面包板+单片机简易测心率制作(代码+详解)多动手，相信一次会比一次好，继续努力 -

#include<reg52.h>
#define LCD_DB P0
unsigned long int fre;
unsigned char time;
unsigned char Flag0;
unsigned char Flag1;
unsigned char Flag2;
unsigned char count;
unsigned char kai;
sbit LCD_RS=P2^6;
sbit LCD_RW=P2^5;
sbit LCD_E=P2^7;
sbit key_0=P3^1;
sbit key_1=P3^0;
sbit key_2=P3^2;
sbit key_3=P3^3;
sbit beep=P2^0;
unsigned char character[10]={0};
unsigned char character_1[]={"Heart Rate "};
unsigned char character_2[]={"upper "};
unsigned char character_3[]={"lower "};
void displaym();
void displaym1();
void LCD_init(void);
void LCD_write_command(unsigned char command);
void LCD_write_data(unsigned char dat);
void LCD_disp_char(unsigned char x,unsigned char y,unsigned char dat);
void delay_n(unsigned int n);
void clocktimer_init();
//--------------------------------------------------------------延时
void delay_n(unsigned int n)//延时函数
{
unsigned int i;
unsigned char j;
for(i=n;i>0;i--)
for(j=0;j<2;j++);
}
//--------------------------------------------------------------液晶显示
void LCD_init(void)//液晶初始化函数
{
LCD_write_command(0x38);
LCD_write_command(0x38);
LCD_write_command(0x38);
LCD_write_command(0x0c);
LCD_write_command(0x06);
LCD_write_command(0x01);
delay_n(100);
}
void LCD_write_command(unsigned char dat)//液晶写命令函数
{
LCD_DB=dat;
LCD_RS=0;
LCD_RW=0;
LCD_E=1;
LCD_E=0;
delay_n(1);
}
void LCD_write_data(unsigned char dat)//液晶写数据函数
{
LCD_DB=dat;
LCD_RS=1;
LCD_RW=0;
LCD_E=1;
LCD_E=0;
delay_n(1);
}
void LCD_disp_char(unsigned char x,unsigned char y,unsigned char dat)//液晶显示一个字符
{
unsigned char address;
if(y==1)
address=0x80+x;
else
address=0xc0+x;
LCD_write_command(address);
LCD_write_data(dat);
}
void LCD_disp_num(unsigned char x,unsigned char y,unsigned char dat)//显示一个数字
{
unsigned char address;
if(y==1)
address=0x80+x;
else
address=0xc0+x;
LCD_write_command(address);
LCD_write_data(dat+48);
}
void dis_num(void)
{
unsigned char i=0,j=0,k=0;
LCD_write_command(0x01);
character[0] = fre/1000;
character[1] = fre/100%10;
character[2] = fre/10%10;
character[3] = fre%10;
for(i = 0;i<10;i++)
{
LCD_disp_char(i+0,1,character_1[i]);
}
for(i = 0;i<4;i++)
{
if(character[i]!=0)
break;
}
k=4-i;
for(j = 0;j<k;j++)
{
if(fre>40&&fre<120)
LCD_disp_num(12+j,1,character[i++]);
}
if(Flag0==1)
{
for(i = 0;i<5;i++)
{
LCD_disp_char(i+0,2,character_2[i]);
}
displaym();
}
if(Flag0==2)
{
for(i = 0;i<5;i++)
{
LCD_disp_char(i+0,2,character_3[i]);
}
displaym1();
}
}
//-------------------------------------------------------------定时/计数器初始化
void clocktimer_init(void)
{
TMOD=0x60;//计数器0和计数器1赋初值初始化
TL1=0;
TR1=1;
ET1=1;
RCAP2H=(65536-60000)/256;
RCAP2L=(65536-60000)%256;
TH2=RCAP2H;
TL2=RCAP2L;
ET2=1;
TR2=1;
EA=1;
}
void clock1(void) interrupt 3 //计数器1中断
{
count++;
}
void timer2(void) interrupt 5 //定时器2中断
{
time++;
TF2=0;
if (time==200)
{
time=0;
EA=0;
fre=(count*256+TL1)*4;
TL1=0;
TH1=0;
count=0;
EA=1;
}
}
void key_scan()
{
if(key_0==0)
{
delay_n(50);
if(key_0==0)
{
while(key_0==0);
Flag0++;
while(Flag0>2)
Flag0=0;
}
}
if(key_1==0)
{
delay_n(100);
if(key_1==0)
{
if(Flag0==1)
{
Flag1++;
dis_num();
}
if(Flag0==2)
{
Flag2++;
dis_num();
}
}
}
if(key_2==0)
{
delay_n(100);
if(key_2==0)
{
if(Flag0==1)
{
Flag1--;
dis_num();
}
if(Flag0==2)
{
Flag2--;
dis_num();
}
}
}
if(key_3==0)
{
delay_n(100);
if(key_3==0)
{
while(key_3==0);
kai=1-kai;
}
}
}
void displaym()
{
LCD_write_command(0xc6);
if(Flag1/200%10!=0)
{
LCD_write_data(Flag1/200%10+0x30);
}
else
{
LCD_write_data(' ');
}
if(Flag1/200%10==0&&Flag1/20%10==0)
{
LCD_write_data(' ');
}
else
{
LCD_write_data(Flag1/20%10+0x30);
}
LCD_write_data(Flag1/2%10+0x30);
}
void displaym1()
{
LCD_write_command(0xc6);
if(Flag2/200%10!=0)
{
LCD_write_data(Flag2/200%10+0x30);
}
else
{
LCD_write_data(' ');
}
if(Flag2/200%10==0&&Flag2/20%10==0)
{
LCD_write_data(' ');
}
else
{
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