userspace/bmp085.h

   1 #include <sys/types.h>
   2
   3 #ifndef BMP085_H
   4 #define BMP085_H
   5
   6 #define BMP085_I2C_ADDRESS              0x77
   7
   8 #define BMP085_CALIBRATION_DATA_START   0xAA
   9 #define BMP085_CALIBRATION_DATA_LENGTH  22
  10
  11 #define BMP085_CHIP_ID_REG              0xD0
  12 #define BMP085_VERSION_REG              0xD1
  13
  14 #define BMP085_CHIP_ID                  0x55 /* 85 */
  15
  16
  17 typedef int16_t s16;
  18 typedef u_int16_t u16;
  19 typedef int32_t s32;
  20 typedef u_int8_t u8;
  21
  22
  23 struct bmp085_calibration_data {
  24         s16 AC1, AC2, AC3;
  25         u16 AC4, AC5, AC6;
  26         s16 B1, B2;
  27         s16 MB, MC, MD;
  28 };
  29
  30
  31 /* Each client has this additional data */
  32 struct bmp085_data {
  33         int client;
  34         unsigned char version;
  35         struct bmp085_calibration_data calibration;
  36         unsigned long raw_temperature;
  37         unsigned long raw_pressure;
  38         unsigned char oversampling_setting;
  39         unsigned long next_temp_measurement;
  40         long b6; // calculated temperature correction coefficient
  41 };
  42
  43 int open_bmp085(int adapter_nr, struct bmp085_data *data);
  44 void close_bmp085(struct bmp085_data *data);
  45 void set_oversampling(struct bmp085_data *data, unsigned char oversampling);
  46 unsigned char get_oversampling(struct bmp085_data *data);
  47 s32 get_temperature(struct bmp085_data *data);
  48 s32 get_pressure(struct bmp085_data *data);
  49
  50
  51 #endif