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使用頭文件如下：
**************************/
#include "STC15F2K60S2.H"
#include <intrins.h> //_cror_();
#define uint unsigned int
#define ulint unsigned long
#define uchar unsigned char
#define ADC_FLAG 0x10
/**************************
引腳別名定義如下：
**************************/
sbit SEL0 = P2^0;
sbit SEL1 = P2^1;
sbit SEL2 = P2^2;
sbit LED_SEL = P2^3;
/**************************
定義變量如下：
**************************/
uint global = 0;
uint date_h = 0;
ulint sum = 0;
uint x = 0;
uint y = 0;
uchar seg_flag;
//0123456789-
char duanxuan[] = {0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71};
//選擇哪一位數(shù)碼管
uchar weixuan[] = {0x00,0x06,0x07};
//初始化系統(tǒng)
void InitSYS(){
//P0口推挽輸出，用于給數(shù)碼管和發(fā)光二極管增加電流
P0M1 = 0x00;
P0M0 = 0xff;
//P2.3(即LED_SEL),P2.2,P2.1為推挽輸出
P2M1 = 0x00;
P2M0 = 0x0E;
seg_flag = 0;
TMOD = 0x00; //定時(shí)器0，工作方式1；
EA = 1; //打開(kāi)總中斷；
TH0 = (65535-1000)/256; //定時(shí)器初值 定時(shí)大約1mS
TL0 = (65535-1000)%256;
ET0 = 1; //打開(kāi)定時(shí)中斷；
TR0 = 1; //啟動(dòng)定時(shí)器；
}
//初始化ADC
void InitADC()
{
P1ASF = 0x80; //P1.7作為A/D使用
ADC_RES = 0; //清零ADC結(jié)果寄存器
ADC_CONTR = 0X8F; //打開(kāi)ADC電源 540個(gè)時(shí)鐘周期轉(zhuǎn)換一次 選擇P1.7作為A/D輸入來(lái)用
CLK_DIV = 0X00; //ADRJ = 0 ADC_RES存放高八位結(jié)果
EADC = 1; //允許ADC中斷
PADC = 1; //ADC中斷優(yōu)先級(jí)為1
}
//顯示高三位和低五位
void HighThree()
{
x = date_h&0xE0; //將八位轉(zhuǎn)換結(jié)果的低五位清零
x = _cror_(x,5); //將高三位移到低三位 獲取高三位數(shù)值
y = date_h&0x1F; //將八位轉(zhuǎn)換結(jié)果的高三位清零
}
void timer0() interrupt 1 {
seg_flag++;
if(seg_flag==4)
seg_flag = 0;
P0 = 0x00;
switch(seg_flag) {
case 0:
LED_SEL = 0; //選擇數(shù)碼管顯示
P2 = weixuan[seg_flag];
P0 = duanxuan[x]; //顯示ADC轉(zhuǎn)換結(jié)果高三位的十進(jìn)制值
break;
case 1:
LED_SEL = 0; //選擇數(shù)碼管顯示
P2 = weixuan[seg_flag];
P0 = duanxuan[y/10]; //顯示ADC轉(zhuǎn)換結(jié)果低五位的十進(jìn)制值的高位
break;
case 2:
LED_SEL = 0; //選擇數(shù)碼管顯示
P2 = weixuan[seg_flag];
P0 = duanxuan[y%10]; //顯示ADC轉(zhuǎn)換結(jié)果低五位的十進(jìn)制值的低位
break;
case 3:
LED_SEL = 1; //選擇發(fā)光二極管顯示
P0=date_h;
break;
}
}
//AD中斷
void adc_isr() interrupt 5
{
IE=0x00; //關(guān)閉所有中斷，防止數(shù)據(jù)沒(méi)有采集完就進(jìn)入新的中斷
ADC_CONTR&=~0X10; //將ADC_FLAG位清零
global++;
if(global>1000) //將采集1000次后的數(shù)據(jù)求出平均值
{
date_h=(sum+500)/1000;//四舍五入
HighThree(); //獲取轉(zhuǎn)換結(jié)果高三位和低五位
global=0;
sum=0;
}
sum+=ADC_RES;
ADC_CONTR|=0X08; //將ADC_START進(jìn)行軟件置位
IE=0xa2; //開(kāi)啟中斷
}
void main() //主函數(shù)
{
InitSYS();
InitADC();
while(1)
;
}
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