livedata: show Nernst voltage

firmware/livedata.cpp

@@ -26,6 +26,7 @@ void SamplingUpdateLiveData()
         data->temperature = GetSensorTemperature(ch) * 10;
         data->heaterSupplyVoltage = voltage * 100;
         data->nernstDc = GetNernstDc(ch) * 1000;
+        data->nernstV = (int16_t)(GetNernstV(ch) * 1000.0);
         data->nernstAc = GetNernstAc(ch) * 1000;
         data->pumpCurrentTarget = GetPumpCurrent(ch);
         data->pumpCurrentMeasured = GetPumpNominalCurrent(ch);

firmware/livedata.h

@@ -30,7 +30,8 @@ struct livedata_afr_s {
 			float pumpCurrentMeasured;
 			uint16_t heaterDuty;
 			uint16_t heaterEffectiveVoltage;
-			float esr;
+			uint16_t esr;
+			int16_t nernstV;
 			uint8_t fault; // See wbo::Fault
 			uint8_t heaterState;
 		} __attribute__((packed));

firmware/sampling.cpp

@@ -15,6 +15,7 @@
 struct measure_results {
     float nernstAc;
     float nernstDc;
+    float nernstV;
     float pumpCurrentSenseVoltage;
     float internalBatteryVoltage;
     int clamped;
@@ -80,6 +81,7 @@ static void SamplingThread(void*)
             // Compute AC (difference) and DC (average) components
             float nernstAcLocal = f_abs(r2_opposite_phase - r_2[ch]);
             res.nernstDc = (r2_opposite_phase + r_2[ch]) / 2;
+            res.nernstV = result.ch[ch].NernstVoltage;
 
             res.nernstAc =
                 (1 - ESR_SENSE_ALPHA) * res.nernstAc +
@@ -160,6 +162,11 @@ float GetNernstDc(int ch)
     return results[ch].nernstDc;
 }
 
+float GetNernstV(int ch)
+{
+    return results[ch].nernstV;
+}
+
 float GetPumpNominalCurrent(int ch)
 {
     // Gain is 10x, then a 61.9 ohm resistor

firmware/sampling.h

@@ -6,5 +6,6 @@ float GetNernstAc(int ch);
 float GetSensorInternalResistance(int ch);
 float GetSensorTemperature(int ch);
 float GetNernstDc(int ch);
+float GetNernstV(int ch);
 float GetPumpNominalCurrent(int ch);
 float GetInternalBatteryVoltage(int ch);