对于贪吃蛇这款游戏我们并不陌生，虽然它只是一个小游戏，但却不失为一个经典。

       今天我们也来写一个贪吃蛇游戏，用单片机实现，用纯C语言写的网上一大堆，写得也很好。额，参考了几个比较经典的，于是说干就干，动手自己写一个。好了，废话不多说，开始吧！！！

      由于代码比较多，在这里就不贴代码了，在"无聊游戏"功能模块可查看源代码，这里主要是说一说思路：

      既然是用单片机实现的，首先得有单片机，然后设计电路，编程，下载，完了........开玩笑的。

首先我们来看看电路图：

单片机最小系统

16 x 16 LED点阵

因为只有8 x 8 LED点阵，

所以需要扩展成16 x 16，

如下图：

16 x 16 LED点阵原理图如下：

一共16的管脚，怎么办呢？这也太多了吧。

在学习数字电路的时候我们知道有一种芯片

叫译码器(如：3-8线译码器)，在这里

我们也需要类似的芯片----74HC595，

看下图：

我们来看看有关这块芯片的资料：

MM54HC595/MM74HC595 8-Bit Shift Registers with Output Latches

General Description This high speed shift register utilizes advanced silicon-gate CMOS technology. This device possesses the high noise immunity and low power consumption of standard CMOS integrated circuits, as well as the ability to drive 15 LS-TTL loads. This device contains an 8-bit serial-in, parallel-out shift register that feeds an 8-bit D-type storage register. The storage register has 8 TRI-STATEÉ outputs. Separate clocks are provided for both the shift register and the storage register. The shift register has a direct-overriding clear, serial input, and serial output (standard) pins for cascading. Both the shift register and storage register use positive-edge triggered clocks. If both clocks are connected together, the shift register state will always be one clock pulse ahead of the storage register. The 54HC/74HC logic family is speed, function, and pin-out compatible with the standard 54LS/74LS logic family. All inputs are protected from damage due to static discharge by internal diode clamps to VCC and ground.

Features：

●Low quiescent current: 80 mA maximum (74HC Series) 

● Low input current: 1 mA maximum 

● 8-bit serial-in, parallel-out shift register with storage

● Wide operating voltage range: 2V–6V 

● Cascadable 

● Shift register has direct clear 

● Guaranteed shift frequency: DC to 30 MHz

老实说，英文不好是真的烦，看个资料花了我大部分时间。

不过好在我们有了大致的了解。

现在来用这块芯片去驱动那16 x 16LED点阵

嗯，万事俱备，只欠编程。

为了减少篇幅，请到"无聊游戏"功能模块查看源代码。