Fixes G29_with_retry behavior (#11045)

* Fix G29 (ABL) retry behavior

Marlin/src/gcode/bedlevel/abl/G29.cpp

@@ -62,6 +62,12 @@
   #endif
 #endif
 
+#if ENABLED(G29_RETRY_AND_RECOVER)
+  #define G29_RETURN(b) return b;
+#else
+  #define G29_RETURN(b) return;
+#endif 
+
 /**
  * G29: Detailed Z probe, probes the bed at 3 or more points.
  *      Will fail if the printer has not been homed with G28.
@@ -136,7 +142,7 @@
  *     There's no extra effect if you have a fixed Z probe.
  *
  */
-void GcodeSuite::G29() {
+G29_TYPE GcodeSuite::G29() {
 
   #if ENABLED(DEBUG_LEVELING_FEATURE) || ENABLED(PROBE_MANUALLY)
     const bool seenQ = parser.seen('Q');
@@ -154,7 +160,7 @@ void GcodeSuite::G29() {
     }
     marlin_debug_flags = old_debug_flags;
     #if DISABLED(PROBE_MANUALLY)
-      if (seenQ) return;
+      if (seenQ) G29_RETURN(false);
     #endif
   #endif
 
@@ -174,7 +180,7 @@ void GcodeSuite::G29() {
               ;
 
   // Don't allow auto-leveling without homing first
-  if (axis_unhomed_error()) return;
+  if (axis_unhomed_error()) G29_RETURN(false);
 
   if (!no_action && planner.leveling_active && parser.boolval('O')) { // Auto-level only if needed
     #if ENABLED(DEBUG_LEVELING_FEATURE)
@@ -183,7 +189,7 @@ void GcodeSuite::G29() {
         SERIAL_ECHOLNPGM("<<< G29");
       }
     #endif
-    return;
+    G29_RETURN(false);
   }
 
   // Define local vars 'static' for manual probing, 'auto' otherwise
@@ -285,14 +291,14 @@ void GcodeSuite::G29() {
         if (!leveling_is_valid()) {
           SERIAL_ERROR_START();
           SERIAL_ERRORLNPGM("No bilinear grid");
-          return;
+          G29_RETURN(false);
         }
 
         const float rz = parser.seenval('Z') ? RAW_Z_POSITION(parser.value_linear_units()) : current_position[Z_AXIS];
         if (!WITHIN(rz, -10, 10)) {
           SERIAL_ERROR_START();
           SERIAL_ERRORLNPGM("Bad Z value");
-          return;
+          G29_RETURN(false);
         }
 
         const float rx = RAW_X_POSITION(parser.linearval('X', NAN)),
@@ -316,7 +322,7 @@ void GcodeSuite::G29() {
           set_bed_leveling_enabled(abl_should_enable);
           if (abl_should_enable) report_current_position();
         }
-        return;
+        G29_RETURN(false);
       } // parser.seen('W')
 
     #else
@@ -328,13 +334,13 @@ void GcodeSuite::G29() {
     // Jettison bed leveling data
     if (!seen_w && parser.seen('J')) {
       reset_bed_level();
-      return;
+      G29_RETURN(false);
     }
 
     verbose_level = parser.intval('V');
     if (!WITHIN(verbose_level, 0, 4)) {
       SERIAL_PROTOCOLLNPGM("?(V)erbose level is implausible (0-4).");
-      return;
+      G29_RETURN(false);
     }
 
     dryrun = parser.boolval('D')
@@ -355,11 +361,11 @@ void GcodeSuite::G29() {
 
       if (!WITHIN(abl_grid_points_x, 2, GRID_MAX_POINTS_X)) {
         SERIAL_PROTOCOLLNPGM("?Probe points (X) is implausible (2-" STRINGIFY(GRID_MAX_POINTS_X) ").");
-        return;
+        G29_RETURN(false);
       }
       if (!WITHIN(abl_grid_points_y, 2, GRID_MAX_POINTS_Y)) {
         SERIAL_PROTOCOLLNPGM("?Probe points (Y) is implausible (2-" STRINGIFY(GRID_MAX_POINTS_Y) ").");
-        return;
+        G29_RETURN(false);
       }
 
       abl_points = abl_grid_points_x * abl_grid_points_y;
@@ -392,7 +398,7 @@ void GcodeSuite::G29() {
         #endif
       ) {
         SERIAL_PROTOCOLLNPGM("? (L,R,F,B) out of bounds.");
-        return;
+        G29_RETURN(false);
       }
 
       // probe at the points of a lattice grid
@@ -417,7 +423,7 @@ void GcodeSuite::G29() {
       // Deploy the probe. Probe will raise if needed.
       if (DEPLOY_PROBE()) {
         set_bed_leveling_enabled(abl_should_enable);
-        return;
+        G29_RETURN(false);
       }
     #endif
 
@@ -494,7 +500,7 @@ void GcodeSuite::G29() {
         SERIAL_PROTOCOLLNPGM("idle");
     }
 
-    if (no_action) return;
+    if (no_action) G29_RETURN(false);
 
     if (abl_probe_index == 0) {
       // For the initial G29 S2 save software endstop state
@@ -584,7 +590,7 @@ void GcodeSuite::G29() {
           // If G29 is not completed, they will not be re-enabled
           soft_endstops_enabled = false;
         #endif
-        return;
+        G29_RETURN(false);
       }
       else {
 
@@ -610,7 +616,7 @@ void GcodeSuite::G29() {
           // If G29 is not completed, they will not be re-enabled
           soft_endstops_enabled = false;
         #endif
-        return;
+        G29_RETURN(false);
       }
       else {
 
@@ -990,6 +996,8 @@ void GcodeSuite::G29() {
   #endif
 
   report_current_position();
+  
+  G29_RETURN(isnan(measured_z));
 }
 
 #endif // OLDSCHOOL_ABL

Marlin/src/gcode/gcode.cpp

@@ -61,11 +61,6 @@ bool GcodeSuite::axis_relative_modes[] = AXIS_RELATIVE_MODES;
   float GcodeSuite::coordinate_system[MAX_COORDINATE_SYSTEMS][XYZ];
 #endif
 
-#if HAS_LEVELING && ENABLED(G29_RETRY_AND_RECOVER)
-  #include "../feature/bedlevel/bedlevel.h"
-  #include "../module/planner.h"
-#endif
-
 /**
  * Set target_extruder from the T parameter or the active_extruder
  *
@@ -136,11 +131,14 @@ void GcodeSuite::dwell(millis_t time) {
  */
 #if HAS_LEVELING && ENABLED(G29_RETRY_AND_RECOVER)
 
+  #ifndef G29_MAX_RETRIES
+    #define G29_MAX_RETRIES 0
+  #endif
+   
   void GcodeSuite::G29_with_retry() {
-    set_bed_leveling_enabled(false);
-    for (uint8_t retries_left = G29_MAX_RETRIES;;) {
-      G29();
-      if (planner.leveling_active || !retries_left--) break;
+    uint8_t retries = G29_MAX_RETRIES;
+    while (G29()) { // G29 should return true for failed probes ONLY
+      if (retries--) {
         #ifdef G29_ACTION_ON_RECOVER
           SERIAL_ECHOLNPGM("//action:" G29_ACTION_ON_RECOVER);
         #endif
@@ -148,11 +146,6 @@ void GcodeSuite::dwell(millis_t time) {
           process_subcommands_now_P(PSTR(G29_RECOVER_COMMANDS));
         #endif   
       }
-    if (planner.leveling_active) {
-      #ifdef G29_SUCCESS_COMMANDS
-        process_subcommands_now_P(PSTR(G29_SUCCESS_COMMANDS));
-      #endif
-    }
       else {
         #ifdef G29_FAILURE_COMMANDS
           process_subcommands_now_P(PSTR(G29_FAILURE_COMMANDS));
@@ -163,7 +156,12 @@ void GcodeSuite::dwell(millis_t time) {
         #if ENABLED(G29_HALT_ON_FAILURE)
           kill(PSTR(MSG_ERR_PROBING_FAILED));
         #endif
+        return;
+      }
     }
+    #ifdef G29_SUCCESS_COMMANDS
+      process_subcommands_now_P(PSTR(G29_SUCCESS_COMMANDS));
+    #endif
   }
 
 #endif // HAS_LEVELING && G29_RETRY_AND_RECOVER

Marlin/src/gcode/gcode.h

@@ -387,10 +387,13 @@ private:
   static void G28(const bool always_home_all);
 
   #if HAS_LEVELING
-    static void G29();
     #if ENABLED(G29_RETRY_AND_RECOVER)
       static void G29_with_retry();
+      #define G29_TYPE bool
+    #else
+      #define G29_TYPE void
     #endif
+    static G29_TYPE G29();
   #endif
 
   #if HAS_BED_PROBE

Marlin/src/inc/SanityCheck.h

@@ -936,6 +936,10 @@ static_assert(X_MAX_LENGTH >= X_BED_SIZE && Y_MAX_LENGTH >= Y_BED_SIZE,
   #error "MESH_EDIT_GFX_OVERLAY requires AUTO_BED_LEVELING_UBL and a Graphical LCD."
 #endif
 
+#if ENABLED(G29_RETRY_AND_RECOVER) && HAS_LEVELING && !OLDSCHOOL_ABL
+  #error "G29_RETRY_AND_RECOVER currently only supports ABL"
+#endif
+
 /**
  * LCD_BED_LEVELING requirements
  */