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#ifndef __I2C_H

#define __I2C_H

extern volatile u32 I2C1_Timeout;

// I2C states

#define I2C_STATE_UNDEF                 0

#define I2C_STATE_IDLE                  1

#define I2C_STATE_TX_PENDING    2

#define I2C_STATE_TX_PROGRESS   3

#define I2C_STATE_RX_PENDING    4

#define I2C_STATE_RX_PROGRESS   5

#define I2C_STATE_OFF                   6

// current I2C state

extern volatile u8 I2C_State;

#define I2C1_TIMEOUT 500 // 500 ms

// define the sizte of the rx and tx buffer

#define I2C_TXBUFFER_LEN 50

#define I2C_RXBUFFER_LEN 50

// transfer buffer should be filled before start of transmission only when I2C_State is I2C_STATE_IDLE

extern volatile u8 I2C_TxBufferSize;

extern volatile u8 I2C_TxBuffer[];

void I2C1_Init(void);

void I2C1_Deinit(void);

// the pointer to the rxbuffer handler function

// called by the IRQ routine after all bytes are recieved from slave

typedef void (*I2C_pRxHandler_t) (u8* pRxBuffer, u8 RxBufferSize);

// initiate i2c transmission

// first all bytes from TxBuffer are send to slave

// and then all bytes are read from slave and the RxHandler function is called

// returns 1 if a transmission was started, otherwise 0

u8 I2C_Transmission(u8 SlaveAddr, I2C_pRxHandler_t pRxHandler, u8 RxBytes);

#endif // I2C_H