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extern volatile u32 I2C1_Timeout;
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extern volatile u32 I2C1_Timeout;
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// I2C states
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// I2C states
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#define I2C_STATE_UNDEF                 0
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#define I2C_STATE_UNDEF                 0
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#define I2C_STATE_IDLE                  1
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#define I2C_STATE_IDLE                  1
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#define I2C_STATE_BUFFBUSY              2
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#define I2C_STATE_TX_PENDING    2
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#define I2C_STATE_TX_PENDING    3
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#define I2C_STATE_TX_PROGRESS   3
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#define I2C_STATE_TX_PROGRESS   4
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#define I2C_STATE_RX_PENDING    4
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#define I2C_STATE_RX_PENDING    5
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#define I2C_STATE_RX_PROGRESS   5
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#define I2C_STATE_RX_PROGRESS   6
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#define I2C_STATE_OFF                   6
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#define I2C_STATE_OFF                   7
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// current I2C state
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// current I2C state
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extern volatile u8 I2C_State;
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extern volatile u8 I2C_State;
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#define I2C1_TIMEOUT 500 // 500 ms
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#define I2C1_TIMEOUT 500 // 500 ms
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// define the sizte of the rx and tx buffer
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// define the size of the rx/tx buffer
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#define I2C_TXBUFFER_LEN 50
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#define I2C_BUFFER_LEN 150
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#define I2C_RXBUFFER_LEN 50
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// transfer buffer should be filled after a successful
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// transfer buffer should be filled before start of transmission only when I2C_State is I2C_STATE_IDLE
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// I2C_LockBuffer(...) and before a start of transmission
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extern volatile u8 I2C_TxBufferSize;
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// initiated by  I2C_Transmission(...).
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extern volatile u8 I2C_TxBuffer[];
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extern volatile u8 I2C_Buffer[];
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void I2C1_Init(void);
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void I2C1_Init(void);
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void I2C1_Deinit(void);
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void I2C1_Deinit(void);
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// the pointer to the rxbuffer handler function
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// called by the IRQ routine after all bytes are recieved from slave
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typedef void (*I2C_pRxHandler_t) (u8* pRxBuffer, u8 RxBufferSize);
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// the pointer to the rxbuffer handler function
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// Initiate i2c transmission
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// A transmission sends first TxBytes from I2C_Buffer to slave
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// and then RxBytes are read from slave to I2C_Buffer
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// replacing the byte that have been sent.
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// Then the RxHandler function is called to handle the result.
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// This function returns imediatly after a start condition.
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// returns 1 if a transmission has been started, otherwise 0
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// called by the IRQ routine after all bytes are recieved from slave
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u8 I2C_Transmission(u8 SlaveAddr, u8 TxBytes, I2C_pRxHandler_t pRxHandler, u8 RxBytes);