ad.c

adc转换器

/************************************************/
/*            ADC0804模数转换数码管显示         */
/*   http://www.nuedc.net.cn   By 杨sir         */
/************************************************/
#include <REGX51.H>


#define uchar unsigned char
#define	uint unsigned int

sbit wx=P2^3;
sbit dx=P2^4;
sbit cs=P2^7;
sbit wr=P2^6;
sbit rd=P2^5;
uchar code table[]={0x3f,0x06,0x5b,0x4f,
					0x66,0x6d,0x7d,0x07,
					0x7f,0x6f,0x77,0x7c,
					0x39,0x5e,0x79,0x71,0x80};
uchar num;
uint num2;
float num1;
float jizhun=5.0;
void display();
void delay(uint ms);
void adcstart();
void adcread();
void main()
{
	while(1)
	{
		adcstart();
	  	adcread();
	  	display();

	}

}
void display()
{
	num1=num*jizhun/256;
	num2=num1*100;
	wx=1;
	P0=0xdf;
	wx=0;
	dx=1;
	P0=table[num2%10000%1000%100%10];
	dx=0;
	delay(10);

	wx=1;
	P0=0xef;
	wx=0;
	dx=1;
	P0=table[num2%10000%1000%100/10];
	dx=0;
	delay(10);

	wx=1;
	P0=0xf7;
	wx=0;
	dx=1;
	P0=table[16];
	dx=0;
	delay(10);

	wx=1;
	P0=0xfb;
	wx=0;
	dx=1;
	P0=table[num2%10000%1000/100];
	dx=0;
	delay(10);
	
	wx=1;
	P0=0xfd;
	wx=0;
	dx=1;
	P0=table[num2%10000/1000];
	dx=0;
	delay(10);

	wx=1;
	P0=0xfe;
	wx=0;
	dx=1;
	P0=table[num2/10000];
	dx=0;
	delay(10);
}
void adcstart()
{
	cs=1;
	cs=0;
	wr=1;
	wr=0;
	delay(10);
}
void adcread()
{
	rd=1;
	rd=0;
	delay(10);
	num=P1;
	cs=1;
	rd=1;

}
void delay(uint ms) 
{
  uchar x;
  while(ms--)
  {
    for(x = 0; x < 120;x++);
  }
}