Changes in this commit:
- When setting PWM parameters of a FLEXPWM AB channel twice within a PWM
cycle, the second setting was ignored. Now the second setting persists.
- With `duty_u16(0)` a FLEXPWM X channel was set to high impedance. Now it
is set to low impedance with value 0 for `invert=False`, and 1 for
`invert=True`.
- The align parameter requires a duty rate and frequency to be set. Align
will now be ignored if freq or duty are missing.
Signed-off-by: robert-hh <robert@hammelrath.com>
e2532e0f72