Add mcu support for periodically polling for a button press. Add host
code support for registering buttons and invoking callbacks for them.
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
Allow the micro-controller code to be built without support for
regular gpio pins. In this case, the code for endstops, steppers, and
gpiocmds will be disabled.
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
Some boards may not support hardware based PWM. Update the build so
that those commands do not need to be compiled if they are not
available.
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
Some boards may not support SPI transfers. Update the build so that
those commands do not need to be compiled if they are not available.
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
Some boards may not support the ADC hardware. Update the build so
that those commands do not need to be compiled if they are not
available.
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
Kevin O'Connor