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struct i2c_type
{
    unsigned char address;
    unsigned char pointer;
    unsigned short data;
};
 
struct i2c_mode
{
    unsigned char read_write;
    unsigned char byte_word;
    unsigned char ptr_set;
};
 
typedef struct i2c_type i2c_type;
typedef struct i2c_mode i2c_mode;
 
#define I2C_BUF_LEN     10
 
void i2c_init(void);
void i2c_irq(void);
 
i2c_type * i2c_get(void);                           //return pointer to first non read received data
 
void i2c_set_ack_lvl(int ack_lvl, int final_ack_lvl);
int i2c_trans(i2c_mode * mode, i2c_type * data);   //return (-1) or length (still processing previous) or asserted
 
#define I2C_PRESC_LO     0x00
#define I2C_PRESC_HI     0x01
 
#define I2C_CTR          0x02
 
#define I2C_TXR          0x03
#define I2C_RXR          0x03
 
#define I2C_CR           0x04
#define I2C_SR           0x04
 
 
//BITS
#define I2C_CTR_EN        0x80
#define I2C_CTR_IRQ_EN    0x40
 
#define I2C_TXR_ADR      0xFE
#define I2C_TXR_W        0x00
#define I2C_TXR_R        0x01
 
#define I2C_CR_STA       0x80
#define I2C_CR_STO       0x40
#define I2C_CR_RD        0x20
#define I2C_CR_WR        0x10
#define I2C_CR_ACK       0x00
#define I2C_CR_NACK      0x08
#define I2C_CR_CLR_IRQ   0x01
 
#define I2C_SR_R_ACK     0x80
#define I2C_SR_BUSY      0x40
#define I2C_SR_ARB_LOST  0x20
#define I2C_SR_TX_BUSY   0x02
#define I2C_SR_IRQ_FLAG  0x01