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  // initialize state
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  // initialize state
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  twi_state = TWI_READY;
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  twi_state = TWI_READY;
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  twi_sendStop = true;		// default value
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  twi_sendStop = true;		// default value
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  twi_inRepStart = false;
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  twi_inRepStart = false;
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  // activate internal pullups for twi.
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  // activate internal pullups for twi
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  // @TODO: activate pullups
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  // @TODO: activate pullups (If not provided externally)
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  //digitalWrite(SDA, 1);
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  //digitalWrite(SDA, 1);
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  //digitalWrite(SCL, 1);
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  //digitalWrite(SCL, 1);
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  // initialize twi prescaler and bit rate
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  // initialize twi prescaler and bit rate
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  cbi(TWSR, TWPS0);
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  cbi(TWSR, TWPS0);