ad.c

单片机与ad574的数据通信及ad574转换

#include <stdio.h>
#include <AT89X52.H>
#include <intrins.h>
#include <math.h>
void ad574();
void delayus(int n);
void delayms(int r);
void Send_PC(void);
unsigned int ah,al,a;
void Init_Com() 
  {
	PCON = 0x00;
	TMOD = 0x20;
	SM1 = 1;
	SM0 = 0;
	REN = 1;
	TH1 = 0xfd;
	TL1 = 0xfd;
	EA = 1;
	ES = 1;
	TR1 = 1;
  }
void ad574(void)
 {    P2_0=0;
      P2_1=0;
	  P2_2=0;
	  P2_3=1;
    delayus(100);
      P2_0=1;
	  P2_1=1;
      P2_2=0;
	  P2_3=0;
      ah=P1;
	  P2_2=1;
      al=P1;
      ah=ah<<4;
      al=al>>4;
      a=ah|al;
 }
void Send_PC(void)
 {
	unsigned char Data[4],k;
	Data[0] = a/1000;
	Data[1] = (a/1000)%100;
	Data[2] = (a/100)%10;
	Data[3] = a%10;
	for (k = 0 ; k < 4; k++ ) 
	{
		SBUF = Data[k];
		delayms(1);
	  }
	delayms(1000);
  }
void delay(int n)
  {    while(n--)
         ;  
            }
void delayms(int r)
    {   int i;
	   while(r--) 
        for(i=0;i<125;i++)
               ;
       }
void Interrupt_Com() interrupt 4 
 {
	if (TI == 1) 
    {
		TI = 0;
    	}
	if (RI == 1)
   {
		RI = 0;
     	}
    } 
void main( )
 {   Init_Com();
   while(1)
    {
      ad574();
      Send_PC();
     }
  }