📄 5_自制单片机之五（1）……lcd1602的驱动_边学边秀单片机.htm
字号:
P1------DB0～DB7
P2.0------RS<BR>
P2.1------RW<BR>
P2.2------E<BR>*****************************************/<BR># define
LCD_DB
P1<BR>
sbit
LCD_RS=P2^0;<BR>
sbit
LCD_RW=P2^1;<BR>
sbit LCD_E=P2^2;</P>
<P>/******定义函数****************/</P>
<P># define uchar unsigned char<BR># define uint unsigned int<BR>void
LCD_init(void);//初始化函数<BR>void LCD_write_command(uchar
command);//写指令函数<BR>void LCD_write_data(uchar dat);//写数据函数<BR>void
LCD_disp_char(uchar x,uchar y,uchar
dat);//在某个屏幕位置上显示一个字符,X（0-16),y(1-2)<BR>//void
LCD_check_busy(void);//检查忙函数。我没用到此函数，因为通过率极低。<BR>void delay_n40us(uint
n);//延时函数<BR>//********************************<BR>//*******初始化函数***************<BR>void
LCD_init(void)<BR>{<BR>LCD_write_command(0x38);//设置8位格式，2行，5x7<BR>LCD_write_command(0x0c);//整体显示，关光标，不闪烁<BR>LCD_write_command(0x06);//设定输入方式，增量不移位<BR>LCD_write_command(0x01);//清除屏幕显示<BR>delay_n40us(100);//实践证明，我的LCD1602上，用for循环200次就能可靠完成清屏指令。<BR>}<BR>//********************************<BR>//********写指令函数************<BR>void
LCD_write_command(uchar
dat)<BR>{<BR>LCD_DB=dat;<BR>LCD_RS=0;//指令<BR>LCD_RW=0;//写入<BR>LCD_E=1;//允许<BR>LCD_E=0;<BR>delay_n40us(1);//实践证明，我的LCD1602上，用for循环1次就能完成普通写指令。<BR>}<BR>//*******************************<BR>//********写数据函数*************<BR>void
LCD_write_data(uchar
dat)<BR>{<BR>LCD_DB=dat;<BR>LCD_RS=1;//数据<BR>LCD_RW=0;//写入<BR>LCD_E=1;//允许<BR>LCD_E=0;<BR>delay_n40us(1);<BR>}<BR>//********************************<BR>//*******显示一个字符函数*********<BR>void
LCD_disp_char(uchar x,uchar y,uchar dat)<BR>{<BR>uchar
address;<BR>if(y==1)<BR>
address=0x80+x;<BR>else<BR>
address=0xc0+x;<BR>LCD_write_command(address);<BR>LCD_write_data(dat);<BR>}<BR>//********************************<BR>/*******检查忙函数*************<BR>void
LCD_check_busy()
//实践证明，在我的LCD1602上，检查忙指令通过率极低，以<BR>{
//至于不能正常使用LCD。因此我没有再用检查忙函数。而使<BR>do
//用了延时的方法，延时还是非常好用的。我试了一下，用<BR>
{
LCD_E=0;
//for循环作延时，普通指令只要1次循就可完成。清屏指令<BR>
LCD_RS=0;
//要用200次循环便能完成。 <BR>
LCD_RW=1;<BR>
LCD_DB=0xff;<BR>
LCD_E=1;<BR>
}while(LCD_DB^7==1);</P>
<P>｝<BR>******************************/<BR>//********延时函数***************<BR>void
delay_n40us(uint n)<BR>{ uint i;<BR> uchar
j; <BR>
for(i=n;i>0;i--)<BR>
for(j=0;j<2;j++);
//在这个延时循环函数中我只做了2次循环，<BR>}
//实践证明我的LCD1602上普通的指令只需1次循环就能可靠完成。<BR>//*******************************</P>
<P>//*********主函数*****************<BR>void
main(void)<BR>{<BR>
LCD_init();<BR>
LCD_disp_char(0,1,"A");<BR>
while(1);<BR>}</P>
<P>//*******************************</P>
<P>＜版面有长度限制，见下一期＞。。。</P>
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<TD class=cnt style="PADDING-LEFT: 20px"><SPAN class=date>2007-08-23 18:05
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