file:///C:/Documents%20and%20Settings/詩(shī)琪/Application%20Data/Tencent/Users/1418143663/QQ/WinTemp/RichOle/U(5VM1XT4W}ZJR82(O2B]BX.jpg
/**********等精度頻率計(jì)*************/
/******LCD1602+STC12c5410AD+40M*****/
/************2011-8-2***************/
/***********0.1HZ-32MHZ*************/
#include"STC12C5A60S2.H"
#include "stdio.h"
#include"intrins.h"
#define uchar unsigned char
#define uint unsigned int
/************端口定義***************/
sbit fp = P3^7;
sbit lcdrs = P2^1;
sbit lcden = P2^0;
sbit GATE = P2^4; //門控信號(hào)
/************變量聲明***************/
uint t0,t1;
double feq; //測(cè)得頻率值
uint x=1000;//初始化閘門時(shí)間
/************1ms延時(shí)***************/
void delay(uint z)
{
uint x,y;
for(x=z;x>0;x--)
for(y=1400;y>0;y--);
}
/**********液晶寫指令*************/
void write_com(uchar com)
{
lcdrs=0;
lcden=0;
P1=com;
delay(1);
lcden=1;
delay(1);
lcden=0;
}
/**********液晶寫數(shù)據(jù)*************/
void write_date(uchar date)
{
lcdrs=1;
lcden=0;
P1=date;
delay(1);
lcden=1;
delay(1);
lcden=0;
}
/**********液晶初始化*************/
void init()
{
uchar num;
uchar code table[]="f: ---Ready---- ";//初始化顯示
uchar code table1[]="t: ---Ready---- ";
lcden=0;
GATE=0; //開(kāi)始先關(guān)閘門保證第一次測(cè)量準(zhǔn)確
write_com(0x38);
write_com(0x0c);
write_com(0x06);
write_com(0x01);
write_com(0x80);
for(num=0;num<15;num++)
write_date(table[num]);
write_com(0x80+0x40);
for(num=0;num<15;num++)
write_date(table1[num]);
TMOD=0xD9; //T0內(nèi)計(jì)數(shù)，T1外計(jì)數(shù)
AUXR=(AUXR|0x80);
AUXR=(AUXR|0x40);
AUXR=(AUXR|0x04);
TR0=1;
TR1=1;
ET0=1;
ET1=1;
EA=1; //EA最后保證一起計(jì)數(shù)
}
/**********拆分顯示*************/
void write(double f)
{
uchar i;
uchar ch[12];
sprintf(ch, "%.6f", f); //把數(shù)轉(zhuǎn)換為字符串
for(i=0;ch!='\0';i++)
{
write_date(ch);
}
}
/*********頻率計(jì)算*************/
void calcu_Fx()
{
uchar i;
float N,M;
double feq_cl;
M=(t0*65536)+(TH0*256)+TL0; //內(nèi)計(jì)數(shù)值
N=(t1*65536)+(TH1*256)+TL1; //外計(jì)數(shù)值
if(fp==0) //判斷是否分頻
feq=(N/M)*80000000;
else
feq=(N/M)*40000000;
feq_cl=feq;
write_com(0x80+0x03); //第一行刷屏
for(i=0;i<16;i++)
write_date(' ');
write_com(0x80+0x43); //第二行刷屏
for(i=0;i<16;i++)
write_date(' ');
if(feq>0.05&feq<=1000) //頻率顯示HZ/周期S
{
write_com(0x80+0x03);
write(feq_cl);
write_date('H');
write_date('z');
write_com(0x80+0x43);
write(1/feq_cl);
write_date('s');
}
else if(feq>1000&feq<=1000000)//頻率顯示KHZ/周期mS
{
write_com(0x80+0x03);
write(feq_cl/1000);
write_date('K');
write_date('H');
write_date('z');
write_com(0x80+0x43);
write(1000/feq_cl);
write_date('m');
write_date('s');
}
else if(feq>=1000000) //頻率顯示MHZ/周期uS
{
write_com(0x80+0x03);
write(feq_cl/1000000);
write_date('M');
write_date('H');
write_date('z');
write_com(0x80+0x43);
write(1000000/feq_cl);
write_date('u');
write_date('s');
}
else //無(wú)輸入頻率顯示0HZ周期顯示0s
{
write_com(0x80+0x03);
write(0);
write_date('H');
write_date('z');
write_com(0x80+0x43);
write(0);
write_date('s');
}
}
/********自動(dòng)閘門選擇*************/
void chane_time()
{
if(feq>0.05&feq<=0.5) //頻率小于0.5HZ 閘門時(shí)間20秒
x=20000;
if(feq>0.5&feq<=10)//頻率小于10HZ大于0.5HZ，閘門時(shí)間6秒
x=8000;
if(feq>10&feq<=100)//頻率小于100HZ大于10HZ，閘門時(shí)間4秒
x=6000;
if(feq>100&feq<=10000)//頻率小于2000HZ大于100HZ，閘門時(shí)間2秒
x=4000;
if(feq>10000) //頻率大于10K閘門時(shí)間1S
x=2000;
}
/**********主程序*************/
void main()
{
init(); //測(cè)頻初始化
while(1)
{
GATE=1; //開(kāi)閘門
delay(2*x); //延時(shí)關(guān)門時(shí)間（第一次1秒）
GATE=0; //閘門時(shí)間到gate為0；關(guān)門然后計(jì)算
calcu_Fx(); //計(jì)算頻率
TH1=TL1=TH0=TL0=t1=t0=0; //所以計(jì)數(shù)清零為下次做準(zhǔn)備
chane_time(); //根據(jù)頻率選擇閘門時(shí)間
}
}
/*******定時(shí)器0對(duì)內(nèi)計(jì)數(shù)*********/
void timer0() interrupt 1
{
t0++; //內(nèi)部計(jì)數(shù)
}
/*******定時(shí)器1對(duì)外計(jì)數(shù)*********/
void timer1() interrupt 3
{
t1++;//外部計(jì)數(shù)
}
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