Failed to toggle a LED with STM32F429I-Disco1

[DJ_YANG]

Hello,

My board is STM32F429I-Disco1, the LED pin is PG13 and PG14, and the pins are set to 1. (So, after I click the run button，the LEDs light up).

After I write the code "HAL_GPIO_TogglePin(GPIOG, GPIO_PIN_13);" and "HAL_Delay(500);" in the "while (1)" of main.c, I click the run button and the console shows "Download verified successfully". But the LED does not blink.
When I click run button，startup_stm32f429zitx.s appears next to main.c . The 61st line ("ldr sp, =_estack /* set stack pointer */") of startup_stm32f429zitx.s  is marked.

May I ask how to handle this problem? Thank you very much.

[SofLit]

Hello,

Your issue is not clear. Could you please attach your project so we can have a look/test it?

[DJ_YANG]

Hello SofLit,

Following is project. Actually, I just write "HAL_GPIO_TogglePin(GPIOG, GPIO_PIN_13);" and "HAL_Delay(500);". Thanks.

[SofLit · Accepted solution]

Hello,

But you didn't mention you're using FreeRTOS which was an important information!

Indeed what are you seeing is a normal behavior. This is what you did:

  osThreadDef(defaultTask, StartDefaultTask, osPriorityNormal, 0, 4096);
  defaultTaskHandle = osThreadCreate(osThread(defaultTask), NULL);

  /* USER CODE BEGIN RTOS_THREADS */
  /* add threads, ... */
  /* USER CODE END RTOS_THREADS */

  /* Start scheduler */
  osKernelStart();

  /* We should never get here as control is now taken by the scheduler */

  /* Infinite loop */
  /* USER CODE BEGIN WHILE */
  while (1)
  {
    /* USER CODE END WHILE */
	 HAL_GPIO_TogglePin(GPIOG, GPIO_PIN_13);
	 HAL_Delay(500);
    /* USER CODE BEGIN 3 */
  }

You're toggling the LED after the call of osKernelStart(). So the while loop is no more reacheable.

So either you remove the usage of the FreeRTOS in your code as following:

  /* Create the thread(s) */
  /* definition and creation of defaultTask */
//  osThreadDef(defaultTask, StartDefaultTask, osPriorityNormal, 0, 4096);
//  defaultTaskHandle = osThreadCreate(osThread(defaultTask), NULL);

  /* USER CODE BEGIN RTOS_THREADS */
  /* add threads, ... */
  /* USER CODE END RTOS_THREADS */

  /* Start scheduler */
//  osKernelStart();

  /* We should never get here as control is now taken by the scheduler */

  /* Infinite loop */
  /* USER CODE BEGIN WHILE */
  while (1)
  {
    /* USER CODE END WHILE */
	 HAL_GPIO_TogglePin(GPIOG, GPIO_PIN_13);
	 HAL_Delay(500);
    /* USER CODE BEGIN 3 */
  }

Or simply toggle the LED in one of the created tasks and remove it from the while loop in main(). In your case: StartDefaultTask():

.
.
. 
 /* definition and creation of defaultTask */
  osThreadDef(defaultTask, StartDefaultTask, osPriorityNormal, 0, 4096);
  defaultTaskHandle = osThreadCreate(osThread(defaultTask), NULL);

  /* USER CODE BEGIN RTOS_THREADS */
  /* add threads, ... */
  /* USER CODE END RTOS_THREADS */

  /* Start scheduler */
  osKernelStart();

  /* We should never get here as control is now taken by the scheduler */

  /* Infinite loop */
  /* USER CODE BEGIN WHILE */
  while (1)
  {
    /* USER CODE END WHILE */

    /* USER CODE BEGIN 3 */
  }
  /* USER CODE END 3 */
}


/* USER CODE END Header_StartDefaultTask */
void StartDefaultTask(void const * argument)
{
  /* init code for USB_HOST */
  MX_USB_HOST_Init();
  /* USER CODE BEGIN 5 */
  /* Infinite loop */
  for(;;)
  {
    HAL_GPIO_TogglePin(GPIOG, GPIO_PIN_13);
    osDelay(500);
  }
  /* USER CODE END 5 */
}

 Hope it does answer your question.

[DJ_YANG]

Hello SofLit,

Yes, your suggestion work. I am a newbie.

I just compile the generated code but do not know it includes FreeRTOS .

Thanks!