mcu: Raise an error on a failed home_wait() call

Raise a printer.command_error exception if a home_wait() call fails.
This makes it easier to support future types of homing errors.

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>

klippy/extras/bltouch.py

@@ -116,7 +116,11 @@ class BLTouchEndstopWrapper:
         self.mcu_endstop.home_start(self.action_end_time, ENDSTOP_SAMPLE_TIME,
                                     ENDSTOP_SAMPLE_COUNT, ENDSTOP_REST_TIME,
                                     triggered=triggered)
-        trigger_time = self.mcu_endstop.home_wait(self.action_end_time + 0.100)
+        try:
+            trigger_time = self.mcu_endstop.home_wait(
+                self.action_end_time + 0.100)
+        except self.printer.command_error as e:
+            return False
         return trigger_time > 0.
     def raise_probe(self):
         self.sync_mcu_print_time()

klippy/extras/homing.py

@@ -98,11 +98,14 @@ class HomingMove:
         trigger_times = {}
         move_end_print_time = self.toolhead.get_last_move_time()
         for mcu_endstop, name in self.endstops:
-            trigger_time = mcu_endstop.home_wait(move_end_print_time)
+            try:
+                trigger_time = mcu_endstop.home_wait(move_end_print_time)
+            except self.printer.command_error as e:
+                if error is None:
+                    error = "Error during homing %s: %s" % (name, str(e))
+                continue
             if trigger_time > 0.:
                 trigger_times[name] = trigger_time
-            elif trigger_time < 0. and error is None:
-                error = "Communication timeout during homing %s" % (name,)
             elif check_triggered and error is None:
                 error = "No trigger on %s after full movement" % (name,)
         # Determine stepper halt positions

klippy/extras/probe_eddy_current.py

@@ -243,8 +243,9 @@ class EddyEndstopWrapper:
         trigger_time = self._sensor_helper.clear_home()
         self._stop_measurements(is_home=True)
         res = self._dispatch.stop()
-        if res == mcu.MCU_trsync.REASON_COMMS_TIMEOUT:
-            return -1.
+        if res >= mcu.MCU_trsync.REASON_COMMS_TIMEOUT:
+            raise self._printer.command_error(
+                "Communication timeout during homing")
         if res != mcu.MCU_trsync.REASON_ENDSTOP_HIT:
             return 0.
         if self._mcu.is_fileoutput():