Hi ST Community,
I am currently trying to evaluate if I can use EXTI GPIO IRQ handlers (function executed at USER BUTTON press) in combination with the STOP3 sleep mode.
Firstly, I would like to request, if this is supported by the u5 CPU. Based on the reference manual, only a WKUP interrupt can wake up the CPU from STOP3 mode. So is the following scenario realizable?
1) CPU configures EXTI GPIO (USER BUTTON) with IRQ handler/function
2) CPU goes into STOP3
3) User presses USER BUTTON
4) CPU leaks STOP3 (WKUP interrupt)
5) CPU executes EXIT GPIO IRQ after wake up
6) CPU goes pack to STOP3 and waits for next wake up
7) <infinite loop from 2.>
Or are the WKUP and EXTI GPIO interrupts exclusive? (only one can occur).
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Unfortunately, it seems that this sample is not covered by the cube IDE samples.
Or have I overlooked one?
So I have looked at the sample GPIO_EXTI sample (https://github.com/STMicroelectronics/STM32CubeU5/tree/main/Projects/NUCLEO-U575ZI-Q/Examples/GPIO/GPIO_EXTI). But this sample does not use the stop3 mode.
So I would like to ask, if somebody can provide me a read to use sample or may help me to understand, if I can enable stop3 via Cube MX application.
Thanks in advise.
Best regards,
Andreas
