writeCommand method

void writeCommand(List<int> commands)

Implementation

void writeCommand(List<int> commands) {
  Uint8 commandLength = Uint8(commands.length);
  List<int> finalCommandsList = [];
  Uint8 checksum = Uint8.zero();

  // Adding all the necessary padding commands and add some of them to the
  // checksum (I actually don't really know why some of same aren't taken
  // into account when we calculate the checksum)
  finalCommandsList.add(pn532Preamble);
  checksum += Uint8(pn532Preamble);
  finalCommandsList.add(pn532StartCode1);
  checksum += Uint8(pn532StartCode1);
  finalCommandsList.add(pn532StartCode2);
  checksum += Uint8(pn532StartCode2);

  finalCommandsList.add(commandLength.value);
  finalCommandsList.add((~commandLength + Uint8(1)).value);

  // adding the actual commands to the final list
  //and calculate checksum with it
  for (int command in commands) {
    finalCommandsList.add(command);
    checksum += Uint8(command);
  }

  finalCommandsList.add((~checksum).value);
  finalCommandsList.add(pn532Postamble);

  // sending the commands
  pn532ProtocolImpl.writeData(finalCommandsList);
}