Calling a C function from Assembly

[giltal]

ESP32:
I have an interrupt service routine written in Assembly
I am trying to call a C function and get a double exception error.
Any Idea?

movi a14, intFunc
callx0 a14

extern "C" void IRAM_ATTR intFunc()
{
counter2++;
}

[ESP_Sprite]

The ESP32 uses the windowed ABI; rather than callx0 you should use one of callx4, callx8 or callx12. Note that if you want to pass arguments to the C function, this also shifts the registers these argument are passed in.

[giltal]

Thanks for your answer ...
I am aware of it
Tried all options, still same starnge behaviuor