minor UI tweaks

- fixed bug where log data could not be cleared after saving to file
- added description for coil constant in settings page
- minor message tweaks

User_Interface.py

@@ -574,7 +574,8 @@ class Configuration(Frame):
         # Setup dictionary to generate entry table from
         # {Key: [[x-value,y-value,z-value], unit, description, config file key, unit conversion factor]}
         self.entries = {
-            "Coil Constants:": [[DoubleVar() for _ in range(3)], "\u03BCT/A", "", "coil_const", 1e6],
+            "Coil Constants:": [[DoubleVar() for _ in range(3)], "\u03BCT/A", "Field generated per applied current",
+                                "coil_const", 1e6],
             "Ambient Field:": [[DoubleVar() for _ in range(3)], "\u03BCT",
                                "Field to be compensated", "ambient_field", 1e6],
             "Resistances:": [[DoubleVar() for _ in range(3)], "\u03A9",
@@ -958,18 +959,22 @@ class ConfigureLogging(Frame):
 
     def clear_data(self):  # called on button press, asks user if he want to save logged data and then deletes it
         if log.unsaved_data:  # there is logged data that has not been written to a file yet
-            # open pop-up to ask user if he wants to save the data:
+            # open pop-up to ask user if he wants to save the data or cancel clearing it:
             save_log = messagebox.askyesnocancel("Save log data?", "There seems to be unsaved logging data. "
                                                                    "Do you wish to write it to a file before deleting?")
             if save_log:  # user has chosen yes
                 self.write_to_file()  # run write to file function to save data
-            if save_log is not None:
+            if save_log is not None:  # user has chosen yes or no (not cancel)
                 log.clear_logged_data()  # delete the logged data
                 log.unsaved_data = False  # tell everything that there is no unsaved data remaining
                 self.logged_datapoints.set(len(log.log_data))  # update the label showing how much data has been logged
                 ui_print("Log data cleared.")
-            else:
+            else:  # user has chosen to cancel
                 ui_print("Log data not cleared.")
+        else:  # there is no unsaved data
+            log.clear_logged_data()  # delete the logged data
+            self.logged_datapoints.set(len(log.log_data))  # update the label showing how much data has been logged
+            ui_print("Log data cleared.")
 
     def update_choices(self):  # updates the list storing which checkboxes are currently ticked
         # (this is passed to logging functions and determines which data is logged)
@@ -1092,6 +1097,7 @@ class StatusDisplay(Frame):
             self.label_dict["Trgt. Field Raw:"][i].set("%0.3f \u03BCT" % (axis.target_field_comp * 1e6))
             self.label_dict["Target Current:"][i].set("%0.3f A" % axis.target_current)
             self.label_dict["Inverted:"][i].set(axis.polarity_switched)
+            print(axis.name, axis.polarity_switched)
             i += 1