I have been trying for some time to put my stm32f4 disc board in sleep mode with freertos and wake it up via an interrupt on my PB9without success. I would like my stm to go to sleep and wake up only if I have an interrupt on my pin (sleep time can be long).

After research on the internet I guess I have to use the mode tickless in FreeRTOS. Here is my FreeRTOSConfig.h

#define configUSE_TICKLESS_IDLE                  1
#define configEXPECTED_IDLE_TIME_BEFORE_SLEEP    100
#define configTICK_RATE_HZ                       ((TickType_t)1000)

My EXTI9_5_IRQHandler work fine I’ve tested it.

void EXTI9_5_IRQHandler(void) {
  BaseType_t xHigherPriorityTaskWoken = pdFALSE;
  uint32_t current_time = HAL_GetTick();

   if (__HAL_GPIO_EXTI_GET_IT(STAT_ALIM_GPIO_PIN) != RESET) {
    __HAL_GPIO_EXTI_CLEAR_IT(STAT_ALIM_GPIO_PIN);
    if (current_time - last_interrupt_time > 50) {
      last_interrupt_time = current_time;

      if (HAL_GPIO_ReadPin(GPIOB, STAT_ALIM_GPIO_PIN) == GPIO_PIN_RESET) {
        vTaskNotifyGiveFromISR(T_handleStatAlimInterrupt, &xHigherPriorityTaskWoken);
        portYIELD_FROM_ISR(xHigherPriorityTaskWoken);
      }
    }

  }
}

My Task

void User_handleStatAlimInterrupt(__unused void const *argument) {
  while (1) {
    ulTaskNotifyTake(pdTRUE, portMAX_DELAY);
    if(HAL_GPIO_ReadPin (STAT_ALIM_GPIO_PORT, STAT_ALIM_GPIO_PIN)) {

      vTaskSuspend(task1);
      vTaskSuspend(task2);


      __HAL_RCC_PWR_CLK_ENABLE();
      HAL_PWR_EnterSLEEPMode(PWR_MAINREGULATOR_ON, PWR_SLEEPENTRY_WFI);


      vTaskResume(task1);
      vTaskResume(task2);


    }else{
      USER_LOG_INFO("stat alim 0");
    }
  }
}

And for finish vPortSuppressTicksAndSleep redefinition

void vPortSuppressTicksAndSleep(TickType_t xExpectedIdleTime) {
  __disable_irq();
  __DSB();
  __ISB();

  if (eTaskConfirmSleepModeStatus() == eAbortSleep) {
    __enable_irq();
  } else {

    SysTick->CTRL &= ~SysTick_CTRL_ENABLE_Msk;


    HAL_PWR_EnterSLEEPMode(PWR_MAINREGULATOR_ON, PWR_SLEEPENTRY_WFI);


    SysTick->CTRL |= SysTick_CTRL_ENABLE_Msk;

    __enable_irq();
  }
}

my problem my stm never stays in sleep mode…