Arduino for STM32

Also, your OP is about F411? why talking about F7 ? F7 included because then I tried the same code with 3 boards, including F767zi with follow summary results: - stm32f103 ( correct ) - stm32f446re ( problem ) - stm32f767zi ( problem ) actually I have wires connected to F7. You could not compare mb...

I think that stm32duino sets everything for their need to tune F_CPU 216000000 but may I am wrong...
I not used cubemx btw for stm32f767zi following is the default clock config

btw, with higher freqs 10khz computed values isn't stable even within this framework I'm sorry I seen from the scope that the instability in the signal was coming from the signal generator itself, so I setup a more stable pwm generator at 10khz signal using an stm32f108 and then I compared stm32dui...

Maybe you find interesting to measure a pulse width using hardware timer from this example: https://github.com/rogerclarkmelbourne/ ... MInput.ino Thanks again stevestrong for the hint, I'll sure give a try. Meanwhile I managed to make it work using another framework mbed, that was not my original ...

thanks you stevestrong for suggestions, I tried but the results still the same, even with another board with stm32-f767zi; only two notes about what you pointed: 1) call micros only one time, I achieved this already in my initial code because of the `if` branch micros() will be executed only 1 time ...

Thanks for suggestion, I tried moving millis() to the top but nothing changes, stm32f446re runs 180Mhz and I got the problem explained while with stm32f103 running at 72Mhz or ArduinoNano at 16Mhz the problem not appears. I don't understand exactly why an higher mcu freq should cause 20us distance f...

I am unable to retrieve a correct value of micros(), following my setup: - STM32F411RE mcu - external frequency generated by a pwm 50% duty connected to PC2 - in the hardware interrupt routine I save delta of micros() into a E1_period_us variable - for testing purpose I setup PC10 output pin when in...