Add support for CW2015 LiPo battery fuel gauge (#9564)

* Add support for CW2015 LiPo battery fuel gauge

* Address Copilot's concerns, minor fixups

src/Power.cpp

@@ -692,7 +692,9 @@ bool Power::setup()
     bool found = false;
     if (axpChipInit()) {
         found = true;
-    } else if (lipoInit()) {
+    } else if (cw2015Init()) {
+        found = true;
+    } else if (max17048Init()) {
         found = true;
     } else if (lipoChargerInit()) {
         found = true;
@@ -1321,7 +1323,7 @@ bool Power::axpChipInit()
 /**
  * Wrapper class for an I2C MAX17048 Lipo battery sensor.
  */
-class LipoBatteryLevel : public HasBatteryLevel
+class MAX17048BatteryLevel : public HasBatteryLevel
 {
   private:
     MAX17048Singleton *max17048 = nullptr;
@@ -1369,18 +1371,18 @@ class LipoBatteryLevel : public HasBatteryLevel
     virtual bool isCharging() override { return max17048->isBatteryCharging(); }
 };
 
-LipoBatteryLevel lipoLevel;
+MAX17048BatteryLevel max17048Level;
 
 /**
  * Init the Lipo battery level sensor
  */
-bool Power::lipoInit()
+bool Power::max17048Init()
 {
-    bool result = lipoLevel.runOnce();
-    LOG_DEBUG("Power::lipoInit lipo sensor is %s", result ? "ready" : "not ready yet");
+    bool result = max17048Level.runOnce();
+    LOG_DEBUG("Power::max17048Init lipo sensor is %s", result ? "ready" : "not ready yet");
     if (!result)
         return false;
-    batteryLevel = &lipoLevel;
+    batteryLevel = &max17048Level;
     return true;
 }
 
@@ -1388,7 +1390,88 @@ bool Power::lipoInit()
 /**
  * The Lipo battery level sensor is unavailable - default to AnalogBatteryLevel
  */
-bool Power::lipoInit()
+bool Power::max17048Init()
+{
+    return false;
+}
+#endif
+
+#if !MESHTASTIC_EXCLUDE_I2C && HAS_CW2015
+
+class CW2015BatteryLevel : public AnalogBatteryLevel
+{
+  public:
+    /**
+     * Battery state of charge, from 0 to 100 or -1 for unknown
+     */
+    virtual int getBatteryPercent() override
+    {
+        int data = -1;
+        Wire.beginTransmission(CW2015_ADDR);
+        Wire.write(0x04);
+        if (Wire.endTransmission() == 0) {
+            if (Wire.requestFrom(CW2015_ADDR, (uint8_t)1)) {
+                data = Wire.read();
+            }
+        }
+        return data;
+    }
+
+    /**
+     * The raw voltage of the battery in millivolts, or NAN if unknown
+     */
+    virtual uint16_t getBattVoltage() override
+    {
+        uint16_t mv = 0;
+        Wire.beginTransmission(CW2015_ADDR);
+        Wire.write(0x02);
+        if (Wire.endTransmission() == 0) {
+            if (Wire.requestFrom(CW2015_ADDR, (uint8_t)2)) {
+                mv = Wire.read();
+                mv <<= 8;
+                mv |= Wire.read();
+                // Voltage is read in  305uV units, convert to mV
+                mv = mv * 305 / 1000;
+            }
+        }
+        return mv;
+    }
+};
+
+CW2015BatteryLevel cw2015Level;
+
+/**
+ * Init the CW2015 battery level sensor
+ */
+bool Power::cw2015Init()
+{
+
+    Wire.beginTransmission(CW2015_ADDR);
+    uint8_t getInfo[] = {0x0a, 0x00};
+    Wire.write(getInfo, 2);
+    Wire.endTransmission();
+    delay(10);
+    Wire.beginTransmission(CW2015_ADDR);
+    Wire.write(0x00);
+    bool result = false;
+    if (Wire.endTransmission() == 0) {
+        if (Wire.requestFrom(CW2015_ADDR, (uint8_t)1)) {
+            uint8_t data = Wire.read();
+            LOG_DEBUG("CW2015 init read data: 0x%x", data);
+            if (data == 0x73) {
+                result = true;
+                batteryLevel = &cw2015Level;
+            }
+        }
+    }
+    return result;
+}
+
+#else
+/**
+ * The CW2015 battery level sensor is unavailable - default to AnalogBatteryLevel
+ */
+bool Power::cw2015Init()
 {
     return false;
 }

src/configuration.h

@@ -233,6 +233,7 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #define NAU7802_ADDR 0x2A
 #define MAX30102_ADDR 0x57
 #define SCD4X_ADDR 0x62
+#define CW2015_ADDR 0x62
 #define MLX90614_ADDR_DEF 0x5A
 #define CGRADSENS_ADDR 0x66
 #define LTR390UV_ADDR 0x53

src/detect/ScanI2C.h

@@ -88,7 +88,8 @@ class ScanI2C
         BH1750,
         DA217,
         CHSC6X,
-        CST226SE
+        CST226SE,
+        CW2015
     } DeviceType;
 
     // typedef uint8_t DeviceAddress;

src/detect/ScanI2CTwoWire.cpp

@@ -541,7 +541,17 @@ void ScanI2CTwoWire::scanPort(I2CPort port, uint8_t *address, uint8_t asize)
                 break;
 
                 SCAN_SIMPLE_CASE(BHI260AP_ADDR, BHI260AP, "BHI260AP", (uint8_t)addr.address);
-                SCAN_SIMPLE_CASE(SCD4X_ADDR, SCD4X, "SCD4X", (uint8_t)addr.address);
+            case SCD4X_ADDR: {
+                registerValue = getRegisterValue(ScanI2CTwoWire::RegisterLocation(addr, 0x8), 1);
+                if (registerValue == 0x18) {
+                    logFoundDevice("CW2015", (uint8_t)addr.address);
+                    type = CW2015;
+                } else {
+                    logFoundDevice("SCD4X", (uint8_t)addr.address);
+                    type = SCD4X;
+                }
+                break;
+            }
                 SCAN_SIMPLE_CASE(BMM150_ADDR, BMM150, "BMM150", (uint8_t)addr.address);
 #ifdef HAS_TPS65233
                 SCAN_SIMPLE_CASE(TPS65233_ADDR, TPS65233, "TPS65233", (uint8_t)addr.address);

src/power.h

@@ -103,8 +103,10 @@ class Power : private concurrency::OSThread
     bool axpChipInit();
     /// Setup a simple ADC input based battery sensor
     bool analogInit();
-    /// Setup a Lipo battery level sensor
-    bool lipoInit();
+    /// Setup cw2015 battery level sensor
+    bool cw2015Init();
+    /// Setup a 17048 battery level sensor
+    bool max17048Init();
     /// Setup a Lipo charger
     bool lipoChargerInit();
     /// Setup a meshSolar battery sensor