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class="show">阅读模式</a> </div> </div> </div><div class="pct"><style type="text/css">.pcb{margin-right:0}</style><div class="pcb"> <div class="t_fsz"> <table cellspacing="0" cellpadding="0"><tr><td class="t_f" id="postmessage_150856"> <P>３ ＤＳＰ控制液晶<a href="http://display.oecr.com" target="_blank" class="relatedlink">显示</a>屏的<a href="http://opticaldesign.oecr.com" target="_blank" class="relatedlink">软件</a>设计</P> <P>这里通过液晶显示屏的初始化过程以及如何显示一幅图画来具体说明ＤＳＰ控制液晶显示屏的软件设计。</P> <P>需要显示的图片如图２所示。可以通过ＷＩＮＤＯＷＳ附带的画图工具制作这样一幅３２０×２４０的黑白位图。针对这款显示屏是由右向左显示的特点，需要将其垂直对称翻转，最后将处理过的图片以１６进制文件的形式烧入外部２７２５６中。该图片数据文件在ＤＳＰ外部空间的起始地址为：０Ｃ０００Ｈ。 </P> <TABLE cellSpacing=0 cellPadding=0 width=500 border=0> <TR> <TD> <DIV align=center><IMG src="http://www.chinaecnet.com/xsj04/image/xsj042041_2.gif"></DIV></TD></TR></TABLE> <P>由流程图(图３)可以看出，在系统硬件上电复位后，软件根据用户的需要自动对各项控制器指令代码及其参数进行设置，从而完成对液晶模块的参数?如液晶的行数、列数、扫描频率、光标的位置等?以及显示方式等一系列的初始化过程。在对系统进行正确的初始化以后，可以通过ＤＳＰ将外部ＲＯＭ中的数据直接送至ＳＥＤ１３３５显示缓冲区，控制器就可以控制液晶屏显示出用户所要的图画。同时用户也可以根据自己的需要在主程序运行的过程中改变图片显示的形式，只需在表１中选择相应的指令代码以及参数即可。 </P> <TABLE cellSpacing=0 cellPadding=0 width=500 border=0> <TR> <TD> <DIV align=center><IMG src="http://www.chinaecnet.com/xsj04/image/xsj042041_3.gif"></DIV></TD></TR></TABLE> <P>设置系统指令及其参数的方法如下：根据用户硬件<a href="http://electronic.oecr.com" target="_blank" class="relatedlink">电路</a>的设计，先将指令代码送到ＳＥＤ１３３５控制器的命令口地址；然后把该指令的参数依次送到数据口地址，经过系统指令及其参数的设置后，就可以把数据送到数据口地址。具体语法形式如下： </P> <TABLE cellSpacing=0 cellPadding=0 width=500 border=0> <TR> <TD> <DIV align=center><IMG src="http://www.chinaecnet.com/xsj04/image/xsj042041_4.gif"></DIV></TD></TR></TABLE> <P>指令设置语句：</P> <P>ＳＴＭ ＃ＸＸＨ?ＡＲ０ ；ＸＸＨ为指令代码 ＰＯＲＴＷ ＡＲ０?＃８１００Ｈ ；８１００Ｈ为命令口地址</P> <P>参数设置语句：</P> <P>ＳＴＭ ＃ＸＸＨ?ＡＲ０ ；ＸＸＨ为指令参数 ＰＯＲＴＷ ＡＲ０?＃８０００Ｈ ；８０００Ｈ为数据口地址 …………</P> <P>数据输入语句：</P> <P>ＳＴＭ ＃ＸＸＨ?ＡＲ０ ；ＸＸＨ为用户数据 ＰＯＲＴＷ ＡＲ０?＃８０００Ｈ ；８０００Ｈ为数据口地址 …………</P> <P>液晶显示屏的初始化程序如下：</P> <P>ＩＮＩＴ： ＳＴＭ ＃４０Ｈ?ＡＲ０ ；系统设置指令，指令代码：４０Ｈ ＰＯＲＴＷ ＡＲ０?＃８１００Ｈ ＳＴＭ ＃１０Ｈ?ＡＲ０ ；标准设置 ＰＯＲＴＷ ＡＲ０?＃８０００Ｈ ＳＴＭ ＃８７Ｈ?ＡＲ０ ；设置光标宽度为８ ＰＯＲＴＷ ＡＲ０?＃８０００Ｈ ＳＴＭ ＃０７Ｈ?ＡＲ０ ；设置光标高度为８ ＰＯＲＴＷ ＡＲ０?＃８０００Ｈ ＳＴＭ ＃２７Ｈ?ＡＲ０；设置ＬＣＤ每行需要的字节数， ＰＯＲＴＷ ＡＲ０?＃８０００Ｈ 每行３２０个点，行数为３２０／８ ＝４０ ＳＴＭ ＃３６Ｈ?ＡＲ０ ；设置液晶的扫描频率约为 ７０ＨＺ ＰＯＲＴＷ ＡＲ０?＃８０００Ｈ ＳＴＭ ＃０Ｆ０Ｈ?ＡＲ０ ；设置ＬＣＤ的点行数为２４０ ＰＯＲＴＷ ＡＲ０?＃８０００Ｈ ＳＴＭ ＃２８Ｈ?ＡＲ０ ；设置显示屏一行所占显缓 的字节数 ＰＯＲＴＷ ＡＲ０?＃８０００Ｈ ＳＴＭ ＃００Ｈ?ＡＲ０ ＰＯＲＴＷ ＡＲ０?＃８０００Ｈ</P> <P>ＳＴＭ ＃４４Ｈ?ＡＲ０ ；ＳＣＲＯＬＬ指令，指令代码：４４Ｈ ＰＯＲＴＷ ＡＲ０?＃８１００Ｈ ＳＴＭ ＃００Ｈ?ＡＲ０ ；确定第一显示区的首地址 ＰＯＲＴＷ ＡＲ０?＃８０００Ｈ ＳＴＭ ＃００Ｈ?ＡＲ０ ＰＯＲＴＷ ＡＲ０?＃８０００Ｈ ＳＴＭ ＃２４０Ｄ?ＡＲ０ ；设置第一显示区的行数 ＰＯＲＴＷ ＡＲ０?＃８０００Ｈ ＳＴＭ ＃００Ｈ?ＡＲ０ ；确定第二显示区的首地址 ＰＯＲＴＷ ＡＲ０?＃８０００Ｈ ＳＴＭ ＃４０Ｈ?ＡＲ０ ＰＯＲＴＷ ＡＲ０?＃８０００Ｈ ＳＴＭ ＃０Ｆ０Ｈ?ＡＲ０ ；设置第二显示区的行数 ＰＯＲＴＷ ＡＲ０?＃８０００Ｈ ＳＴＭ ＃００Ｈ?ＡＲ０ ；确定第三显示区的首地址 ＰＯＲＴＷ ＡＲ０?＃８０００Ｈ ＳＴＭ ＃８０Ｈ?ＡＲ０ ＰＯＲＴＷ ＡＲ０?＃８０００Ｈ </P> <P>ＳＴＭ ＃４ＣＨ?ＡＲ０ ；设置光标自动由左向右移动 ＰＯＲＴＷ ＡＲ０?＃８１００Ｈ</P> <P>ＳＴＭ ＃５ＢＨ?ＡＲ０ ；设置显示屏为两层叠加显示 方式 ＰＯＲＴＷ ＡＲ０?＃８１００Ｈ ＳＴＭ ＃０ＤＨ?ＡＲ０ ＰＯＲＴＷ ＡＲ０?＃８０００Ｈ</P> <P>…………</P> <P>ＳＴＭ ＃４２Ｈ?ＡＲ０ ；液晶显示屏显缓写指令 ＰＯＲＴＷ ＡＲ０?＃８１００Ｈ ＬＤ ＃２４０Ｄ?Ａ ；清屏程序 ＬＯＯＰ１： ＬＤ ＃４０Ｄ?Ｂ ＬＯＯＰ２： ＳＴＭ ＃００Ｈ?ＡＲ０ ＰＯＲＴＷ ＡＲ０?＃８０００Ｈ ＳＵＢ ＃１Ｈ?Ｂ ＢＣ ＬＯＯＰ２?ＢＮＥＱ ＳＵＢ ＃１Ｈ?Ａ ＢＣ ＬＯＯＰ１?ＡＮＥＱ ＲＥＴ ；初始化结束 显示图片的主程序如下： ＭＡＩＮ： ＳＴＭ ＃８００Ｈ?ＳＰ ＣＡＬＬ ＩＮＩＴ ；调用液晶显示屏初始化程序 ＳＴＭ ＃０Ｃ０３ＥＨ?ＡＲ１ ；位图数据相对于ＢＭＰ文 件头的地址 ＳＴＭ ＃４２Ｈ?ＡＲ０ ＰＯＲＴＷ ＡＲ０?＃８１００Ｈ ；送液晶显示屏显缓写指令 ＬＤ ＃２４０?Ａ ＣＭＰ： ＬＤ ＃４０?Ｂ ＣＭＰ１： ＰＯＲＴＷ ＡＲ１＋?＃８０００Ｈ；将３２０×２４０的位图数据 依次写入缓存区 ＳＵＢ ＃１?Ｂ ＢＣ ＣＭＰ１?ＢＮＥＱ ＳＵＢ ＃１?Ａ ＢＣ ＣＭＰ?ＡＮＥＱ Ｂ ＄ ；主程序结束</P> <P>以上就是该系统的软件设计。由于篇幅有限，这里省略了某些控制指令的设置，用户可根据实际需要添加设置。在实际的软件设计中，ＤＳＰ汇编语言执行过程中由于本身延时而引起的数据丢失现象，可以适当地加入空指令(ＮＯＰ)来解决。同时，本程序中使用图片显示的例子只是用来说明控制器的使用方法。对于文本方式的显示，这种方法在存储空间的利用方面就显得有些浪费而且灵活性较差。针对那些存储空间有限、效率要求高的系统，可以制作成字模存储在外部ＲＯＭ中供多次调 用，当显示文字时只需计算出显示的地址而后调用字模入口地址即可。</P> <P>本文提出的基于ＤＳＰ控制的液晶显示屏，作为示波表显示前端已在实际应用中取得了成功。该系统中所选用具有６４Ｋ大容量缓存区的ＳＥＤ１３３５控制器，适用于多种点阵规格的显示屏使用，加之其内部固化的字符发生器可产生１６０种字模，以及具有通过改变指令参数可实现图像的闪烁、翻转、移动等特点，因此从总体性能方面而言其大大强于同类型的其它控制器，非常适用于各种便携式系统显示前端的设计。 </P></td></tr></table> </div> <div id="comment_150856" class="cm"> </div> <div id="post_rate_div_150856"></div> </div> </div> </td></tr> <tr><td 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