/* Avcomm_HF_Tranceiver 
  18_Jun_21 Version 1'0
  Combination of HF_sequencer_wkg_1_0 and HF_Synth_ver_1 samall
  D3 is Ptt to Amp, A6 is Ptt input, D2 is drive inhibit relay
  D4 is Antenna-coax relay
*/
// libraries for the Synth

#include <Wire.h>
#include <Adafruit_SI5351.h>

Adafruit_SI5351 clockgen = Adafruit_SI5351();

  //variables for the sequencer
  int inhibit=2; // on pin Digital 2 INHIBIT
  int ptt=A6; // PTT input on pin Analog A6
  int bias=3; // Bias enable on amp
  int relay=4; // output Relay
  
  int tx = 1000; // put ptt into receive
     

void setup() 
{
 //setup sequencer
  
  pinMode(inhibit, OUTPUT); // set inhibit pin as an output
  pinMode(ptt, INPUT); //set PTT input pin as an input
  pinMode(bias, OUTPUT);  //bias pin set as an output
  pinMode(relay, OUTPUT);  //relay pin set as an output
  
  // pinMode(ptt, INPUT_PULLUP); //ptt input high - not needed
  
  digitalWrite(inhibit, LOW); // set inhibit to off
  analogWrite(ptt, 255); // set ppt high
  digitalWrite(bias, LOW); // set amp to off
  digitalWrite(relay, LOW); // set output relay to Rx (off)
  
  delay(3000); // wait 3 seconds before starting
  Serial.begin(9600);
  
  Serial.println("Si5351 Clockgen Test"); Serial.println("");
  
  /* Initialise the sensor */
  if (clockgen.begin() != ERROR_NONE)
  {
    /* There was a problem detecting the IC ... check your connections */
    Serial.print("Ooops, no Si5351 detected ... Check your wiring or I2C ADDR!");
    while(1);
  }
  Serial.println("OK!");

  /* INTEGER ONLY MODE --> most accurate output */  
  /* Setup PLLA to integer only mode @ 900MHz (must be 600..900MHz) */
  /* Set Multisynth 1 to 28MHz  but integer only mode (div by 4/6/8) */
  /* 25MHz * 28 = 700 MHz, then 700 MHz / 25 = 28 MHz */
  Serial.println("Set PLLA to 700MHz");
  Serial.print("  \r\n");   // Print a return and new line 
  clockgen.setupPLLInt(SI5351_PLL_A, 28);
  Serial.println("Set Output #1 to 28.0 MHz");  
  Serial.print("  \r\n");   // Print a return and new line 
  clockgen.setupMultisynth(1, SI5351_PLL_A, 25, 0, 1);
  
  /* Enable the clocks */
  clockgen.enableOutputs(true);
  
}

/**************************************************************************/
/*
    Arduino loop function, called once 'setup' is complete (your own code
    should go below) -  A sample sequencer code follows - check that it has
    the right sequence for your hardware
*/
/**************************************************************************/
void loop() 
{
 // code for sequencer
 
     int tx = analogRead(ptt);
 
    if (tx <= 10) { // go to transmit

//  ptt detected as earthed; - start Tx sequence otherwise jump    
    
      digitalWrite(relay, HIGH); //RF output relay set to Tx  
      delay(60); // 60 ms to let the antenna relay switch
      digitalWrite(bias, HIGH); //Amp bias energised ON
      delay(30); // 30 ms to let the bias relay switch
      digitalWrite(inhibit, HIGH); //apply the drive to PA
      delay(60); // 60 ms to let the inhibit relay switch
 //Serial.print
      Serial.print(tx);
      Serial.print("  \r\n");   // Print a return and new line 
      Serial.print("Transmit"); 
    }
  
    if (tx >= 10) { // go to receive
      
//    ptt detected as earthed to start Receive sequence

      digitalWrite(inhibit, LOW); //Drive immediately removed from PA
      delay(60); // 60 ms delay for inhibit relay to operate
      digitalWrite(bias, LOW); //Amplifier bias volts terned off
      delay(60); // 60 ms to let the bias volts goto zero
      digitalWrite(relay, LOW); //RF output relay set to Receive
      
      Serial.print(tx);
      Serial.print("  \r\n");   // Print a return and new line 
      Serial.print("Receive"); 
      
    }    
  delay(10); // delay and go back and test for a change in tx/rx  
  
}