STM32WB standby mode WKUPx

[jirdom]

I'm working with the p-nucleo-wb55, and I would like to configure the pin PA0 , PC13 to wake up the MCU from Standby Mode. I configued PA0 and PC13 from STM32CubeMX to GPIO_EXTI0 and GPIO_EXTI13 respectively.

Config:

PA0 : External Interrupt with Falling edge , Pull-up

PC13 : External Interrupt with Falling edge , Pull-up

In my code I set the sequence that I follow to enable the WKUP line is:

HAL_PWR_EnableWakeUpPin(PWR_WAKEUP_PIN1_LOW);

HAL_PWR_EnableWakeUpPin(PWR_WAKEUP_PIN2_LOW);

HAL_PWR_EnterSTANDBYMode();

But interrupt from PA0 , PC13 not working in standby mode.

I reference from

RM0434: Multiprotocol wireless 32-bit MCU Arm®-based Cortex®-M4 with FPU, Bluetooth® Low-Energy and 802.15.4 radio solution

[Le Corre Pierre]

Hello @jirdom​ ,

This does not exactly points to your solution but you can have a look inside the STM32Cube_FW_WB_V1.2.0 under Projects\P-NUCLEO-WB55.Nucleo\Examples\PWR.

You will find 5 examples detailing how to go to the various low power mode and use the various wake up sources:

• PWR_LPRUN: How to enter and exit the Low-power run mode
• PWR_LPSLEEP: How to enter the Low-power sleep mode and wake up from this mode by using an interrupt
• PWR_PVD: How to configure the programmable voltage detector by using an external interrupt line. External DC supply must be used to supply Vdd
• PWR_STANDBY_RTC: How to enter the Standby mode and wake-up from this mode by using an external reset or the RTC wakeup timer
• PWR_STOP2_RTC: How to enter the Stop 2 mode and wake-up from this mode using an external reset or RTC wakeup timer

Pierre.

[jirdom]

Hi Le Corre Pierre(ST Employee)

Thank for your information.

Do have example wake up from standby mode with WKUPx?

I checked from stm32wb55rg datasheet (LINK) on page 35. Standby mode able to wakeup by RF, Reset pin 5 I/Os (WKUPx) BOR, RTC, IWDG.

And the I/Os with wakeup from Standby/Shutdown capability are: PA0, PC13, PC12, PA2, PC5

[HSpre.1]

Hi JIrdom

Did you ever find solution to your problem? I can use the example PWR_STANDBY_RTC and wake up from rtc and wake up from wakeup pin with bare code.

But as soon as i add BLE funtionality wakeup pin does not work anymore. , but RTC wakeup works fine

[eloibonte]

Hello @jirdom​ and @HSpre.1​ ,

I am working on a project with the STM32WB55xx MCU.

I was wondering, even a long time after, if you had found a solution to your problem. I encounter exactly the same situation and I don't know what to do. On the datasheet, ST says :

"Standby Mode - Wakeup capability : Radio system (Bluetooth Low Energy, 802.15.4) ".

But then I couldn't wake up the MCU with RF or even with the WKUPx pins.

If you have any idea I would really appreciate your help :)

Thank you very much,

Best regards,

Eloi B.

[PierreL]

Hello @eloibonte @HSpre.1  @jirdom 

I am working on a project with the STM32WB55

Even a long time after, I wondered if you had found a solution to your problem. I encounter the same situation and I don't know what to do.

I have a timer that after 5 sec launch the offmode :

	HAL_GPIO_TogglePin(LD3_GPIO_Port, LD3_Pin);
	count++;
	
		if (count > 5)
		{
			count = 0;
			//HAL_PWR_DisableWakeUpPin(PWR_WAKEUP_PIN1);
			//HAL_PWR_DisableWakeUpPin(PWR_WAKEUP_PIN2);
			//HAL_PWR_DisableWakeUpPin(PWR_WAKEUP_PIN3);
			//HAL_PWR_DisableWakeUpPin(PWR_WAKEUP_PIN4);
			HAL_PWR_DisableWakeUpPin(PWR_WAKEUP_PIN5);

			 /* Clear all related wakeup flags*/
			 __HAL_PWR_CLEAR_FLAG(PWR_FLAG_WU);

			 /* Enable WakeUp Pin PWR_WAKEUP_PIN2 connected to PC.13 */
			 //HAL_PWR_EnableWakeUpPin(PWR_WAKEUP_PIN1);
			 // HAL_PWR_EnableWakeUpPin(PWR_WAKEUP_PIN2);
			 //HAL_PWR_EnableWakeUpPin(PWR_WAKEUP_PIN3);
			 // HAL_PWR_EnableWakeUpPin(PWR_WAKEUP_PIN4);
			 HAL_PWR_EnableWakeUpPin(PWR_WAKEUP_PIN5);

			 PWR_EnterOffMode();
}

 With this example, I do enter in Off mode (the Led stop to blink). But none (even if uncomment ) of the wake up pin work. (The led do not goes to blink)

But there are correctly set as you can see:

 

[Remyhx]

Wonder if somebody found the solution.

I use the stm32wb with rf and uart (at least during debug stage) and have an external pull down on SYS_WKUP_4. A button will feed it with 3.3V/Vcc if it has to wakeup.

First problem is that I have to use HAL_SuspendTick(); to prevent the uart and most probably also the rf to interfere (otherwise it will not sleep and continue). next I use:

 

__HAL_PWR_CLEAR_FLAG(PWR_FLAG_WU);
HAL_PWR_EnableWakeUpPin(PWR_WAKEUP_PIN4);

 

to set the wakeup pin. 

 

It will go into standby mode, but waking up is not enabled. I also enabled sys_wkup_4 by selecting it in cubemx (pin editor). No extra code is created.

 

In AN5289 : "When the user application must enter Standby mode, it must first stop all RF activities, and fully reinitialize CPU2 when coming out of Standby mode." 

I don't need the reinitialization, but how do I correctly stop RF?