text1.c

数模转换

#include<absacc.h>
#include<reg51.h>

#define uchar unsigned char
#define uchar unsigned char
#define uint  unsigned int
sbit START=P3^0;
sbit OE=P3^1;
sbit EOC=P3^2;
sbit PWM=P3^7;
uchar data  led[4];
uint data  tvdata;

    

uchar code  tv[]={0xfe,0xfd,0xfb,0xf7};
uchar code  a[]={0x3f,0x06,0x5b,0x4f,
                 0x66,0x6d,0x7d,0x07,0x7f,0x6f};
                     
void delay(void)                      //延时程序
{
  uint i;
  for(i=0;i<10;i++);
}


void ledxianshi(void)       //显示模块
{
  uchar k,i;
  led[0]=tvdata%10;
  led[1]=tvdata/10%10;
  led[2]=tvdata/100%10;
  led[3]=tvdata/1000;
		
  for(k=0;k<4;k++)
  { 
   P2=tv[k];
   i=led[k];
   P1=a[i];
   delay();
  }
} 


void main(void)
{
   
  while(1)
  {
	TMOD=0x01;
	TR0=1;
	START=1;
   START=0;          //启动转换
   while(EOC==0);
   OE=1;
   tvdata=P0;
   OE=0;
	TH0=(65536-(tvdata+1)*256)/256;
	TL0=(65536-(tvdata+1)*256)%256;
	do{ledxianshi();}while(!TF0);
	PWM=!PWM;
	TF0=0;
	TH0=((tvdata)*256)/256;
	TL0=((tvdata)*256)%256;
	do{ledxianshi();}while(!TF0);	
    PWM=!PWM;
	TF0=0;
   }
}