// TEA5767 und Nokia 5110 LCD Display



#include <SPI.h>



#include <Adafruit_GFX.h>

#include <Adafruit_PCD8544.h>



// D7 - Serial clock out (CLK oder SCLK)

// D6 - Serial data out (DIN)

// D5 - Data/Command select (DC oder D/C)

// D3 - LCD chip select (CE oder CS)

// D4 - LCD reset (RST)

Adafruit_PCD8544 lcd = Adafruit_PCD8544(7, 6, 5, 3, 4);



#include <Wire.h>



#define button_frequency_up     13

#define button_frequency_down   12

#define button_mute             11



#define TEA5767_mute_left_right  0x06

#define TEA5767_MUTE_FULL        0x80

#define TEA5767_ADC_LEVEL_MASK   0xF0

#define TEA5767_STEREO_MASK      0x80





int old_frequency=-1;

int frequency=8000;



byte old_stereo=0;

byte stereo=1;



byte old_mute=1;

byte mute=0;



byte old_signal_level=1;

byte signal_level=0;



unsigned long last_pressed;



void setup(void) {

  

  pinMode(button_frequency_up, INPUT);

  pinMode(button_frequency_down, INPUT);

  pinMode(button_mute, INPUT);

  

  Wire.begin();

  

  TEA5767_set_frequency();



  lcd.begin();

  lcd.setContrast(50);

  lcd.clearDisplay();

   

  set_text(1,2,"FM Radio",BLACK,1);  

  //set_text(14,147,"blog.simtronyx.de",BLACK,1);

  

}





void loop() {



    if(frequency!=old_frequency){

      set_text(old_frequency>=10000?6:14,17,value_to_string(old_frequency),WHITE,2);

      set_text(frequency>=10000?6:14,17,value_to_string(frequency),BLACK,2);

      old_frequency=frequency;

    }

    

    TEA5767_read_data();

      

    if(old_stereo!=stereo){ 

        set_text(old_stereo?22:28,39,old_stereo?"Stereo":"Mono",WHITE,1);

        set_text(stereo?22:28,39,stereo?"Stereo":"Mono",BLACK,1);

        old_stereo=stereo;

    }

    

    if(old_signal_level!=signal_level){

        set_text(old_signal_level<10?76:70,39,String((int)old_signal_level),WHITE,1);

        set_text(signal_level<10?76:70,39,String((int)signal_level),BLACK,1);

        old_signal_level=signal_level;

        show_signal_level(signal_level);

    }

    

    if(old_mute!=mute){

        set_text(1,39,old_mute?"M":"S",WHITE,1);

        set_text(1,39,mute?"M":"S",BLACK,1);

        old_mute=mute;

    }

      

    delay(50);

    

  

  if(digitalRead(button_frequency_down)==HIGH){

    

    frequency=frequency-5;

    if(frequency<7600)frequency=10800;

    TEA5767_set_frequency();

  }

  if(digitalRead(button_frequency_up)==HIGH){

    

    frequency=frequency+5;

    if(frequency>10800)frequency=7600;

    TEA5767_set_frequency();

  }



  if(digitalRead(button_mute)==HIGH){

    

    TEA5767_mute();

  }

  

  delay(50);

  

}



unsigned char frequencyH = 0;

unsigned char frequencyL = 0;



unsigned int frequencyB;



unsigned char TEA5767_buffer[5]={0x00,0x00,0xB0,0x10,0x00};



void TEA5767_write_data(byte data_size){

   

  delay(50);

  

  Wire.beginTransmission(0x60);

  

  for(byte i=0;i<data_size;i++)

    Wire.write(TEA5767_buffer[i]);

  

  Wire.endTransmission();

  

  delay(50);

}



void TEA5767_mute(){ 

  

  if(!mute){   

    mute = 1;   

    TEA5767_buffer[0] |= TEA5767_MUTE_FULL;

    TEA5767_write_data(2);

//    TEA5767_buffer[0] &= ~TEA5767_mute;

//    TEA5767_buffer[2] |= TEA5767_mute_left_right;

  }   

  else{

    mute = 0;   

    TEA5767_buffer[0] &= ~TEA5767_MUTE_FULL;

    TEA5767_write_data(2);

//    TEA5767_buffer[0] |= TEA5767_mute;

//    TEA5767_buffer[2] &= ~TEA5767_mute_left_right;

  }

    

//  TEA5767_write_data(3);

}



void TEA5767_set_frequency()

{

  frequencyB = 4 * (frequency * 10000 + 225000) / 32768;

  TEA5767_buffer[0] = frequencyB >> 8;

  if(mute)TEA5767_buffer[0] |= TEA5767_MUTE_FULL;

  TEA5767_buffer[1] = frequencyB & 0XFF;

  

  TEA5767_write_data(5);

}



int TEA5767_read_data() {

  

  unsigned char buf[5];

  memset (buf, 0, 5);

  

  Wire.requestFrom (0x60, 5); 



  if (Wire.available ()) {

    for (int i = 0; i < 5; i++) {

      buf[i] = Wire.read ();

    }

        

    stereo = (buf[2] & TEA5767_STEREO_MASK)?1:0;

    signal_level = ((buf[3] & TEA5767_ADC_LEVEL_MASK) >> 4);

    

    return 1;

  } 

  else return 0;

}



void show_signal_level(int level){

  

  byte xs=68;

  byte ys=8;

  for(int i=0;i<15;i++){

    if(i%2!=0)lcd.drawLine(xs+i,ys,xs+i,ys-i/2,level>=i?BLACK:WHITE);

  }

}



void set_text(int x,int y,String text,int color,int textsize){

  

  lcd.setTextSize(textsize);

  lcd.setTextColor(color); 

  lcd.setCursor(x,y);     

  lcd.println(text);      

  lcd.display();         

}





String value_to_string(int value){

  

  String value_string = String(value / 100);

  value_string = value_string + '.' + ((value%100<10)?"0":"") + (value % 100);

  return value_string;

}