上圖的代碼
#include<reg52.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";
//待滾動顯示的信息段落，每行不超過80個字符，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."
};
//顯示緩沖（2行）
uchar Disp_Buffer[32];
void V_Scroll_Display() //垂直滾動顯示
{
uchar i,j,k=0;
uchar *p=Msg[0];
uchar *q=Msg[Line_Count]+strlen(Msg[Line_Count]);
//以下僅使用顯示緩沖的前16字節空間
while(p<q)
{
for(i=0;i<16&&p<q;i++)
{ //消除顯示緩沖中待顯示行首尾可能出現的空格
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個字符時空格補充
for(j=i;j<16;j++) Disp_Buffer[j]=' ';
//垂直滾動顯示
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," ");
}
void H_Scroll_Display()//水平滾動顯示
{
uchar i,j,k=0,L=0;
uchar *p=Msg[0];
uchar *q=Msg[Line_Count]+strlen(Msg[Line_Count]);
//將32個字符的顯示緩沖前16個字符設為空格
for(i=0;i<16;i++) Disp_Buffer[i]=' ';
while(p<q)
{
//忽略緩沖中首尾可能出現的空格
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個字符時空格補充
for(j=i;j<32;j++) Disp_Buffer[j]=' ';
//水平滾動顯示
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; //行號在0，1間交替
DelayMS(300);
}
//如果顯示結束時停留在第0行，則清除第1行的內容
if(L==1) ShowString(0,1," ");
}
void EX_INT0() interrupt 0//外部中斷0，由K3控制暫停與繼續顯示
{
F0=!F0; //暫停與繼續顯示控制標志位
}
void main()
{
uint Count=0;
IE=0x81; //允許外部中斷0
IT0=1; //下降沿觸發
F0=0; //暫停與繼續顯示控制標志位
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);
}
}
} |
