bmp280.h

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#pragma once

#define BMP280_ADDR_CAL     0x88    /* address of 12x 2 bytes calibration data */
#define BMP280_ADDR_DATA    0xF7    /* address of 2x 3 bytes p-t data */

#define BMP280_ADDR_CONFIG  0xF5    /* configuration */
#define BMP280_ADDR_CTRL    0xF4    /* controll */
#define BMP280_ADDR_STATUS  0xF3    /* state */
#define BMP280_ADDR_RESET   0xE0    /* reset */
#define BMP280_ADDR_ID      0xD0    /* id */

#define BMP280_VALUE_ID     0x58    /* chip id */
#define BMP280_VALUE_RESET  0xB6    /* reset */

#define BMP280_STATUS_MEASURING (1<<3)  /* if in process of measure */
#define BMP280_STATUS_COPING    (1<<0)  /* if in process of data copy */

#define BMP280_CTRL_P0      (0x0<<2)        /* no p measure */
#define BMP280_CTRL_P1      (0x1<<2)
#define BMP280_CTRL_P2      (0x2<<2)
#define BMP280_CTRL_P4      (0x3<<2)
#define BMP280_CTRL_P8      (0x4<<2)
#define BMP280_CTRL_P16     (0x5<<2)

#define BMP280_CTRL_T0      (0x0<<5)        /* no t measure */
#define BMP280_CTRL_T1      (0x1<<5)
#define BMP280_CTRL_T2      (0x2<<5)
#define BMP280_CTRL_T4      (0x3<<5)
#define BMP280_CTRL_T8      (0x4<<5)
#define BMP280_CTRL_T16     (0x5<<5)

#define BMP280_CONFIG_F0        (0x0<<2)        /* no filter */
#define BMP280_CONFIG_F2        (0x1<<2)
#define BMP280_CONFIG_F4        (0x2<<2)
#define BMP280_CONFIG_F8        (0x3<<2)
#define BMP280_CONFIG_F16       (0x4<<2)


#define BMP280_CTRL_MODE_SLEEP  0x0
#define BMP280_CTRL_MODE_FORCE  0x1     /* on demand, goes to sleep after */
#define BMP280_CTRL_MODE_NORMAL 0x3

#define BMP280_MT_INIT      6400    /* max measure time of initial p + t in us */
#define BMP280_MT           2300    /* max measure time of p or t in us */

namespace bmp280
{

#pragma pack(push,1)
struct calibration_s {
    uint16_t t1;
    int16_t t2;
    int16_t t3;

    uint16_t p1;
    int16_t p2;
    int16_t p3;
    int16_t p4;
    int16_t p5;
    int16_t p6;
    int16_t p7;
    int16_t p8;
    int16_t p9;
}; //calibration data

struct data_s {
    uint8_t p_msb;
    uint8_t p_lsb;
    uint8_t p_xlsb;

    uint8_t t_msb;
    uint8_t t_lsb;
    uint8_t t_xlsb;
}; // data
#pragma pack(pop)

struct fcalibration_s {
    float t1;
    float t2;
    float t3;

    float p1;
    float p2;
    float p3;
    float p4;
    float p5;
    float p6;
    float p7;
    float p8;
    float p9;
};

class IBMP280
{
public:
    virtual ~IBMP280() = default;

    virtual bool is_external() = 0;
    virtual int init() = 0;

    // read reg value
    virtual uint8_t get_reg(uint8_t addr) = 0;

    // write reg value
    virtual int set_reg(uint8_t value, uint8_t addr) = 0;

    // bulk read of data into buffer, return same pointer
    virtual bmp280::data_s *get_data(uint8_t addr) = 0;

    // bulk read of calibration data into buffer, return same pointer
    virtual bmp280::calibration_s *get_calibration(uint8_t addr) = 0;

};

} /* namespace */


/* interface factories */
extern bmp280::IBMP280 *bmp280_spi_interface(uint8_t busnum, uint32_t device, bool external);
extern bmp280::IBMP280 *bmp280_i2c_interface(uint8_t busnum, uint32_t device, bool external);
typedef bmp280::IBMP280 *(*BMP280_constructor)(uint8_t, uint32_t, bool);