单片机实验代码数字电压表 -

标题: 单片机实验代码数字电压表 [打印本页]

作者: QAQ55552 时间: 2020-5-28 22:26
标题: 单片机实验代码数字电压表
#include <reg52.h>

#define uchar unsigned char
#define uint  unsigned int

unsigned char code table[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f};
//0-9的码表
uint temp;
sbit START = P2^4;
sbit ALE = P2^7;
sbit OE = P2^6;
sbit EOC = P3^3;
sbit ADD_A = P2^2;
sbit Q1 = P3^4;
sbit Q2 = P3^5;
sbit Q3 = P3^6;
sbit Q4 = P3^7;

void delay(uint z)
{
uint x,y;
for(x = z; x > 0; x--)
for(y = 114; y > 0 ; y--);
}

void ADC0809_init()
{
ALE = 0;
START = 0;
ADD_A = 0;
ALE = 1;
START = 1;
}

void display(uint num)
{
uint qian,bai,shi,ge;

qian = num/1000;
bai = num%1000/100;
shi = num%100/10;
ge = num%10;

Q4 = 1;
Q1 = 0;
P1 = table[qian] | 0x80;
delay(5);

Q1 = 1;
Q2 = 0;
P1 = table[bai];
delay(5);

Q2 = 1;
Q3 = 0;
P1 = table[shi];
delay(5);

Q3 = 1;
Q4 = 0;
P1 = table[ge];
delay(5);

}

void main()
{
       ADC0809_init();
   EA = 1;
   EX1 = 1;
   IT1 = 1;
   while(1);
}

void ADC_int()  interrupt 2
{
display(temp);
ALE = 0;
START = 0;
temp = P0/256.0*5*1000;
ALE = 1;
START = 1;
EA = 1;
}

作者: admin 时间: 2020-6-1 01:26
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