原创 adc0809中文资料以及与51接口功能电路程序

源代码：

/*精度5v/256=0.0195=0.02*/

#include <regx51.h>

#include <intrins.h>

#define adda P3_4

#define addb P3_5

#define addc P3_6

#define uint unsigned int

#define uchar unsigned char

#define TIMER0_COUNT 0XF05F//4MS中断一次

sbit ST   = 0xb2; //sbit:绝对定址的位元            （bit）变数

sbit OE   = 0xb0; //sbit前不可加static

sbit EOC = 0xb1;

uchar code led_7seg[10] = {0x3F,0x06,0x5B,0x4F,0x66,0x6D,0x7D,0x07,0x7F,0x6F};

uchar code position[3] = {0xfd,0xfb,0xf7};

uchar dis_buff[3];

uint ad_data;

uint voltage;

/*数码管显示函数*/

void display(void)

{

     static char posit = 0;

     P2 = 0XFF; //全灭，避免重影/

     P0 = led_7seg[dis_buff[posit]];

    if (posit == 0)

    {

        P0_7 = 1;

    }

   else

   {

       P0_7 = 0;

   }

   P2 = position[posit];

   if (++posit >= 3)

   {

       posit = 0;

   }

}

/*timer0 4ms中断服务函数*/

static void timer0_isr(void) interrupt TF0_VECTOR using 1   //4ms中断一次

{

     TR0 = 0;

     TL0 = (TIMER0_COUNT & 0X00FF);   //低八位的值赋给TL0

     TH0 = (TIMER0_COUNT >> 8);    //高八位的值赋给TH0   TL0,TH0都只有八位

     TR0 = 1;

     display();

}

/*timer0 初始化函数*/

static void timer0_initialize(void)

{

     EA = 0;

    TR0 = 0;

    TMOD &= 0XF0;

    TMOD |= 0X01;

    TL0 = (TIMER0_COUNT & 0X00FF);  

    TH0 = (TIMER0_COUNT >> 8);

    PT0 = 1;

    ET0 = 1;

    TR0 = 1;

    EA = 1;

}

/*电压计算函数*/

void data2voltage()

{

    voltage = ad_data*2; //OutData*0.02*100;256

    dis_buff[0] = voltage/100;

    dis_buff[1] = voltage%100/10;

    dis_buff[2] = voltage%10;

}

void main(void)

{ //0口作为模拟输入口

    adda = 0;

    addb = 0;

    addc = 0;

    timer0_initialize();

    while(1)

    {

        OE = 0;

        ST = 0;

        ST = 1;

        _nop_();//保证足够的上升沿

        ST = 0;

        while(!EOC); //wait conv

        OE = 1;

        ad_data = P1;

        OE = 0;

        data2voltage();

    }

}