Only use LERP baro altitude on esp82xx

Author: CapnBry

src/lib/Baro/baro_base.cpp

@@ -9,20 +9,18 @@ uint8_t BaroI2CBase::m_address = 0;
 /**
  * @brief: Return altitude in cm from pressure in deci-Pascals
  **/
-// int32_t BaroBase::pressureToAltitude(uint32_t pressuredPa)
-// {
-//     const float seaLeveldPa = 1013250; // 1013.25hPa
-//     return 4433000 * (1.0 - pow(pressuredPa / seaLeveldPa, 0.1903));
-// }
-
-int32_t BaroBase::pressureToAltitude(uint32_t pressurePa)
+int32_t BaroBase::pressureToAltitude(uint32_t pressuredPa)
 {
+#if defined(PLATFORM_ESP32)
+     const float seaLeveldPa = 1013250; // 1013.25hPa
+     return 4433000 * (1.0 - pow(pressuredPa / seaLeveldPa, 0.1903));
+#else // ESP8266
     const size_t LUT_CNT = 6;
     const int32_t pressureTable[LUT_CNT] = { 1013250, 898750, 794950, 701080, 616400, 540200 };
     const int32_t altitudeTable[LUT_CNT] = { 0, 100000, 200000, 300000, 400000, 500000 };
 
     unsigned i = 0;
-    while (i < LUT_CNT-2 && (int32_t)pressurePa < pressureTable[i + 1])
+    while (i < LUT_CNT-2 && (int32_t)pressuredPa < pressureTable[i + 1])
         i++;
 
     // Linear interpolation, note that >5000m the error grows exponentially
@@ -31,7 +29,8 @@ int32_t BaroBase::pressureToAltitude(uint32_t pressurePa)
     int32_t a0 = altitudeTable[i];
     int32_t a1 = altitudeTable[i + 1];
 
-    return map(pressurePa, p0, p1, a0, a1);
+    return map(pressuredPa, p0, p1, a0, a1);
+#endif
 }
 
 void BaroI2CBase::readRegister(uint8_t reg, uint8_t *data, size_t size)

src/lib/Baro/baro_base.h

@@ -28,7 +28,7 @@ class BaroBase
 
     // Base functions
     bool isInitialized() const { return m_initialized; }
-    int32_t pressureToAltitude(uint32_t pressurePa);
+    int32_t pressureToAltitude(uint32_t pressuredPa);
     // Properties
     int32_t getAltitudeHome() const { return m_altitudeHome; }
     void setAltitudeHome(int32_t altitudeHome) { m_altitudeHome = altitudeHome; }