Show polarity in pwm command

pytec/pytec/client.py

@@ -57,12 +57,14 @@ class Client:
               'max_i_neg': {'max': 3.0, 'value': 3.0},
               'max_v': {'max': 5.988, 'value': 5.988},
               'max_i_pos': {'max': 3.0, 'value': 3.0}},
+              'polarity': 'normal',
              {'channel': 1,
               'center': 'vref',
               'i_set': {'max': 2.9802790335151985, 'value': -0.02002179650216762},
               'max_i_neg': {'max': 3.0, 'value': 3.0},
               'max_v': {'max': 5.988, 'value': 5.988},
               'max_i_pos': {'max': 3.0, 'value': 3.0}}
+              'polarity': 'normal',
             ]
         """
         return self._get_conf("pwm")

src/channels.rs

@@ -545,6 +545,7 @@ impl Channels {
             max_v: self.get_max_v(channel).into(),
             max_i_pos: self.get_max_i_pos(channel).into(),
             max_i_neg: self.get_max_i_neg(channel).into(),
+            polarity: PolarityJson(self.channel_state(channel).polarity.clone()),
         }
     }
 
@@ -626,6 +627,21 @@ impl Serialize for CenterPointJson {
     }
 }
 
+pub struct PolarityJson(Polarity);
+
+// used in JSON encoding, not for config
+impl Serialize for PolarityJson {
+    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
+    where
+        S: Serializer,
+    {
+        serializer.serialize_str(match self.0 {
+            Polarity::Normal => "normal",
+            Polarity::Reversed => "reversed",
+        })
+    }
+}
+
 #[derive(Serialize)]
 pub struct PwmSummaryField<T: Serialize> {
     value: T,
@@ -646,6 +662,7 @@ pub struct PwmSummary {
     max_v: PwmSummaryField<ElectricPotential>,
     max_i_pos: PwmSummaryField<ElectricCurrent>,
     max_i_neg: PwmSummaryField<ElectricCurrent>,
+    polarity: PolarityJson,
 }
 
 #[derive(Serialize)]