i2c.h

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#ifndef _I2C_HXX_
#define _I2C_HXX_
 
#if defined (__linux__)
    #include <linux/i2c.h>
#elif defined (__FreeRTOS__) || defined(ESP_PLATFORM)
    #include <stdint.h>
    struct i2c_msg
    {
        uint16_t addr; 
        uint16_t flags; 
            #define I2C_M_RD 0x0001 
        uint16_t len; 
        uint8_t *buf; 
    };
 
    #define I2C_SMBUS_BLOCK_MAX 32  /* As specified in SMBus standard */
 
    union i2c_smbus_data {
        uint8_t byte;
        uint16_t word;
        uint8_t block[I2C_SMBUS_BLOCK_MAX + 2]; /* block[0] is used for length */
                       /* and one more for user-space compatibility */
    };
 
/* i2c_smbus_xfer read or write markers */
#define I2C_SMBUS_READ  1
#define I2C_SMBUS_WRITE 0
 
/* SMBus transaction types (size parameter in the above functions)
   Note: these no longer correspond to the (arbitrary) PIIX4 internal codes! */
#define I2C_SMBUS_QUICK         0
#define I2C_SMBUS_BYTE          1
#define I2C_SMBUS_BYTE_DATA     2
#define I2C_SMBUS_WORD_DATA     3
#define I2C_SMBUS_PROC_CALL     4
#define I2C_SMBUS_BLOCK_DATA        5
#define I2C_SMBUS_I2C_BLOCK_BROKEN  6
#define I2C_SMBUS_BLOCK_PROC_CALL   7       /* SMBus 2.0 */
#define I2C_SMBUS_I2C_BLOCK_DATA    8
#else
    #error I2C drivers not supported on this OS
#endif
 
#endif /* _I2C_HXX_ */