#define CS    2  // LOAD PIN 10  LM1972
#define CLK   3  // SCLK PIN 9   LM1972
#define DATA  4  // DATA PIN 11  LM1972

#include <Wire.h> 
#include <EEPROM.h>
#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 <LiquidCrystal_I2C.h> //Библиотека -  http://forum.rcl-radio.ru/misc.php?action=pan_download&item=45&download=1
  LiquidCrystal_I2C lcd(0x27,16,2);  // Устанавливаем дисплей 
  Encoder myEnc(9, 8);//CLK, DT
  byte a1[8] = {0b00000,0b10101,0b10101,0b10101,0b10101,0b10101,0b10101,0b00000};
  byte a2[8] = {0b00000,0b10100,0b10100,0b10100,0b10100,0b10100,0b10100,0b00000};
  byte a3[8] = {0b00000,0b10000,0b10000,0b10000,0b10000,0b10000,0b10000,0b00000};  
  int vol,vol_d,z,z0,z1,vol_old;
  byte w,w1,mute;
  unsigned long times,oldPosition  = -999,newPosition;

void setup() {
  Wire.begin();Serial.begin(9600);
  lcd.init();lcd.backlight();
  MsTimer2::set(1, to_Timer);MsTimer2::start();
  lcd.createChar(0,a1);lcd.createChar(1,a2);lcd.createChar(2,a3);
  pinMode(CS,OUTPUT);
  pinMode(CLK,OUTPUT);
  pinMode(DATA,OUTPUT);
  pinMode(10,INPUT);       // кнопка энкодера MUTE   
  delay(100);
  vol = EEPROM.read(0);
  LM1972Write(0, vol);
  LM1972Write(1, vol); 
}

void loop() {
   /// MUTE ///////////////////////////////////////
   if(digitalRead(10)==LOW&&mute==0){mute=1;vol_old = vol;lcd.clear();lcd.setCursor(0,0);lcd.print("      MUTE   ");
   LM1972Write(0, 255);
   LM1972Write(1, 255);
   delay(300);}
   if(digitalRead(10)==LOW&&mute==1){mute=0;vol=vol_old;lcd.clear();w1=1;
   LM1972Write(0, vol); 
   LM1972Write(1, vol); 
   delay(300);}
 
   /////////////// VOLUME /////////////////////////////////////////////////////////
   if(mute==0){
   if (newPosition != oldPosition&&mute==0){oldPosition = newPosition;
   vol=vol-newPosition;myEnc.write(0);newPosition=0;times=millis();w=1;w1=1;vol_func();
   LM1972Write(0, vol); 
   LM1972Write(1, vol); 
   } 
   vol_d=map(vol,0,126,0,45);
   if(w1==1){
   for(z=0,z0=0,z1=0;z<=vol_d;z++,z1++){if(z1>2){z1=0;z0++;}
   if(z1==1){lcd.setCursor(z0,1);lcd.write((uint8_t)0);lcd.setCursor(z0+1,1);lcd.print("   ");}}
   if(z1==3){lcd.setCursor(z0,1);lcd.write((uint8_t)1);}
   if(z1==2){lcd.setCursor(z0,1);lcd.write((uint8_t)2);}w1=0;}
 
     lcd.setCursor(0,0);lcd.print("VOLUME    ");
     lcd.print(vol);lcd.print(" ");
   } 


 //////// EEPROM //////////////////////////////////////////////////
  if(millis()-times>10000 && w==1 && mute == 0){EEPROM.update(0,vol);w=0;w1=1;lcd.clear();}
}
void to_Timer(){newPosition = myEnc.read()/4;}
void vol_func(){if(vol<0){vol=0;}if(vol>126){vol=126;}}
void LM1972Write(byte ch, byte att){  
  digitalWrite(CLK,LOW);delay(1);digitalWrite(CS,LOW);
     for(int i = 7; i >= 0; i--){
        digitalWrite(DATA, (ch >> i) & 0x01);
        digitalWrite(CLK,HIGH);digitalWrite(CLK,LOW);}
     for(int i = 7; i >= 0; i--){
        digitalWrite(DATA, (att >> i) & 0x01);
        digitalWrite(CLK,HIGH);digitalWrite(CLK,LOW);}
        digitalWrite(CS,HIGH);delay(1);
        }

#define CS    2  // LOAD PIN 10  LM1972
#define CLK   3  // SCLK PIN 9   LM1972
#define DATA  4  // DATA PIN 11  LM1972

void setup() {
  Serial.begin(9600);
  pinMode(CS,OUTPUT);
  pinMode(CLK,OUTPUT);
  pinMode(DATA,OUTPUT);
  delay(100);
}

void loop() {
delay(1000);
  LM1972Write(0, 255); // CH0 , 0dB
  LM1972Write(1, 255); // CH1 , 0dB
  // channel 0 = 0x00, 1 = 0x01
  // att = 0dB...-78dB = int 0...126 (0...-48 step 0.5dB, -48...-78 step 1dB) /// int 255 = MUTE
}

void LM1972Write(byte ch, byte att){  
  digitalWrite(CLK,LOW);delay(1);digitalWrite(CS,LOW);
     for(int i = 7; i >= 0; i--){
        digitalWrite(DATA, (ch >> i) & 0x01);
        digitalWrite(CLK,HIGH);digitalWrite(CLK,LOW);}
     for(int i = 7; i >= 0; i--){
        digitalWrite(DATA, (att >> i) & 0x01);
        digitalWrite(CLK,HIGH);digitalWrite(CLK,LOW);}
        digitalWrite(CS,HIGH);delay(1);}