/* 
DESCRIPTION:  
  This sketch for the Arduino Uno controls a simple FM radio using an Si4703 radio
  receiver. The sketch allows control of the system and feedback to the user over
  serial. The system can seek radio stations, store three favorited radio stations,
  adjust volume, and print RDS information.
 
HARDWARE CONNECTIONS:
  * Si4703 VCC --> 3.3V
  * Si4703 GND --> GND
  * Si4703 SDIO --> A4
  * Si4703 SCLK --> A5
  * Si4703 RST --> D2
  * Si4703 GPIO2 --> D3
*/
 
#include <Si4703_Breakout.h>    // Load the SparkFun Si4703 library < https://cdn.sparkfun.com/assets/learn_tutorials/2/7/4/Si4703_Breakout.zip >
#include <Wire.h>
 
int resetPin = 2; // The Si4703 breakout RST pin connects to the Arduino D2 pin
int SDIO = A4;    // The Si4703 breakout SDIO pin connects to the Arduino A4 pin
int SCLK = A5;    // The Si4703 breakout SCLK pin connects to the Arduino A5 pin
 
// Initialize the Si4703_Breakout object
Si4703_Breakout radio(resetPin, SDIO, SCLK);
int channel;
int volume = 5;
char rdsBuffer[10];
 
// Favorite stations
int favA = 1076;    // Radiopopolare
int favB = 1067;    
int favC = 930;     //
//1025  1036  
 
void setup()
{
  // The Arduino communicates with the computer via serial
  Serial.begin(9600);
  // Si attende che la porta seriale sia pronta... necessaria da Arduino R4 in su
  while(!Serial);
  Serial.println("\n\nSi4703_Breakout Basic Radio");
  Serial.println("\n\nControls:");  
  Serial.println("a, b, c     Favourite stations");    // In the configuration above, you can set three favorite stations
  Serial.println("+, -     Volume (max 15)");
  Serial.println("u, d     Seek up / down");
  Serial.println("r,       Print RDS Data (15 sec timeout)");
  Serial.println("\n\n");
 
  radio.powerOn();    // Enable the Si4703
  radio.setVolume(5); // Set the starting volume to 5 (out of 15)
  // Mie aggiunte, uso pulsanti
  pinMode(13, INPUT); // Ricerca canale UP
  pinMode(12, INPUT); // Ricerca canale DOWN  
  pinMode(10, INPUT); // Volume +
  pinMode(9, INPUT); // Volume -  
  pinMode(7, INPUT); // Preferito 1
}
 
void loop()
{
  //---- Pulsanti ----
  //--SINTONIZZAZIONE
  if (digitalRead(13) == HIGH) {    
      channel = radio.seekUp();
      displayInfo();
      delay(500);
  } else if (digitalRead(12) == HIGH) {
      channel = radio.seekDown();
      displayInfo();
      delay(500);
  }
  //--VOLUME  
  if (digitalRead(10) == HIGH) {
      volume ++;
      if (volume == 16) volume = 15;
      radio.setVolume(volume);
      displayInfo();
      delay(800);
  } else if (digitalRead(9) == HIGH) {
      volume --;
      if (volume < 0) volume = 0;
      radio.setVolume(volume);
      displayInfo();
      delay(800);
  }
  //--PREFERITI
  if (digitalRead(7) == HIGH) { 
      radio.setChannel(favA);
      displayInfo();
      delay(500);
  }
  // Listen for serial commands
  if (Serial.available())
  {
    char ch = Serial.read();    
    if (ch == 'u') {        // u = seek up
      channel = radio.seekUp();
      displayInfo();
    } else if (ch == 'd') { // d = seek down
        channel = radio.seekDown();
        displayInfo();
    } else if (ch == '+') { // + = increase volume
      volume ++;
      if (volume == 16) volume = 15;
      radio.setVolume(volume);
      displayInfo();
    } else if (ch == '-') { // - = decrease volume
      volume --;
      if (volume < 0) volume = 0;
      radio.setVolume(volume);
      displayInfo();
    } else if (ch == 'a') { // a = favorite station a
      channel = favA;
      radio.setChannel(channel);
      displayInfo();
    } else if (ch == 'b') { // b = favorite station b
      channel = favB;
      radio.setChannel(channel);
      displayInfo();
    } else if (ch == 'c') { // c = favorite station c
        channel = favC;
        radio.setChannel(channel);
        displayInfo();
    } else if (ch == 'r') { // r = print RDS information
        Serial.println("RDS listening...");
        radio.readRDS(rdsBuffer, 15000);
        Serial.print("RDS info: ");
        Serial.println(rdsBuffer);      
    }
  }
}
 
// The displayInfo function prints the current channel and volume over serial
void displayInfo()
{
   Serial.print("Channel:"); Serial.print(channel); 
   Serial.print(" Volume:"); Serial.println(volume); 
}

while (!Serial)