Merge in changes @chrisckc debugged while working at 400khz on his own project. See https://github.com/earlephilhower/arduino-pico/issues/979#issuecomment-1328237128
Merge in changes @chrisckc debugged while working at 400khz on his own project. See https://github.com/earlephilhower/arduino-pico/issues/979#issuecomment-1328237128