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Add UNKNOWN_Z_NO_RAISE option

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With this option enabled, Z won't ever be raised until after `G28` has been completed, and it won't raise if Z becomes unknown. This is good for machines whose beds fall when Z is powered off.
This commit is contained in:
Scott Lahteine
2018-03-09 23:18:47 -06:00
parent 3b4c89e4b5
commit 419d12ca1b
3 changed files with 25 additions and 9 deletions
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10
Marlin/src/gcode/calibrate/G28.cpp
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@ -221,9 +221,15 @@ void GcodeSuite::G28(const bool always_home_all) {
#endif
if (home_all || homeX || homeY) {
#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
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)
destination[Z_AXIS] = Z_HOMING_HEIGHT;
destination[Z_AXIS] = z_homing_height;
if (destination[Z_AXIS] > current_position[Z_AXIS]) {
#if ENABLED(DEBUG_LEVELING_FEATURE)