------------------------------------------*/

UART_HandleTypeDef huart4;
UART_HandleTypeDef huart7;

/* USER CODE BEGIN PV */

/* USER CODE END PV */

/* Private function prototypes -----------------------------------------------*/
static void MX_GPIO_Init(void);
static void MX_UART4_Init(void);
static void MX_UART7_Init(void);
/* USER CODE BEGIN PFP */
/* USER CODE END PFP */

/* Private user code ---------------------------------------------------------*/
/* USER CODE BEGIN 0 */
void sendATCommand(const char *command)
{
    strcpy((char *)tx_buff, command);


    HAL_UART_Transmit(&huart7, (uint8_t *)tx_buff, 9, 5000); // TX data from UART-7 [wifi module]

    HAL_UART_Receive(&huart4, (uint8_t *)rx_buff, 9, 5000);  // RX data on UART-4 [stm32h7 board]
        // Error_Handler();


    // Transmit received response to another UART
    //Verify mxchip response what we received st firmware
    HAL_UART_Transmit(&huart4, (uint8_t *)rx_buff, 9,  5000); // Response on UART-4 [stm32h7 board]
        // Error_Handler();

}
/* USER CODE END 0 */

/**
  * @brief  The application entry point.
  * @retval int
  */
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_UART4_Init();
  MX_UART7_Init();
  /* USER CODE BEGIN 2 */

  /* USER CODE END 2 */

  /* Infinite loop */
  /* USER CODE BEGIN WHILE */
  while (1)
  {
	  sendATCommand("AT+FWVER?");
  }
  /* USER CODE END 3 */
}

/**
  * @brief UART4 Initialization Function
  * @PAram 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
  * @PAram 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
  * @PAram None
  * @retval None
  */
static void MX_GPIO_Init(void)
{
  GPIO_InitTypeDef GPIO_InitStruct = {0};
/* USER CODE BEGIN MX_GPIO_Init_1 */
/* USER CODE END MX_GPIO_Init_1 */

  /* GPIO Ports Clock Enable */
  __HAL_RCC_GPIOE_CLK_ENABLE();
  __HAL_RCC_GPIOG_CLK_ENABLE();
  __HAL_RCC_GPIOM_CLK_ENABLE();
  __HAL_RCC_GPIOD_CLK_ENABLE();
  __HAL_RCC_GPIOB_CLK_ENABLE();
  __HAL_RCC_GPIOF_CLK_ENABLE();
  __HAL_RCC_GPIOC_CLK_ENABLE();
  __HAL_RCC_GPIOA_CLK_ENABLE();

  /*Configure GPIO pins : DCMI_D2_Pin DCMI_D3_Pin DCMI_D4_Pin */
  GPIO_InitStruct.Pin = DCMI_D2_Pin|DCMI_D3_Pin|DCMI_D4_Pin;
  GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
  GPIO_InitStruct.Pull = GPIO_NOPULL;
  GPIO_InitStruct.Alternate = GPIO_AF13_DCMIPP;
  HAL_GPIO_Init(GPIOE, &GPIO_InitStruct);

  /*Configure GPIO pin : DCMI_HSYNC_Pin */
  GPIO_InitStruct.Pin = DCMI_HSYNC_Pin;
  GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
  GPIO_InitStruct.Pull = GPIO_NOPULL;
  GPIO_InitStruct.Alternate = GPIO_AF5_DCMIPP;
  HAL_GPIO_Init(DCMI_HSYNC_GPIO_Port, &GPIO_InitStruct);

  /*Configure GPIO pins : USB2_FS_N_Pin USB2_FS_P_Pin */
  GPIO_InitStruct.Pin = USB2_FS_N_Pin|USB2_FS_P_Pin;
  GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
  GPIO_InitStruct.Pull = GPIO_NOPULL;
  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
  GPIO_InitStruct.Alternate = GPIO_AF10_OTG_FS;
  HAL_GPIO_Init(GPIOM, &GPIO_InitStruct);

  /*Configure GPIO pins : USB1_HS_P_Pin USB1_HS_N_Pin */
  GPIO_InitStruct.Pin = USB1_HS_P_Pin|USB1_HS_N_Pin;
  GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
  GPIO_InitStruct.Pull = GPIO_NOPULL;
  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
  GPIO_InitStruct.Alternate = GPIO_AF10_OTG_HS;
  HAL_GPIO_Init(GPIOM, &GPIO_InitStruct);

  /*Configure GPIO pin : DCMI_D5_Pin */
  GPIO_InitStruct.Pin = DCMI_D5_Pin;
  GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
  GPIO_InitStruct.Pull = GPIO_NOPULL;
  GPIO_InitStruct.Alternate = GPIO_AF13_DCMIPP;
  HAL_GPIO_Init(DCMI_D5_GPIO_Port, &GPIO_InitStruct);

  /*Configure GPIO pin : SD_CMD_Pin */
  GPIO_InitStruct.Pin = SD_CMD_Pin;
  GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
  GPIO_InitStruct.Pull = GPIO_NOPULL;
  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_VERY_HIGH;
  GPIO_InitStruct.Alternate = GPIO_AF11_SDMMC1;
  HAL_GPIO_Init(SD_CMD_GPIO_Port, &GPIO_InitStruct);

  /*Configure GPIO pins : DCMI_D6_Pin DCMI_VSYNC_Pin */
  GPIO_InitStruct.Pin = DCMI_D6_Pin|DCMI_VSYNC_Pin;
  GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
  GPIO_InitStruct.Pull = GPIO_NOPULL;
  GPIO_InitStruct.Alternate = GPIO_AF13_DCMIPP;
  HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);

  /*Configure GPIO pin : MIC_CK_Pin */
  GPIO_InitStruct.Pin = MIC_CK_Pin;
  GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
  GPIO_InitStruct.Pull = GPIO_NOPULL;
  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
  GPIO_InitStruct.Alternate = GPIO_AF1_ADF1;
  HAL_GPIO_Init(MIC_CK_GPIO_Port, &GPIO_InitStruct);

  /*Configure GPIO pin : I2S_SDO_Pin */
  GPIO_InitStruct.Pin = I2S_SDO_Pin;
  GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
  GPIO_InitStruct.Pull = GPIO_NOPULL;
  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
  GPIO_InitStruct.Alternate = GPIO_AF8_SPI6;
  HAL_GPIO_Init(I2S_SDO_GPIO_Port, &GPIO_InitStruct);

  /*Configure GPIO pin : LCD_RGB_R2_Pin */
  GPIO_InitStruct.Pin = LCD_RGB_R2_Pin;
  GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
  GPIO_InitStruct.Pull = GPIO_NOPULL;
  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
  GPIO_InitStruct.Alternate = GPIO_AF11_LTDC;
  HAL_GPIO_Init(LCD_RGB_R2_GPIO_Port, &GPIO_InitStruct);

  /*Configure GPIO pin : RMII_REF_CLK_Pin */
  GPIO_InitStruct.Pin = RMII_REF_CLK_Pin;
  GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
  GPIO_InitStruct.Pull = GPIO_NOPULL;
  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
  GPIO_InitStruct.Alternate = GPIO_AF4_ETH;
  HAL_GPIO_Init(RMII_REF_CLK_GPIO_Port, &GPIO_InitStruct);

  /*Configure GPIO pins : LCD_RGB_R7_Pin LCD_HSYNC_Pin LCD_RGB_R6_Pin LCD_RGB_B1_Pin
                           LCD_CLK_Pin */
  GPIO_InitStruct.Pin = LCD_RGB_R7_Pin|LCD_HSYNC_Pin|LCD_RGB_R6_Pin|LCD_RGB_B1_Pin
                          |LCD_CLK_Pin;
  GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
  GPIO_InitStruct.Pull = GPIO_NOPULL;
  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
  GPIO_InitStruct.Alternate = GPIO_AF13_LTDC;
  HAL_GPIO_Init(GPIOG, &GPIO_InitStruct);

  /*Configure GPIO pins : SPI_MISO_Pin SPI_MOSI_Pin SPI_CLK_Pin */
  GPIO_InitStruct.Pin = SPI_MISO_Pin|SPI_MOSI_Pin|SPI_CLK_Pin;
  GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
  GPIO_InitStruct.Pull = GPIO_NOPULL;
  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
  GPIO_InitStruct.Alternate = GPIO_AF5_SPI4;
  HAL_GPIO_Init(GPIOE, &GPIO_InitStruct);

  /*Configure GPIO pin : SD_D2_Pin */
  GPIO_InitStruct.Pin = SD_D2_Pin;
  GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
  GPIO_InitStruct.Pull = GPIO_NOPULL;
  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_VERY_HIGH;
  GPIO_InitStruct.Alternate = GPIO_AF12_SDMMC1;
  HAL_GPIO_Init(SD_D2_GPIO_Port, &GPIO_InitStruct);

  /*Configure GPIO pins : SD_D3_Pin SD_CK_Pin SD_D0_Pin SD_D1_Pin */
  GPIO_InitStruct.Pin = SD_D3_Pin|SD_CK_Pin|SD_D0_Pin|SD_D1_Pin;
  GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
  GPIO_InitStruct.Pull = GPIO_NOPULL;
  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_VERY_HIGH;
  GPIO_InitStruct.Alternate = GPIO_AF11_SDMMC1;
  HAL_GPIO_Init(GPIOC, &GPIO_InitStruct);

  /*Configure GPIO pins : I2C1_I3C_SDA_Pin I2C1_I3C_SCL_Pin */
  GPIO_InitStruct.Pin = I2C1_I3C_SDA_Pin|I2C1_I3C_SCL_Pin;
  GPIO_InitStruct.Mode = GPIO_MODE_AF_OD;
  GPIO_InitStruct.Pull = GPIO_NOPULL;
  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
  GPIO_InitStruct.Alternate = GPIO_AF4_I2C1;
  HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);

  /*Configure GPIO pins : LCD_RGB_R4_Pin LCD_RGB_R3_Pin LCD_RGB_G5_Pin LCD_DE_Pin
                           LCD_RGB_G6_Pin */
  GPIO_InitStruct.Pin = LCD_RGB_R4_Pin|LCD_RGB_R3_Pin|LCD_RGB_G5_Pin|LCD_DE_Pin
                          |LCD_RGB_G6_Pin;
  GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
  GPIO_InitStruct.Pull = GPIO_NOPULL;
  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
  GPIO_InitStruct.Alternate = GPIO_AF13_LTDC;
  HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);

  /*Configure GPIO pins : UCPD1_CC2_Pin UCPD1_CC1_Pin */
  GPIO_InitStruct.Pin = UCPD1_CC2_Pin|UCPD1_CC1_Pin;
  GPIO_InitStruct.Mode = GPIO_MODE_ANALOG;
  GPIO_InitStruct.Pull = GPIO_NOPULL;
  HAL_GPIO_Init(GPIOM, &GPIO_InitStruct);

  /*Configure GPIO pin : LCD_VSYNC_Pin */
  GPIO_InitStruct.Pin = LCD_VSYNC_Pin;
  GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
  GPIO_InitStruct.Pull = GPIO_NOPULL;
  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
  GPIO_InitStruct.Alternate = GPIO_AF11_LTDC;
  HAL_GPIO_Init(LCD_VSYNC_GPIO_Port, &GPIO_InitStruct);

  /*Configure GPIO pins : LCD_RGB_B2_Pin LCD_RGB_B3_Pin LCD_RGB_B6_Pin LCD_RGB_R5_Pin
                           LCD_RGB_G3_Pin LCD_RGB_G2_Pin */
  GPIO_InitStruct.Pin = LCD_RGB_B2_Pin|LCD_RGB_B3_Pin|LCD_RGB_B6_Pin|LCD_RGB_R5_Pin
                          |LCD_RGB_G3_Pin|LCD_RGB_G2_Pin;
  GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
  GPIO_InitStruct.Pull = GPIO_NOPULL;
  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
  GPIO_InitStruct.Alternate = GPIO_AF13_LTDC;
  HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);

  /*Configure GPIO pins : DCMI_PIXCLK_Pin DCMI_D7_Pin */
  GPIO_InitStruct.Pin = DCMI_PIXCLK_Pin|DCMI_D7_Pin;
  GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
  GPIO_InitStruct.Pull = GPIO_NOPULL;
  GPIO_InitStruct.Alternate = GPIO_AF5_DCMIPP;
  HAL_GPIO_Init(GPIOD, &GPIO_InitStruct);

  /*Configure GPIO pins : LCD_RGB_B5_Pin LCD_RGB_B4_Pin */
  GPIO_InitStruct.Pin = LCD_RGB_B5_Pin|LCD_RGB_B4_Pin;
  GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
  GPIO_InitStruct.Pull = GPIO_NOPULL;
  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
  GPIO_InitStruct.Alternate = GPIO_AF14_LTDC;
  HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);

  /*Configure GPIO pins : DCMI_D0_Pin DCMI_D1_Pin */
  GPIO_InitStruct.Pin = DCMI_D0_Pin|DCMI_D1_Pin;
  GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
  GPIO_InitStruct.Pull = GPIO_NOPULL;
  GPIO_InitStruct.Alternate = GPIO_AF13_DCMIPP;
  HAL_GPIO_Init(GPIOC, &GPIO_InitStruct);

  /*Configure GPIO pin : I2S_SDI_Pin */
  GPIO_InitStruct.Pin = I2S_SDI_Pin;
  GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
  GPIO_InitStruct.Pull = GPIO_NOPULL;
  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
  GPIO_InitStruct.Alternate = GPIO_AF5_SPI6;
  HAL_GPIO_Init(I2S_SDI_GPIO_Port, &GPIO_InitStruct);

  /*Configure GPIO pin : RMII_TX_EN_Pin */
  GPIO_InitStruct.Pin = RMII_TX_EN_Pin;
  GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
  GPIO_InitStruct.Pull = GPIO_NOPULL;
  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
  GPIO_InitStruct.Alternate = GPIO_AF11_ETH;
  HAL_GPIO_Init(RMII_TX_EN_GPIO_Port, &GPIO_InitStruct);

  /*Configure GPIO pins : LCD_RGB_G0_Pin LCD_RGB_R0_Pin LCD_RGB_G1_Pin */
  GPIO_InitStruct.Pin = LCD_RGB_G0_Pin|LCD_RGB_R0_Pin|LCD_RGB_G1_Pin;
  GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
  GPIO_InitStruct.Pull = GPIO_NOPULL;
  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
  GPIO_InitStruct.Alternate = GPIO_AF13_LTDC;
  HAL_GPIO_Init(GPIOF, &GPIO_InitStruct);

  /*Configure GPIO pins : LCD_RGB_R1_Pin LCD_RGB_B0_Pin */
  GPIO_InitStruct.Pin = LCD_RGB_R1_Pin|LCD_RGB_B0_Pin;
  GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
  GPIO_InitStruct.Pull = GPIO_NOPULL;
  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
  GPIO_InitStruct.Alternate = GPIO_AF14_LTDC;
  HAL_GPIO_Init(GPIOF, &GPIO_InitStruct);

  /*Configure GPIO pins : RMII_MDC_Pin RMII_RXD0_Pin RMII_RXD1_Pin */
  GPIO_InitStruct.Pin = RMII_MDC_Pin|RMII_RXD0_Pin|RMII_RXD1_Pin;
  GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
  GPIO_InitStruct.Pull = GPIO_NOPULL;
  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
  GPIO_InitStruct.Alternate = GPIO_AF11_ETH;
  HAL_GPIO_Init(GPIOC, &GPIO_InitStruct);

  /*Configure GPIO pins : RMII_MDIO_Pin RMII_CRS_DV_Pin */
  GPIO_InitStruct.Pin = RMII_MDIO_Pin|RMII_CRS_DV_Pin;
  GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
  GPIO_InitStruct.Pull = GPIO_NOPULL;
  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
  GPIO_InitStruct.Alternate = GPIO_AF11_ETH;
  HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);

  /*Configure GPIO pins : I2S_WS_Pin I2S_CK_Pin */
  GPIO_InitStruct.Pin = I2S_WS_Pin|I2S_CK_Pin;
  GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
  GPIO_InitStruct.Pull = GPIO_NOPULL;
  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
  GPIO_InitStruct.Alternate = GPIO_AF8_SPI6;
  HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);

  /*Configure GPIO pins : LCD_RGB_G7_Pin LCD_RGB_G4_Pin */
  GPIO_InitStruct.Pin = LCD_RGB_G7_Pin|LCD_RGB_G4_Pin;
  GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
  GPIO_InitStruct.Pull = GPIO_NOPULL;
  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
  GPIO_InitStruct.Alternate = GPIO_AF10_LTDC;
  HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);

  /*Configure GPIO pin : I2S_MCK_Pin */
  GPIO_InitStruct.Pin = I2S_MCK_Pin;
  GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
  GPIO_InitStruct.Pull = GPIO_NOPULL;
  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
  GPIO_InitStruct.Alternate = GPIO_AF5_SPI6;
  HAL_GPIO_Init(I2S_MCK_GPIO_Port, &GPIO_InitStruct);

  /*Configure GPIO pin : LCD_RGB_B7_Pin */
  GPIO_InitStruct.Pin = LCD_RGB_B7_Pin;
  GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
  GPIO_InitStruct.Pull = GPIO_NOPULL;
  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
  GPIO_InitStruct.Alternate = GPIO_AF12_LTDC;
  HAL_GPIO_Init(LCD_RGB_B7_GPIO_Port, &GPIO_InitStruct);

  /*Configure GPIO pins : RMII_TXD0_Pin RMII_RX_ER_Pin RMII_TXD1_Pin */
  GPIO_InitStruct.Pin = RMII_TXD0_Pin|RMII_RX_ER_Pin|RMII_TXD1_Pin;
  GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
  GPIO_InitStruct.Pull = GPIO_NOPULL;
  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
  GPIO_InitStruct.Alternate = GPIO_AF11_ETH;
  HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);

  /*Configure GPIO pins : UCPD1_VSENSE_Pin UCPD1_ISENSE_Pin */
  GPIO_InitStruct.Pin = UCPD1_VSENSE_Pin|UCPD1_ISENSE_Pin;
  GPIO_InitStruct.Mode = GPIO_MODE_ANALOG;
  GPIO_InitStruct.Pull = GPIO_NOPULL;
  HAL_GPIO_Init(GPIOF, &GPIO_InitStruct);

/* 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.
  * @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,
     ex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */
  /* USER CODE END 6 */
}
#endif /* USE_FULL_ASSERT */

In order to give better visibility on the answered topics, please click on Accept as Solution on the reply which solved your issue or answered your question.

harshpanchal_6 · ‎2024-11-25

/* USER CODE BEGIN Header */
/**
  ******************************************************************************
  * @file           : main.c
  * @brief          : Main program body
  ******************************************************************************
  * @attention
  *
  * Copyright (c) 2024 STMicroelectronics.
  * All rights reserved.
  *
  * This software is licensed under terms that can be found in the LICENSE file
  * in the root directory of this software component.
  * If no LICENSE file comes with this software, it is provided AS-IS.
  *
  ******************************************************************************
  */
/* USER CODE END Header */
/* Includes ------------------------------------------------------------------*/
#include "main.h"
#include <stdio.h>
#include <string.h>
#include <stdbool.h>
char resp_buff[100];
char tx_buff[20];
char rx_buff[38];


/* 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 */

/* USER CODE END PD */

/* Private macro -------------------------------------------------------------*/
/* USER CODE BEGIN PM */

/* USER CODE END PM */

/* Private variables ---------------------------------------------------------*/

UART_HandleTypeDef huart4;
UART_HandleTypeDef huart7;

/* USER CODE BEGIN PV */

/* USER CODE END PV */

/* Private function prototypes -----------------------------------------------*/
static void MX_GPIO_Init(void);
static void MX_UART4_Init(void);
static void MX_UART7_Init(void);
/* USER CODE BEGIN PFP */
/* USER CODE END PFP */

/* Private user code ---------------------------------------------------------*/
/* USER CODE BEGIN 0 */
void sendATCommand(const char *command)
{
    strcpy((char *)tx_buff, command);


    HAL_UART_Transmit(&huart7, (uint8_t *)tx_buff, 9, 5000); // TX data from UART-7 [wifi module]

    HAL_UART_Receive(&huart4, (uint8_t *)rx_buff, 9, 5000);  // RX data on UART-4 [stm32h7 board]
        // Error_Handler();


    // Transmit received response to another UART
    //Verify mxchip response what we received st firmware
    HAL_UART_Transmit(&huart4, (uint8_t *)rx_buff, 9,  5000); // Response on UART-4 [stm32h7 board]
        // Error_Handler();

}
/* USER CODE END 0 */

/**
  * @brief  The application entry point.
  * @retval int
  */
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_UART4_Init();
  MX_UART7_Init();
  /* USER CODE BEGIN 2 */

  /* USER CODE END 2 */

  /* Infinite loop */
  /* USER CODE BEGIN WHILE */
  while (1)
  {
	  sendATCommand("AT+FWVER?");
  }
  /* USER CODE END 3 */
}

/**
  * @brief UART4 Initialization Function
  * @PAram 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
  * @PAram 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
  * @PAram None
  * @retval None
  */
static void MX_GPIO_Init(void)
{
  GPIO_InitTypeDef GPIO_InitStruct = {0};
/* USER CODE BEGIN MX_GPIO_Init_1 */
/* USER CODE END MX_GPIO_Init_1 */

  /* GPIO Ports Clock Enable */
  __HAL_RCC_GPIOE_CLK_ENABLE();
  __HAL_RCC_GPIOG_CLK_ENABLE();
  __HAL_RCC_GPIOM_CLK_ENABLE();
  __HAL_RCC_GPIOD_CLK_ENABLE();
  __HAL_RCC_GPIOB_CLK_ENABLE();
  __HAL_RCC_GPIOF_CLK_ENABLE();
  __HAL_RCC_GPIOC_CLK_ENABLE();
  __HAL_RCC_GPIOA_CLK_ENABLE();

  /*Configure GPIO pins : DCMI_D2_Pin DCMI_D3_Pin DCMI_D4_Pin */
  GPIO_InitStruct.Pin = DCMI_D2_Pin|DCMI_D3_Pin|DCMI_D4_Pin;
  GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
  GPIO_InitStruct.Pull = GPIO_NOPULL;
  GPIO_InitStruct.Alternate = GPIO_AF13_DCMIPP;
  HAL_GPIO_Init(GPIOE, &GPIO_InitStruct);

  /*Configure GPIO pin : DCMI_HSYNC_Pin */
  GPIO_InitStruct.Pin = DCMI_HSYNC_Pin;
  GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
  GPIO_InitStruct.Pull = GPIO_NOPULL;
  GPIO_InitStruct.Alternate = GPIO_AF5_DCMIPP;
  HAL_GPIO_Init(DCMI_HSYNC_GPIO_Port, &GPIO_InitStruct);

  /*Configure GPIO pins : USB2_FS_N_Pin USB2_FS_P_Pin */
  GPIO_InitStruct.Pin = USB2_FS_N_Pin|USB2_FS_P_Pin;
  GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
  GPIO_InitStruct.Pull = GPIO_NOPULL;
  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
  GPIO_InitStruct.Alternate = GPIO_AF10_OTG_FS;
  HAL_GPIO_Init(GPIOM, &GPIO_InitStruct);

  /*Configure GPIO pins : USB1_HS_P_Pin USB1_HS_N_Pin */
  GPIO_InitStruct.Pin = USB1_HS_P_Pin|USB1_HS_N_Pin;
  GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
  GPIO_InitStruct.Pull = GPIO_NOPULL;
  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
  GPIO_InitStruct.Alternate = GPIO_AF10_OTG_HS;
  HAL_GPIO_Init(GPIOM, &GPIO_InitStruct);

  /*Configure GPIO pin : DCMI_D5_Pin */
  GPIO_InitStruct.Pin = DCMI_D5_Pin;
  GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
  GPIO_InitStruct.Pull = GPIO_NOPULL;
  GPIO_InitStruct.Alternate = GPIO_AF13_DCMIPP;
  HAL_GPIO_Init(DCMI_D5_GPIO_Port, &GPIO_InitStruct);

  /*Configure GPIO pin : SD_CMD_Pin */
  GPIO_InitStruct.Pin = SD_CMD_Pin;
  GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
  GPIO_InitStruct.Pull = GPIO_NOPULL;
  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_VERY_HIGH;
  GPIO_InitStruct.Alternate = GPIO_AF11_SDMMC1;
  HAL_GPIO_Init(SD_CMD_GPIO_Port, &GPIO_InitStruct);

  /*Configure GPIO pins : DCMI_D6_Pin DCMI_VSYNC_Pin */
  GPIO_InitStruct.Pin = DCMI_D6_Pin|DCMI_VSYNC_Pin;
  GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
  GPIO_InitStruct.Pull = GPIO_NOPULL;
  GPIO_InitStruct.Alternate = GPIO_AF13_DCMIPP;
  HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);

  /*Configure GPIO pin : MIC_CK_Pin */
  GPIO_InitStruct.Pin = MIC_CK_Pin;
  GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
  GPIO_InitStruct.Pull = GPIO_NOPULL;
  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
  GPIO_InitStruct.Alternate = GPIO_AF1_ADF1;
  HAL_GPIO_Init(MIC_CK_GPIO_Port, &GPIO_InitStruct);

  /*Configure GPIO pin : I2S_SDO_Pin */
  GPIO_InitStruct.Pin = I2S_SDO_Pin;
  GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
  GPIO_InitStruct.Pull = GPIO_NOPULL;
  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
  GPIO_InitStruct.Alternate = GPIO_AF8_SPI6;
  HAL_GPIO_Init(I2S_SDO_GPIO_Port, &GPIO_InitStruct);

  /*Configure GPIO pin : LCD_RGB_R2_Pin */
  GPIO_InitStruct.Pin = LCD_RGB_R2_Pin;
  GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
  GPIO_InitStruct.Pull = GPIO_NOPULL;
  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
  GPIO_InitStruct.Alternate = GPIO_AF11_LTDC;
  HAL_GPIO_Init(LCD_RGB_R2_GPIO_Port, &GPIO_InitStruct);

  /*Configure GPIO pin : RMII_REF_CLK_Pin */
  GPIO_InitStruct.Pin = RMII_REF_CLK_Pin;
  GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
  GPIO_InitStruct.Pull = GPIO_NOPULL;
  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
  GPIO_InitStruct.Alternate = GPIO_AF4_ETH;
  HAL_GPIO_Init(RMII_REF_CLK_GPIO_Port, &GPIO_InitStruct);

  /*Configure GPIO pins : LCD_RGB_R7_Pin LCD_HSYNC_Pin LCD_RGB_R6_Pin LCD_RGB_B1_Pin
                           LCD_CLK_Pin */
  GPIO_InitStruct.Pin = LCD_RGB_R7_Pin|LCD_HSYNC_Pin|LCD_RGB_R6_Pin|LCD_RGB_B1_Pin
                          |LCD_CLK_Pin;
  GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
  GPIO_InitStruct.Pull = GPIO_NOPULL;
  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
  GPIO_InitStruct.Alternate = GPIO_AF13_LTDC;
  HAL_GPIO_Init(GPIOG, &GPIO_InitStruct);

  /*Configure GPIO pins : SPI_MISO_Pin SPI_MOSI_Pin SPI_CLK_Pin */
  GPIO_InitStruct.Pin = SPI_MISO_Pin|SPI_MOSI_Pin|SPI_CLK_Pin;
  GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
  GPIO_InitStruct.Pull = GPIO_NOPULL;
  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
  GPIO_InitStruct.Alternate = GPIO_AF5_SPI4;
  HAL_GPIO_Init(GPIOE, &GPIO_InitStruct);

  /*Configure GPIO pin : SD_D2_Pin */
  GPIO_InitStruct.Pin = SD_D2_Pin;
  GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
  GPIO_InitStruct.Pull = GPIO_NOPULL;
  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_VERY_HIGH;
  GPIO_InitStruct.Alternate = GPIO_AF12_SDMMC1;
  HAL_GPIO_Init(SD_D2_GPIO_Port, &GPIO_InitStruct);

  /*Configure GPIO pins : SD_D3_Pin SD_CK_Pin SD_D0_Pin SD_D1_Pin */
  GPIO_InitStruct.Pin = SD_D3_Pin|SD_CK_Pin|SD_D0_Pin|SD_D1_Pin;
  GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
  GPIO_InitStruct.Pull = GPIO_NOPULL;
  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_VERY_HIGH;
  GPIO_InitStruct.Alternate = GPIO_AF11_SDMMC1;
  HAL_GPIO_Init(GPIOC, &GPIO_InitStruct);

  /*Configure GPIO pins : I2C1_I3C_SDA_Pin I2C1_I3C_SCL_Pin */
  GPIO_InitStruct.Pin = I2C1_I3C_SDA_Pin|I2C1_I3C_SCL_Pin;
  GPIO_InitStruct.Mode = GPIO_MODE_AF_OD;
  GPIO_InitStruct.Pull = GPIO_NOPULL;
  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
  GPIO_InitStruct.Alternate = GPIO_AF4_I2C1;
  HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);

  /*Configure GPIO pins : LCD_RGB_R4_Pin LCD_RGB_R3_Pin LCD_RGB_G5_Pin LCD_DE_Pin
                           LCD_RGB_G6_Pin */
  GPIO_InitStruct.Pin = LCD_RGB_R4_Pin|LCD_RGB_R3_Pin|LCD_RGB_G5_Pin|LCD_DE_Pin
                          |LCD_RGB_G6_Pin;
  GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
  GPIO_InitStruct.Pull = GPIO_NOPULL;
  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
  GPIO_InitStruct.Alternate = GPIO_AF13_LTDC;
  HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);

  /*Configure GPIO pins : UCPD1_CC2_Pin UCPD1_CC1_Pin */
  GPIO_InitStruct.Pin = UCPD1_CC2_Pin|UCPD1_CC1_Pin;
  GPIO_InitStruct.Mode = GPIO_MODE_ANALOG;
  GPIO_InitStruct.Pull = GPIO_NOPULL;
  HAL_GPIO_Init(GPIOM, &GPIO_InitStruct);

  /*Configure GPIO pin : LCD_VSYNC_Pin */
  GPIO_InitStruct.Pin = LCD_VSYNC_Pin;
  GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
  GPIO_InitStruct.Pull = GPIO_NOPULL;
  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
  GPIO_InitStruct.Alternate = GPIO_AF11_LTDC;
  HAL_GPIO_Init(LCD_VSYNC_GPIO_Port, &GPIO_InitStruct);

  /*Configure GPIO pins : LCD_RGB_B2_Pin LCD_RGB_B3_Pin LCD_RGB_B6_Pin LCD_RGB_R5_Pin
                           LCD_RGB_G3_Pin LCD_RGB_G2_Pin */
  GPIO_InitStruct.Pin = LCD_RGB_B2_Pin|LCD_RGB_B3_Pin|LCD_RGB_B6_Pin|LCD_RGB_R5_Pin
                          |LCD_RGB_G3_Pin|LCD_RGB_G2_Pin;
  GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
  GPIO_InitStruct.Pull = GPIO_NOPULL;
  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
  GPIO_InitStruct.Alternate = GPIO_AF13_LTDC;
  HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);

  /*Configure GPIO pins : DCMI_PIXCLK_Pin DCMI_D7_Pin */
  GPIO_InitStruct.Pin = DCMI_PIXCLK_Pin|DCMI_D7_Pin;
  GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
  GPIO_InitStruct.Pull = GPIO_NOPULL;
  GPIO_InitStruct.Alternate = GPIO_AF5_DCMIPP;
  HAL_GPIO_Init(GPIOD, &GPIO_InitStruct);

  /*Configure GPIO pins : LCD_RGB_B5_Pin LCD_RGB_B4_Pin */
  GPIO_InitStruct.Pin = LCD_RGB_B5_Pin|LCD_RGB_B4_Pin;
  GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
  GPIO_InitStruct.Pull = GPIO_NOPULL;
  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
  GPIO_InitStruct.Alternate = GPIO_AF14_LTDC;
  HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);

  /*Configure GPIO pins : DCMI_D0_Pin DCMI_D1_Pin */
  GPIO_InitStruct.Pin = DCMI_D0_Pin|DCMI_D1_Pin;
  GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
  GPIO_InitStruct.Pull = GPIO_NOPULL;
  GPIO_InitStruct.Alternate = GPIO_AF13_DCMIPP;
  HAL_GPIO_Init(GPIOC, &GPIO_InitStruct);

  /*Configure GPIO pin : I2S_SDI_Pin */
  GPIO_InitStruct.Pin = I2S_SDI_Pin;
  GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
  GPIO_InitStruct.Pull = GPIO_NOPULL;
  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
  GPIO_InitStruct.Alternate = GPIO_AF5_SPI6;
  HAL_GPIO_Init(I2S_SDI_GPIO_Port, &GPIO_InitStruct);

  /*Configure GPIO pin : RMII_TX_EN_Pin */
  GPIO_InitStruct.Pin = RMII_TX_EN_Pin;
  GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
  GPIO_InitStruct.Pull = GPIO_NOPULL;
  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
  GPIO_InitStruct.Alternate = GPIO_AF11_ETH;
  HAL_GPIO_Init(RMII_TX_EN_GPIO_Port, &GPIO_InitStruct);

  /*Configure GPIO pins : LCD_RGB_G0_Pin LCD_RGB_R0_Pin LCD_RGB_G1_Pin */
  GPIO_InitStruct.Pin = LCD_RGB_G0_Pin|LCD_RGB_R0_Pin|LCD_RGB_G1_Pin;
  GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
  GPIO_InitStruct.Pull = GPIO_NOPULL;
  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
  GPIO_InitStruct.Alternate = GPIO_AF13_LTDC;
  HAL_GPIO_Init(GPIOF, &GPIO_InitStruct);

  /*Configure GPIO pins : LCD_RGB_R1_Pin LCD_RGB_B0_Pin */
  GPIO_InitStruct.Pin = LCD_RGB_R1_Pin|LCD_RGB_B0_Pin;
  GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
  GPIO_InitStruct.Pull = GPIO_NOPULL;
  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
  GPIO_InitStruct.Alternate = GPIO_AF14_LTDC;
  HAL_GPIO_Init(GPIOF, &GPIO_InitStruct);

  /*Configure GPIO pins : RMII_MDC_Pin RMII_RXD0_Pin RMII_RXD1_Pin */
  GPIO_InitStruct.Pin = RMII_MDC_Pin|RMII_RXD0_Pin|RMII_RXD1_Pin;
  GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
  GPIO_InitStruct.Pull = GPIO_NOPULL;
  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
  GPIO_InitStruct.Alternate = GPIO_AF11_ETH;
  HAL_GPIO_Init(GPIOC, &GPIO_InitStruct);

  /*Configure GPIO pins : RMII_MDIO_Pin RMII_CRS_DV_Pin */
  GPIO_InitStruct.Pin = RMII_MDIO_Pin|RMII_CRS_DV_Pin;
  GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
  GPIO_InitStruct.Pull = GPIO_NOPULL;
  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
  GPIO_InitStruct.Alternate = GPIO_AF11_ETH;
  HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);

  /*Configure GPIO pins : I2S_WS_Pin I2S_CK_Pin */
  GPIO_InitStruct.Pin = I2S_WS_Pin|I2S_CK_Pin;
  GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
  GPIO_InitStruct.Pull = GPIO_NOPULL;
  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
  GPIO_InitStruct.Alternate = GPIO_AF8_SPI6;
  HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);

  /*Configure GPIO pins : LCD_RGB_G7_Pin LCD_RGB_G4_Pin */
  GPIO_InitStruct.Pin = LCD_RGB_G7_Pin|LCD_RGB_G4_Pin;
  GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
  GPIO_InitStruct.Pull = GPIO_NOPULL;
  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
  GPIO_InitStruct.Alternate = GPIO_AF10_LTDC;
  HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);

  /*Configure GPIO pin : I2S_MCK_Pin */
  GPIO_InitStruct.Pin = I2S_MCK_Pin;
  GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
  GPIO_InitStruct.Pull = GPIO_NOPULL;
  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
  GPIO_InitStruct.Alternate = GPIO_AF5_SPI6;
  HAL_GPIO_Init(I2S_MCK_GPIO_Port, &GPIO_InitStruct);

  /*Configure GPIO pin : LCD_RGB_B7_Pin */
  GPIO_InitStruct.Pin = LCD_RGB_B7_Pin;
  GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
  GPIO_InitStruct.Pull = GPIO_NOPULL;
  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
  GPIO_InitStruct.Alternate = GPIO_AF12_LTDC;
  HAL_GPIO_Init(LCD_RGB_B7_GPIO_Port, &GPIO_InitStruct);

  /*Configure GPIO pins : RMII_TXD0_Pin RMII_RX_ER_Pin RMII_TXD1_Pin */
  GPIO_InitStruct.Pin = RMII_TXD0_Pin|RMII_RX_ER_Pin|RMII_TXD1_Pin;
  GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
  GPIO_InitStruct.Pull = GPIO_NOPULL;
  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
  GPIO_InitStruct.Alternate = GPIO_AF11_ETH;
  HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);

  /*Configure GPIO pins : UCPD1_VSENSE_Pin UCPD1_ISENSE_Pin */
  GPIO_InitStruct.Pin = UCPD1_VSENSE_Pin|UCPD1_ISENSE_Pin;
  GPIO_InitStruct.Mode = GPIO_MODE_ANALOG;
  GPIO_InitStruct.Pull = GPIO_NOPULL;
  HAL_GPIO_Init(GPIOF, &GPIO_InitStruct);

/* 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.
  * @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,
     ex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */
  /* USER CODE END 6 */
}
#endif /* USE_FULL_ASSERT */

Andrew Neil · ‎2024-11-25

So what investigation/testing/debugging have you done to find out what's going on?

Is your STM32H7S78 actually transmitting anything at all? If so, is it transmitting correctly?
Does your STM32H7S78 receive correctly?
Have you tested the parts separately - eg, with a terminal - before wiring them together?

Some tips here on debugging serial comms:

https://community.st.com/t5/community-guidelines/how-to-write-your-question-to-maximize-your-chances-to-find-a/tac-p/706966/highlight/true#M49

harshpanchal_6 · ‎2025-01-17

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 · ‎2025-01-17

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.

My STM32 stuff on github - compact USB device stack and more: https://github.com/gbm-ii/gbmUSBdevice

Karl Yamashita · ‎2025-01-17

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.

Don't worry, I won't byte.
TimerCallback tutorial! | UART and DMA Idle tutorial!

If you find my solution useful, please click the Accept as Solution so others see the solution.