probe_eddy_current: Implement regression test case

Update the code to support simple regression test cases.

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

klippy/extras/ldc1612.py

@@ -138,6 +138,8 @@ class LDC1612:
     def get_mcu(self):
         return self.i2c.get_mcu()
     def read_reg(self, reg):
+        if self.mcu.is_fileoutput():
+            return 0
         params = self.i2c.i2c_read([reg], 2)
         response = bytearray(params['response'])
         return (response[0] << 8) | response[1]
@@ -155,8 +157,6 @@ class LDC1612:
             [self.oid, clock, tfreq, trsync_oid, hit_reason, err_reason])
     def clear_home(self):
         self.ldc1612_setup_home_cmd.send([self.oid, 0, 0, 0, 0, 0])
-        if self.mcu.is_fileoutput():
-            return 0.
         params = self.query_ldc1612_home_state_cmd.send([self.oid])
         tclock = self.mcu.clock32_to_clock64(params['trigger_clock'])
         return self.mcu.clock_to_print_time(tclock)
@@ -200,7 +200,8 @@ class LDC1612:
         # noise or wrong signal as a correctly initialized device
         manuf_id = self.read_reg(REG_MANUFACTURER_ID)
         dev_id = self.read_reg(REG_DEVICE_ID)
-        if manuf_id != LDC1612_MANUF_ID or dev_id != LDC1612_DEV_ID:
+        if ((manuf_id != LDC1612_MANUF_ID or dev_id != LDC1612_DEV_ID)
+            and not self.mcu.is_fileoutput()):
             raise self.printer.command_error(
                 "Invalid ldc1612 id (got %x,%x vs %x,%x).\n"
                 "This is generally indicative of connection problems\n"

klippy/extras/probe_eddy_current.py

@@ -313,6 +313,13 @@ class EddyGatherSamples:
             if est_print_time > end_time + 1.0:
                 raise self._printer.command_error(
                     "probe_eddy_current sensor outage")
+            if mcu.is_fileoutput():
+                # In debugging mode
+                if pos_time is not None:
+                    toolhead_pos = self._lookup_toolhead_pos(pos_time)
+                self._probe_results.append((toolhead_pos[2], toolhead_pos))
+                self._probe_times.pop(0)
+                continue
             reactor.pause(systime + 0.010)
     def _pull_freq(self, start_time, end_time):
         # Find average sensor frequency between time range
@@ -421,7 +428,7 @@ class EddyDescend:
         if res != mcu.MCU_trsync.REASON_ENDSTOP_HIT:
             return 0.
         if self._mcu.is_fileoutput():
-            return home_end_time
+            trigger_time = home_end_time
         self._trigger_time = trigger_time
         return trigger_time
     # Probe session interface
@@ -437,8 +444,6 @@ class EddyDescend:
         # Perform probing move
         phoming = self._printer.lookup_object('homing')
         trig_pos = phoming.probing_move(self, pos, speed)
-        if not self._trigger_time:
-            return trig_pos
         # Extract samples
         start_time = self._trigger_time + 0.050
         end_time = start_time + 0.100

test/klippy/eddy.cfg

@@ -0,0 +1,84 @@
+# Test config for probe_eddy_current
+[stepper_x]
+step_pin: PF0
+dir_pin: PF1
+enable_pin: !PD7
+microsteps: 16
+rotation_distance: 40
+endstop_pin: ^PE5
+position_endstop: 0
+position_max: 200
+homing_speed: 50
+
+[stepper_y]
+step_pin: PF6
+dir_pin: !PF7
+enable_pin: !PF2
+microsteps: 16
+rotation_distance: 40
+endstop_pin: ^PJ1
+position_endstop: 0
+position_max: 200
+homing_speed: 50
+
+[stepper_z]
+step_pin: PL3
+dir_pin: PL1
+enable_pin: !PK0
+microsteps: 16
+rotation_distance: 8
+endstop_pin: probe:z_virtual_endstop
+position_max: 200
+
+[extruder]
+step_pin: PA4
+dir_pin: PA6
+enable_pin: !PA2
+microsteps: 16
+rotation_distance: 33.5
+nozzle_diameter: 0.400
+filament_diameter: 1.750
+heater_pin: PB4
+sensor_type: EPCOS 100K B57560G104F
+sensor_pin: PK5
+control: pid
+pid_Kp: 22.2
+pid_Ki: 1.08
+pid_Kd: 114
+min_temp: 0
+max_temp: 250
+
+[heater_bed]
+heater_pin: PH5
+sensor_type: EPCOS 100K B57560G104F
+sensor_pin: PK6
+control: watermark
+min_temp: 0
+max_temp: 130
+
+[probe_eddy_current eddy]
+z_offset: 0.4
+x_offset: -5
+y_offset: -4
+sensor_type: ldc1612
+speed: 10.0
+intb_pin: PK7
+
+[bed_mesh]
+mesh_min: 10,10
+mesh_max: 180,180
+
+[mcu]
+serial: /dev/ttyACM0
+
+[printer]
+kinematics: cartesian
+max_velocity: 300
+max_accel: 3000
+max_z_velocity: 5
+max_z_accel: 100
+
+# Dummy calibration data
+[probe_eddy_current eddy]
+calibrate =
+    0.050000:3300000.000,1.000000:3200000.000,5.000000:3000000.000

test/klippy/eddy.test

@@ -0,0 +1,30 @@
+# Test case for probe_eddy_current support
+CONFIG eddy.cfg
+DICTIONARY atmega2560.dict
+
+# Start by homing the printer.
+G28
+G1 F6000
+
+# Z / X / Y moves
+G1 Z1
+G1 X1
+G1 Y1
+
+# Run bed_mesh_calibrate
+BED_MESH_CALIBRATE
+
+G1 Z2
+BED_MESH_CALIBRATE METHOD=scan
+
+G1 Z2
+BED_MESH_CALIBRATE METHOD=rapid_scan
+
+# Move again
+G1 Z5 X0 Y0
+
+# Do regular probe
+PROBE
+
+# Move again
+G1 Z9