/*
 BITX program for 60 M (USA allocation) Raduino
 V 1.1   Don Cantrell, ND6T  25 March 2017
 Compiles under etherkit Si5351 library v 2.0.1
 This source file is under General Public License version 3.0
 Reduced Si5351 updates
 Simplified sketch. No metering.
 */
#include <si5351.h>
Si5351 si5351;
#include <LiquidCrystal.h>
LiquidCrystal lcd(8,9,10,11,12,13);

  int channel = 1; //Initial channel number
  unsigned long post;
  float BFO = 11999045;    //My BFO frequency
  float LO = BFO + 5330500;  //Local Oscillator for Upper sideband,CH.1
  float frequency;
   
void setup() {
   
    lcd.begin(16, 2);
    si5351.init(SI5351_CRYSTAL_LOAD_8PF,25004920,0); //My actual ref osc freq.
    si5351.set_pll(SI5351_PLL_FIXED, SI5351_PLLA);
}

void loop() {
 
  int tune = analogRead(A7);// Read the input on analog pin 7:
  
//Set switching at knob limits and increment channel selection
    if (tune>1000) {
      ++channel; 
      post=millis(); //Stake a time post for channel update limit 
    }
    if (channel > 5)channel = 1;
    
 switch (channel) {
    case 1: 
      frequency = 5330500;
         break;
     case 2: 
      frequency = 5346500;
         break;
     case 3: 
      frequency = 5357000;
         break;
     case 4: 
      frequency = 5371500;
          break;
     case 5: 
      frequency = 5403500;
         break;
     } 
  if(millis()-post<100){     // Update 5351 only if under 100 ms
  LO = BFO + frequency;
  si5351.set_freq(LO * 100, SI5351_CLK2);  //Program the synthesizer
  show();
  delay(1000); // Slow down tuning
   }
}  
 void show() {      
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Ch.");
  lcd.print(channel);
  lcd.print(" ");
  lcd.print ((LO-BFO)/1e6,4);//Calculate & show frequency
  lcd.print(" MHz");
 }