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libraries/Adafruit_BMP183_Unified_Library/Adafruit_BMP183_U.h

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+/*!
+ * @file Adafruit_BMP183_U.h
+ *
+ * Designed specifically to work with the Adafruit BMP183 Breakout
+ * ----> http://www.adafruit.com/products/1900
+ *
+ * These sensors use SPI to communicate, 4 pins are required
+ * to interface.
+ *
+ * Adafruit invests time and resources providing this open source code,
+ * please support Adafruit and open-source hardware by purchasing
+ * products from Adafruit!
+ *
+ * Written by Kevin Townsend "KTOWN" for Adafruit Industries.
+ *
+ * BSD license, all text here must be included in any redistribution.
+ *
+ */
+#ifndef __BMP183_H__
+#define __BMP183_H__
+
+#include "Arduino.h"
+
+#include <Adafruit_Sensor.h>
+#include <SPI.h>
+
+/** Registers **/
+enum {
+  BMP183_REGISTER_CAL_AC1 = 0xAA, // R   Calibration data (16 bits)
+  BMP183_REGISTER_CAL_AC2 = 0xAC, // R   Calibration data (16 bits)
+  BMP183_REGISTER_CAL_AC3 = 0xAE, // R   Calibration data (16 bits)
+  BMP183_REGISTER_CAL_AC4 = 0xB0, // R   Calibration data (16 bits)
+  BMP183_REGISTER_CAL_AC5 = 0xB2, // R   Calibration data (16 bits)
+  BMP183_REGISTER_CAL_AC6 = 0xB4, // R   Calibration data (16 bits)
+  BMP183_REGISTER_CAL_B1 = 0xB6,  // R   Calibration data (16 bits)
+  BMP183_REGISTER_CAL_B2 = 0xB8,  // R   Calibration data (16 bits)
+  BMP183_REGISTER_CAL_MB = 0xBA,  // R   Calibration data (16 bits)
+  BMP183_REGISTER_CAL_MC = 0xBC,  // R   Calibration data (16 bits)
+  BMP183_REGISTER_CAL_MD = 0xBE,  // R   Calibration data (16 bits)
+  BMP183_REGISTER_CHIPID = 0xD0,
+  BMP183_REGISTER_VERSION = 0xD1,
+  BMP183_REGISTER_SOFTRESET = 0xE0,
+  BMP183_REGISTER_CONTROL = 0xF4,
+  BMP183_REGISTER_TEMPDATA = 0xF6,
+  BMP183_REGISTER_PRESSUREDATA = 0xF6,
+  BMP183_REGISTER_READTEMPCMD = 0x2E,
+  BMP183_REGISTER_READPRESSURECMD = 0x34
+};
+
+/** Mode Settings **/
+typedef enum {
+  BMP183_MODE_ULTRALOWPOWER = 0,
+  BMP183_MODE_STANDARD = 1,
+  BMP183_MODE_HIGHRES = 2,
+  BMP183_MODE_ULTRAHIGHRES = 3
+} bmp183_mode_t;
+
+/** Calibration Data **/
+typedef struct {
+  int16_t ac1;  /**< Calibration coefficient (ac1) **/
+  int16_t ac2;  /**< Calibration coefficient (ac2) **/
+  int16_t ac3;  /**< Calibration coefficient (ac3) **/
+  uint16_t ac4; /**< Calibration coefficient (ac4) **/
+  uint16_t ac5; /**< Calibration coefficient (ac5) **/
+  uint16_t ac6; /**< Calibration coefficient (ac6) **/
+  int16_t b1;   /**< Calibration coefficient (b1) **/
+  int16_t b2;   /**< Calibration coefficient (b2) **/
+  int16_t mb;   /**< Calibration coefficient (mb) **/
+  int16_t mc;   /**< Calibration coefficient (mc) **/
+  int16_t md;   /**< Calibration coefficient (md) **/
+} bmp183_calib_data;
+
+/*!
+ *  @brief  Class that stores state and functions for interacting with
+ *          BMP183
+ */
+class Adafruit_BMP183_Unified : public Adafruit_Sensor {
+public:
+  Adafruit_BMP183_Unified(int8_t SPICLK, int8_t SPIMISO, int8_t SPIMOSI,
+                          int8_t SPICS, int32_t sensorID = -1);
+  Adafruit_BMP183_Unified(int8_t SPICS, int32_t sensorID = -1,
+                          SPIClass *theSPI = &SPI);
+
+  bool begin(bmp183_mode_t mode = BMP183_MODE_ULTRAHIGHRES);
+  float getTemperature();
+  float getPressure();
+  float pressureToAltitude(float seaLevel, float atmospheric, float temp);
+  float seaLevelForAltitude(float altitude, float atmospheric, float temp);
+  bool getEvent(sensors_event_t *);
+  void getSensor(sensor_t *);
+
+private:
+  void readCoefficients(void);
+  int16_t readRawTemperature();
+  int32_t readRawPressure();
+
+  uint8_t read8(byte reg);
+  int16_t readS16(byte reg);
+  uint16_t read16(byte reg);
+  void writeCommand(byte reg, byte value);
+
+  uint8_t SPIxfer(uint8_t x);
+
+  int32_t _sensorID;
+  bmp183_calib_data _bmp183_coeffs;
+  uint8_t _bmp183Mode;
+
+  int8_t _cs, _clk, _miso, _mosi;
+};
+
+#endif