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我查了一下，說這是沒有初始化，才會在第一行出現黑格，需要初始化時延遲增大，我調了之后還是這樣。。
沒調過的代碼如下：#include<reg52.h>#define uchar unsigned char
#define uint unsigned int
sbit dula=P2^6;
sbit wela=P2^7;
sbit rs=P3^5;
sbit lcden=P3^4;
sbit s1=P3^0;//功能鍵
sbit s2=P3^1;//增加鍵
sbit s3=P3^2;//減小鍵
sbit s4=P3^6;//鬧鐘查看鍵
sbit rd=P3^7;
sbit beep=P2^3;//蜂鳴器
sbit dscs=P1^4;
sbit dsas=P1^5;
sbit dsrw=P1^6;
sbit dsds=P1^7;
sbit dsirq=P3^3;
bit flag1,flag_ri;//定義兩個位變量
uchar count,s1num,flag,t0_num;//其它變量定義
char miao,shi,fen,year,month,day,week,amiao,afen,ashi;
uchar code table[]=" 20 - - ";//液晶固定顯示內容
uchar code table1[]=" : : ";
void write_ds(uchar,uchar);//函數申明
void set_alarm(uchar,uchar,uchar);void read_alarm();
uchar read_ds(uchar);void set_time();
void delay(uint z)//延時函數
{
uint x,y;
for(x=z;x>0;x--)
for(y=110;y>0;y--);
}
void di() //蜂鳴器報警聲音
{
beep=0;
delay(100);
beep=1;
}
void write_com(uchar com)
{//寫液晶命令函數
rs=0;
lcden=0;
P0=com;
delay(3);
lcden=1;
delay(3);
lcden=0;
}
void write_date(uchar date)
{//寫液晶數據函數
rs=1;
lcden=0;
P0=date;
delay(3);
lcden=1;
delay(3);
lcden=0;
}
void init()
{//初始化函數
uchar num;
EA=1;//打開總中斷
EX1=1;//開外部中斷1
IT1=1;//設置負跳變沿觸發(fā)中斷
flag1=0;//變量初始化
t0_num=0;
s1num=0;
week=1;
dula=0;//關閉數碼管顯示
wela=0;
lcden=0;
rd=0;
//-----------------------------------------------------
write_com(0x38);//1602液晶初始化
write_com(0x0c);
write_com(0x06);
write_com(0x01);
write_com(0x80);
for(num=0;num<15;num++)//寫入液晶固定部分顯示
{
write_date(table[num]);
delay(1);
}
write_com(0x80+0x40);
for(num=0;num<11;num++)
{
write_date(table1[num]);
delay(1);
}
}
void write_sfm(uchar add,char date)
{//1602液晶刷新時分秒函數4為時，7為分，10為秒
char shi,ge;
shi=date/10;
ge=date%10;
write_com(0x80+0x40+add);
write_date(0x30+shi);
write_date(0x30+ge);
}
void write_nyr(uchar add,char date)
{//1602液晶刷新年月日函數3為年，6為分，9為秒
char shi,ge;
shi=date/10;
ge=date%10;
write_com(0x80+add);
write_date(0x30+shi);
write_date(0x30+ge);
}
void write_week(char we)
{//寫液晶星期顯示函數
write_com(0x80+12);
switch(we)
{
case 1: write_date('M');delay(5);
write_date('O');delay(5);
write_date('N');
break;
case 2: write_date('T');delay(5);
write_date('U');delay(5);
write_date('E');
break;
case 3: write_date('W');delay(5);
write_date('E');delay(5);
write_date('D');
break;
case 4: write_date('T');delay(5);
write_date('H');delay(5);
write_date('U');
break;
case 5: write_date('F');delay(5);
write_date('R');delay(5);
write_date('I');
break;
case 6: write_date('S');delay(5);
write_date('A');delay(5);
write_date('T');
break;
case 7: write_date('S');delay(5);
write_date('U');delay(5);
write_date('N');
break;
}
}
void keyscan()
{
if(flag_ri==1)
{//這里用來取消鬧鐘報警，任一鍵取消報警
if((s1==0)||(s2==0)||(s3==0)||(s4==0))
{
delay(5);
if((s1==0)||(s2==0)||(s3==0)||(s4==0))
{
while(!(s1&&s2&&s3&&s4));
di();
flag_ri=0;//清除報警標志
}
}
}
if(s1==0)//檢測S1
{
delay(5);
if(s1==0)
{
s1num++;//記錄按下次數
if(flag1==1)
if(s1num==4)
s1num=1;
flag=1;
while(!s1);di();
switch(s1num)
{//光標閃爍點定位
case 1: write_com(0x80+0x40+10);
write_com(0x0f);
break;
case 2: write_com(0x80+0x40+7);
break;
case 3: write_com(0x80+0x40+4);
break;
case 4: write_com(0x80+12);
break;
case 5: write_com(0x80+9);
break;
case 6: write_com(0x80+6);
break;
case 7: write_com(0x80+3);
break;
case 8: s1num=0;
write_com(0x0c);
flag=0;
write_ds(0,miao);
write_ds(2,fen);
write_ds(4,shi);
write_ds(6,week);
write_ds(7,day);
write_ds(8,month);
write_ds(9,year);
break;
}
}
}
if(s1num!=0)//只有當S1按下后，才檢測S2和S3
{
if(s2==0)
{
delay(1);
if(s2==0)
{
while(!s2);di();
switch(s1num)
{//根據功能鍵次數調節(jié)相應數值
case 1: miao++;
if(miao==60)
miao=0;
write_sfm(10,miao);
write_com(0x80+0x40+10);
break;
case 2: fen++;
if(fen==60)
fen=0;
write_sfm(7,fen);
write_com(0x80+0x40+7);
break;
case 3: shi++;
if(shi==24)
shi=0;
write_sfm(4,shi);
write_com(0x80+0x40+4);
break;
case 4: week++;
if(week==8)
week=1;
write_week(week);
write_com(0x80+12);
break;
case 5: day++;
if(day==32)
day=1;
write_nyr(9,day);
write_com(0x80+9);
break;
case 6: month++;
if(month==13)
month=1;
write_nyr(6,month);
write_com(0x80+6);
break;
case 7: year++;
if(year==100)
year=0;
write_nyr(3,year);
write_com(0x80+3);
break;
}
}
}
if(s3==0)
{
delay(1);
if(s3==0)
{
while(!s3);di();
switch(s1num)
{//根據功能鍵次數調節(jié)相應數值
case 1: miao--;
if(miao==-1)
miao=59;
write_sfm(10,miao);
write_com(0x80+0x40+10);
break;
case 2: fen--;
if(fen==-1)
fen=59;
write_sfm(7,fen);
write_com(0x80+0x40+7);
break;
case 3: shi--;
if(shi==-1)
shi=23;
write_sfm(4,shi);
write_com(0x80+0x40+4);
break;
case 4: week--;
if(week==0)
week=7;
write_week(week);
write_com(0x80+12);
break;
case 5: day--;
if(day==0)
day=31;
write_nyr(9,day);
write_com(0x80+9);
break;
case 6: month--;
if(month==0)
month=12;
write_nyr(6,month);
write_com(0x80+6);
break;
case 7: year--;
if(year==-1)
year=99;
write_nyr(3,year);
write_com(0x80+3);
break;
}
}
}
}
if(s4==0)//檢測S4
{
delay(5);
if(s4==0)
{
flag1=~flag1;
while(!s4);di();
if(flag1==0)
{//退出鬧鐘設置時保存數值
flag=0;
write_com(0x80+0x40);
write_date(' ');
write_date(' ');
write_com(0x0c);
write_ds(1,miao);
write_ds(3,fen);
write_ds(5,shi);
}
else
{//進入鬧鐘設置
read_alarm();//讀取原始數據
miao=amiao;//重新賦值用以按鍵調節(jié)
fen=afen;
shi=ashi;
write_com(0x80+0x40);
write_date('R');//顯示標志
write_date('i');
write_com(0x80+0x40+3);
write_sfm(4,ashi);//送液晶顯示鬧鐘時間
write_sfm(7,afen);
write_sfm(10,amiao);
}
}
}
}
void write_ds(uchar add,uchar date)
{//寫12C887函數
dscs=0;
dsas=1;
dsds=1;
dsrw=1;
P0=add;//先寫地址
dsas=0;
dsrw=0;
P0=date;//再寫數據
dsrw=1;
dsas=1;
dscs=1;
}
uchar read_ds(uchar add)
{//讀12C887函數
uchar ds_date;
dsas=1;
dsds=1;
dsrw=1;
dscs=0;
P0=add;//先寫地址
dsas=0;
dsds=0;
P0=0xff;
ds_date=P0;//再讀數據
dsds=1;
dsas=1;
dscs=1;
return ds_date;
}
/*---首次操作12C887時給予寄存器初始化---*/
void set_time()
{//首次上電初始化時間函數
write_ds(4, 0);
write_ds(2, 0);
/*write_ds(0,0);
write_ds(1,0);
write_ds(2,0);
write_ds(3,0);
write_ds(4,0);
write_ds(5,0);
write_ds(6,0);
write_ds(7,0);
write_ds(8,0);
write_ds(9,0); */
}
//----------------------------------------
void read_alarm()
{//讀取12C887鬧鐘值
amiao=read_ds(1);
afen=read_ds(3);
ashi=read_ds(5);
}
void main()//主函數
{
init();//調用初始化函數
while(1)
{
keyscan();//按鍵掃描
if(flag_ri==1)//當鬧鐘中斷時進入這里
{
di();
delay(100);
di();
delay(500);
}
if(flag==0&&flag1==0)//正常工作時進入這里
{
keyscan();//按鍵掃描
year=read_ds(9);//讀取12C887數據
month=read_ds(8);
day=read_ds(7);
week=read_ds(6);
shi=read_ds(4);
fen=read_ds(2);
miao=read_ds(0);
write_sfm(10,miao);//送液晶顯示
write_sfm(7,fen);
write_sfm(4,shi);
write_week(week);
write_nyr(3,year);
write_nyr(6,month);
write_nyr(9,day);
}
}
}
void exter() interrupt 2//外部中斷1服務程序
{ uchar c; //進入中斷表示鬧鐘時間到，
flag_ri=1; //設置標志位，用以大程序中報警提示
c=read_ds(0x0c);//讀取12C887的C寄存器表示響應了中斷
}
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