Is there any way to know the resolution of micros() for the Arduino Portenta H7. I have checked for other boards e.g. Nano which is mentioned as 4 uS. However, I couldn't find one for Portenta H7.
Is there any way to measure or look for that
You can figure out the overhead of micros().
unit32_t firstMicrosReading = micros();
unit32_t secondMicrosReading = micros();
Serial.println( secondsMicrosReading - firstMicrosReading );
will give you the operational resolution you'll get with micros().
The resolution is 1us.
Which can be used to adjust the microsecond drift.
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