带中文字库液晶屏LG256641驱动

//--------------------------------------------------
//主程序
//--------------------------------------------------
void main(void)
{
//单片机初始化
init_st7920();
delayms(20);
dishz(1,3,第一行空二格);
dishz(2,5,第二行);
dishz(3,7,第三行);
dishz(4,9,第四行);
   while(1);
}
//*******************************************************************
//-------------------------------------------------------------------
//lg256641测试程序：st7920p.c
//驱动芯片st7920，使用并行通信格式
//-------------------------------------------------------------------
//*******************************************************************
#include
sbit e1=p2^2;  //13
sbit e2=p2^3;  //14
sbit rs=p2^4;  //15
sbit rw=p2^5;  //16
//-------------------------------------------------------------------
//延时子程序
//-------------------------------------------------------------------
void delayus(int us)
{
unsigned int i;
for(i=0;i
void delayms(int ms)
{
unsigned int i;
for(i=0;i
//-------------------------------------------------------------------
//读指令
//-------------------------------------------------------------------
unsigned char readcmd(unsigned char band)
{
unsigned char tmp;
   rs = 0;
   rw = 1;
p0=0xff;
   if(band==1)e1= 1;
   if(band==2)e2= 1;
   delayus(1);                    //延时根据时序图的要求及所采用的晶振来确定
   tmp=p0;
   e1 = 0;
   e2 = 0;
return tmp;
}
//-------------------------------------------------------------------
//忙检测
//-------------------------------------------------------------------
void busy(unsigned char band)
{
while(readcmd(band)&0x80);
}
//-------------------------------------------------------------------
//写指令
//-------------------------------------------------------------------
void writecmd(unsigned char band,unsigned char cmd)
{
   busy(band);
   rs = 0;
   rw = 0;
   if(band==1)e1= 1;
   if(band==2)e2= 1;
   p0 = cmd;
   delayus(1);                    //延时根据时序图的要求及所采用的晶振来确定
   e1 = 0;
   e2 = 0;
}
//-------------------------------------------------------------------
//写数据
//-------------------------------------------------------------------
void writedat(unsigned char band,unsigned char dat)
{
   busy(band);
   rs = 1;
   rw = 0;
   if(band==1)e1= 1;
   if(band==2)e2= 1;
   p0 = dat;
   delayus(1);                    //延时根据时序图的要求及所采用的晶振来确定
   e1 = 0;
   e2 = 0;
}
//-------------------------------------------------------------------
//显示汉字
//x表示行号，y表示列号，*s表示字符串。
//注意字符串中相邻的字母或数字出现奇数时，以空格补齐偶数
//-------------------------------------------------------------------
void dishz(unsigned char x,unsigned char y,unsigned char *s)
{
  unsigned char ch;
if(y>0)y--;
if(x
//-------------------------------------------------------------------
//st7920初始化
//-------------------------------------------------------------------
void init_st7920(void)
{
e1=0;
e2=0;
writecmd(1,0x30);  
writecmd(2,0x30);  
writecmd(1,0x0c);  
writecmd(2,0x0c);  
writecmd(1,0x01);  
writecmd(2,0x01);
busy(1);
busy(2);  
}
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原文地址： Http://blog.gkong.com/more.asp?id=118422&Name=zhouchs