DDRAM is the Display Data RAM for these modules which represents the hexadecimal Display data adresses。 See below:
至此，我们已经知道了足够的信息，现在我们可以编写代码让我们的LCD活动起来了。在我的程序里，有三个非常重要的函数：Prepare_LCD｜move_to_specific｜button_Write_to_Screen_Click。 下面的代码是Prepare_LCD函数： private void Prepare_LCD(int cursor_status) {/* Look at the instruction table to make these comments make sense */ /* Thread。Sleep() function is not needed for some type of LCD instructions * and also this is changeable from an LCD * to another so tryout the best for your module */ /* Sends 12(d) = 1100 binary to open the entire display and * makes a delay that LCD needs for execution */ if(cursor_status == 0)PortAccess。Output(data， 12); //Thread。Sleep(1); //The delays can be smaller， Check Busy Flag info in the article /* Sends 14(d) = 1110 binary to open the entire display * and makes the cursor active and also * makes a delay that LCD needs for execution */ if(cursor_status == 1)PortAccess。Output(data， 14); //Thread。Sleep(1); //The delays can be smaller， Check Busy Flag info in the article /* Sends 15(d) = 1111 binary to open the entire display， makes * the cursor active and blink and also * makes a delay that LCD needs for execution */ if(cursor_status == 2)PortAccess。Output(data， 15); //Thread。Sleep(1); //The delays can be smaller， Check Busy Flag info in the article /* Makes the enable pin high and register pin low */PortAccess。Output(control， 8); Thread。Sleep(1); //The delays can be smaller， Check Busy Flag info in the article /* Makes the enable pin low for LCD to read its * data pins and also register pin low */PortAccess。Output(control， 9); Thread。Sleep(1); //The delays can be smaller， Check Busy Flag info in the article /* Clears entire display and sets DDRAM address * 0 in address counter */PortAccess。Output(data， 1); //Thread。Sleep(1); //The delays can be smaller， Check Busy Flag info in the article /* Makes the enable pin high and register pin low */PortAccess。Output(control， 8); Thread。Sleep(1); //The delays can be smaller， Check Busy Flag info in the article /* Makes the enable pin low for LCD to read its * data pins and also register pin low */PortAccess。Output(control， 9); Thread。Sleep(1); //The delays can be smaller， Check Busy Flag info in the article /* We are setting the interface data length to 8 bits * with selecting 2-line display and 5 x 7-dot character font。 * Lets turn the display on so we have to send */PortAccess。Output(data， 56); //Thread。Sleep(1); //The delays can be smaller， Check Busy Flag info in the article /* Makes the enable pin high and register pin low */PortAccess。Output(control， 8); Thread。Sleep(1); //The delays can be smaller， Check Busy Flag info in the article /* Makes the enable pin low for LCD to read its * data pins and also register pin low */PortAccess。Output(control， 9); Thread。Sleep(1); //The delays can be smaller， Check Busy Flag info in the article }
move_to_specific函数可以移动光标到屏幕上任何位置： private void move_to_specific(int line， int column) { /* Makes the RS pin low */PortAccess。Output(control， 8); //Thread。Sleep(1); if(line == 1) { /* Sets RAM address so that the cursor is positioned * at a specific column of the 1st line。 */ PortAccess。Output(data， 127+column); //Thread。Sleep(1); } if(line == 2) { /* Sets RAM address so that the cursor * is positioned at a specific column of the 2nd line。 */ PortAccess。Output(data， 191+column); //Thread。Sleep(1); }}
看下面的Ascii码和二进制码转换表，你可以明白button_Write_to_screen_Click函数的作用：
现在你可以看看这个函数到底是如何实现的，我不打算把代码放在这里，因为我不想让我的这篇文章难于阅读。 注意：如果LCD执行的时间非常快，你可以激活Thread。Sleep函数。 写在最后有人可能要问“我自己编写程序控制LCD有什么好处？”其实这完全是个人爱好，但如果想象一下，我们用自己编写的LCD显示从网络上获取的CodeProject的新闻，那是多么美妙的事情。 关于译者Aweay是学生。他目前大四，对基于组件技术的软件设计有深入研究。任CSDN C++Builder板块版主，可以通过 siney@yeah。net 与他联系，同时欢迎你访问他的网站 http://siney。yeah。net。
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