Arduino for STM32

I don't think that the CPU is able to perform faster than 500kHz IRQ frequency. The 72MHz is a theoretical value, but in practice it takes 0.5µs to enter and leave the ISR. And reading the code is done with some wait states which is adding some extra execution time if the code needs several jumps. S...

A big thanks to Frederik from my side, too.
And hello to everybody, good to have our "daily meeting place" back again.