probe.h - code pertaining to probing methods
Part of Grbl v0.9
Copyright (c) 2014 Sungeun K. Jeon
Grbl is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
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// Values that define the probing state machine.
#define PROBE_OFF 0 // No probing. (Must be zero.)
#define PROBE_ACTIVE 1 // Actively watching the input pin.
// Probe pin initialization routine.
// Returns probe pin state.
// Monitors probe pin state and records the system position when detected. Called by the
// stepper ISR per ISR tick.