Posts made by Sergey

I, too, stops on the line nfc.begin(); if disconnect board or select another pin - Didn't find PN53x board. Connect to I2C. SPI don`t work too.

hardware\arduino\avr\libraries\Wire\utility\twi.c

uint8_t **twi_writeTo**(uint8_t address, uint8_t* data, uint8_t length, uint8_t wait, uint8_t sendStop)
{
 . . . . . . . . . . . . . . . . . . . 
  // wait for write operation to complete
  while(wait && (TWI_MTX == twi_state)){
    continue; //**stops here**
  }
  
  if (twi_error == 0xFF)
    return 0;	// success
  else if (twi_error == TW_MT_SLA_NACK)
    return 2;	// error: address send, nack received
  else if (twi_error == TW_MT_DATA_NACK)
    return 3;	// error: data send, nack received
  else
    return 4;	// other twi error
}