Fixes#169
Trying to change pinout while running, or to an illegal configuration,
will now immediately panic() with an error message. Such an attempt
is a pretty big problem since pinouts are hardware related/static.
Prior code would fail silently and return false, but nobody checked
the setXXX return values, anyway.
Fixes#167
For Serial when selecting TinyUSB. Can't include in the core because Arduino IDE
will not link in libraries called from the core. Instead, add the header to all
the standard libraries in the hope it will still catch some user cases where they
use these libraries.
See https://github.com/earlephilhower/arduino-pico/issues/167#issuecomment-848622174
Fix the drive logic for pullup and pulldown inputs.
Add a bitbanged I2C ACK checker for 0-byte I2C transfers (since the HW
doesn't support it).
Add a timeout on I2C reads and writes so they don't hang forever if a
device is not present.
Fixes#38
Use a constexpr template to calculate the valid pins for different IO
hardware. This lets us have an easily readable list of pin numbers that
we can adjust/check.
Earle F. Philhower, III