電位器調(diào)節(jié)待檢測電壓值,在數(shù)碼管上顯示出來,

代碼大多從書上搬過來的,書上例5.3.1要求前3個數(shù)碼管顯示AD轉(zhuǎn)換后的8位數(shù)字量(即0~255)

我這里讓前4個數(shù)碼管顯示具體電壓值,比如1.352

C代碼

#include

#include"MY51.H"

voidinitSMG()//數(shù)碼管初始化信息

{

//上電時,都為高電平

P0=0xff;

wela=open;

P0=0xff;

wela=lock;

P0=0;

dula=open;

P0=0;

dula=lock;

}

voidADC0804_csToLow()//cs置低電平

{

wela=open;//打開鎖存器

P0=0x7f;//鎖存器最高位送0,也就是CSAD置0

wela=lock;

}

voidADC0804_startConvert()//P3.6口是wr,由高到底,再拉高后,ad開始轉(zhuǎn)換

{

adwr=high;//雖然原本就是高的,但我們要養(yǎng)成好習(xí)慣,該是什么就是什么

_nop_();

adwr=low;//wr置低后,過小會后AD內(nèi)部開始執(zhí)行轉(zhuǎn)換,轉(zhuǎn)換完成后INTR自動置低觸發(fā)中斷

_nop_();

adwr=high;

//由于我們用的不是150pF電容,而是104pF,所以轉(zhuǎn)換比較慢,在調(diào)用本函數(shù)后最好延時10毫秒以上

}

uint8ADC0804_readResult()//讀轉(zhuǎn)換結(jié)果

{

uint8result=0;

//延時一會兒,轉(zhuǎn)換就完成了,由于我們將INTR和CS都拉低了,直接操作RD后就可以讀了

P1=0xff;//防止由于轉(zhuǎn)換未完成原因引起的誤讀

adrd=high;

_nop_();

adrd=low;//rd置低電平后數(shù)據(jù)總線P1口得到數(shù)據(jù),并由led顯示現(xiàn)象

_nop_();

result=P1;

adrd=high;

//讀完以后,如果ad芯片不用了,就把cs拉高,注銷片選

returnresult;

}

voidshow(uint8value)//基準(zhǔn)電壓是2.5V為了計(jì)算方便擴(kuò)大到2500

{

uint16temp=value*(2500/255.0);//擴(kuò)大到4位整數(shù),小數(shù)點(diǎn)另外附加顯示

uint8oneWela,twoWela,threeWela,fourWela;//oneWela是最左邊的數(shù)碼管

oneWela=temp/1000;

twoWela=temp%1000/100;

threeWela=temp%100/10;

fourWela=temp%10;

displaySMG(oneWela,twoWela,threeWela,fourWela,dark,dark,dotTable[1]);//最左邊的數(shù)碼管顯示小數(shù)點(diǎn)

}

voidmain()

{

uchari=0;

ucharadTemp=0;

initSMG();//數(shù)碼管數(shù)據(jù)初始化

ADC0804_csToLow();//cs置低

while(1)

{

ADC0804_startConvert();//開始將電壓數(shù)據(jù)轉(zhuǎn)換成數(shù)字信號

for(i=5;i>0;i--)//主要是延時一段時間,讓ad完成轉(zhuǎn)換

{

delayms(1);

show(adTemp);//延時的時候,數(shù)碼管繼續(xù)動態(tài)顯示

}

adTemp=ADC0804_readResult();//讀取數(shù)據(jù)

show(adTemp);

}

}

C代碼

#ifndef_MY51_H_

#define_MY51_H_

#include

#include

typedefintint16;

typedefintINT16;

typedefunsignedintuint16;

typedefunsignedintUINT16;

typedefunsignedshortuint;

typedefunsignedshortUINT;

typedefunsignedshortword;

typedefunsignedshortWORD;

typedefunsignedlonguint32;

typedefunsignedlongUINT32;

typedefunsignedlongDWORD;

typedefunsignedlongdword;

typedefsignedlongint32;

typedefsignedlongINT32;

typedeffloatfloat32;

typedefdoubledouble64;

typedefsignedcharint8;

typedefsignedcharINT8;

typedefunsignedcharbyte;

typedefunsignedcharBYTE;//WINDOWS的windef.h里面是這么定義的

typedefunsignedcharuchar;

typedefunsignedcharUCHAR;

typedefunsignedcharUINT8;

typedefunsignedcharuint8;

typedefunsignedcharBOOL;//windows中定義BOOL為int

typedefunsignedcharbool;//bool是c++的內(nèi)置類型

#defineTRUE1

#definetrue1

#defineFALSE0

#definefalse0

#defineopen1//open和close用于標(biāo)志打開和關(guān)閉狀態(tài)

#defineOPEN1

#defineclose0

#defineCLOSE0

#definelock0

#definestart1

#defineSTART1

#definestop0

#defineSTOP0

#definekeyDown0

#definekeyUp1

#definegnd0//接地

#defineGND0//接地

#definehigh1//高電平

#definelow0//低電平

#defineyes1

#defineYES1

#defineno0

#defineNO0

sbitdula=P2^6;//段選鎖存器控制控制筆段

sbitwela=P2^7;//位選鎖存器控制控制位置

#defineledP1//燈總線控制

sbitled0=P1^0;//8個led燈,陰極送低電平點(diǎn)亮

sbitled1=P1^1;

sbitled2=P1^2;

sbitled3=P1^3;

sbitled4=P1^4;

sbitled5=P1^5;

sbitled6=P1^6;

sbit led7=P1^7;