probe_eddy_current: Add support for probing in "scan" mode

When probing in "scan" mode, the toolhead will pause at each position,
but does not descend.  This can notably reduce the total probing time.

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

klippy/extras/probe.py

@@ -438,7 +438,7 @@ def start_probe(self, gcmd):
         def_move_z = self.default_horizontal_move_z
         self.horizontal_move_z = gcmd.get_float('HORIZONTAL_MOVE_Z',
                                                 def_move_z)
-        if probe is None or method != 'automatic':
+        if probe is None or method == 'manual':
             # Manual probe
             self.lift_speed = self.speed
             self.probe_offsets = (0., 0., 0.)

klippy/extras/probe_eddy_current.py

@@ -363,6 +363,34 @@ def probe_finish(self, hmove):
     def get_position_endstop(self):
         return self._z_offset
 
+# Implementing probing with "METHOD=scan"
+class EddyScanningProbe:
+    def __init__(self, printer, sensor_helper, calibration, z_offset, gcmd):
+        self._printer = printer
+        self._sensor_helper = sensor_helper
+        self._calibration = calibration
+        self._z_offset = z_offset
+        self._gather = EddyGatherSamples(printer, sensor_helper,
+                                         calibration, z_offset)
+        self._sample_time_delay = 0.050
+        self._sample_time = 0.100
+    def run_probe(self, gcmd):
+        toolhead = self._printer.lookup_object("toolhead")
+        printtime = toolhead.get_last_move_time()
+        toolhead.dwell(self._sample_time_delay + self._sample_time)
+        start_time = printtime + self._sample_time_delay
+        self._gather.note_probe_and_position(
+            start_time, start_time + self._sample_time, start_time)
+    def pull_probed_results(self):
+        results = self._gather.pull_probed()
+        # Allow axis_twist_compensation to update results
+        for epos in results:
+            self._printer.send_event("probe:update_results", epos)
+        return results
+    def end_probe_session(self):
+        self._gather.finish()
+        self._gather = None
+
 # Main "printer object"
 class PrinterEddyProbe:
     def __init__(self, config):
@@ -389,6 +417,11 @@ def get_offsets(self):
     def get_status(self, eventtime):
         return self.cmd_helper.get_status(eventtime)
     def start_probe_session(self, gcmd):
+        method = gcmd.get('METHOD', 'automatic').lower()
+        if method == 'scan':
+            z_offset = self.get_offsets()[2]
+            return EddyScanningProbe(self.printer, self.sensor_helper,
+                                     self.calibration, z_offset, gcmd)
         return self.probe_session.start_probe_session(gcmd)
 
 def load_config_prefix(config):