OV7670 camera module

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help please!!!
i have ist assignment
and error

static uint8_t twird(uint8_t nack){
  if (nack){
    twcr=_bv(twint) | _bv(twen);
    while ((twcr & _bv(twint)) == 0); /* wait transmission */
  if ((twsr & 0xf8) != tw_mr_data_nack)
    error_led();
    return twdr;
  }else{
    twcr=_bv(twint) | _bv(twen) | _bv(twea);
    while ((twcr & _bv(twint)) == 0) ; /* wait transmission */
    if ((twsr & 0xf8) != tw_mr_data_ack)
      error_led();
    return twdr;
  }
}

you have no setup(), no loop(), no code tags.


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