# SnakeC51
51单片机上实现贪吃蛇小游戏
![Watch the video](https://github.com/SherlockUnknowEn/SnakeC51/blob/main/ezgif-1-e72d609c69.gif)
### 游戏逻辑
单片机LED阵列一共8x8, `unsigned char map[8]` 记录地图数据,`unsigned char`数据类型8 bits,`map[i]` 中第`j`个bit 代表 第`i`行第`j`列是否被点亮
1. 单片机主函数中,不断刷新LED点阵,更新蛇的位置和食物的位置
```
while(1)
{
if (is_game_over()) {
light_all();
} else {
show_map(); // 根据蛇位置和食物的位置,点亮矩阵屏
k = keyboard(); // 尝试获取用户输入(蛇前进方向的改变)
dir_scan(k);
}
}
```
2. 使用`snake_body_x[64]`和`snake_body_y[64]`数组存储蛇的身体,`i = 0`位置为蛇头,单片机定时器中断函数中,每500ms移动蛇的位置,蛇头根据按键输入向前后左右其中一个方向移动,蛇后一节躯体向前一节躯体的位置移动,即
```
snake_body_x[0] = ? // 根据按键输入方向移动
snake_body_y[0] = ? // 根据按键输入方向移动
for (int i = 1; i < snake_len; i++) {
snake_body_x[i] = snake_body_x[i-1];
snake_body_y[i] = snake_body_y[i-1];
}
```
3. 如果蛇吃到食物,长度增加(蛇尾增加一节),刷新下一次食物的位置
```
// 如果吃到食物
if (snake_body_y[0] == food_y && snake_body_x[0] == food_x) {
snake_body_x[snake_len] = tail_x;
snake_body_y[snake_len] = tail_y;
snake_len++;
update_food();
}
```
4. 食物的位置刷新方法:获取当前未点亮的LED序号,如 [0, 3, 5, 7, 9, 14] 6栈未点亮,在 [0, 5]中取随机数,点亮其中一盏作为食物
```
unsigned char pos = rand() % (64 - snake_len);
// 找到第 pos 个未被点亮的LED作为食物的位置
```
5. 游戏结束判定,蛇碰到墙壁或者蛇头碰到自己的身体,游戏结束
```
unsigned int is_game_over() {
unsigned int i = 0;
// 如果碰到墙
if (snake_body_x[0] >= 8 || snake_body_x[0] < 0 || snake_body_y[0] >= 8 || snake_body_y[0] < 0) {
return 1;
}
// 如果蛇头碰到自己的身体
for (i = 1; i < snake_len; i++) {
if (snake_body_x[0] == snake_body_x[i] && snake_body_y[0] == snake_body_y[i]) {
return 1;
}
}
return 0;
}
```
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