单片机计时器程序0~9999

ID:954156 · 发表于 2021-7-17 17:35

#include <reg52.h>
sbit ADDR0 = P1^0;
sbit ADDR1 = P1^1;
sbit ADDR2 = P1^2;
sbit ADDR3 = P1^3;
sbit ENLED = P1^4;

unsigned char code LedChar[] = {  //数码管显示字符转换表
0xC0, 0xF9, 0xA4, 0xB0, 0x99, 0x92, 0x82, 0xF8,
0x80, 0x90, 0x88, 0x83, 0xC6, 0xA1, 0x86, 0x8E
};
unsigned char LedBuff[6] = {  //数码管显示缓冲区，初值0xFF确保启动时都不亮
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF
};
unsigned char i = 0; //动态扫描的索引
unsigned int cnt = 0;  //记录T0中断次数
unsigned char flag1s = 0;  //1秒定时标志

void main()
{
char j;  //循环变量
unsigned long sec = 0;  //记录经过的秒数
unsigned char buf[6]; //中间转换缓冲区

EA = 1;    //使能总中断
ENLED = 0; //使能U3
ADDR3 = 1; //因为需要动态改变ADDR0-2的值，所以不需要再初始化了
TMOD = 0x01;  //设置T0为模式1
TH0  = 0xFC;  //为T0赋初值0xFC67，定时1ms
TL0  = 0x67;
ET0  = 1;    //使能T0中断
TR0  = 1;    //启动T0

while (1)
{
      if (flag1s == 1)  //判断1秒定时标志
      {
         flag1s = 0; //1秒定时标志清零
         sec++;       //秒计数自加1
         //将sec按十进制位从低到高依次提取到buf数组中
         buf[0] = sec%10;
         buf[1] = sec/10%10;
         buf[2] = sec/100%10;
         buf[3] = sec/1000%10;
         buf[4] = sec/10000%10;
         buf[5] = sec/100000%10;
         //从最高为开始，遇到0不显示，遇到非0退出循环
         for (j=5; j>=1; j--)
         {
            if (buf[j] == 0)
                  LedBuff[j] = 0xFF;
            else
                  break;
         }
         //将剩余的有效数字位如实转换
         for ( ; j>=0; j--)  //for()起始未对j操作，j即保持上个循环结束时的值
         {
            LedBuff[j] = LedChar[buf[j]];
         }
      }
}
}
/* 定时器0中断服务函数 */
void InterruptTimer0() interrupt 1
{
TH0 = 0xFC;  //重新加载初值
TL0 = 0x67;
cnt++;    //中断次数计数值加1
if (cnt >= 1000)  //中断1000次即1秒
{
      cnt = 0;    //清零计数值以重新开始下1秒计时
      flag1s = 1; //设置1秒定时标志为1
}
//以下代码完成数码管动态扫描刷新
P0 = 0xFF; //显示消隐
switch (i)
{
      case 0: ADDR2=0; ADDR1=0; ADDR0=0; i++; P0=LedBuff[0]; break;
      case 1: ADDR2=0; ADDR1=0; ADDR0=1; i++; P0=LedBuff[1]; break;
      case 2: ADDR2=0; ADDR1=1; ADDR0=0; i++; P0=LedBuff[2]; break;
      case 3: ADDR2=0; ADDR1=1; ADDR0=1; i++; P0=LedBuff[3]; break;
      case 4: ADDR2=1; ADDR1=0; ADDR0=0; i++; P0=LedBuff[4]; break;
      case 5: ADDR2=1; ADDR1=0; ADDR0=1; i=0; P0=LedBuff[5]; break;
      default: break;
}
}

原理图:http://www.51hei.com/bbs/dpj-210214-1.html

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单片机计时器程序0~9999

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