wake from WFI and *immediately* execute my code ??

[Goof Ball]

__WFI works beauty. But I want more. Behold:

void vApplicationIdleHook() {
	__WFI();
     my_own_code();  // on wake, this will be executed *after* the intr handler :(
}

Upon every wake from WFI, I want to execute my own code immediately: ie. before any intr handler, and before any other threads.

I could slap "my_own_code();" into the top of *every* interrupt handler... but that is too much work.

Anyone have any ideas?

[berendi · Accepted solution]

void vApplicationIdleHook() {
    __disable_irq();
    __WFI();
    my_own_code();
    __enable_irq();
}

[Goof Ball]

@berendi​ Thanks man! You are totally the dude of the day. Works great!

The disturbing question, of course, is how come I couldn't figger that out myself...

[Piranha]

And also in case of Cortex-M7 and older Cortex-M3 cores a __DSB(); must be added immediately before __WFI();.

http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.dai0321a/BIHICBGB.html

https://developer.arm.com/docs/103490176/latest/does-the-cortex-m3-or-cortex-m4-processor-need-memory-barrier-instructions