src/lib/Baro/baro_bmp280.h

   1 #pragma once
   2
   3 #include "baro_base.h"
   4 #include "baro_bmp280_regs.h"
   5
   6 class BMP280 : public BaroI2CBase
   7 {
   8 public:
   9     BMP280() : BaroI2CBase(), m_calib{0} {}
  10
  11     // Detect if chip is present
  12     static bool detect();
  13
  14     // BaroBase methods
  15     void initialize();
  16     uint8_t getTemperatureDuration();
  17     void startTemperature();
  18     int32_t getTemperature();
  19     // Temperature and Pressure are measured at the same time
  20     uint8_t getPressureDuration() { return 0; }
  21     void startPressure() {}
  22     uint32_t getPressure();
  23
  24 protected:
  25     // Filter 4: 1x=1.2PaRMS 2x=1.0PaRMS 4x=0.8PaRMS 8x=0.6PaRMS 16x=0.5PaRMS
  26     // Filter 8: 1x=0.9PaRMS 2x=0.6PaRMS 4x=0.5PaRMS 8x=0.4PaRMS 16x=0.4PaRMS
  27     // 16x pressure 1x Temp = 40.925ms
  28     // 8x pressure 1x Temp = 22.525ms
  29     static const uint8_t FILTER_COEFF = BMP280_FILTER_COEFF_8; // 8 in iNav
  30     static const uint8_t OVERSAMPLING_PRESSURE = BMP280_OVERSAMP_8X; // 8x in iNav
  31     static const uint8_t OVERSAMPLING_TEMPERATURE = BMP280_OVERSAMP_1X; // 1x in iNav
  32     static const uint8_t FREERUNNING_NUM_SAMPLES = 4; // Report after this number of samples complete
  33
  34     // calibration data, if initialized
  35     // Packed to be able to read all at once
  36     struct tagCalibrationData
  37     {
  38         uint16_t dig_T1;
  39         int16_t dig_T2;
  40         int16_t dig_T3;
  41         uint16_t dig_P1;
  42         int16_t dig_P2;
  43         int16_t dig_P3;
  44         int16_t dig_P4;
  45         int16_t dig_P5;
  46         int16_t dig_P6;
  47         int16_t dig_P7;
  48         int16_t dig_P8;
  49         int16_t dig_P9;
  50     } __attribute__((packed)) m_calib;
  51
  52     uint32_t m_pressureLast;
  53 };