DIY Si4730 All Band Radio (LW, MW, SW, FM) © GPL3+

/**************************************************************************************************
  JCR Si4730/5 Receiver LW/MW/SW/FM - Version to share. See schematics for wiring details.
  Written by Julio C. Rosa - The CesarSound - May/2019

  Commands:
  radio.volumeUp(); radio.volumeDown();radio.seekDown(); radio.seekUp(); radio.mute(); radio.unmute();
  radio.setMode(FM); radio.tuneFrequency(9490); radio.getStatus(); radio.getVolume(); radio.getMode();
  radio.getMute(); radio.toggleMute();
  RSQMetrics rsq; radio.getRSQ(&rsq); (rsq.stereo); print_number(rsq.stereoBlend); print_number(rsq.SNR);
  (rsq.seekable); print_number(rsq.RSSI);
  print_mode(); print_station_freq(); print_volume(); print_mute(); print_home();
  radio.getCallSign(callSign); printp(rds1); Serial.write(callSign); radio.getProgramTypeStr(programType);
  Serial.write(programType); (rds1); (rds2); (rds3); (rds4); (rds5);

*****************************************************************************************************/

// Library
#include <Si4735.h>
#include <LiquidCrystal.h>
#include <rotary.h>
#include "Wire.h"

// I/O Settings
Rotary r = Rotary(2, 3);
LiquidCrystal lcd(12, 13, 7, 6, 5, 4);

const byte band = A0;

// Variable setting
unsigned int freq = 880;
unsigned int freqmax = 10800;
unsigned int freqmin = 50;
unsigned int fstep = 10;
unsigned int freqold;
unsigned int buttonstate;
unsigned int count = 15;

// Create an instance of the Si4730/5 named radio.
Si4735 radio;

void setup() {
  lcd.begin(16, 2);

  PCICR |= (1 << PCIE2);
  PCMSK2 |= (1 << PCINT18) | (1 << PCINT19);
  sei();

  //Pushbutton seletor de bandas
  pinMode(band, INPUT_PULLUP);

  // Initialize the radio. Possible modes are AM, FM, SW, LW.
  radio.begin();
  radio.setMode(AM);

  command_am();

  // Set the initial Frequency
  radio.tuneFrequency(freq);

  lcd.setCursor(0, 2);
  lcd.print("JCR Multiband Rx");

  lcd.setCursor(0, 0);
  lcd.print("F>>");
  lcd.setCursor(3, 0);
  lcd.print(":");
  lcd.setCursor(13, 0);
  lcd.print("kHz");
}

// Encoder Interrupt
ISR(PCINT2_vect) {
  unsigned char result = r.process();
  if (result) {
    if (result == DIR_CW) {
      freq = freq + fstep;
      if (freq >= freqmax) {
        freq = freqmax;
      }
    }
    else {
      freq = freq - fstep;
      if (freq <= freqmin) {
        freq = freqmin;
      }
    }
  }
}

void loop() {
  if (freqold != freq) {
    tune();
  }
  freqold = freq;

  lcd.setCursor(5, 0);
  lcd.print(freq);
  lcd.print("  ");

  buttonstate = digitalRead(band);  // Seletor de bandas
  if (buttonstate == LOW) {
    inc_preset();
    while (digitalRead(band) == 0);
  }

  // Medidor - S-Meter (dBu) e SNR (dB) - uncomment if want to use
    RSQMetrics rsq;
    radio.getRSQ(&rsq);
    lcd.setCursor(0, 2);
    lcd.print("dBu: ");
    lcd.print(rsq.RSSI);
    lcd.setCursor(9, 2);
    lcd.print("dB: ");
    lcd.print(rsq.SNR);
}

// Presets INC
void inc_preset() {
  count++;
  if (count > 15)
    count = 1;
  bandpresets();
  delay(100);
}

// Presets Seletor de Bandas
void bandpresets() {

  lcd.setCursor(0, 0);
  switch (count)  {
    case 1:
      freq = 370;
      radio.setMode(LW);
      radio.tuneFrequency(freq);
      command_am();
      fstep = 5;
      lcd.print("LW1");
      break;
    case 2:
      freq = 620;
      radio.setMode(AM);
      radio.tuneFrequency(freq);
      fstep = 5;
      lcd.print("MW1");
      break;
    case 3:
      freq = 840;
      radio.setMode(AM);
      radio.tuneFrequency(freq);
      fstep = 5;
      lcd.print("MW2");
      break;
    case 4:
      freq = 3700;
      radio.setMode(SW);
      radio.tuneFrequency(freq);
      fstep = 5;
      lcd.print("SW0");
      break;
    case 5:
      freq = 4985;
      radio.setMode(SW);
      radio.tuneFrequency(freq);
      fstep = 5;
      lcd.print("SW1");
      break;
    case 6:
      freq = 6010;
      radio.setMode(SW);
      radio.tuneFrequency(freq);
      fstep = 1;
      lcd.print("SW2");
      break;
    case 7:
      freq = 7200;
      radio.setMode(SW);
      radio.tuneFrequency(freq);
      fstep = 1;
      lcd.print("SW3");
      break;
    case 8:
      freq = 10000;
      radio.setMode(SW);
      radio.tuneFrequency(freq);
      fstep = 5;
      lcd.print("SW4");
      break;
    case 9:
      freq = 11940;
      radio.setMode(SW);
      radio.tuneFrequency(freq);
      fstep = 5;
      lcd.print("SW5");
      break;
    case 10:
      freq = 13710;
      radio.setMode(SW);
      radio.tuneFrequency(freq);
      fstep = 5;
      lcd.print("SW6");
      break;
    case 11:
      freq = 15400;
      radio.setMode(SW);
      radio.tuneFrequency(freq);
      fstep = 5;
      lcd.print("SW7");
      break;
    case 12:
      freq = 17560;
      radio.setMode(SW);
      radio.tuneFrequency(freq);
      fstep = 5;
      lcd.print("SW8");
      break;
    case 13:
      freq = 21505;
      radio.setMode(SW);
      radio.tuneFrequency(freq);
      fstep = 5;
      lcd.print("SW9");
      break;
    case 14:
      freq = 27015;
      radio.setMode(SW);
      radio.tuneFrequency(freq);
      fstep = 5;
      lcd.print("CB1");
      break;
    case 15:
      freq = 9700;
      radio.setMode(FM);
      radio.tuneFrequency(freq);     
      fstep = 10;
      lcd.print("FM1");
      break;
  }
}

//Sintonizador - tuner
void tune() {
  radio.tuneFrequency(freq);
}

//Commands soft mute off / AVC max gain
void command_am() {
  radio.setProperty(PROP_AM_SOFT_MUTE_MAX_ATTENUATION, 0); // 0 (OFF) - 63
  radio.setProperty(PROP_AM_AUTOMATIC_VOLUME_CONTROL_MAX_GAIN, 0x3A98); // 1000 - 7800
}