arduino uno+LCD12864（ST7735S)+蓝牙模块实现贪吃蛇

#include <SoftwareSerial.h>
#include <SPI.h>
#include "Ucglib.h"
#define maxlength 4 //蛇最大长度
Ucglib_ST7735_18x128x160_SWSPI ucg(/*sclk=*/13, /*data=*/11, /*cd=*/9, /*cs=*/10, /*reset=*/8);
SoftwareSerial BT(6, 7);
char val;//蓝牙接收字符
int snake_length = 1;//蛇目前长度
int snake_x[maxlength], snake_y[maxlength];
int direction = 6;//方向判断和闪屏控制
int x = 10;
int y = 10;//记录变化的位置
int food_x;
int food_y;//食物
int gameOver = 0;//结束条件
void setup(void) {
  //delay(1000);
  ucg.begin(UCG_FONT_MODE_TRANSPARENT);
  //ucg.begin(UCG_FONT_MODE_SOLID);
  ucg.clearScreen();
  BT.begin(9600);
  snake_x[0] = 10;
  snake_y[0] = 10;
  food_x = 10 + 10 * random(0, 9);
  food_y = 10 + 10 * random(0, 9);
}

void loop(void) {
  if (direction == 6) {//欢迎界面
    ucg.setFont(ucg_font_ncenR12_tr);//字体设置
    ucg.setPrintPos(40, 80);//设定显示坐标
    ucg.print("welcome");
  } else
    ucg.drawFrame(10, 10, 100, 100);//游戏区域，有没有无所谓
  if (BT.available()) {
    val = BT.read();
    if (val == 'w' && direction != 2) direction = 0;
    if (val == 's' && direction != 0) direction = 2;
    if (val == 'a' && direction != 1) direction = 3;
    if (val == 'd' && direction != 3) direction = 1;
  }
  if (direction == 0) y -= 10;  //w
  if (direction == 1) x += 10;  //d
  if (direction == 2) y += 10;  //s
  if (direction == 3) x -= 10;  //a

  if (x < 10) x = 100;
  if (x > 100) x = 10;
  if (y < 10) y = 100;
  if (y > 100) y = 10;//到达边界后穿过边界

  if (x == food_x && y == food_y) {//行动后吃到食物
    snake_length++;
    while (1) {
      int flag = 1;//跳出循环标志
      food_x = 10 + 10 * random(0, 9);
      food_y = 10 + 10 * random(0, 9);//重新生成一个食物

      for (int i = snake_length - 1; i >= 0; i--) {//遍历蛇身看食物是否生成在身上
        if ((food_x == snake_x[i]) && (food_y == snake_y[i]) || ((food_x == x) && (food_y == y))) {
          flag = 0;
          break;
        }
      }
      if (snake_length == maxlength) {//游戏结束条件
        gameOver = 1;
        direction=5;//结束后显示gameover时的闪屏控制
        break;
      }
      if (flag) break;
    }
  }

  if (direction != 6) {
    for (int i = snake_length - 1; i > 0; i--) {
      snake_x[i] = snake_x[i - 1];
      snake_y[i] = snake_y[i - 1];
    }
    snake_x[0] = x;
    snake_y[0] = y;
    if (gameOver) {
      if(direction==5){
        ucg.clearScreen();
        direction=1;
      }
      else{
        ucg.setFont(ucg_font_ncenR12_tr);
        ucg.setPrintPos(40, 80);
        ucg.print("gameover");
      }
      
    }
    if (!gameOver) {
      ucg.clearScreen();
      for (int i = 0; i < snake_length; i++) {
        ucg.drawFrame(snake_x[i], snake_y[i], 10, 10);
      }
      ucg.drawFrame(food_x, food_y, 10, 10);
    }
  }
}