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#define I2C_STATE_TX_PROGRESS   4
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#define I2C_STATE_TX_PROGRESS   4
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#define I2C_STATE_RX_PENDING    5
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#define I2C_STATE_RX_PENDING    5
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#define I2C_STATE_RX_PROGRESS   6
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#define I2C_STATE_RX_PROGRESS   6
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#define I2C_STATE_OFF                   7
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#define I2C_STATE_OFF                   7
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#define I2C_ERROR_NONE                  0
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#define I2C_ERROR_UNKNOWN               1
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#define I2C_ERROR_NOACK                 2
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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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// the last I2C error
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extern volatile u8 I2C_State;
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extern volatile u8 I2C_Error;
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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 size of the rx/tx buffer
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// define the size of the rx/tx buffer
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#define I2C_BUFFER_LEN 150
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#define I2C_BUFFER_LEN 100
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// transfer buffer should be filled after a successful
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// transfer buffer should be filled after a successful