rpi4-rust-workspace
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Investigate if the 2711 has a different mechanism for pin pull-up/down/enable
- https://github.com/RPi-Distro/raspi-gpio/blob/master/raspi-gpio.c#L194
- https://github.com/rsta2/circle/blob/fe24b6bebd1532f2a0ee981af12eaf50cc9e97fb/include/circle/bcm2835.h#L73
- https://github.com/rsta2/circle/blob/fe24b6bebd1532f2a0ee981af12eaf50cc9e97fb/lib/gpiopin.cpp#L350