robert-hh 3d9940bc28 samd/mphalport: Add pin open-drain funcs, and improve delay and ticks.
The changes in this commit are:
- Add an interface for pin open-drain mode.
- Improve ticks_us() by using the us-counter.
- Improve ticks_cpu() by using the CPU's SysTick.
2022-10-06 22:35:06 +11:00
..