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我在蜂鳴器兩端接了二極管，二極管是按照程序閃的，蜂鳴器一直響，我往蜂鳴器里燒過開發(fā)板的程序，蜂鳴器沒有問題。求大佬指點(diǎn)，下面是部分程序。
- #include<reg51.h>//51單片機(jī)頭文件
- #define LCD1602_DATAPINS P0
- typedef unsigned char uchar;
- typedef unsigned int uint;
- sbit K1=P3^2;//比賽倒計(jì)時(shí)開始/暫停
- sbit K2=P3^3;//24s倒計(jì)時(shí)重新開始
- sbit K3=P1^3;//乙隊(duì)+1按鍵
- sbit K4=P1^2;//乙隊(duì)-1按鍵
- sbit K5=P1^1;//甲隊(duì)+1按鍵
- sbit K6=P1^0;//甲隊(duì)-1按鍵
- sbit K7=P1^4;//分+1按鍵
- sbit K8=P1^5;//秒+1按鍵
- sbit K9=P1^6;//分-1
- sbit K10=P1^7;//秒-1
- sbit beep=P2^0;//蜂鳴器接口
- sbit RS=P2^6;
- sbit RW=P2^5;//OO
- sbit E=P2^7;
- char miao,fen,num,time,aa;
- int m=0;
- uchar bb,cc,i;
- uchar code table1[]={"H.T 000:000 Y.T "};
- uchar code table2[]={"12:00 ------- 24"};
- //延時(shí)子函數(shù)
- void delay(uint z)
- {
- uint x;
- uchar y;
- for(x=z;x>0;x--)
- for(y=110;y>0;y--);
- }
- //LCD1602液晶初始化子函數(shù)
- void LCD1602_init()
- {
- uchar i;
- bb=0; //H.T分?jǐn)?shù)初始化
- cc=0; //R.T分?jǐn)?shù)初始化
- time=0;
- TMOD=0x10; //定時(shí)器1初始化
- TL1=0x00;
- TH1=0x4c;
- EA=1; //開總中斷
- ET1=1; //開定時(shí)器1
- TR1=0; //定時(shí)器1不工作
- EX0=1; //開中斷0
- EX1=1; //開中斷1
- IT0=1; //中斷0為邊沿觸發(fā)
- IT1=1; //中斷1為邊沿觸發(fā)
- E=0;
- beep=0;
- miao=0;
- fen=12;
- aa=24;
- write_com(0x38); //LCD設(shè)置初始化
- write_com(0x0c);
- write_com(0x06);
- write_com(0x01);
- write_com(0x80); //LCD顯示初始化
- for(i=0;i<16;i++)
- {
- write_date(table1[i]);
- }
- write_com(0x80+0x40);
- for(i=0;i<16;i++)
- {
- write_date(table2[i]);
- }
- }
- void counter_down()
- {
- uchar i;
- if(time>=20) //每1s倒計(jì)時(shí)做減一操作
- {
- miao--;
- aa--;
- write_com(0x80+0x4e); //24s倒計(jì)時(shí)顯示
- write_date(0x30+aa/10);
- write_date(0x30+aa%10);
- write_com(0x80+0x4e);
- if(aa==0) //24s結(jié)束發(fā)出報(bào)警
- {TR1=~TR1;
- beep=1;
- delay(200);
- beep=0;
-
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