這是論壇一個大師的程序我仿制后只能計數255就歸零了怎么回事,勞煩各位老師看下程序哪兒要改,謝謝!
- #include <reg51.h>
- sbit key0=P1^0;
- sbit key1=P1^1; //定義key0，key1接口
- unsigned char flag,con,mcount; //flag為計數到一秒時給時鐘發的信號
- unsigned char count = 0;
- unsigned char seccount =0; //作為時鐘的秒的計量單位
- unsigned char hour = 0; //時鐘的時
- unsigned char min = 0; //時鐘的分
- unsigned char sec = 0; //時鐘的秒
- unsigned char keypress0,keypress1,mode,ms,s,ss,start;
- unsigned char
- Displaynum[]={0x14,0xd7,0x4c,0x45,0x87,0x25,0x24,0x57,0x04,0x05, 0x10,0xd3,0x48,0x41,0x83,0x21,0x20,0x53,0x00,0x01,0xff,0xfb};
- //數碼管十六進制譯碼表
- unsigned char controlnum[]={0x08,0x04,0x02,0x01}; //控制四個數碼管顯示
- unsigned char DisplayBuff[]={0x00, 0x00, 0x00, 0x00}; //每個數碼管的值
- void display_state(); //數碼管顯示子程序
- void keyscan(); //鍵盤掃描子程序
- void timer(); //秒表子程序
- unsigned char count1,flag1,t_adjust=0,tm_adjust=0;
- unsigned char bKey0Pressed = 0, bKey1Pressed = 0;
- unsigned char ucStatus = 0;
- void main()
- {
- TMOD = 0x01; //定時器0工作在模式1，GATE=0，C/t=0,16位模
- TH0= (2^16-5000)/256;//定時器0 預存值，
- TL0= (2^16-5000)%256;
- TR0= 1; //定時器0 啟動
- ET0= 1; //定時器中斷0 允許
- EA= 1; //開中斷
- IT0=1; //外部中斷0下降沿觸發
- IT1=1; //外部中斷1 下降沿觸發
- EX0=1; //外部中斷0允許
- EX1=1; //外部中斷1允許
- PX1=1; //外部中斷1 為高優先級中斷
- while(1) //死循環，
- {
- if(flag == 1) //時鐘顯示
- {
- flag = 0;
- sec++;
- if(sec ==60)
- {sec = 0;
- min++;
- if(min ==60)
- {min = 0;
- hour ++;
- if(hour == 24)
- {
- hour = 0;
- }
- }
- }
- }
- display_state();
- keyscan();
- timer();
- }
- }
- //////////////////////////////////ISR中斷服務程序，每5ms產生一個定時器0 中斷
- void Display() interrupt 1
- {
- TH0 = (2^16-5000)/256;
- TL0 = (2^16-5000)%256;
- seccount ++;
- mcount ++;
- keypress0++;
- keypress1++;
- P2=0x00; //P2口先清零
- P0 = Displaynum[DisplayBuff[count]]; //P0口輸出
- P2 = controlnum[count]; //P2口輸出
- count++;
- if(count==4)
- count=0;
- if(seccount == 200) //200*5ms=1s
- { seccount =0;
- flag =1; //每過1秒給時鐘信號加一秒
- }
- }
- ///////////////////////////////////////////
- void display_state()
- {
- if(mode == 0) //時鐘模式，顯示時間
- {
- DisplayBuff[0] = hour/10;
- DisplayBuff[1] = (hour%10)+10; //"+10"是為了顯示加點的數字
- DisplayBuff[2] = min/10;
- DisplayBuff[3] = min%10;
- }
- if(mode == 1) //秒表模式，顯示秒表
- {
- DisplayBuff[0] = ss +10; //"+10"是為了顯示加點的數字
- DisplayBuff[1] = s/10;
- DisplayBuff[2] = (s%10)+10;
- DisplayBuff[3] = ms;
- }
- if(mode == 2) // 計數器模式，顯示計數
- {
- DisplayBuff[0] = count1/1000; //千位
- DisplayBuff[1] = (count1-(count1/1000)*1000)/100; //百位
- DisplayBuff[2] = (count1-(count1/100)*100)/10; //十位
- DisplayBuff[3] = count1%10; //個位
- }
- if(mode==3) //顯示時鐘的秒，
- {
- DisplayBuff[0] = 20; //第一位不顯示
- DisplayBuff[1] = 21; //第二位顯示一個點
- DisplayBuff[2] = sec/10;//顯示秒的十位
- DisplayBuff[3] = sec%10;//顯示秒的個位
- }
- }
- //**************//
- //鍵盤掃描子程序//
- //**************//
- void keyscan()
- {
- if(!key0 && bKey0Pressed == 0) //檢測到key0按下
- {
- keypress0 = 0;
- bKey0Pressed = 1; //防止重入此判斷
- while(!key0); //如果沒放開，就等下去
- }
- if(key0 && bKey0Pressed == 1) //檢測到key0放開
- {
- bKey0Pressed = 0; //防止重入此判斷
- if (keypress0<120) //如果是短按
- {
- if(ucStatus == 0x02)
- {
- ucStatus = 0x00;
- mode = 0; //時鐘模式
- t_adjust=0;
- }
- else if(ucStatus == 0x00)
- {
- ucStatus = 0x01;
- mode = 1; //秒表模式
- }
- else if(ucStatus == 0x01)
- {
- ucStatus = 0x02;
- mode = 2; //計數模式
- }
- }
- else if(keypress0>200) //如果是長按
- mode=3; //顯示時鐘的秒的模式
- }
- ////////////////////////////////
- if(mode == 0) //進入時鐘模式后
- {
- if(!key1 && (bKey1Pressed == 0))
- { keypress1 = 0;
- bKey1Pressed = 1;
- while(!key1);
- }
- if(key1 && (bKey1Pressed == 1))
- {
- bKey1Pressed = 0;
- if(keypress1 >= 200) //如果是長按
- {
- t_adjust++;
- if(t_adjust==3)
- t_adjust=0;
- }
- else if(keypress1 < 120)
- switch (t_adjust)
- {
- case 1:{ //調整分
- min++;
- sec = 0;
- if(min == 60)
- min = 0;
- }
- break;
- case 2: { //調整時
- hour ++ ;
- sec = 0;
- if(hour == 24)
- hour = 0;
- }
- break;
- default:break;
- }
- }
- }
- else if(mode == 1) //進入秒表模式
- {
- if(!key1 && bKey1Pressed == 0)
- {
- keypress1 = 0;
- bKey1Pressed = 1;
- while(!key1);
- }
- if(key1 && bKey1Pressed == 1)
- {
- bKey1Pressed = 0;
- if(keypress1 < 120) //短按
- {
- if(flag1==0) { start=2;flag1=1;} //start=2代表秒表開始計時
- else {start=0;flag1=0;} //start=0，秒表停止計時
- }
- else if(keypress1>200) //長按
- start=1; //秒表清零
- }
- }
- }
- void timer() //秒表子程序
- {
- if(mode==1) //進入秒表模式才執行
- {
- if(start==1) //清零
- {
- ms = 0;
- s = 0;
- ss = 0;
- mcount=0;
- }
- if(start==2) //秒表開始計時
- {
- if(mcount==20) //20*5ms=0.1s
- {
- mcount=0;
- ms++;
- if(ms == 10) // 10*0.1s=1s，s++
- {ms = 0;
- s ++;
- if(s == 100) //100s
- {s = 0;
- ss ++;
- if(ss == 10)
- {ss = 0;
- s = 0;
- ms = 0;
- }
- }
- }
- }
- }
- if (start==0);//秒表停止
- }
- }
- //////////////////////
- void it0(void) interrupt 0 using 1 //外部中斷0 服務程序
- {
- if(mode==2) //只有在計數模式才執行
- {
- count1++; //每響應一次，計數加一
- if(count1==10000) //超出四位時，不能再加
- count1 =9999;
- }
- }
- void it2(void) interrupt 2 using 2 //外部中斷0 服務程序
- {
- if(mode==2) //只有在計數模式才執行
- {
- if(count1!=0)
- {count1--;} //計數減一，不顯示負數，當減到零時便不能再減
- }
- }
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