STM32H747XI Disc0 - UART with Interrupt - Data transfer between Cores

[donemuhendislik]

Hi all,

I'm new on STM32H747XI-Disc0. I ve started learn step-by-step everything from basics. So, I'm sorry for my basic questions...

According to my tutorial timeline, today I ve started to learn UART communication. I tried to type a small example :

- I assigned PI12 GPIO output to CM7 (LED_M7, I gave an alias) and PI14 GPIO output to CM4 (LED_M4, I gave an alias).

- These LEDs blink on according to their small duties.

This example :

on CM7 :

char data_transmit[100];

void HAL_UART_TxCpltCallback(UART_HandleTypeDef *huart)
{
   //The following line is canceled, because of fast interaction.
   //But I tested this callback function, and works good and expected.
   //HAL_UART_Transmit_IT(&huart1, (uint8_t *)data_transmit, sizeof(data_transmit));
}

...

int main(void)
{
//I used this for transfering my command to related char array
strcpy(data_transmit,"LIGHT_LED_M4\r\n");

/* Infinite loop */
  /* USER CODE BEGIN WHILE */
  while (1)
  {
    /* USER CODE END WHILE */
	  HAL_UART_Transmit_IT(&huart1, (uint8_t *)data_transmit, sizeof(data_transmit));
	  HAL_GPIO_TogglePin(GPIOI, LED_M7_Pin);
	  HAL_Delay(1000);
    /* USER CODE BEGIN 3 */
  }
  /* USER CODE END 3 */
}

According to CM7 core, LED_M7 (PI12 connected) is blinking individual from UART Transmit (Interrupt method). UART Transmit IT function (also callback function works good too) works successfully. I can check sent data by Hercules.

on CM4 core :

uint8_t target_command[100] = "LIGHT_LED_M4";
uint8_t rx_data[100];

void HAL_UART_RxCpltCallback(UART_HandleTypeDef *huart)
{
	HAL_UART_Receive_IT(&huart1, rx_data, sizeof(rx_data));
}

...

int main(void)
{
...
/* USER CODE BEGIN 2 */
  HAL_UART_Receive_IT(&huart1, rx_data, sizeof(rx_data));
/* USER CODE END 2 */


/* Infinite loop */
  /* USER CODE BEGIN WHILE */
  while (1)
  {
    /* USER CODE END WHILE */
	  if(strcmp((char *)rx_data,(char *)target_command) == 0)
	  {
		  HAL_GPIO_TogglePin(GPIOI, LED_M4_Pin);
		  HAL_Delay(250);
	  }
	  //HAL_GPIO_TogglePin(GPIOI, LED_M4_Pin);
	  //HAL_Delay(250);
    /* USER CODE BEGIN 3 */
  }
  /* USER CODE END 3 */

}

According to my experiment, I tried to send a command from CM7 core side as "LIGHT_LED_M4" with UART1 -> HAL_UART_Transmit_IT(&huart1, target_command, sizeof(target_command) - and these command should be read by CM4 core and check this "LIGHT_LED_M4" command if it is, toggle LED_M4. But CM4 side not working and no reaction for this command.

Is this possible ? If it is possible, how can I do it ? What I do wrong on CM4 side ?

By the way, for inter communication on STM32 dual core (OpenAMP / RpMSG or OpenAMP/FreeRTOS) I will start to learn...

This is just for learning experiment. For the next tests, I will try to communicate with Nextion LCD screen.

Thanks a lot for your help, and sorry for my basic questions.

[STea]

Hello @donemuhendislik ,

i suggest you check the interrupt priority setting as well as the UART configuration is the same form both sides try to go throw this by an elimination process to further help you cement your knowledge(pinout config ,UART config ,priority setting ...) . Best of luck in you learning journey .

BR

[donemuhendislik]

Thank you so much 👍🏻