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bme280.h
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bme280.h
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#ifndef BME280_H
#define BME280_H
#include <stdint.h>
#include <stdbool.h>
#include <linux/types.h>
#include <linux/i2c-dev.h>
#include <linux/spi/spidev.h>
typedef struct {
int fd;
int is_spi;
int speed_hz;
int delay_usecs;
int bits;
int dig_temp[3];
int dig_press[9];
int dig_hum[6];
uint32_t raw_temp;
uint32_t raw_press;
uint32_t raw_hum;
double temp_fine;
} bme280_t;
bool bme280_i2c_open(bme280_t *bme280, int bus);
bool bme280_i2c_setup(bme280_t *bme280, int slave);
bool bme280_spi_open(bme280_t *bme280, int bus, int chip_select);
bool bme280_spi_setup(bme280_t *bme280, int mode, int bits, int speed, int delay);
void bme280_close(bme280_t *bme280);
void bme280_write_config(bme280_t *bme280, uint8_t osrs_t, uint8_t osrs_p, uint8_t osrs_h, uint8_t mode, uint8_t t_sb, uint8_t filter, uint8_t spi3w_en);
void bme280_read_raw_temp(bme280_t *bme280);
void bme280_read_raw_press(bme280_t *bme280);
void bme280_read_raw_hum(bme280_t *bme280);
void bme280_read_calib(bme280_t *bme280);
double bme280_get_compensate_temp(bme280_t *bme280);
double bme280_get_compensate_press(bme280_t *bme280);
double bme280_get_compensate_hum(bme280_t *bme280);
void bme280_dump(bme280_t *bme280);
#define DEFAULT_I2C_SLAVE 0x76
#define DEFAULT_SPI_MODE SPI_MODE_0
#define DEFAULT_SPI_BITS 8
#define DEFAULT_SPI_SPEED 500000
#define DEFAULT_SPI_DELAY 0
#define OSRS_SKIPPED 0b000 // Skipped (output set to 0x80000)
#define OSRS_X1 0b001 // oversampling 1
#define OSRS_X2 0b010 // oversampling 2
#define OSRS_X4 0b011 // oversampling 4
#define OSRS_X8 0b100 // oversampling 8
#define OSRS_X16 0b101 // oversampling 16
#define MODE_SLEEP 0b00 // Sleep mode
#define MODE_FORCED 0b01 // Forced mode
#define MODE_NORMAL 0b11 // Normal mode
#define SB_0_5 0b000 // 0.5ms
#define SB_62_5 0b001 // 62.5ms
#define SB_125 0b010 // 125ms
#define SB_250 0b011 // 250ms
#define SB_500 0b100 // 500ms
#define SB_1000 0b101 // 1000ms
#define SB_10 0b110 // 10ms
#define SB_20 0b111 // 20ms
#define FILTER_OFF 0b000 // Filter off
#define FILTER_2 0b001 // 2
#define FILTER_4 0b010 // 4
#define FILTER_8 0b011 // 8
#define FILTER_16 0b100 // 16
#endif /* BME280_H */