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This application tries to help finding elecrical shorts in the dev-bridge
board by configuring all pins but one at a time as input (pull-down), and
then outputing a bit to one pin and checking that none of the input pins
go high.
Usage:
Flash it
picocom -b 115200 /dev/ttyUSB0
You should see nothing but line feeds in the terminal emulator.
Red LED should stay OFF.
Blue and green LED should toggle (in tandem).
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