// ALEXSANDER LIMAN
// liman324@yandex.ru
// rcl-radio.ru
// 09.04.21

#ifndef TDA7303_H
#define TDA7303_H

#define TDA7303_address 0b1000100 

#include <Arduino.h>
class TDA7303
{
  public:
    TDA7303();
    void volume(byte vol); // byte 0...63 === 0...-78.75 dB (step 1.25 dB) 
    void att_lr(byte lr);  // byte 0...30 === 0...-37.5 dB (step 1.25 dB), byte 31 === mute
    void att_rr(byte rr);  // byte 0...30 === 0...-37.5 dB (step 1.25 dB), byte 31 === mute
    void att_lf(byte lf);  // byte 0...30 === 0...-37.5 dB (step 1.25 dB), byte 31 === mute
    void att_rf(byte rf);  // byte 0...30 === 0...-37.5 dB (step 1.25 dB), byte 31 === mute
    void audio_sw(byte in, bool loud, byte loud_gain);
      // byte 0...2 === input 0...2, byte 3 === Not allowed
      // bool 0...1 === loudness_on...loudness_off
      // byte 0...3 === loudness_gain 11.25...0 dB
    void set_bass(char bass); // int -7...7 === bass -14...+14 dB
    void set_treb(char treb); // int -7...7 === treble -14...+14 dB
	
  private:
	void writeWire(byte a);
};
	
#endif //TDA7303_H

#include <Arduino.h>
#include <Wire.h>
#include "TDA7303.h"

TDA7303::TDA7303(){
	Wire.begin();
}

void TDA7303::volume(byte vol){
     writeWire(0b00000000 + vol); 
}

void TDA7303::att_lr(byte lr){
     writeWire(0b11000000 + lr); 
}

void TDA7303::att_rr(byte rr){
     writeWire(0b11100000 + rr); 
}

void TDA7303::att_lf(byte lf){
     writeWire(0b10000000 + lf); 
}

void TDA7303::att_rf(byte rf){
     writeWire(0b10100000 + rf); 
}

void TDA7303::audio_sw(byte in, bool loud, byte loud_gain){
     writeWire(0b01000000 + in + (loud << 2) + (loud_gain << 3));
}

void TDA7303::set_bass(char bass){
      if(bass >= 0){writeWire(0b01100000 + 15 - bass);}
      if(bass < 0){writeWire( 0b01100000 + 7 + bass);}
}

void TDA7303::set_treb(char treb){
      if(treb >= 0){writeWire(0b01110000 + 15 - treb);}
      if(treb < 0){writeWire( 0b01110000 + 7 + treb);}
}

void TDA7303::writeWire(byte a){
  Wire.beginTransmission(TDA7303_address);
  Wire.write (a);
  Wire.endTransmission();
}

#include <Wire.h> 
#include <TDA7303.h>

TDA7303 tda;
 
void setup(){}

void loop(){
  audio();
  delay(1000);
}
  
void audio(){
    tda.volume(0);  // byte 0...63 === 0...-78.75 dB (step 1.25 dB) 
    tda.att_lr(0);  // byte 0...30 === 0...-37.5 dB (step 1.25 dB), byte 31 === mute
    tda.att_rr(0);  // byte 0...30 === 0...-37.5 dB (step 1.25 dB), byte 31 === mute
    tda.att_lf(0);  // byte 0...30 === 0...-37.5 dB (step 1.25 dB), byte 31 === mute
    tda.att_rf(0);  // byte 0...30 === 0...-37.5 dB (step 1.25 dB), byte 31 === mute
    tda.audio_sw(0, 1, 3);
      // byte 0...2 === input 0...2, byte 3 === Not allowed
      // bool 0...1 === loudness_on...loudness_off
      // byte 0...3 === loudness_gain 11.25...0 dB
    tda.set_bass(2); // char -7...7 === bass -14...+14 dB
    tda.set_treb(0); // char -7...7 === treble -14...+14 dB
}