pga2311u + oled 0.96

#define CLK_ENC      9
#define DT_ENC      10
#define SW_ENC       8

#define CS_PGA       2
#define SCLK_PGA     3
#define DATA_PGA     4

#define BUTTON_INPUT A0
#define BUTTON_POWER A1
#define BUTTON_MUTE A2

#define OUT_IN_1      5
#define OUT_IN_2      6
#define OUT_IN_3      7

#define OUT_POWER    13
#define OUT_MUTE     12

#include <Wire.h> 
#include <EEPROM.h>
#include <U8glib.h>   // https://github.com/olikraus/u8glib/
#include <Encoder.h>  // http://rcl-radio.ru/wp-content/uploads/2019/05/Encoder.zip
#include <MsTimer2.h> // http://rcl-radio.ru/wp-content/uploads/2018/11/MsTimer2.zip
#include <CS3310.h>   // http://rcl-radio.ru/wp-content/uploads/2020/11/CS3310.zip

Encoder myEnc(CLK_ENC, DT_ENC);
CS3310 pga(CS_PGA,SCLK_PGA,DATA_PGA);
// U8GLIB_SH1106_128X64 u8g(U8G_I2C_OPT_DEV_0|U8G_I2C_OPT_FAST);// OLED_1.3
U8GLIB_SSD1306_128X64 u8g(U8G_I2C_OPT_DEV_0|U8G_I2C_OPT_NO_ACK|U8G_I2C_OPT_FAST);// OLED_0.96

long times,oldPosition  = -999,newPosition;
int vol,menu,in,ball,vol_old;
bool mute=0,w=1,w1,power=0;

void setup(){
  Wire.begin();Serial.begin(9600);
  MsTimer2::set(1, to_Timer);MsTimer2::start();
  if(EEPROM.read(100)!=0){for(int i=0;i<101;i++){EEPROM.update(i,0);}}
  pinMode(BUTTON_INPUT,INPUT_PULLUP); // КНОПКА INPUT
  pinMode(BUTTON_POWER,INPUT_PULLUP); // КНОПКА POWER 
  pinMode(BUTTON_MUTE,INPUT_PULLUP); // КНОПКА MUTE 
  pinMode(OUT_POWER,OUTPUT); digitalWrite(OUT_POWER,LOW);
  pinMode(OUT_MUTE,OUTPUT);
  u8g.firstPage();  
   do {
  u8g.setFont(u8g_font_profont12r); 
  u8g.drawStr(20,10,"AUDIO PROCESSOR");
  u8g.drawStr(42,35,"PGA2311");
  u8g.drawStr(30,55,"rcl-radio.ru");
  } while( u8g.nextPage() );
  delay(2000);
  vol = EEPROM.read(0);
  ball = EEPROM.read(1)-10;
  in = EEPROM.read(2);
  switch(in){
    case 0: digitalWrite(OUT_IN_1,HIGH);digitalWrite(OUT_IN_2,LOW);digitalWrite(OUT_IN_3,LOW);break;
    case 1: digitalWrite(OUT_IN_1,LOW);digitalWrite(OUT_IN_2,HIGH);digitalWrite(OUT_IN_3,LOW);break;
    case 2: digitalWrite(OUT_IN_1,LOW);digitalWrite(OUT_IN_2,LOW);digitalWrite(OUT_IN_3,HIGH);break;
    }
  audio();
  digitalWrite(OUT_POWER,HIGH);
  digitalWrite(OUT_MUTE,HIGH);
  }

void loop(){
/// MENU /////////////////////////////////////// 
if(power==0){
 if(digitalRead(SW_ENC)==LOW){menu++;if(menu>1){menu=0;}times=millis();w=1;w1=1;delay(200);}
 if(digitalRead(BUTTON_INPUT)==LOW){in++;if(in>2){in=0;}times=millis();w=1;w1=1;delay(200);}
 
 if(digitalRead(BUTTON_MUTE)==LOW&&mute==0){mute=1;menu=100;digitalWrite(OUT_MUTE,LOW);delay(300);
     u8g.firstPage();do {u8g.setFont(u8g_font_profont12r);u8g.drawStr(50,30,"MUTE");} while( u8g.nextPage() );}
 if(digitalRead(BUTTON_MUTE)==LOW&&mute==1){mute=0;w=1;menu=0;delay(300);digitalWrite(OUT_MUTE,HIGH);}
}
 if(digitalRead(BUTTON_POWER)==LOW&&power==0){power=1;menu=100;digitalWrite(OUT_MUTE,LOW);delay(300);
     u8g.firstPage();do {u8g.setFont(u8g_font_profont12r);u8g.drawStr(37,30,"POWER OFF");} while( u8g.nextPage() );digitalWrite(OUT_POWER,LOW);delay(3000);
     u8g.firstPage();do {} while( u8g.nextPage() );}
 if(digitalRead(BUTTON_POWER)==LOW&&power==1){power=0;w=1;menu=0;
 u8g.firstPage();do {u8g.setFont(u8g_font_profont12r);u8g.drawStr(37,30,"POWER ON");} while( u8g.nextPage() );delay(2000);digitalWrite(OUT_POWER,HIGH);digitalWrite(OUT_MUTE,HIGH);}
 
 
/////////////// VOLUME /////////////////////////////////////////////////////////
 if(menu==0&&mute==0&&power==0){
  if(newPosition != oldPosition&&mute==0){oldPosition = newPosition;
  if(newPosition>1){newPosition=1;}if(newPosition<-1){newPosition=-1;}
  vol=vol+newPosition;myEnc.write(0);newPosition=0;times=millis();w=1;w1=1;vol_func();audio();} 
 } 
 if(menu==1&&mute==0&&power==0){
 if(newPosition != oldPosition){oldPosition = newPosition;
 if(newPosition>1){newPosition=1;}if(newPosition<-1){newPosition=-1;}
  ball=ball+newPosition;myEnc.write(0);newPosition=0;times=millis();w=1;w1=1;ball_func();audio();}
 }

 
 if(w==1&&power==0){w=0;
  u8g.firstPage();  
   do {
  u8g.setFont(u8g_font_profont12r);if(menu==0){u8g.drawStr(0,10,"VOLUME");}else{u8g.drawStr(0,10,"volume");}
  for(int v_pos=0; v_pos<vol/1.5+1;v_pos+=4){u8g.drawBox(v_pos+45,2, 2, 8);}  
  u8g.setFont(u8g_font_profont15r);u8g.setPrintPos(35, 25);u8g.print(vol-100);u8g.drawStr(70,25,"dB");
  u8g.drawLine(0, 32, 128, 32);
  u8g.setFont(u8g_font_profont12r);if(menu==1){u8g.drawStr(0,45,"BALANCE");}else{u8g.drawStr(0,45,"balance");}
   for(int b0_pos=0; b0_pos<58+1;b0_pos+=4){u8g.drawBox(b0_pos+57,40, 2, 2);} 
   if(ball>=0){ for(int b1_pos=0; b1_pos<ball*3+1;b1_pos+=4){u8g.drawBox(b1_pos+85,37, 2, 8);}  }
   if(ball<=0){ for(int b2_pos=0; b2_pos>ball*3+1;b2_pos-=4){u8g.drawBox(b2_pos+85,37, 2, 8);}  }
  u8g.drawLine(0, 50, 128, 50);
 // u8g.setFont(u8g_font_profont12r);u8g.drawStr(0,64,"INPUT");
  switch(in){
    case 0: u8g.drawStr(20,64,">>>> AUX_1 <<<<");digitalWrite(OUT_IN_1,HIGH);digitalWrite(OUT_IN_2,LOW);digitalWrite(OUT_IN_3,LOW);break;
    case 1: u8g.drawStr(20,64,">>>> AUX_2 <<<<");digitalWrite(OUT_IN_1,LOW);digitalWrite(OUT_IN_2,HIGH);digitalWrite(OUT_IN_3,LOW);break;
    case 2: u8g.drawStr(20,64,">>>> AUX_3 <<<<");digitalWrite(OUT_IN_1,LOW);digitalWrite(OUT_IN_2,LOW);digitalWrite(OUT_IN_3,HIGH);break;
    }
   } while( u8g.nextPage() );}  
 

//////// EEPROM //////////////////////////////////////////////////
  if(millis()-times>10000 && w1==1 && mute==0 && power==0){EEPROM.update(0,vol);EEPROM.update(1,ball+10);EEPROM.update(2,in);menu=0;w1=0;w=1;}
   
  } 

void audio(){
  pga.setVol(vol*2+ball*2,vol*2-ball*2);// byte 1...255 === -95.5...+31.5 dB (step 0.5 dB)
//  Serial.println(vol*2+ball*2);
//  Serial.println(vol*2-ball*2);
  }   

void to_Timer(){newPosition = myEnc.read()/4;}
void vol_func(){if(vol<0){vol=0;}if(vol>117){vol=117;}}
void ball_func(){if(ball<-10){ball=-10;}if(ball>10){ball=10;}}