disp_秒表_1.c

单片机C语言15个实验附有原理图和程序 是我的课程作业 以经过实践验证

//int0+int1
#include <stdio.h>
#include <reg51.h>
#include <intrins.h>
#define hi 0xd8
#define lo 0xf0   //10ms
#define hi1 0x3c
#define lo1 0xb0   //50ms
unsigned char led_no,array_no=8,mask=0xfe,disp[4],int_flag,key_count;
unsigned int tf0;
unsigned char code ledk[14]
       ={0x3f,0x06,0x5b,0x4f,0x66,0x6d,
        0x7d,0x07,0x7f,0x6f,0xf3,0x79,0x3e,0x31};//p10,E11,U12,r13
unsigned long t,time _at_ 0x30,time1 _at_ 0x40;
sbit P37=P3^7;sbit clk=P0^7;sbit sda=P0^6;               //74LS164
void delay(unsigned int n)
{ unsigned int i,j;
  for(i=0;i<n;i++)
     for(j=0;j<n;j++)
       ;}
void shift(unsigned char dx)
{unsigned char j=0;
  while(j<8)
	{if((dx&0x80)!=0) sda=1;
       else  sda=0;
	   clk=0;clk=1;
	   dx<<=1;j++;}  }

void hextodec(int xx)
{xx=xx%10000;
 disp[3]=xx/1000;       xx=xx%1000;
 disp[2]=xx/100;        xx=xx%100;
 disp[1]=xx/10;         
 disp[0]=xx%10;    }

void  int0() interrupt 0
{if(key_count>5)    //防抖动
   {key_count=0;int_flag++;
    if(int_flag%2==1)TR1=1;
    if(int_flag%2==0)TR1=0; }  }

void t0() interrupt 1 
 {TH0=hi1;TL0=lo1;key_count++; }//防抖动

void t1() interrupt 3
{TH1=hi;TL1=lo;tf0++;}

 void out()
 {time=(long)10*tf0;   //time=(10*tf0)ms
  time1=((TH1*256+TL1)-(hi*256+lo))*(long)10/(0x10000-(hi*256+lo));//time1<10ms
  if(time1>4) t=time/10+1;//t的单位是ms
       else t=time/10;      //对t四舍五入
  hextodec((int)t);
  led_no++;if(led_no>3)led_no=0;
  if(led_no==2)shift(ledk[disp[led_no]]|0x80);
          else shift(ledk[disp[led_no]]);
  mask=_crol_(mask,1);if(mask==0xef)mask=0xfe;
   P2=mask;} 
void main(void)
{TMOD=0x11;TH1=hi;TL1=lo;TH0=hi1;TL0=lo1;ET0=1;ET1=1;EX0=1;IT0=1;EA=1;TR0=1;
 int_flag=0;
 while(1)
  {out();delay(2);
   if(time>99999){tf0=0;TH1=hi;TL1=lo;}
 }  }