digitalReadFast sometimes takes ~1 sec to complete on Teensy 4.1

[jmseight]

Hi,

The following command - lights the LED if pin 11 is HIGH -

digitalWriteFast(13, digitalReadFast(11));

works well most of the time, but once in a while will hang for ~1 sec.

digitalWriteFast(13, digitalRead(11));

does not have the same problem.

Thanks,
James