SPRUIW8 November 2020
By default GPIO39 is routed to pin 53 of BoosterPack header J8/J6. Alternatively, GPIO39 can be routed to pin 32 of BoosterPack header J4/J2 by populating 0 ohm resistor R69. R71 can then be removed to isolate the signal from the J8/J6 header if desired.