|
|
最近用ADC0804學(xué)習(xí)數(shù)據(jù)轉(zhuǎn)換，正常，可用ADC0808在proteus上仿真時(shí)出現(xiàn)不能正確解析中間量的問題：調(diào)節(jié)電位器在最大時(shí)能顯示“0”v，調(diào)節(jié)電位器最小時(shí)，能采集并顯示“5”v，可是調(diào)節(jié)到中間位置時(shí)就亂了。百思不得要領(lǐng)，還請(qǐng)個(gè)位老師和大蝦指點(diǎn)，非常感謝！
程序如下：
#include <reg52.h>
#include <intrins.h>
typedef unsigned char u8;
typedef unsigned int u16;
u8 qian,bai,shi,ge;
u8 code shuju[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f};
sbit clk=P3^0;
sbit start=P3^1;
sbit eoc=P3^2;
sbit oe=P3^3;
sbit ada=P3^4;
sbit adb=P3^5;
sbit adc=P3^6;
sbit dp=P1^7;
void inittime()//定時(shí)器初始化
{
TMOD=0x02;
TH0=0xfb;
TL0=0xfb;
EA=1;
ET0=1;
TR0=1;
}
void timer0() interrupt 1//定時(shí)器函數(shù)
{
clk=~clk;
}
void delay(u8 z)//延時(shí)函數(shù)
{
while(z--);
}
void display()//數(shù)碼管顯示函數(shù)
{
P2=0xfe|0x80;//指定哪位數(shù)碼管顯示，不影響高4位的值
P1 = shuju[qian];
dp=1;//增加小數(shù)點(diǎn)
delay(50);
P2=0xfd|0x80;
P1 = shuju[bai];
//dp=1;
delay(50);
P2=0xfb|0x80;
P1 = shuju[shi];
//dp=1;
delay(50);
P2=0xf7|0x80;
P1 = shuju[ge];
delay(50);
}
void adc_get()//ADC采集及轉(zhuǎn)換函數(shù)
{
u16 temp = 0; //轉(zhuǎn)換電壓值
u8 x = 0; //存儲(chǔ)P0口的數(shù)值
ada=adb=adc=0;
start=0;
start=1;
delay(5);
start=0;
while(eoc!=1);
oe=1;
x=P0;
oe=0;
temp = x * (1.0/255)*5*1000; //讀取的電壓擴(kuò)大1000倍
qian=temp/1000;
bai=temp%1000/100;
shi=temp%100/10;
ge=temp%10;
}
void main()
{
inittime();
while(1)
{
adc_get();
display();
}
}
|
-
-
|
