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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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2
Marlin/Configuration.h
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@ -804,6 +804,8 @@
//#define NO_MOTION_BEFORE_HOMING // Inhibit movement until all axes have been homed
//#define UNKNOWN_Z_NO_RAISE // Don't raise Z (lower the bed) if Z is "unknown." For beds that fall when Z is powered off.
//#define Z_HOMING_HEIGHT 4 // (in mm) Minimal z height before homing (G28) for Z clearance above the bed, clamps, ...
// Be sure you have this distance over your Z_MAX_POS in case.

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)

16
Marlin/src/module/probe.cpp
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@ -378,13 +378,21 @@ bool set_probe_deployed(const bool deploy) {
// Make room for probe to deploy (or stow)
// Fix-mounted probe should only raise for deploy
if (
#if ENABLED(FIX_MOUNTED_PROBE)
deploy
const bool deploy_stow_condition = deploy;
#else
true
constexpr bool deploy_stow_condition = true;
#endif
) do_probe_raise(max(Z_CLEARANCE_BETWEEN_PROBES, Z_CLEARANCE_DEPLOY_PROBE));
// For beds that fall when Z is powered off only raise for trusted Z
#if ENABLED(UNKNOWN_Z_NO_RAISE)
const bool unknown_condition = axis_known_position[Z_AXIS];
#else
constexpr float unknown_condition = true;
#endif
if (deploy_stow_condition && unknown_condition)
do_probe_raise(max(Z_CLEARANCE_BETWEEN_PROBES, Z_CLEARANCE_DEPLOY_PROBE));
#if ENABLED(Z_PROBE_SLED) || ENABLED(Z_PROBE_ALLEN_KEY)
#if ENABLED(Z_PROBE_SLED)