使用单片机实现闹钟功能-优快云博客

本文链接：https://blog.youkuaiyun.com/root_robot/article/details/52551312

这篇博客详细介绍了如何利用延时函数在单片机上实现一个实用的闹钟功能，涵盖了从基本的时钟原理到具体编程实现的步骤。

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延时函数：

void delay_us(unsigned char t)
{
    while(--t);
}

void delay_ms(unsigned char t)
{
    while(t--)
		{
        delay_us(245);
			  delay_us(245);
    }
}

void delay_s(unsigned char t)
{
    while(t--)
    {
		    delay_ms(200);	
			  delay_ms(200);
			  delay_ms(200);
			  delay_ms(200);
			  delay_ms(200);
    }
}

主文件函数：
#include <reg52.h>
#include "./delay/delay.h"

#define PORTLEN P0
#define KEYPORT P1

sbit bit_select = P2^0;
sbit seg_select = P2^1;
sbit beem = P3^2;

unsigned char code SONG_TONE[]={239,239,212,189,159,159,189,159,159,142,126,120,120,159,120,120,142,159,189,142,159,189,239,212,189,159,142,159,189,212,239};
unsigned char code SONG_LONG[]={6,6,9,3,6,6,12,6,6,6,6,6,6,12,6,6,9,3,6,6,9,3,6,3,3,6,3,3,6,6,9};
unsigned char src[16] = {0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71};
unsigned char qrc[8] = {0xfe,0xfd,0xfb,0xf7,0xef,0xdf,0xbf,0x7f};
unsigned char second1[8];
unsigned char shi = 0;
unsigned char fen = 0;
unsigned char miao = 0;
unsigned char Dshi = 3;
unsigned char Dfen = 1;
unsigned char Dmiao = 0;
unsigned char j = 7;
unsigned char k = 0;

void timer0_init(void)
{
EA = 1;
TMOD |= 0x01;
TH0 = (65536 - 20000) / 256;
TL0 = (65536 - 20000) % 256;
ET0 = 1;
TR0 = 1;
}

void timer1_init(void)
{
EA = 1;
TMOD |= 0x10;
TH1 = (65536 - 1000) / 256;
TL1 = (65536 - 1000) % 256;
ET1 = 1;
TR1 = 1;
}

unsigned char key_scan(void)
{
unsigned char keyvalue;
KEYPORT = 0xf0;
if(0xf0 != KEYPORT)
{
delay_ms(10);
if(0xf0 != KEYPORT)
{
KEYPORT = 0xfe;
if(0xfe != KEYPORT)
{
keyvalue = KEYPORT;
keyvalue &= 0xf0;
keyvalue += 0x0e;
while(0xfe != KEYPORT);
delay_ms(10);
while(0xfe != KEYPORT);
return keyvalue;
}
KEYPORT = 0xfd;
if(0xfd != KEYPORT)
{
keyvalue = KEYPORT;
keyvalue &= 0xf0;
keyvalue += 0x0d;
while(0xfd != KEYPORT);
delay_ms(10);
while(0xfd != KEYPORT);
return keyvalue;
}
}
}
return 0xff;
}

unsigned char key_pro()
{
unsigned char keynum;
keynum = key_scan();
switch(keynum)
{
case 0x7e:return 1;break;
case 0xbe:return 2;break;
case 0xde:return 3;break;
case 0xee:return 4;break;
case 0x7d:return 5;break;
case 0xbd:return 6;break;
case 0xdd:return 7;break;
case 0xed:return 8;break;
default:return 0xff;break;
}
}

void PlayMusic(void)
{
unsigned char q=0;

unsigned char m;
unsigned char k;
while(SONG_LONG[q]!=0||SONG_TONE[q]!=0)
{
for(m=0;m<SONG_LONG[q]*20;m++)
{
beem=~beem;
for(k=0;k<SONG_TONE[q]/3;k++);
}
delay_ms(10);
q++;
}
}

void main()
{
unsigned char key;
timer1_init();
timer0_init();
while(1)
{
key = key_pro();
if(1 == key)
{
while(1 != key);
delay_ms(10);
while(1 != key);
TR0 = ~TR0;
}

if(2 == key)
{
while(2 != key);
delay_ms(10);
while(2 != key);
shi++;
second1[0] = src[shi / 10];
second1[1] = src[shi % 10];
second1[2] = 0x40;
if(24 == shi)
{
shi = 0;
}
}
if(3 == key)
{
while(3 != key);
delay_ms(10);
while(3 != key);
fen++;
second1[3] = src[fen / 10];
second1[4] = src[fen % 10];
second1[5] = 0x40;
if(60 == fen)
{
fen = 0;
}
}
if(4 == key)
{
while(4 != key);
delay_ms(10);
while(4 != key);
miao++;
second1[6] = src[miao / 10];
second1[7] = src[miao % 10];
if(60 == miao)
{
miao = 0;
}
}
if(5 == key)
{
while(5 != key);
delay_ms(10);
while(5 != key);
second1[0] = src[Dshi / 10];
second1[1] = src[Dshi % 10];
second1[2] = 0x40;
second1[3] = src[Dfen / 10];
second1[4] = src[Dfen % 10];
second1[5] = 0x40;
second1[6] = src[Dmiao / 10];
second1[7] = src[Dmiao % 10];
}
if(6 == key)
{
while(6 != key);
delay_ms(10);
while(6 != key);
Dshi++;
second1[0] = src[Dshi / 10];
second1[1] = src[Dshi % 10];
if(24 == Dshi)
{
Dshi = 0;
}
}
if(7 == key)
{
while(7 != key);
delay_ms(10);
while(7 != key);
Dfen++;
second1[3] = src[Dfen / 10];
second1[4] = src[Dfen % 10];
if(24 == Dfen)
{
Dfen = 0;
}
}
if(8 == key)
{
while(8 != key);
delay_ms(10);
while(8 != key);
Dmiao++;
second1[6] = src[Dmiao / 10];
second1[7] = src[Dmiao % 10];
if(24 == Dmiao)
{
Dmiao = 0;
}
}
if((shi == Dshi) && (fen == Dfen) && (miao == Dmiao))
{
beem = 0;
PlayMusic();
delay_ms(500);
}
}
}
void display()
{
static unsigned char i = 0;
PORTLEN = 0x0; //ÏûÖØÓ°
seg_select = 1;
seg_select = 0;

PORTLEN = 0xff;
bit_select = 1;
bit_select = 0;

PORTLEN = second1[i];
seg_select = 1;
seg_select = 0;

PORTLEN = qrc[i];
bit_select = 1;
bit_select = 0;

i++;
if(8 == i)
{
i = 0;
}

}

void timer0_isr() interrupt 1
{
static unsigned char i = 0;
TH0 = (65536 - 20000) / 256;
TL0 = (65536 - 20000) % 256;

i++;
if(50 == i)
{
i = 0;
miao++;
if(60 == miao)
{
miao = 0;
fen++;
if(60 == fen)
{
fen = 0;
shi++;
if(24 == shi)
{
shi = 0;
}
}
}
}
second1[0] = src[shi / 10];
second1[1] = src[shi % 10];
second1[2] = 0x40;
second1[3] = src[fen / 10];
second1[4] = src[fen % 10];
second1[5] = 0x40;
second1[6] = src[miao / 10];
second1[7] = src[miao % 10];
}

void timer1_isr() interrupt 3
{
TH1 = (65536 - 1000) / 256;
TL1 = (65536 - 1000) % 256;
display();
}

时钟四：实现闹钟