频率发生器0.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

//题2：要求能从P17口输出5，50，500，5000Hz的方波，并用1#~4#键依次选择方波频率，然后显示其实测频率。
//int0+int1
#include <stdio.h>
#include <reg51.h>
#include <intrins.h>
#define hi1 0x3c
#define lo1 0xb0 //50ms
#define uchar unsigned char
#define uint unsigned int
sbit P10=P1^0;
sbit P20=P2^0;sbit P21=P2^1;sbit P22=P2^2;
uchar key,key_count,disp[4],disp_t[4],mask=0xee,led_no=0;
uchar flag,hi,lo,k,k1;
uint t0_count,int_count,t0_count_1s;
uchar code ledk[17]
       ={0x3f,0x06,0x5b,0x4f,0x66,0x6d,
        0x7d,0x07,0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71,0x00 };
sbit P37=P3^7;sbit clk=P0^7;sbit sda=P0^6;               //74LS164
void delay (uint n)
{unsigned int i,j;
 for(i=0;i<n;i++)
   for(j=0;j<n ;j++);   }
void shift(uchar dx)
{uchar j=0;
 while(j<8)
	{if((dx&0x80)!=0) sda=1;
       else  sda=0;
	   clk=0;clk=1;
	   dx<<=1;j++;}  }
void  int0() interrupt 0
{ int_count++; }
void t0() interrupt 1
{TH0=hi;TL0=lo;t0_count++;
  if(k==2){k1++;
           if(k1==k){P10=!P10;k1=0;}}
  else P10=!P10;
 if(t0_count==t0_count_1s){TR0=0;flag=1;t0_count=0;}  }
void t1() interrupt 3 
 {TH1=hi1;TL1=lo1;key_count++;}//防抖动
void hextodec_int(uint xx)
{disp[3]=xx/1000;       
xx=xx%1000;
 disp[2]=xx/100;       
xx=xx%100;
 disp[1]=xx/10;      
 disp[0]=xx%10;  }
void display( )
{ shift(ledk[disp[led_no]]);P2=mask;  }
unsigned char get_char()
{unsigned char key_code;
  static unsigned char column=1;
  if(P37==0 && key_count>5){key_code=column;key_count=0;}
       else key_code=0xff;
  mask=_crol_(mask,1);
  led_no++; if(led_no>3)led_no=0;
  column++; if(column>4)column=1; 
  return(key_code);}
void key_func(key)
 {switch (key)
   {case 1:t0_count_1s=20;k=2;hi=0x3c;lo=0xb0;TH0=hi;TL0=lo;int_count=0;TR0=1;break;  
    case 2:t0_count_1s=100;k=0;hi=0xd8;lo=0xf0;TH0=hi;TL0=lo;int_count=0;TR0=1;break;  
    case 3:t0_count_1s=1000;k=0;hi=0xfc;lo=0x18;TH0=hi;TL0=lo;int_count=0;TR0=1;break;  
    case 4:t0_count_1s=10000;k=0;hi=0xff;lo=0x9c;TH0=hi;TL0=lo;int_count=0;TR0=1;break;
    default:break;  }  }
void main(void)
{//uchar i;
 TMOD=0x11;TH1=hi1;TL1=lo1;
 EA=1;ET0=1;ET1=1;EX0=1;IT0=1;int_count=0;P10=0;TR0=0;TR1=1;
 while(1)
  { key=get_char( );key_func(key);delay(10);
    if(flag==1){hextodec_int(int_count);flag=0;} 
    display();
   }
 }