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STOP2 Mode

Chintu
Associate

‎2025-04-04 12:14 AM - last edited on ‎2025-04-04 12:53 AM by

HLO

I am using STOP2 Mode in my controller is stm32l496 series it entering the stop2 mode but it's not coming out for waking up i use external interrupt .

interrupt is generating before entering stop2 mode but it not generated after the stop2 mode.

what is the problem.

 

HAL_SuspendTick();

// Optional: clear EXTI pending bit
__HAL_GPIO_EXTI_CLEAR_IT(GPIO_PIN_0); // Replace with your EXTI pin

// Go to STOP2
HAL_PWREx_EnterSTOP2Mode(PWR_STOPENTRY_WFI);

// Restore clocks
SystemClock_Config();

// Re-initialize GPIOs including EXTI pin
SystemReInit(); // or reconfigure the EXTI pin here manually

HAL_GPIO_WritePin(LED_RED_GPIO_Port, LED_RED_Pin, SET); // Debug
HAL_ResumeTick();

 

void EXTI0_IRQHandler(void)
{
  /* USER CODE BEGIN EXTI0_IRQn 0 */

  /* USER CODE END EXTI0_IRQn 0 */
  HAL_GPIO_EXTI_IRQHandler(GPIO_PIN_0);
  /* USER CODE BEGIN EXTI0_IRQn 1 */

  /* USER CODE END EXTI0_IRQn 1 */
}

Code formatting applied - please see How to insert source code for future reference.

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Andrew Neil
Guru

‎2025-04-04 1:03 AM

Welcome to the forum.

For best results (including how to properly post source code), please see: How to write your question to maximize your chances to find a solution.

 

@Chintu wrote:

interrupt is generating before entering stop2 mode but it not generated after the stop2 mode.

what is the problem.

Have you enabled the pin in STOP2 ?

 

AndrewNeil_0-1743753653370.png

https://www.st.com/resource/en/datasheet/stm32l496ag.pdf#page=34

via: https://www.st.com/en/microcontrollers-microprocessors/stm32l496ag.html#documentation

 

A complex system that works is invariably found to have evolved from a simple system that worked.
A complex system designed from scratch never works and cannot be patched up to make it work.
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Chintu
Associate
In response to Andrew Neil

‎2025-04-04 1:43 AM

Have you enabled the pin in STOP2 ?

yes i did.

/*Configure GPIO pin : PE0 */
GPIO_InitStruct.Pin = GPIO_PIN_0;
GPIO_InitStruct.Mode = GPIO_MODE_IT_RISING;
GPIO_InitStruct.Pull = GPIO_NOPULL;
HAL_GPIO_Init(GPIOE, &GPIO_InitStruct);

Screenshot 2025-04-04 141104.pngScreenshot 2025-04-04 141131.png

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Andrew Neil
Guru
In response to Chintu

‎2025-04-04 2:02 AM

please see How to insert source code  

A complex system that works is invariably found to have evolved from a simple system that worked.
A complex system designed from scratch never works and cannot be patched up to make it work.
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Chintu
Associate

‎2025-04-04 2:09 AM - last edited on ‎2025-04-04 2:22 AM by

Merged from separate thread.

void PowerDownUp(uint8_t Powermode)
{
//	HAL_SuspendTick();
//
//	PowerDown_GPIO_Deinit();
////		GPIO_InitTypeDef GPIO_InitStruct = {0};
////
//		__HAL_PWR_CLEAR_FLAG(PWR_FLAG_WUF2);
////
////
////
////		HAL_PWR_EnableWakeUpPin(PWR_WAKEUP_PIN2_HIGH);
////
//		HAL_PWREx_EnterSTOP2Mode(PWR_STOPENTRY_WFI);
//
//
//
////================ Init Modules===================================================//
//
////	SystemReInit();
//		SystemClock_Config();
//
//		HAL_GPIO_WritePin(LED_RED_GPIO_Port, LED_RED_Pin, SET);
//		HAL_ResumeTick();

	__HAL_RCC_SYSCFG_CLK_ENABLE();

    HAL_SuspendTick();

    // Optional: clear EXTI pending bit
    __HAL_GPIO_EXTI_CLEAR_IT(GPIO_PIN_0);  // Replace with your EXTI pin
    EXTI->IMR1 |= EXTI_IMR1_IM0;
    // Go to STOP2
    HAL_PWREx_EnterSTOP2Mode(PWR_STOPENTRY_WFI);

    // Restore clocks
    SystemClock_Config();

    // Re-initialize GPIOs including EXTI pin
    SystemReInit();  // or reconfigure the EXTI pin here manually

    HAL_GPIO_WritePin(LED_RED_GPIO_Port, LED_RED_Pin, SET);  // Debug
    HAL_ResumeTick();
}
View more

 

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Chintu
Associate
In response to Andrew Neil

‎2025-04-04 2:13 AM

I can t give you full source code did i miss any things.

 

void PowerDownUp(uint8_t Powermode)
{
//	HAL_SuspendTick();
//
//	PowerDown_GPIO_Deinit();
////		GPIO_InitTypeDef GPIO_InitStruct = {0};
////
//		__HAL_PWR_CLEAR_FLAG(PWR_FLAG_WUF2);
////
////
////
////		HAL_PWR_EnableWakeUpPin(PWR_WAKEUP_PIN2_HIGH);
////
//		HAL_PWREx_EnterSTOP2Mode(PWR_STOPENTRY_WFI);
//
//
//
////================ Init Modules===================================================//
//
////	SystemReInit();
//		SystemClock_Config();
//
//		HAL_GPIO_WritePin(LED_RED_GPIO_Port, LED_RED_Pin, SET);
//		HAL_ResumeTick();

	__HAL_RCC_SYSCFG_CLK_ENABLE();

    HAL_SuspendTick();

    // Optional: clear EXTI pending bit
    __HAL_GPIO_EXTI_CLEAR_IT(GPIO_PIN_0);  // Replace with your EXTI pin
    EXTI->IMR1 |= EXTI_IMR1_IM0;
    // Go to STOP2
    HAL_PWREx_EnterSTOP2Mode(PWR_STOPENTRY_WFI);

    // Restore clocks
    SystemClock_Config();

    // Re-initialize GPIOs including EXTI pin
    SystemReInit();  // or reconfigure the EXTI pin here manually

    HAL_GPIO_WritePin(LED_RED_GPIO_Port, LED_RED_Pin, SET);  // Debug
    HAL_ResumeTick();
}
View more

 

 

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Chintu
Associate
In response to Chintu

‎2025-04-04 2:15 AM

if you have any sample code wake-up from stop2mode please provide.

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mƎALLEm
ST Employee
In response to Chintu

‎2025-04-04 2:17 AM - edited ‎2025-04-04 2:18 AM

Hello @Chintu and welcome to the community,

You posted your thread in the wrong forum (I've moved it to STM32 MCU products forum board).

Could you please provide details on your issue?

See how to post a thread in the community: How to write your question to maximize your chances to find a solution

 

To give better visibility on the answered topics, please click on "Accept as Solution" on the reply which solved your issue or answered your question.
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Andrew Neil
Guru
In response to Chintu

‎2025-04-04 2:20 AM - edited ‎2025-04-04 2:23 AM

@Chintu wrote:

if you have any sample code wake-up from stop2mode please provide.

Have you looked at the samples available via CubeIDE?

ie, the examples in the STM32CubeL4 pack ?

 

Try a search for "power" on the Product Page 'Documentation' Tab:

AndrewNeil_0-1743758388335.png

https://www.st.com/en/microcontrollers-microprocessors/stm32l496ag.html#documentation 

A complex system that works is invariably found to have evolved from a simple system that worked.
A complex system designed from scratch never works and cannot be patched up to make it work.
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Chintu
Associate
In response to Andrew Neil

‎2025-04-04 2:47 AM

stm32l496zgt6

STM32CubeIDE

development board

Not coming out from stop2mode though external interrupt GPIO PE0 interrupt generating before entering's stop2mode but not in stop2mode what is the process to follow the wake up the controller stop2mode to normal mode.

void PowerDownUp(uint8_t Powermode)
{
//	HAL_SuspendTick();
//
//	PowerDown_GPIO_Deinit();
////		GPIO_InitTypeDef GPIO_InitStruct = {0};
////
//		__HAL_PWR_CLEAR_FLAG(PWR_FLAG_WUF2);
////
////
////
////		HAL_PWR_EnableWakeUpPin(PWR_WAKEUP_PIN2_HIGH);
////
//		HAL_PWREx_EnterSTOP2Mode(PWR_STOPENTRY_WFI);
//
//
//
////================ Init Modules===================================================//
//
////	SystemReInit();
//		SystemClock_Config();
//
//		HAL_GPIO_WritePin(LED_RED_GPIO_Port, LED_RED_Pin, SET);
//		HAL_ResumeTick();

	__HAL_RCC_SYSCFG_CLK_ENABLE();

    HAL_SuspendTick();

    // Optional: clear EXTI pending bit
    __HAL_GPIO_EXTI_CLEAR_IT(GPIO_PIN_0);  // Replace with your EXTI pin
    EXTI->IMR1 |= EXTI_IMR1_IM0;
    // Go to STOP2
    HAL_PWREx_EnterSTOP2Mode(PWR_STOPENTRY_WFI);

    // Restore clocks
    SystemClock_Config();

    // Re-initialize GPIOs including EXTI pin
    SystemReInit();  // or reconfigure the EXTI pin here manually

    HAL_GPIO_WritePin(LED_RED_GPIO_Port, LED_RED_Pin, SET);  // Debug
    HAL_ResumeTick();
}
View more
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