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STayl.3
STayl.3
Associate II
February 9, 2021
Question

DEBUGGER STUCK IN FREERTOS TASK

  • February 9, 2021
  • 3 replies
  • 1546 views

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 */
}

This topic has been closed for replies.

3 replies

KnarfB
KnarfB
Super User
February 10, 2021

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
STayl.3Author
Associate II
February 10, 2021

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
STayl.3Author
Associate II
February 19, 2021

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

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