bh1750.h

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#ifndef INC_SENSORS_INC_BH1750_H_
#define INC_SENSORS_INC_BH1750_H_
 
#include "stdint.h"
#include "stddef.h"

typedef int8_t (*BH1750_I2C_Read_Func)(uint8_t dev_addr, uint8_t reg_addr,
                                        uint8_t *data, uint16_t len);
typedef int8_t (*BH1750_I2C_Write_Func)(uint8_t dev_addr, uint8_t reg_addr,
                                         uint8_t *data, uint16_t len);
typedef void   (*BH1750_Delay_Func)(uint32_t ms);

typedef struct {
    BH1750_I2C_Read_Func  i2c_read;  
    BH1750_I2C_Write_Func i2c_write; 
    BH1750_Delay_Func     delay_ms;  
    uint8_t address; 
    uint8_t mode;    
    float   lux;     
} BH1750_HandleTypeDef;
 
/* ---------- Address constants ---------- */
#define BH1750_ADDRESS_GND  (0x23 << 1) 
#define BH1750_ADDRESS_VCC  (0x5C << 1) 
#define BH1750_ADDRESS       BH1750_ADDRESS_GND 
 
/* ---------- Measurement mode commands ---------- */
#define BH1750_CONTINIOUS_H_RES_MODE   0x10 
#define BH1750_CONTINIOUS_H_RES_MODE2  0x11 
#define BH1750_CONTINIOUS_L_RES_MODE   0x13 
#define BH1750_ONE_TIME_H_RES_MODE     0x20 
#define BH1750_ONE_TIME_H_RES_MODE2    0x21 
#define BH1750_ONE_TIME_L_RES_MODE     0x23 
 
/* ---------- Power / reset commands ---------- */
#define BH1750_PWR_DOWN  0x00 
#define BH1750_PWR_ON    0x01 
#define BH1750_RST       0x07 
 
/* ---------- Measurement timing (ms) ---------- */
#define MEASUREMENT_TIME_H_RES_MODE   120 
#define MEASUREMENT_TIME_H_RES_MODE2  120 
#define MEASUREMENT_TIME_L_RES_MODE    16 

#define BH1750_LUX_COEFF 1.2f

int8_t BH1750_Init(BH1750_HandleTypeDef *dev);

int8_t BH1750_Read(BH1750_HandleTypeDef *dev);
 
#endif /* INC_SENSORS_INC_BH1750_H_ */