DEBUGGER STUCK IN FREERTOS TASK

[STayl.3]

Good day community,

I'm experiencing difficulty with debugging my project. I'm using FreeRTOS with a STM32L433 Nucleo.

The software is stuck in the task with the breakpoint and it won't hit the next breakpoint I have in my Timer1 interrupt.

STM32CubeIDE v1.5.1

MAC OS Catalina 10.15.5

void usartIT_H(void const * argument)
{
  /* USER CODE BEGIN usartIT_H */
  /* Infinite loop */
  for(;;)
  {
	  if (SerialFlag) //If value == 1
	  {
		  if((Rx_Data[0] == 0x3C) && (Rx_Data[5] == 0x3E))
		  {
			  liveButton.pageNr = Rx_Data[1];
			  liveButton.btnID = Rx_Data[2];
			  liveButton.btnVal = Rx_Data[3];
			  liveButton.btnPress = Rx_Data[4];
		  }
 
		  if((Rx_Data[0] == 0x66) && (Rx_Data[2] == 0xFF) && (Rx_Data[3] == 0xFF))
		  {
			  switch (Rx_Data[0])
			  {
			  case 0x66:
				  PageNrFromNex = Rx_Data[1];
				  break;
 
			  default: break;
			  }
		  }
		  // TODO: Clear Rx_Data MEMSET 0
		  dataPtr = 0;
		  SerialFlag = 0;
	  }
 
    osDelay(10);
  }
  /* USER CODE END usartIT_H */
}

[KnarfB]

Remove or disable all breakpoints but the Timer1 one? Doublecheck the Breakpoints View in STM32CubeIDE for active breakpoints. Can you prove that the timer is running at all?

[STayl.3]

Hello and thanks for the reply. I can indeed confirm that my timer is working - I changed my parameters to flash the onboard LED every 100ms.

I've conducted a Google search on the issue and the various results seem to point to the timer - I'm using TIM6 for my SysTick.

The same result occurs when I only have one breakpoint in my USART IRQ Handler - it just continuously stays in the IRQ Handler.

I'm using the LL drivers for the USART if that makes any difference.

void USART1_IRQHandler(void)
{
  /* USER CODE BEGIN USART1_IRQn 0 */
	if ((READ_BIT(USART1->ISR, USART_ISR_RXNE) == USART_ISR_RXNE))
	//if ((USART1->ISR & USART_ISR_RXNE) == USART_ISR_RXNE)
	{
		USART2_Timeout = 21; //Need to change variable name to USART1_Timeout
		Rx_Data[dataPtr++] = USART1->RDR;
	}
  /* USER CODE END USART1_IRQn 0 */
  /* USER CODE BEGIN USART1_IRQn 1 */
 
  /* USER CODE END USART1_IRQn 1 */
}

Here is the code snippet for my TIM6 Interrupt Handler: (I'm using the standard HAL Libraries for it)

void HAL_TIM_PeriodElapsedCallback(TIM_HandleTypeDef *htim)
{
  /* USER CODE BEGIN Callback 0 */
	if (htim->Instance == TIM16)
	{
		//HAL_GPIO_TogglePin(GPIOB, LD4_Pin);
 
		if (USART2_Timeout) //If value > 0
		{
			USART2_Timeout--;
 
			if(USART2_Timeout == 0)
			{
				SerialFlag = 1;
			}
		}
	}
  /* USER CODE END Callback 0 */
  if (htim->Instance == TIM6) {
    HAL_IncTick();
  }
  /* USER CODE BEGIN Callback 1 */
 
  /* USER CODE END Callback 1 */
}

I've tried the various solutions to no avail on my side:

• Change the priority of the timer
• "/* IMPORTANT: This define MUST be commented when used with STM32Cube firmware, to prevent overwriting SysTickHandler defined within STM32Cube HAL */ /* #define xPortSysTickHandler SysTickHandler*/" - I've commented and un-commented it
• "I decommented it , i also had to comment the definition of the systick interruption in stm32f4xx__it.c to avoid duplicate definition" - can't find this definition

I'm a complete novice to the ARM world - I've completed some courses on Udemy and YouTube tutorials.

I just don't have enough knowledge as yet on how to properly debug my project and the inner workings of FreeRTOS.

I'm almost 100% sure it has something to do with FreeRTOS and the interrupt for it.

Any advice is highly appreciated.

Thanks.

[STayl.3]

I believe this issue is related to my other problem relating to the debugger plugged into USB-C with MAC OS:

https://community.st.com/s/question/0D53W00000aIMIxSAO/debugging-issue-with-usbc?t=1613740695804