Make GPIOs start in a Disconnected state
#220
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This should fix #213 by making all GPIO pins start in a new
Disconnectedstate that does not implement any of the embedded-hal traits and needs to be converted to a functional state first.I've also implemented
Channel<Saadc>for all GPIO type states (even output states), which should be correct according to the GPIO schematics in the manual. Using a pin as a SAADC channel will fully switch the pin from the GPIO circuitry to the analog circuitry. This avoids breaking code that passes an uninitialized pin to the SAADC.