Interrupt Time Base Generation in interrupt mode fails

[DOrtf]

Hi all,

im trying to bring a timer interrupt to work. In the first step I want to create an LED blinky.

For that I followed the instructions from the Knowledge base example (How to generate a one second interrupt using an STM32 Timer). The only difference is that I use TIM17 instead of TIM3 (I also tried to use TIM3 at first, but with the same problem).

I also checked and debugged the generated Code to initialize the Timer. All functions mentioned in the description from stm32g4xx_hal_tim.c are implemented and called, when MX_TIM17_Init is called from main. The call hierarchy is MX_TIM17_Init --> HAL_TIM_Base_Init(&htim17) --> HAL_TIM_Base_MspInit(htim). The HAL_TIM_Base_MspInit() function resides in stm32g4xx_hal_msp.c and calls the functions to enable the peripheral:

void HAL_TIM_Base_MspInit(TIM_HandleTypeDef* htim_base)
{
  if(htim_base->Instance==TIM17)
  {
  /* USER CODE BEGIN TIM17_MspInit 0 */
 
  /* USER CODE END TIM17_MspInit 0 */
    /* Peripheral clock enable */
    __HAL_RCC_TIM17_CLK_ENABLE();
    /* TIM17 interrupt Init */
    HAL_NVIC_SetPriority(TIM1_TRG_COM_TIM17_IRQn, 0, 0);
    HAL_NVIC_EnableIRQ(TIM1_TRG_COM_TIM17_IRQn);
  /* USER CODE BEGIN TIM17_MspInit 1 */
 
  /* USER CODE END TIM17_MspInit 1 */
  }
 
}

After that HAL_TIM_Base_Start_IT(&htim17) is called:

MX_TIM17_Init();
 
  HAL_TIM_Base_Start_IT(&htim17);

When I step over this call with the Debugger the program is lost at address 0x1fff5064:

Interesting fact is that I can step through the HAL_TIM_Base_Start_IT function and can return with HAL_OK, but then it gets lost after that in the following while loop at the same address.

I also added an interrupt callback, but it is obviously never called. Also the TIM17_IRQHandler in stm32g4xx_it.c is never called.

void HAL_TIM_PeriodElapsedCallback(TIM_HandleTypeDef *htim) {
  //Check which timer triggered this callback
  if (htim == &htim17) {  //The interrupt comes from the timer with one second period
    HAL_GPIO_TogglePin(GPIOD, CPU_LED1_BLUE_O_Pin);  //Toggle the CPU LED BLUE
  }
}

Am I using the Timer correctly? Is there anything missing for a correct initialization?

Is there a maybe a mistake in the MX configuration?

STM32CubeIDE Version: 1.11.2 Build: 14494_20230119_0724 (UTC) is used.

STM32G473VEH6 is the used device.

Debugger: ST-LINK/V2

Any Help or Hints is appreciated! Many thanks in advance!

Daniel

[waclawek.jan · Accepted solution]

> when I step over this call with the Debugger the program is lost at address 0x1fff5064:

That's the system memory i.e. the built-in bootloader. It appears that there may be several scenarios how this happens.

Try power-cycle the board. If this does not help, check option bytes and if set, try clearing BFB2.

https://community.st.com/s/question/0D53W000029TVRmSAO/for-stm32g4xx-please-clarify-role-of-bfb2-in-option-bytes

If you need to have BFB2 set, set VTOR to 0x0800'00000, or change the 0x0000'0000 mapping to FLASH.

JW

[DOrtf]

Thanks a lot for your reply and for the mentioned post!

I will geht through this and keep you informed about the success! 😊

[DOrtf]

Hello Jan,

i went through the mentioned post and implemented your advice.

When I set the VTOR Register to 0x0800 0000 as you mentioned, the timer interrupt works!

Many thanks for your advice!

Daniel

[DOrtf]

There is also an other way, how this problem can be solved.

To relocate the vector table the line /* #define USER_VECT_TAB_ADDRESS */ in system_stm32g4xx.c can be uncommented.