单片机上电时，闹钟就响，若按停止键后，再设置新闹钟时间闹铃却不响，我是菜鸟，希望各位高手不吝赐教！程序在下面
#include<reg52.h>
#define uint unsigned int
#define uchar unsigned char
sbit dula=P2^6;//定义段和位选
sbit wela=P2^7;
sbit lcdrs=P1^0;
sbit lcdrw=P1^1;
sbit lcden=P2^5;//定义液晶使能
sbit s1=P3^4;//功能键
sbit s2=P3^5;//增加键
sbit s3=P3^6;//减小键
sbit s4=P3^7;//闹钟查看键
sbit beep=P2^3; //蜂鸣器
sbit dscs=P1^4;
sbit dsas=P1^5;
sbit dsrw=P1^6;
sbit dsds=P1^7;
sbit dsirq=P3^3;
sbit DENG=P1^2;
uchar m1=0,m2=0,m3=0,m4=0;
bit flag1,flag_ri;//定义两个位变量
uchar count,s1num,flag,t0_num; //定义其他变量
char miao,shi,fen,year,month,day,week,amiao,afen,ashi;
uchar code table[]=" 20 - - SUN ";//液晶固定显示内容
uchar code table1[]=" : : ";
void write_ds(uchar,uchar); //函数申明
void set_alarm(uchar,uchar,uchar);
void read_alarm();
uchar read_ds(uchar);
void set_time();
/********************子函数区********************************/
void delay(uchar z) //延时
{
uchar x,y;
for(x=z;x>0;x--)
for(y=110;y>0;y--);
}
void di()//蜂鸣器
{
beep=0;
delay(100);
beep=1;
}
void write_com(uchar com) //液晶写命令
{
lcdrs=0;//rs=0写命令
P0=com;
delay(5);
lcden=1;
delay(5);
lcden=0;
}
void write_date(uchar date)//液晶写数据
{
lcdrs=1; //rs=1写数据
P0=date;
delay(5);
lcden=1;
delay(5);
lcden=0;
}
void init()
{
uchar num;
EA=1;//开总中断
EX1=1;//开外部中断
IT1=1;//设置下降沿触发中断
flag1=0; //变量初始化
t0_num=0;
s1num=0;
week=1;
dula=0;
wela=0;
lcden=0;
lcdrw=0;
write_ds(0x0a,0x20);//打开振荡器
write_ds(0x0b,0x26);//设置24小时模式，数据二进制格式，开启闹铃中断
set_time();//设置上电默认时间,调试的时候用
write_com(0x38);//设置显示模式
write_com(0x0c);//设置开显示，不显示光标
write_com(0x06);//设置写一个字符地址加1
write_com(0x01);//显示清零，数据指针清零
write_com(0x80);//数据指针初始化
for(num=0;num<16;num++)
{
write_date(table[num]);
delay(5);
}
write_com(0x80+0x40);
for(num=0;num<12;num++)
{
write_date(table1[num]);
delay(5);
}
}
void write_sfm(uchar add,char date)//1602刷新时分秒
{
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,uchar date)//显示年月日
{
char shi,ge;
shi=date/10;
ge=date%10;
write_com(0x80+0x00+add);
write_date(0x30+shi);
write_date(0x30+ge);
}
void write_week(char we)//写星期
{
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('T');
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)
{
if((s1==0)||(s2==0)||(s3==0)||(s4==0))//取消闹钟报警，按任意键取消报警
{
delay(5); //延时去抖
if((s1==0)||(s2==0)||(s3==0)||(s4==0))
{
while(!(s1&&s2&&s3&&s4));//等待按键释放
di();
flag_ri=0;//清除报警标志
// dsirq=1;
}
}
}
if(s1==0)
{
delay(5);
if(s1==0)
{
while(!s1);//等待释放按键
s1num++;
di();
if(flag1==1) //设置闹铃为1时才对s1num调整，只调秒，分，时
{
if(s1num==4)
s1num=1;
}
flag=1; //在调整时间时标志位flag为1，不进行正常操作
switch(s1num)
{
case 1:
write_com(0x80+0x40+10);
write_com(0x0f);//光标闪烁//光标跳转到miao位
break;
case 2:
write_com(0x80+0x40+7);//光标跳转到fen位
break;
case 3:
write_com(0x80+0x40+4);//光标跳转到时位
break;
case 4:
write_com(0x80+0x00+12);//光标跳转到星期
break;
case 5:
write_com(0x80+0x00+9);//光标跳转到天
break;
case 6:
write_com(0x80+0x00+6);//光标跳转到月
break;
case 7:
write_com(0x80+0x00+3);//光标跳转到年
break;
case 8:
s1num=0;
write_com(0x0c);//恢复显示
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)
{
if(s2==0)
{
delay(10);
if(s2==0)
{
while(!s2);
di();
switch(s1num)
{
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+0x00+12);
break;
case 5:
day++;
if(day==32)
day=1;
write_nyr(9,day);
write_com(0x80+0x00+9);
break;
case 6:
month++;
if(month==13)
month=1;
write_nyr(6,month);
write_com(0x80+0x00+0x06);
break;
case 7:
year++;
if(year==100)
year=0;
write_nyr(3,year);
write_com(0x80+0x00+3);
break;
}
}
}
if(s3==0)
{
delay(5);
if(s3==0)
{
while(!s3);
di();
switch(s1num)
{
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+0x00+12);
break;
case 5:
day--;
if(day==0)
day=31;
write_nyr(9,day);
write_com(0x80+0x00+9);
break;
case 6:
month--;
if(month==0)
month=12;
write_nyr(6,month);
write_com(0x80+0x00+6);
break;
case 7:
year--;
if(year==-1)
year=99;
write_nyr(3,year);
write_com(0x80+0x00+3);
break;
}
}
}
if(s4==0)
{
delay(5);
if(s4==0)
{
flag1=~flag1;
while(!s4);
di();
if(flag1==0)
{
// 退出闹钟设置
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);
DENG=0;
}
else
{
read_alarm();//读取原始数据
miao=amiao;//重新赋值用以按键调节
fen=afen;
shi=ashi;
write_com(0x80+0x40);
write_date('R');
write_date('i');
write_com(0x80+0x40+3);
write_sfm(4,ashi);
write_sfm(7,afen);
write_sfm(10,amiao);
}
}
}
}
}
void write_ds(uchar add,uchar date)//写12c887函数
{
dscs=0;
dsas=1;
dsds=1;
dsrw=1;
P0=add;
dsas=0;//先写地址
dsrw=0;
P0=date;//再写数据
dsrw=1;
dsas=1;
dscs=1;
}
uchar read_ds(uchar add)//读12c887函数
{
uchar ds_date;
dsas=1;
dsds=1;
dsrw=1;
dscs=0;
P0=add;//先写地址
dsas=0;
dsds=0;
P0=0xff;
ds_date=P0;//再写数据
dsds=1;
dsas=1;
dscs=1;
return ds_date;
}
void set_time() //初始化
{
write_ds(0,0); //秒 kkkkk
write_ds(1,0); //秒闹铃
write_ds(2,3); //分钟
write_ds(3,4); //分钟闹铃
write_ds(4,0); //小时
write_ds(5,0); //小时闹铃
write_ds(6,0); //星期
write_ds(7,1); //日
write_ds(8,1); //月
write_ds(9,12); //年
}
void read_alarm()
{
amiao=read_ds(1);
afen=read_ds(3);
ashi=read_ds(5);
}
void main()
{
init();
while(1)
{
keyscan();
if(flag_ri==1)
{
di();
delay(100);
di();
delay(500);
}
if(flag==0&&flag1==0)//正常工作时
{
keyscan(); //按键扫描
year=read_ds(9);//读取12C887数据
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
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 //外部中断1服务程序
{
uchar c;
flag_ri=1;
c=read_ds(0xc0);//读取12c887的c寄存器表示响应中断
}
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