Validating frequency of external crystals

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Joined: Fri Sep 01, 2017 3:50 pm

Validating frequency of external crystals

Postby SomeCallMeTim » Thu May 21, 2020 2:13 pm


I'm looking for a way to validate the operating frequency of the 40MHz crystal in one of our designs attached to a ESP32-D0WDQ6. Is there a way to output the 40MHz clock onto a pin on the system? I see that you can for the 32kHz clock, although, that isn't documented in the technical reference manual at all (inside componnents/soc/esp32/test it pokes at some undocumented registers to do this).

Thanks in advance!

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