STM32L452 wakeup issue

[JKol]

Hello,

My STM32L452 Nucleo-64 board does not wake up from sleep mode by an external interrupt.

Interrupts are working, but after calling this function:

HAL_PWR_EnterSLEEPMode(PWR_LOWPOWERREGULATOR_ON, PWR_SLEEPENTRY_WFI);

Program wait on this function (checked by debugger):

 __WFI();

And no extern interrupts - I try IEXT10_15 and IEXT0 doesn't wake it up.

After restoring the debugger, the program continues normally.

Some settings:

  GPIO_InitStruct.Pin = BUTTON1_Pin;
  GPIO_InitStruct.Mode = GPIO_MODE_IT_FALLING;
  GPIO_InitStruct.Pull = GPIO_NOPULL;
  HAL_GPIO_Init(GPIOC, &GPIO_InitStruct);

  __HAL_RCC_GPIOC_CLK_ENABLE();

  __HAL_RCC_SYSCFG_CLK_ENABLE();
  HAL_NVIC_SetPriority(EXTI15_10_IRQn, 15, 15); // Set priority
  HAL_NVIC_EnableIRQ(EXTI15_10_IRQn);           // Enable the interrupt

The interrupts are normally handled and working. But after going to sleep mode, nothing happens after pressing the button or after another interrupt arrives (2 USARTs and 3 GP inputs).

What could be wrong?

Thanks a lot,
Jan.

[Sarra.S]

Hello Jan, 

The configuration you provided seems correct, but double-check the EXTI line configuration

You can refer to this wiki article using EXTI to wakeup from different stop modes: Getting started with PWR - stm32mcu