Managing Interrupts in M4

[AGamb.4]

Hello,

I am trying to manage some interrupts in the M4, specifically the Tamper Interrupt.

Using the STM32CubeIDE (CubeMX) I am unable to select the Tamper interrupt that shows in the NVIC peripheral, when I select it, it gets deselected automatically. What could be the cause of this behaviour?

I am allocating the tamper peripheral to the non-secure world (A7) in SP-Min (Manually changed in source code) and enabling the external tampers. In M4 I try to enable the interrupt and set an IRQHandler with the following code:

void tamp_init (void)
{
  HAL_NVIC_SetPriority (TAMP_IRQn, 1, 0);
  HAL_NVIC_EnableIRQ (TAMP_IRQn);
}
 
void TAMP_IRQHandler (void)
{
  // Do something (turn led on)
}

I have a button connected to the tamper input signal, when I press this button I expect to see the led light up but it does not. I know the tamper is triggered because the backup registers are cleared.

What is missing in my configuration or how should I set up the interrupts? Should I configure something in the A7 GIC or EXTI?

Best regards,

Andrés

[Jean-Marc S]

Hello,

not sure at this point regarding the CubeMx behaviour.

However in your code have you the below items ?

in the main.c

1)

configuration of the Tamper (example from other product but should be very similar)

stamperstructure.Tamper                      = RTC_TAMPER_2;

 stamperstructure.Trigger                     = RTC_TAMPERTRIGGER_FALLINGEDGE;

 stamperstructure.Filter                      = RTC_TAMPERFILTER_DISABLE;

 stamperstructure.SamplingFrequency           = RTC_TAMPERSAMPLINGFREQ_RTCCLK_DIV32768;

 stamperstructure.PrechargeDuration           = RTC_TAMPERPRECHARGEDURATION_1RTCCLK;

 stamperstructure.TamperPullUp                = RTC_TAMPER_PULLUP_ENABLE;

 stamperstructure.TimeStampOnTamperDetection  = RTC_TIMESTAMPONTAMPERDETECTION_DISABLE;

if (HAL_RTCEx_SetTamper_IT(&RtcHandle, &stamperstructure) != HAL_OK)

   {

    /* Initialization Error */

    Error_Handler();

   }

2) define call back function

void HAL_RTCEx_Tamper2EventCallback(RTC_HandleTypeDef *hrtc)

{

 TamperStatus = SET;

}

/*##- Wait for the tamper button is pressed ##############################*/

 while (TamperStatus != SET)

 {

   /* Delay */

   HAL_Delay(1000);

 }

   /* Do something */

   ….

in the stm32mp15xx_it.c

1) define the IRQHandler

void TAMP_IRQHandler(void)

{

 HAL_RTCEx_TamperIRQHandler(&RtcHandle);

}

JM