Detect calling context (ISR or task)

Kernel
1

Hello

I need to provide a way to an external library to stop timers.
The problems is that it call it from interruptions or not.
In my stopTimer function, that I need to provide, if I’m calling xTimerStopFromISR or xTimerStop in the wrong context, I’m going into an error.

Would you have a solution for this?

Maybe I’m not seeing another way of doing it…

Thank you
CBL

2

What if following the FreeRTOS convention and provide stopTimer and stopTimerFromISR ?

3

Thanks for your answer.
Sadly, I can’t modify the library that is calling stopTimer

4

Ahh … you’ve to provide a callback with a fixed API…
To the rescue some ports as Cortex-M3/4 provide xPortIsInsideInterrupt() in portmacro.h which can be used to detect ISR context. AFAIK some other 3rd party libs use this mechanism to provide generic APIs, too.

5

Exactly…
Thank you, that should do the job! I am using an STM32L746 so it should be Cortex M4 but I can’t find it in my portmacro.h. I will dig into this! Thank you for your help!

6

Here it is - https://github.com/FreeRTOS/FreeRTOS-Kernel/blob/main/portable/GCC/ARM_CM4F/portmacro.h#L172

7

Thank you for your help, I have included it inside my portmacro.h and it works perfectly!

8

The identical function could be made available for the M0, if anyone wanted it enough