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/* 名称：LCD1602字符液晶滚动演示程序
说明：K1~K3按钮分别实现液晶垂直或水平滚动显示及暂停与继续控制。
*/
#include<reg51.h>
#include<string.h>
#define uchar unsigned char
#define uint unsigned int
void Initialize_LCD();
void DelayMS(uint ms);
void ShowString(uchar,uchar,uchar *);
sbit K1=P3^0;
sbit K2=P3^1;
sbit K3=P3^2;
uchar code Prompt[]="Press K1 - K3 To Start Demo Prog";
//待滚动显示的信息段落，每行不超过80个字符，共6行
uchar const Line_Count=6;
uchar code Msg[][80]=
{
"Many CAD users dismiss schematic capture as a necessary evil in the ",
"process of creating PCB layout but we have always disputed this point ",
"of view. With PCB layout now offering automation of both component ",
"can often be the most time consuming element of the exercise.",
"And if you use circuit simulation to develop your ideas, ",
"you are going to spend even more time working on the schematic."
};
//显示缓冲（2行）
uchar Disp_Buffer[32];
//垂直滚动显示
void V_Scroll_Display()
{
uchar i,j,k=0;
uchar *p=Msg[0];
uchar *q=Msg[Line_Count]+strlen(Msg[Line_Count]);
//以下仅使用显示缓冲的前16字节空间
while(p<q)
{
for(i=0;i<16&&p<q;i++)
{ //消除显示缓冲中待显示行首尾可能出现的空格
if((i==0||i==15)&&*p==' ') p++;
if(*p!='\0')
{
Disp_Buffer[i]=*p++;
}
else
{
if(++k>Line_Count) break;
p=Msg[k]; //p指向下一串的首地址
Disp_Buffer[i]=*p++;
}
}
//不足16个字符时空格补充
for(j=i;j<16;j++) Disp_Buffer[j]=' ';
//垂直滚动显示
while(F0) DelayMS(5);
ShowString(0,0," ");
DelayMS(150);
while(F0) DelayMS(5);
ShowString(0,1,Disp_Buffer);
DelayMS(150);
while(F0) DelayMS(5);
ShowString(0,0,Disp_Buffer);
ShowString(0,1," ");
DelayMS(150);
}
//最后清屏
ShowString(0,0," ");
ShowString(0,1," ");
}
//水平滚动显示
void H_Scroll_Display()
{
uchar i,j,k=0,L=0;
uchar *p=Msg[0];
uchar *q=Msg[Line_Count]+strlen(Msg[Line_Count]);
//将32个字符的显示缓冲前16个字符设为空格
for(i=0;i<16;i++) Disp_Buffer[i]=' ';
while(p<q)
{
//忽略缓冲中首尾可能出现的空格
if((i==16||i==31)&&*p==' ') p++;
for(i=16;i<32&&p<q;i++)
{
if(*p!='\0')
{
Disp_Buffer[i]=*p++;
}
else
{
if(++k>Line_Count) break;
p=Msg[k]; //p指向下一串的首地址
Disp_Buffer[i]=*p++;
}
}
//不足32个字符时空格补充
for(j=i;j<32;j++) Disp_Buffer[j]=' ';
//水平滚动显示
for(i=0;i<=16;i++)
{
while(F0) DelayMS(5);
ShowString(0,L,Disp_Buffer+i);
while(F0) DelayMS(5);
DelayMS(20);
}
L=(L==0)?1:0; //行号在0，1间交替
DelayMS(300);
}
//如果显示结束时停留在第0行，则清除第1行的内容
if(L==1) ShowString(0,1," ");
}
//外部中断0，由K3控制暂停与继续显示
void EX_INT0() interrupt 0
{
F0=!F0; //暂停与继续显示控制标志位
}
//主程序
void main()
{
uint Count=0;
IE=0x81; //允许外部中断0
IT0=1; //下降沿触发
F0=0; //暂停与继续显示控制标志位
Initialize_LCD();
ShowString(0,0,Prompt);
ShowString(0,1,Prompt+16);
while(1)
{
if(K1==0)
{
V_Scroll_Display();
DelayMS(300);
}
else
if(K2==0)
{
H_Scroll_Display();
DelayMS(300);
}
}
}
//LCD1602.c
/* 名称：液晶控制与显示程序
说明：本程序是通用的1602液晶控制程序。
*/
#include<reg51.h>
#include<intrins.h>
#define uchar unsigned char
#define uint unsigned int
sbit RS=P2^0;
sbit RW=P2^1;
sbit EN=P2^2;
//延时
void DelayMS(uint ms)
{
uchar i;
while(ms--) for(i=0;i<120;i++);
}
//忙检查
uchar Busy_Check()
{
uchar LCD_Status;
RS=0; //寄存器选择
RW=1; //读状态寄存器
EN=1; //开始读
DelayMS(1);
LCD_Status=P0;
EN=0;
return LCD_Status;
}
//写LCD命令
void Write_LCD_Command(uchar cmd)
{
while((Busy_Check()&0x80)==0x80); //忙等待
RS=0; //选择命令寄存器
RW=0; //写
EN=0;
P0=cmd;EN=1;DelayMS(1);EN=0;
}
//发送数据
void Write_LCD_Data(uchar dat)
{
while((Busy_Check()&0x80)==0x80); //忙等待
RS=1;RW=0;EN=0;P0=dat;EN=1;DelayMS(1);EN=0;
}
//LCD初始化
void Initialize_LCD()
{
Write_LCD_Command(0x38);DelayMS(1);
Write_LCD_Command(0x01);DelayMS(1); //清屏
Write_LCD_Command(0x06);DelayMS(1); //字符进入模式：屏幕不动，字符后移
Write_LCD_Command(0x0c);DelayMS(1); //显示开，光标关
}
//显示字符串
void ShowString(uchar x,uchar y,uchar *str)
{
uchar i=0;
if(y==0) Write_LCD_Command(0x80|x); //设置显示起始位置
if(y==1) Write_LCD_Command(0xc0|x);
for(i=0;i<16;i++) //输出字符串
{
Write_LCD_Data(str[i]);
}
}
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