David Grayson f80d040c03 rp2/modrp2: Disable other core, shorten delay to 8us in bootsel_button.
This function seems to work fine in multi-core applications now.

The delay is now in units of microseconds instead of depending on the clock
speed, and is adjustable by board configuration headers.

Also added documentation.
2023-03-09 11:44:20 +11:00
..