void tx(repeater* myrpt) {
  if (myrpt->state > 1 && !myrpt->transmitter.tx) {
    myrpt->transmitter.tx = true;
    digitalWrite(PTT,LOW);
    delay(100);
    return;
  }

  if (!myrpt->transmitter.tx)
    return;

  myrpt->transmitter.tx = false;
  digitalWrite(PTT,HIGH);
}

void rx(repeater* myrpt) {
  myrpt->receiver.rx = digitalRead(COS);
  myrpt->gateway.receiver.rx = digitalRead(GW_COS);
  
  if (!myrpt->receiver.rx && !myrpt->gateway.transmitter.tx) {
    digitalWrite(GWPTT, true);
    myrpt->gateway.transmitter.tx = true;
    return;
  }

  if (myrpt->gateway.transmitter.tx) {
    digitalWrite(GWPTT, false);
    myrpt->gateway.transmitter.tx = false;
  }
}

void courtesyTone(repeater* myrpt) {
  switch(myrpt->params.courtesy) {
    case 0:
      myrpt->last == TT ? tone(3, myrpt->params.pip_pitch, myrpt->params.pip_length) : tone(3, myrpt->params.pip_gw_pitch, myrpt->params.pip_gw_length);
      break;
    case 1:
      myrpt->last == TT ? sendChar(myrpt->params.pip_speed,myrpt->params.pip_pitch,myrpt->params.pip_letter) : sendChar(myrpt->params.pip_speed,myrpt->params.pip_gw_pitch, myrpt->params.pip_gw_letter);
      break;
  }
  if (TAILPIPS)
    delay(150);
}