1734-OW2

1734-OW2

1734-OW2

1734-OW2

只需在前面加上液晶、通讯模块的初始化及全局变量的初始化就构成了main()程序。流程图中的几个重要模块说明如下：

初始化并显示页面包括以下几个操作：

(1) 调用一清屏函数ClearPage()，清除上次页面的遗留物；

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(2) 显示当前页面内容。如前所说，页面由静态文本和动态数据两部分组成，因此这里也分两步显示页面内容：

a.调用DisplayTxt(unsigned char*)函数显示当前页面的静态文本，静态文本在屏幕上是逐行分布的，举例来说，一个256*128点阵的液晶屏幕，显示一个汉字需16*16，英文字符需8*16，因此，整个屏幕可以分成8行，每行可显示16个汉字或32个英文字符。调用8次DisplayTxt函数就可完成页面的静态文本的显示。DisplayTxt函数所带的行参就是指向某一行文本的指针。

b.显示当前页面的动态数据。首先页面应刷新保存在缓冲区内的当前页面的动态数据，此步骤调用Refr eshData(STRUCT*)，传递参数是一个指向页面结构的指针。该函数负责从控保单元的数据采集CPU得到实时动态数据，并保存在本地缓冲区以备显示。然后页面调用DisplayData()显示动态数据。

       键盘扫描循环是一无条件的while()循环，它通过键盘扫描函数ScanKeyboard()返回键码并进行相应的操作，直到接收到的按键会导致页面切换为止，这时，根据当前页面的一个指针所指的新页面，程序结束当前页面，转而进入新页面的生命周期。循环中，除了包含键扫描函数ScanKeyboard()外，如果该页面有动态数据，还应包含刷新数据的函数RefreshData(STRUCT*)，以保持数据的实时性。

       处理按键是用一个两层嵌套的switch-case语句来实现的。如前面1.2节所述，将按键分为5类，而每一类按键又根据当前页面不同类型分别进行处理。

默认处理一般可设为不响应。

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