Clear Interrupts Prior to sleep confusion

Carl_G · ‎2025-03-04

I'm working on getting the STM32G0 to stop mode. Im using WFI so it will wake on interrupt. Right now its immediately waking which is confusing me.

My understanding is that I should __disable_irq() first to prevent the interrupt handlers from being called which would potentially cause you to miss a wakeup flag because the handler cleared it. I can't make sense of this.

with the irq disabled the flag could still get set. Thus, I think I need to disable the IRQ source itself. once the source is disabled then why would I need to call disable_irq?

Unless I should do as follows

1. Disable sources I don't want to wake the MCU
2. disable_irq
3. configure sources I _do_ want to wake the MCU
4. STOP

Is this the correct procedure?

Carl_G · ‎2025-03-04

So much information out here its hard to know what to do. Things work much better without disabling the IRQ at all. And many examples show that __disable_Irq is not used. STM own example does not use disable_irq.