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Add R parameter to G28 to specify pre-raise

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This commit is contained in:
Scott Lahteine 2018-04-21 16:04:41 -05:00
parent 61f9e28c23
commit 1894b981af
1 changed files with 8 additions and 5 deletions
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13
Marlin/Marlin_main.cpp
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@ -3994,6 +3994,8 @@ inline void gcode_G4() {
* None Home to all axes with no parameters.
* With QUICK_HOME enabled XY will home together, then Z.
*
* Rn Raise by n mm/inches before homing
*
* Cartesian parameters
*
* X Home to the X endstop
@ -4068,11 +4070,12 @@ inline void gcode_G28(const bool always_home_all) {
#endif
#if ENABLED(UNKNOWN_Z_NO_RAISE)
const float z_homing_height = axis_known_position[Z_AXIS] ? Z_HOMING_HEIGHT : 0;
#else
constexpr float z_homing_height = Z_HOMING_HEIGHT;
#endif
const float z_homing_height = (
#if ENABLED(UNKNOWN_Z_NO_RAISE)
!axis_known_position[Z_AXIS] ? 0 :
#endif
(parser.seenval('R') ? parser.value_linear_units() : Z_HOMING_HEIGHT)
);
if (z_homing_height && (home_all || homeX || homeY)) {
// Raise Z before homing any other axes and z is not already high enough (never lower z)