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<font face="宋體">#include <reg52.h>
#include "LCD1602.h"
unsigned char welcome[]={"welcome!"};
unsigned char Show0[6]={"Noise:"};
unsigned char Show1[5]={"dB"};
/*unsigned int code Countnum[60]={ 11, 13, 15, 17, 19, 22, 24, 27, 31, 34, //T0計數值
39, 44, 49, 55, 62, 69, 78, 87, 98, 110,
123, 138, 155, 174, 195, 219, 246, 276, 309, 347,
390, 438, 491, 550, 618, 693, 778, 873, 979, 1099,
1233,1383,1552,1742,1954,2193,2460,2760,3097,3475,
3899,4375,4909,5508,6180,6934,7780,8729,9794,10989,};*/
unsigned long code Countnum[100]={10,11,12,13,15,17,19,22,25,28,
31,35,39,43,48,54,60,67,75,84,
94,105,117,131,146,163,182,204,228,255,
286,320,359,402,451,506,567,636,713,799,
896,1005,1127,1264,1418,1590,1783,2000,2244,2517,
2824,3168,3556,3989,4475,5020,5632,6319,7089,7953,
8923,10011,11232,12602,14139,15863,17798,19969,22405,25138,
28204,31644,35504,39835,44694,50146,56263,63127,70828,79469,
89164,100042,112247,125941,141305,158544,177886,199588,223937,251257,
281910,316303,354891,398187,446765,501270,562424,631039,708025,794404,};
unsigned char code dB[100][3]={"031","032","033","034","035","036","037","038","039","040", //T0計數值對應 dB
"041","042","043","044","045","046","047","048","049","050",
"051","052","053","054","055","056","057","058","059","060",
"061","062","063","064","065","066","067","068","069","070",
"071","072","073","074","075","076","077","078","079","080",
"081","082","083","084","085","086","087","088","089","090",
"091","092","093","094","095","096","097","098","099","100",
"101","102","103","104","105","106","107","108","109","110",
"111","112","113","114","115","116","117","118","119","120",
"121","122","123","124","125","126","127","128","129","130",
};
sbit beep=P2^2;
sbit key_1=P2^1;
sbit key_2=P2^0;
//////////////////////////////////////////////////////全局變量/////////////////////////////////////////////////////
unsigned long count,c;
uchar t,z;
uchar shu,ys;
//////////////////////////////////////////////////////函數聲明////////////////////////////////////////////////////
/************************************
延時子程序
延時時間(xms*1)ms
*************************************/
void delayms(uint xms) //延時xms
{
uint x,y;
for(x=xms;x>0;x--)
for(y=90;y>0;y--);
}
void key()
{
if (key_1==0)
{
delayms(10);
if (key_1==0)
{
while(key_1==0);
if (shu<99) shu++;
}
}
if (key_2==0)
{
delayms(10);
if (key_2==0)
{
while(key_2==0);
if (shu>0) shu--;
}
}
}
void alarm()
{
ys++;
if (ys>20)
{
ys=0;
beep=!beep;
}
}
//////////////////////////////////////////主函數///////////////////////////////////////////////////////////
void main(void)
{
uint m,n;
uint i;
delayms(1000);
TMOD=0X15; //T0外部計數工作方式1 T1定時方式1
EA=0; //開總中斷
ET1=0; //關閉T1
TH0=0;
TL0=0;
TH1=(65536-50000)/256; //裝初值
TL1=(65536-50000)%256; //裝初值
init_1602();
WRITE_LCD1602_COM(0x80+3); // 顯示地址
for(i=0; i<6; i++)
{
WRITE_LCD1602_DAT(Show0[i]);
delayms(5);
}
WRITE_LCD1602_COM(0x80+12); // 顯示地址
for(i=0;i<2;i++)
{
WRITE_LCD1602_DAT(Show1[i]);
delayms(5);
}
WRITE_LCD1602_COM(0xc0+3); // 顯示地址
WRITE_LCD1602_byte("Limit:");
WRITE_LCD1602_COM(0xc0+12); // 顯示地址
for(i=0;i<2;i++)
{
WRITE_LCD1602_DAT(Show1[i]);
delayms(5);
}
EA=1;
ET1=1; //開T1
TR1=1; //T1開始定時
TR0=1; //T0開始計數
while(1)
{
key();
WRITE_LCD1602_COM(0xc0+9);
WRITE_LCD1602_DAT(0x30+(shu+31)/100%10);
WRITE_LCD1602_DAT(0x30+(shu+31)/10%10);
WRITE_LCD1602_DAT(0x30+(shu+31)%10);
i=0;
if(count==0)
continue;
while(count>Countnum[i])
{
i++;
}
m=i;
i=0;
WRITE_LCD1602_COM(0x80+9);
for(n=0; n<3; n++)
{
WRITE_LCD1602_DAT(dB[m][n]);
delayms(5);
}
WRITE_LCD1602_COM(0xc0+9);
WRITE_LCD1602_DAT(0x30+(shu+31)/100%10);
WRITE_LCD1602_DAT(0x30+(shu+31)/10%10);
WRITE_LCD1602_DAT(0x30+(shu+31)%10);
if(m>=shu)
{
alarm();
}else
{
beep=1;
}
}
}
void Timer0() interrupt 1
{
z++;
}
void Timer1() interrupt 3
{
TR1=0; //關閉T1定時
TH1=(65536-50000)/256;
TL1=(65536-50000)%256;
t++;
if(t==20) //定時1s時間到
{
t=0;
TR0=0; //T0停止計數
c=z*65535+(TH0*256+TL0); // 將計數值讀取
TH0=0; //清空計數值
TL0=0; //清空計數值
TR0=1; //T0開始計數
count=c;
c=0;
z=0;
}
TR1=1; //T1開始定時
}
</font>

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