PwmLimits: Save user set value into flash

In place of the machine values derived from the PWM duty / center point
calculations

pytec/pytec/client.py

@@ -15,7 +15,7 @@ class Client:
         pwm_report = self.get_pwm()
         for pwm_channel in pwm_report:
             for limit in ["max_i_neg", "max_i_pos", "max_v"]:
-                if pwm_channel[limit] == 0.0:
+                if pwm_channel[limit]["value"] == 0.0:
                     logging.warning("`{}` limit is set to zero on channel {}".format(limit, pwm_channel["channel"]))
 
     def _read_line(self):
@@ -52,16 +52,16 @@ class Client:
         Example::
             [{'channel': 0,
               'center': 'vref',
-              'i_set': -0.02002179650216762,
-              'max_i_neg': 2.0,
-              'max_v': 3.988,
-              'max_i_pos': 2.0,
+              '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}},
              {'channel': 1,
               'center': 'vref',
-              'i_set': -0.02002179650216762,
-              'max_i_neg': 2.0,
-              'max_v': 3.988,
-              'max_i_pos': 2.0}
+              '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}}
             ]
         """
         return self._get_conf("pwm")

src/channels.rs

@@ -361,16 +361,48 @@ impl Channels {
         }
     }
 
-    pub fn get_max_v(&mut self, channel: usize) -> ElectricPotential {
-        ElectricPotential::new::<volt>(self.channel_state(channel).pwm_limits.max_v)
+    fn get_pwm(&self, channel: usize, pin: PwmPin) -> f64 {
+        fn get<P: hal::PwmPin<Duty=u16>>(pin: &P) -> f64 {
+            let duty = pin.get_duty();
+            let max = pin.get_max_duty();
+            duty as f64 / (max as f64)
+        }
+        match (channel, pin) {
+            (_, PwmPin::ISet) =>
+                panic!("i_set is no pwm pin"),
+            (0, PwmPin::MaxIPos) =>
+                get(&self.pwm.max_i_pos0),
+            (0, PwmPin::MaxINeg) =>
+                get(&self.pwm.max_i_neg0),
+            (0, PwmPin::MaxV) =>
+                get(&self.pwm.max_v0),
+            (1, PwmPin::MaxIPos) =>
+                get(&self.pwm.max_i_pos1),
+            (1, PwmPin::MaxINeg) =>
+                get(&self.pwm.max_i_neg1),
+            (1, PwmPin::MaxV) =>
+                get(&self.pwm.max_v1),
+            _ =>
+                unreachable!(),
+        }
     }
 
-    pub fn get_max_i_pos(&mut self, channel: usize) -> ElectricCurrent {
-        ElectricCurrent::new::<ampere>(self.channel_state(channel).pwm_limits.max_i_pos)
+    pub fn get_max_v(&mut self, channel: usize) -> (ElectricPotential, ElectricPotential) {
+        let max = 4.0 * ElectricPotential::new::<volt>(3.3);
+        let duty = self.get_pwm(channel, PwmPin::MaxV);
+        (duty * max, ElectricPotential::new::<volt>(self.channel_state(channel).pwm_limits.max_v))
     }
 
-    pub fn get_max_i_neg(&mut self, channel: usize) -> ElectricCurrent {
-        ElectricCurrent::new::<ampere>(self.channel_state(channel).pwm_limits.max_i_neg)
+    pub fn get_max_i_pos(&mut self, channel: usize) -> (ElectricCurrent, ElectricCurrent) {
+        let max = ElectricCurrent::new::<ampere>(3.0);
+        let duty = self.get_pwm(channel, PwmPin::MaxIPos);
+        (duty * max, ElectricCurrent::new::<ampere>(self.channel_state(channel).pwm_limits.max_i_pos))
+    }
+
+    pub fn get_max_i_neg(&mut self, channel: usize) -> (ElectricCurrent, ElectricCurrent) {
+        let max = ElectricCurrent::new::<ampere>(3.0);
+        let duty = self.get_pwm(channel, PwmPin::MaxINeg);
+        (duty * max, ElectricCurrent::new::<ampere>(self.channel_state(channel).pwm_limits.max_i_neg))
     }
 
     // Get current passing through TEC
@@ -492,10 +524,10 @@ impl Channels {
         PwmSummary {
             channel,
             center: CenterPointJson(self.channel_state(channel).center.clone()),
-            i_set: self.get_i(channel),
-            max_v: self.get_max_v(channel),
-            max_i_pos: self.get_max_i_pos(channel),
-            max_i_neg: self.get_max_i_neg(channel),
+            i_set: (self.get_i(channel), self.channel_state(channel).i_set).into(),
+            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(),
         }
     }
 
@@ -577,14 +609,26 @@ impl Serialize for CenterPointJson {
     }
 }
 
+#[derive(Serialize)]
+pub struct PwmSummaryField<T: Serialize> {
+    value: T,
+    set_value: T,
+}
+
+impl<T: Serialize> From<(T, T)> for PwmSummaryField<T> {
+    fn from((value, set_value): (T, T)) -> Self {
+        PwmSummaryField { value, set_value }
+    }
+}
+
 #[derive(Serialize)]
 pub struct PwmSummary {
     channel: usize,
     center: CenterPointJson,
-    i_set: ElectricCurrent,
-    max_v: ElectricPotential,
-    max_i_pos: ElectricCurrent,
-    max_i_neg: ElectricCurrent,
+    i_set: PwmSummaryField<ElectricCurrent>,
+    max_v: PwmSummaryField<ElectricPotential>,
+    max_i_pos: PwmSummaryField<ElectricCurrent>,
+    max_i_neg: PwmSummaryField<ElectricCurrent>,
 }
 
 #[derive(Serialize)]

src/config.rs

@@ -80,9 +80,9 @@ pub struct PwmLimits {
 
 impl PwmLimits {
     pub fn new(channels: &mut Channels, channel: usize) -> Self {
-        let max_v = channels.get_max_v(channel);
-        let max_i_pos = channels.get_max_i_pos(channel);
-        let max_i_neg = channels.get_max_i_neg(channel);
+        let (_, max_v) = channels.get_max_v(channel);
+        let (_, max_i_pos) = channels.get_max_i_pos(channel);
+        let (_, max_i_neg) = channels.get_max_i_neg(channel);
         PwmLimits {
             max_v: max_v.get::<volt>(),
             max_i_pos: max_i_pos.get::<ampere>(),