//UA3REO Arduino Sequencer

//Ports definition
#define LNA_OUT 4 //D4
#define PA_OUT 3 //D3
#define TRX_PTT_OUT 5 //D5
#define PTT_IN 2 //D2

#define STEP_DELAY 20 //step delay in milliseconds

bool need_update = false;

void setup()
{
  pinMode(LNA_OUT, OUTPUT);
  pinMode(PA_OUT, OUTPUT);
  pinMode(TRX_PTT_OUT, OUTPUT);
  pinMode(PTT_IN, INPUT_PULLUP);

  digitalWrite(LNA_OUT, HIGH);
  digitalWrite(PA_OUT, HIGH);
  digitalWrite(TRX_PTT_OUT, HIGH);

  attachInterrupt(0, ptt_interrupt, CHANGE); //D2 - INT.0
}

void loop()
{
  if(need_update)
  {
    bool ptt_in_status = digitalRead(PTT_IN);
    if(ptt_in_status) //TX->RX
    {
      
      digitalWrite(TRX_PTT_OUT, HIGH);
      delay(STEP_DELAY);
      digitalWrite(PA_OUT, HIGH);
      delay(STEP_DELAY);
      digitalWrite(LNA_OUT, LOW);
    }
    else //RX->TX
    {
      digitalWrite(LNA_OUT, HIGH);
      delay(STEP_DELAY);
      digitalWrite(PA_OUT, LOW);
      delay(STEP_DELAY);
      digitalWrite(TRX_PTT_OUT, LOW);
    }
  }
}

void ptt_interrupt()
{
  need_update = true;
}