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JGuir.1
JGuir.1
Associate II
October 24, 2022
Question

STM32WB15 Wake_up pin polarity issue

  • October 24, 2022
  • 4 replies
  • 1892 views

Hello,

I use a stm32WB15 MCU in shutdown mode with a wake up by the wake up pin PA0 (System wake-up 1).

Everything works fine with the polarity "High". I use the HAL function "HAL_PWR_EnableWakeUpPin(PWR_WAKEUP_PIN1_HIGH)".

But with the polarity "Low" and the function "HAL_PWR_EnableWakeUpPin(PWR_WAKEUP_PIN1_LOW)" the MCU wakes up regardless of the logic level on the input pin (as if both Edges were selected !).

I checked the WP1 bit in PWR_CR4 and is setting is correct (0 for high level detection and 1 for low level).

I set the level on the input pin wiht a generator and I verify with a oscilloscope for debugging so it is not a hardware problem...

Thanks for your answer.

Best regards,

Joel

This topic has been closed for replies.

4 replies

Piranha
Piranha
Principal III
October 24, 2022

https://community.st.com/s/question/0D53W00001bnh8dSAA/how-to-enter-standby-or-shutdown-mode-on-stm32

The particular issue you described is most likely the issue 1 in my article.

JGuir.1
JGuir.1Author
Associate II
October 26, 2022

Thanks Piranha for your response.

But my question is not how to enter in shutdown mode but why with High level it works correctly and why with Low level it fail ( in this case the MCU wakes up regardless the level on the wake up pin).

I

Has anyone ever made it work with a STM32WB15 and the polarity Low on a wake-up pin ?

Regards,

Joël

JGuir.1
JGuir.1Author
Associate II
October 27, 2022

Hello,

Please Piranha stop answering my request and instead let ST tech support do it professionally.

Regards,

Joël

Remy ISSALYS
Remy ISSALYS
ST Technical Moderator
November 7, 2022

Hello,

Can you share the code are you using to enter in shutdown mode and to wake up?

Best Regards

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