INA3221 bugfixes & refinement (#2944)

Reorganized and refactored some INA3221 code
Added comments
Added missing shunt resistor value (100mΩ)
Added INA3221 Channel 1 to getINAVoltage() for device battery monitoring
	modified:   src/Power.cpp
	modified:   src/modules/Telemetry/PowerTelemetry.cpp
	modified:   src/modules/Telemetry/Sensor/INA3221Sensor.cpp
	modified:   src/modules/Telemetry/Sensor/INA3221Sensor.h
	modified:   src/power.h

src/modules/Telemetry/PowerTelemetry.cpp

@@ -11,11 +11,6 @@
 #include "sleep.h"
 #include "target_specific.h"
 
-#if HAS_TELEMETRY && !defined(ARCH_PORTDUINO)
-#include "Sensor/INA3221Sensor.h"
-INA3221Sensor ina3221Sensor;
-#endif
-
 #define FAILED_STATE_SENSOR_READ_MULTIPLIER 10
 #define DISPLAY_RECEIVEID_MEASUREMENTS_ON_SCREEN true
 

src/modules/Telemetry/Sensor/INA3221Sensor.cpp

@@ -13,8 +13,9 @@ int32_t INA3221Sensor::runOnce()
         return DEFAULT_SENSOR_MINIMUM_WAIT_TIME_BETWEEN_READS;
     }
     if (!status) {
-        ina3221.setAddr(INA3221_ADDR42_SDA);
+        ina3221.setAddr(INA3221_ADDR42_SDA); // i2c address 0x42
         ina3221.begin();
+        ina3221.setShuntRes(100, 100, 100); // 0.1 Ohm shunt resistors
         status = true;
     } else {
         status = true;

src/modules/Telemetry/Sensor/INA3221Sensor.h

@@ -1,16 +1,19 @@
 #include "../mesh/generated/meshtastic/telemetry.pb.h"
 #include "TelemetrySensor.h"
+#include "VoltageSensor.h"
 #include <INA3221.h>
 
-class INA3221Sensor : public TelemetrySensor
+class INA3221Sensor : public TelemetrySensor, VoltageSensor
 {
+  private:
+    INA3221 ina3221 = INA3221(INA3221_ADDR42_SDA);
+
+  protected:
+    void setup() override;
+
   public:
     INA3221Sensor();
     int32_t runOnce() override;
-    void setup() override;
     bool getMetrics(meshtastic_Telemetry *measurement) override;
-    virtual uint16_t getBusVoltageMv();
-
-  private:
-    INA3221 ina3221 = INA3221(INA3221_ADDR42_SDA);
+    virtual uint16_t getBusVoltageMv() override;
 };