#include <SPI.h>
#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>

#define button1    4                       // Button B1 is connected to Arduino pin 9
#define button2    5                       // Button B2 is connected to Arduino pin 8

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

void setup() {
  Serial.begin(9600);
  pinMode(button1, INPUT_PULLUP);
  pinMode(button2, INPUT_PULLUP);
  delay(1000);

  display.begin(SSD1306_SWITCHCAPVCC, 0x3C);
  
  display.clearDisplay();
  display.display();
  display.setTextColor(WHITE, BLACK);
}

char Calendar[] = "  /  /20  ";
byte i,   date, month, year;

void Clock_display(){
  // Convert BCD to decimal
  date   = 12;
  month  = 5;
  year   = 22;
  // End conversion

  Calendar[9] = year   % 10 + 0x30;
  Calendar[8] = year   / 10 + '0';
  Calendar[4] = month  % 10 + 48;
  Calendar[3] = month  / 10 + '0';
  Calendar[1] = date   % 10 + 0x30;
  Calendar[0] = date   / 10 + 48;

  draw_text(4,  18, Calendar, 2); //输出x,y ，函数，字号
}
 
void blink_parameter(){
  byte j = 0;
  while(j < 10 && digitalRead(button1) && digitalRead(button2)){
    j++;
    delay(25);
  }
}

byte edit(byte x_pos, byte y_pos, byte parameter){
  char text[3];
  Serial.print(F("检查:"));
  Serial.print(i);
  Serial.print(F(" 输入:"));
  Serial.println(parameter);
  sprintf(text,"%02u", parameter);
  while(!digitalRead(button1));                      // Wait until button B1 released
  while(true){
    while(!digitalRead(button2)){                    // If button B2 is pressed
      parameter++;
      if(i == 0 && parameter > 31)                   // If date > 31 ==> date = 1
        parameter = 1;
      if(i == 1 && parameter > 12)                   // If month > 12 ==> month = 1
        parameter = 1;
      if(i == 2 && parameter > 99)                   // If year > 99 ==> year = 0
        parameter = 0;
      sprintf(text,"%02u", parameter);
      draw_text(x_pos, y_pos, text, 2);
      Serial.print(F("X:"));
      Serial.print(x_pos);
      Serial.print(F(" Y:"));
      Serial.print(y_pos);
      Serial.print(F("数据:"));
      Serial.println(text);
      delay(200);                                    // Wait 200ms
    }
    draw_text(x_pos, y_pos, "  ", 2);
    blink_parameter();
    draw_text(x_pos, y_pos, text, 2);
    blink_parameter();
    if(!digitalRead(button1)){                       // If button B1 is pressed
      i++;                                           // Increament 'i' for the next parameter
      Serial.print(F("循环:"));
      Serial.println(i);
      return parameter;                              // Return parameter value and exit
      
    }
  }
}

void draw_text(byte x_pos, byte y_pos, char *text, byte text_size) {
  display.setCursor(x_pos, y_pos);
  display.setTextSize(text_size);
  display.print(text);
  display.display();
}

void loop() {
  if(!digitalRead(button1)){                    // If button B1 is pressed
    i = 0;
    while(!digitalRead(button1));               // Wait for button B1 release
    date   = edit(4, 18, date);                 // Edit date
    month  = edit(40, 18, month);               // Edit month
    year   = edit(100, 18, year);               // Edit year
    delay(200);                                 // Wait 200ms
  }

  Clock_display();                              // Diaplay time & calendar
  delay(50);                                    // Wait 50ms 
}
// End of code.