/*
  Rotary Encoder volume control example

  Usage: rotate the knob to control the value,
  click the knob to change between volume/bass/treble.

  https://wokwi.com/arduino/projects/304919215794553409

  Released under the MIT license.
  Copyright (C) 2021, Uri Shaked.
*/
#include <EEPROM.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
#include <Fonts/FreeSansBold9pt7b.h>
#include <Fonts/Picopixel.h>

#define CLK A0
#define DT  A1
#define SW  A2

uint8_t v1;
uint8_t b1;
uint8_t t1;

typedef enum {f1,f2,f3,} Mf;
  
  
  


Mf df1=f1;

Adafruit_SSD1306 display(128, 64, &Wire, -1);

void  s8() {
  switch (df1) {
    case f1:
      df1 = f2;
      break;

    case f2:
      df1 = f3;
      break;

    case f3:
      df1 = f1;
      break;
  }
}

void up(int de) {
  switch (df1) {
    case f1:
      v1 = constrain(v1 + de, 0, 100);
      break;

    case f2:
      b1 = constrain(b1 + de, 0, 100);
      break;

    case f3:
      t1 = constrain(t1 + de, 0, 100);
      break;
  }
}



void uy() {
  display.clearDisplay();
  display.setFont();
  display.setTextColor(1);

  display.setCursor(42, 2);
  display.print("Volume");
  display.drawRoundRect(10, 12, 102, 9, 2, WHITE);
  display.fillRect(11, 13, v1, 7, WHITE);
  if (df1 == f1) {
    display.setCursor(32, 2);
    display.print(">");
  }

  display.setCursor(48, 22);
  display.print("Bass");
  display.drawRoundRect(10, 32, 102, 9, 2, WHITE);
  display.fillRect(11, 33, b1, 7, WHITE);
  if (df1 == f2) {
    display.setCursor(38, 22);
    display.print(">");
  }

  display.setCursor(42, 42);
  display.print("Treble");
  display.drawRoundRect(10, 52, 102, 9, 2, WHITE);
  display.fillRect(11, 53, t1, 7, WHITE);
  if (df1 == f3) {
    display.setCursor(32, 42);
    display.print(">");
  }

  display.display();
  
}

void setup() {
  Serial.begin(115200); 
  display.begin(SSD1306_SWITCHCAPVCC, 0x3C);
  pinMode(CLK, INPUT);
  pinMode(DT, INPUT);
  pinMode(SW, INPUT_PULLUP);
 
  R();
  if(df1>254){df1=0;v1=0;b1=0;t1=0;}
  

 uy(); 

}
long int mo = 0;
int pk = 1;
void loop() {
  if (digitalRead(SW)==0&&millis()-mo>300) {mo=millis();s8();uy();}
    
 int clk=digitalRead(CLK);   
 if(clk!=pk&&clk==0){int dt=digitalRead(DT);int de=dt==1?1:-1;up(de);uy();}   

pk=clk;Serial.println(df1);
E();  
}  
    
    
    
    
  
  


void R() {
v1=EEPROM.read(1);
b1=EEPROM.read(2);
t1=EEPROM.read(3);
df1=EEPROM.read(4);
}

void E() {
EEPROM.update(1,v1);
EEPROM.update(2,b1);
EEPROM.update(3,t1);
EEPROM.update(4,df1);

}