Stepcraft controller

/* cpu_map.h */

// The Stepcraft has all limits on one pin.
#define X_LIMIT_BIT    1  // Uno Digital Pin 9
#define Y_LIMIT_BIT    1  // Uno Digital Pin 9
#define Z_LIMIT_BIT    1  // Uno Digital Pin 9

/* config.h */

// Since all limit switches end up being shared on one pin,
// we can only home one direction at a time.
#define HOMING_CYCLE_0 (1<<Z_AXIS)  // REQUIRED: First move Z to clear workspace.
#define HOMING_CYCLE_1 (1<<Y_AXIS)  // OPTIONAL: Then move X,Y at the same time.
#define HOMING_CYCLE_2 (1<<X_AXIS)  // OPTIONAL: Uncomment and add axes mask to enable

// The stop output of the Stepcraft board is inverted to what GRBL expects.
// However you simply can't swap the switch because the driver board will also
// disable the motors so nothing will move.
#define INVERT_CONTROL_PIN_MASK (1<<CONTROL_RESET_BIT) // Default disabled.

$0 = 50				(Step pulse time, microseconds)
$1 = 100			(Step idle delay, milliseconds)
$2 = 0				(Step pulse invert, mask)
$3 = 0				(Step direction invert, mask)
$4 = 1				(Invert step enable pin, boolean)
$5 = 1				(Invert limit pins, boolean)
$6 = 0				(Invert probe pin, boolean)
$10 = 1				(Status report options, mask)
$11 = 0.010			(Junction deviation, millimeters)
$12 = 0.002			(Arc tolerance, millimeters)
$13 = 0				(Report in inches, boolean)
$20 = 0				(Soft limits enable, boolean)
$21 = 0				(Hard limits enable, boolean)
$22 = 1				(Homing cycle enable, boolean)
$23 = 1				(Homing direction invert, mask)
$24 = 120.000		(Homing locate feed rate, mm/min)
$25 = 900.000		(Homing search seek rate, mm/min)
$26 = 250			(Homing switch debounce delay, milliseconds)
$27 = 1.000			(Homing switch pull-off distance, millimeters)
$30 = 1000			(Maximum spindle speed, RPM)
$31 = 0				(Minimum spindle speed, RPM)
$32 = 0				(Laser-mode enable, boolean)
$100 = 133.333		(X-axis travel resolution, step/mm)
$101 = 133.333		(Y-axis travel resolution, step/mm)