- Remove `print_job_timer.stop()` from `disable_all_heaters`
- Call `print_job_timer.stop()` for relevant `disable_all_heaters()`.
- Split up `kill()` for watchdog interrupt safety
To allow for the case where a Z endstop (e.g., hall effect) is higher than the probe trigger point, don't check the Z min endstop during probe moves. See #11134
* Misc fixes and improvements
- Get rid of most critical sections on the Serial port drivers for AVR and DUE. Proper usage of FIFOs should allow interrupts to stay enabled without harm to queuing and dequeuing.
Also, with 8-bit indices (for AVR) and up to 32-bit indices (for ARM), there is no need to protect reads and writes to those indices.
- Simplify the XON/XOFF logic quite a bit. Much cleaner now (both for AVR and ARM)
- Prevent a race condition (edge case) that could happen when estimating the proper value for the stepper timer (by reading it) and writing the calculated value for the time to the next ISR by disabling interrupts in those critical and small sections of the code - The problem could lead to lost steps.
- Fix dual endstops not properly homing bug (maybe).
* Set position immediately when possible
1. The CORExx printers were checking more endstop axis than needed.
2. Removed all the CORE_xx_NOT logic. The motor_direction(xx) routine
always returns the correct data so it is not needed. It was actually
cause the wrong direction to be checked in some cases.
3. Made the logic/defines for X, Y & Z axis all the same. The old logic
checked inappropriate configurations for Y and didn't check all the
correct configurations on Z.
4. Added a check for zero steps before the X, Y & Z axis. Previously
would check the they axis even if there were no movement.