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#ifndef __I2C_H
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#ifndef __I2C_H
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#define __I2C_H
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#define __I2C_H
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#define I2C_CMD_VERSION                 0x01
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#define I2C_CMD_READ_MAG        0x02
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#define I2C_CMD_READ_HEADING    0x03
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#define I2C_CMD_WRITE_CAL       0x04
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typedef struct
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{
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  u8 Major;
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  u8 Minor;
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  u8 Patch;
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  u8 Compatible;
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} __attribute__((packed)) I2C_Version_t;
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typedef struct
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{
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  s16 MagX;
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  s16 MagY;
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  s16 MagZ;
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} __attribute__((packed)) I2C_Mag_t;
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typedef struct
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{
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  s16 Nick;
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  s16 Roll;
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} __attribute__((packed)) I2C_WriteAttitude_t;
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typedef struct
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{
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  u8 CalByte;
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  u8 Dummy1;
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  u8 Dummy2;
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} __attribute__((packed)) I2C_Cal_t;
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typedef struct
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{
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  s16 Heading;
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} __attribute__((packed)) I2C_Heading_t;
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extern volatile u32 I2C1_Timeout;
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// I2C states
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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_TX_PENDING    2
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#define I2C_STATE_TX_PROGRESS   3
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#define I2C_STATE_RX_PENDING    4
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#define I2C_STATE_RX_PROGRESS   5
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#define I2C_STATE_OFF                   6
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extern volatile u32 I2C1_Timeout;
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// current 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 the sizte of the rx and tx buffer
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#define I2C_TXBUFFER_LEN 50
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#define I2C_RXBUFFER_LEN 50
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extern volatile I2C_Heading_t           I2C_Heading;
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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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extern volatile I2C_Mag_t                       I2C_Mag;
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extern volatile u8 I2C_TxBufferSize;
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extern volatile u8 I2C_TxBuffer[];
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extern volatile I2C_Version_t           MK3MAG_Version;
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void I2C1_Init(void);
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void I2C1_Deinit(void);
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void I2C1_Init(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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// initiate i2c transmission
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// first all bytes from TxBuffer are send to slave
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void I2C1_SendCommand(u8 command);
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// and then all bytes are read from slave and the RxHandler function is called