Add function to retrieve barometric pressure

Introduced getBaroPressure() to obtain pressure in hPa from the BMP sensor. Updated header and implementation files to support pressure readings alongside temperature.

Author: zjwhitehead

inc/sp140/altimeter.h

@@ -22,7 +22,10 @@ float getVerticalSpeed();
 // Set the ground altitude to the current altitude to compute AGL
 void setGroundAltitude(const STR_DEVICE_DATA_140_V1& deviceData);
 
-// Get the temperature in degrees Celsius
-float getBaroTemperature();
-
-#endif  // INC_SP140_ALTIMETER_H_
+// Get the temperature in degrees Celsius
+float getBaroTemperature();
+
+// Get the pressure in hPa
+float getBaroPressure();
+
+#endif  // INC_SP140_ALTIMETER_H_

src/sp140/altimeter.cpp

@@ -7,12 +7,12 @@ Adafruit_BMP3XX bmp;
 bool bmpPresent = false;
 float groundAltitude = 0;
 
-// Buffer to store altitude readings with timestamps
 struct AltitudeReading {
   float altitude;
   unsigned long timestamp;
 };
 
+// Buffer to store altitude readings with timestamps
 CircularBuffer<AltitudeReading, VARIO_BUFFER_SIZE> altitudeBuffer;
 
 float getAltitude(const STR_DEVICE_DATA_140_V1& deviceData) {
@@ -67,6 +67,14 @@ float getBaroTemperature() {
   return __FLT_MIN__;  // Return a very small number if BMP is not present
 }
 
+// Get the pressure in hPa
+float getBaroPressure() {
+  if (bmpPresent) {
+    return bmp.readPressure() / 100.0f;  // Convert Pa to hPa
+  }
+  return __FLT_MIN__;  // Return a very small number if BMP is not present
+}
+
 // Start the bmp3XX sensor
 bool setupAltimeter(bool altWire) {
   TwoWire* wire = &Wire;