#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
#include <U8g2lib.h>


#define SCREEN_WIDTH 128
#define SCREEN_HEIGHT 64

// 创建显示器对象
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, -1); // -1 表示没有重置引脚
// 创建 U8g2 对象
U8G2_SSD1306_128X64_NONAME_F_HW_I2C u8g2(U8G2_R0);


const int a = 2;
const int b = 4;
const int c = 16;
const int d = 17;
const int e = 21;
const int f = 5;   // 使用GPIO 5
const int g = 18;  // 使用GPIO 18
const int dp = 19; // 小数点

void setup() {
  pinMode(a, OUTPUT);
  pinMode(b, OUTPUT);
  pinMode(c, OUTPUT);
  pinMode(d, OUTPUT);
  pinMode(e, OUTPUT);
  pinMode(f, OUTPUT);
  pinMode(g, OUTPUT);
  pinMode(dp, OUTPUT);


    Wire.begin(13, 14); // 设置新的 SDA 和 SCL 引脚
    if (!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) {
        Serial.println(F("SSD1306 allocation failed"));
        for (;;); // 无限循环
    }
    
    display.clearDisplay();
    display.setTextSize(1);
    display.setTextColor(SSD1306_WHITE);
    display.setCursor(0, 0);
    display.println("你好，我是中国人！");
    display.display();
}

void loop() {
  for(int i = 0;i<5;i++){
    displayNumber(i); // 显示数字3
    delay(1000); 
  }
}

void displayNumber(int num) {
  // 先将所有段熄灭
  digitalWrite(a, HIGH);
  digitalWrite(b, HIGH);
  digitalWrite(c, HIGH);
  digitalWrite(d, HIGH);
  digitalWrite(e, HIGH);
  digitalWrite(f, HIGH);
  digitalWrite(g, HIGH);
  
  // 根据数字点亮相应的段
  switch(num) {
    case 0:
      digitalWrite(a, LOW);
      digitalWrite(b, LOW);
      digitalWrite(c, LOW);
      digitalWrite(d, LOW);
      digitalWrite(e, LOW);
      digitalWrite(f, LOW);
      break;
    case 1:
      digitalWrite(b, LOW);
      digitalWrite(c, LOW);
      break;
    case 2:
      digitalWrite(a, LOW);
      digitalWrite(b, LOW);
      digitalWrite(d, LOW);
      digitalWrite(e, LOW);
      digitalWrite(g, LOW);
      break;
    case 3:
      digitalWrite(a, LOW);
      digitalWrite(b, LOW);
      digitalWrite(c, LOW);
      digitalWrite(d, LOW);
      digitalWrite(g, LOW);
      break;
    case 4:
      digitalWrite(f, LOW);
      digitalWrite(g, LOW);
      digitalWrite(b, LOW);
      digitalWrite(c, LOW);
      break;
    // 其他数字...
  }
}