/*

  程序名称：Blynk_Test
  描述：
      Blynk控制ESP32连接的LED亮度

    1. 所需硬件：
      - ESP32 开发板 *1

    3. 本程序需要安装如下库（括号里是库的作者）：
      - Blynk ( by Volodymyr Shymanskyy ) V1.2.0
    
  作者：ChantionLAB·开物室

*/


/*--------------------------------------------------------------------------1--------------------------------------------------------------------------*/
/*--------------------------------------------------------------------本程序所引用库--------------------------------------------------------------------*/
#include <LiquidCrystal_I2C.h>
#include <Keypad.h>


/*--------------------------------------------------------------------------2--------------------------------------------------------------------------*/
/*-----------------------------------------------------------------------声明定义-----------------------------------------------------------------------*/
/*****************************< 常量声明 >*****************************/
const byte KEYPAD_ROWS = 4;         // 4行
const byte KEYPAD_COLS = 4;         // 4列
#define Membrane_Debounce_Time 200  // 薄膜按键消抖时间
// 为键盘上的每个位置赋值
const char Key_Map[KEYPAD_ROWS][KEYPAD_COLS] = {
  { '1', '2', '3', 'A' },
  { '4', '5', '6', 'B' },
  { '7', '8', '9', 'C' },
  { '*', '0', '#', 'D' }
};


byte yinfu[] = {
  B00010,
  B00011,
  B00010,
  B00010,
  B00010,
  B01110,
  B11110,
  B01100
};
const char TITLE[] = "MUSIC-PLAYER";

/*****************************< 引脚定义 >*****************************/
const int Buzzer_Pin = 10;

// 4*4薄膜按键正对用户，从左往右分别为行-列，对应引脚分别为 10,9,8,7, 6,5,4,3
const byte Row_Pins[KEYPAD_ROWS] = {  9, 8, 7,6 };
const byte Col_Pins[KEYPAD_COLS] = { 5, 4, 3,2 };

/*****************************< 变量声明 >*****************************/
int state = 0;
int Music_Record[100];
int Music_Times;

/*****************************< 对象声明 >*****************************/
LiquidCrystal_I2C lcd(0x27, 16, 2);
Keypad keypad = Keypad(makeKeymap(Key_Map), Row_Pins, Col_Pins, KEYPAD_ROWS, KEYPAD_COLS);


/*--------------------------------------------------------------------------3--------------------------------------------------------------------------*/
/*-------------------------------------------------------------------setup()程序初始化------------------------------------------------------------------*/
void setup() {
  /******************************< 启动串口通讯 >******************************/
  Serial.begin(9600);  // 初始化串口通信，并设置波特率为9600

  /******************************< 设置引脚模式 >******************************/
  pinMode(Buzzer_Pin, OUTPUT);  // 设置 引脚为输出模式

  /*******************************< 初始化LCD >********************************/
  init_IIC_LCD();
  default_Display();
}


/*--------------------------------------------------------------------------4--------------------------------------------------------------------------*/
/*-------------------------------------------------------------------loop()基础循环体-------------------------------------------------------------------*/
void loop() {
  char key = keypad.getKey();
  if (key) {
    Serial.println(key);
    switch (key) {
      case '1':
        setTone(1);
        Music_Record[Music_Times] = 1;
        Music_Times++;
        break;
      case '2':
        setTone(2);
        Music_Record[Music_Times] = 2;
        Music_Times++;
        break;
      case '3':
        setTone(3);
        Music_Record[Music_Times] = 3;
        Music_Times++;
        break;
      case '4':
        setTone(4);
        Music_Record[Music_Times] = 4;
        Music_Times++;
        break;
      case '5':
        setTone(5);
        Music_Record[Music_Times] = 5;
        Music_Times++;
        break;
      case '6':
        setTone(6);
        Music_Record[Music_Times] = 6;
        Music_Times++;
        break;
      case '7':
        setTone(7);
        Music_Record[Music_Times] = 7;
        Music_Times++;
        break;
      case 'B':  // 播放记录的音乐
        lcd.clear();
        default_Display();
        for (int i = 0; i < 100; i++) {
          if (Music_Record[i] > 0) {
            lcd.setCursor(i + 1, 1);
            lcd.print(Music_Record[i]);
            setTone(Music_Record[i]);
          } else {
            Music_Times = 0;
          }
        }
        break;
      case 'C':  // 清除记录
        for (int i = 0; i < 100; i++) {
          if (Music_Record[i] > 0) {
            Music_Record[i] = 0;
          }
        }
        Music_Times = 0;
        lcd.clear();
        break;
      case 'A':  // 退出
        for (int i = 0; i < 100; i++) {
          if (Music_Record[i] > 0) {
            Music_Record[i] = 0;
          }
        }
        Music_Times = 0;
        lcd.clear();
        ONF = 0;
        break;
    }

    for (int i = 0; i < 100; i++) {
      if (Music_Record[i] > 0) {
        lcd.setCursor(i + 1, 1);
        lcd.print(Music_Record[i]);
      }
    }
  }
}

/*--------------------------------------------------------------------------5--------------------------------------------------------------------------*/
/*-----------------------------------------------------------------------函数定义-----------------------------------------------------------------------*/
void init_IIC_LCD() {
  lcd.init();
  lcd.backlight();
  lcd.createChar(0, yinfu);
}

void default_Display() {
  lcd.setCursor((16 - strlen(TITLE)) / 2 - 1, 0);
  lcd.write(1);
  lcd.setCursor((16 - strlen(TITLE)) / 2 + strlen(TITLE), 0);
  lcd.write(1);

  for (int i = 0; i < strlen(TITLE); i++) {
    lcd.setCursor((16 - strlen(TITLE)) / 2 + i, 0);
    lcd.print(TITLE[i]);
  }
}

void playTone(int tonePin, int period, int duration) {
  int pulse = period / 2;
  for (long i = 0; i < duration * 1000L; i += period) {
    digitalWrite(tonePin, HIGH);
    delayMicroseconds(pulse);
    digitalWrite(tonePin, LOW);
    delayMicroseconds(pulse);
  }
}
void setTone(int num) {
  playTone(Buzzer_Pin, 15289 / (pow(2, num - 1)), 200);
  // noTone(Buzzer_Pin);
}