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#include <reg52.h>
#include "lcd1602.h"
#define uchar unsigned char
#define uint unsigned int
sbit SPK =P1^7;
sbit lcdrs=P2^7;
sbit lcdrw=P2^6 ;
sbit lcden=P2^5 ;
unsigned char num=0,timecount=0,displayOK=0,rate=0;
unsigned int time[6]={0};
/***********************1ms延時(shí)函數(shù)*****************************/
void delay_1ms(uint q)
{
uint i,j;
for(i=0;i<q;i++)
for(j=0;j<110;j++);
}
void main()
{
init_1602();
TCON=0x01;//設(shè)置外部中斷0
EX0=1;
TMOD=0x01;//定時(shí)器0初始化
TH0=(65536-50650)/256;//實(shí)測(cè)每50ms中斷的定時(shí)值
TL0=(65536-50650)%256;
ET0=1;//開(kāi)定時(shí)器中斷
//顯示基本文字
write_string(1,0," Heart Rate ");
write_string(2,0," /min ");
TR0=0;//定時(shí)器停止
EA=1;//開(kāi)總中斷
while(1)
{
if(displayOK==1)
{
rate=60000/(time[1]/5+time[2]/5+time[3]/5+time[4]/5+time[5]/5);
write_sfm3_18B20(2,5,rate);
}
else
{
write_string(2,5," ");
}
delay_1ms(300);
}
}
void ex0() interrupt 0
{
EX0=0;//暫時(shí)關(guān)外部中斷
if(timecount<8) //當(dāng)連續(xù)兩次檢測(cè)時(shí)間間隔小于8*50ms=400ms不處理
{
TR0=1;//開(kāi)定時(shí)器
}
else
{
time[num]=timecount*50+TH0*0.256+TL0/1000;//算出間隔時(shí)間
TL0=(65536-50650)%256;//重新設(shè)置定時(shí)器
TH0=(65536-50650)/256;
timecount=0;//50ms計(jì)數(shù)清零
num++;
if(num==6)//記錄到超過(guò)等于6次時(shí)間
{
num=1;//計(jì)數(shù)從1開(kāi)始
displayOK=1; //測(cè)得5次開(kāi)始顯示
}
}
EX0=1;
}
void et0() interrupt 1
{
TL0=(65536-50650)%256;
TH0=(65536-50650)/256;
……………………
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