首先準(zhǔn)備材料吧：SEG數(shù)碼管4個(gè)共陰極（小編用的共陽(yáng)極的）、10k排阻（小編沒(méi)有直接做了個(gè)）、51單片機(jī)、按鈕、30p電容、12MHz晶振、10k電阻、10uf電容、插針、74ls245（小編用三極管代替了）。

成品圖

原理圖

主程序：

#include "Key.h"

#include "led.h"

uchar timeSetBuff[8]={'0','0',LED_MODE_COUNT,'0','0',LED_MODE_COUNT,'0','0'};//時(shí)鐘數(shù)據(jù)緩沖區(qū)

uchar alarmSetBuff[8]={'0','0',LED_MODE_ALARM,'0','0',LED_MODE_ALARM,'0','0'};//鬧鐘時(shí)間數(shù)據(jù)緩沖區(qū)

uchar timeDisMod=0x24; //00100100

uchar secondTemp,minuteTemp,hourTemp;

uchar secondAlarm,minuteAlarm,hourAlarm;

uchar timer0Temp;

uchar alarmKeyCount; //鬧鐘起停鍵計(jì)數(shù)

bit alarm_is_ok; //鬧鐘起停狀態(tài)

bit time_is_ok; //時(shí)間是否到

bit interface_mod; // 顯示界面模式，0為主時(shí)間界面，1為設(shè)置界面

/********************************************************************************************

* 函數(shù)名稱：定時(shí)器0

* 功 能：定時(shí)器0初始化

* 入口參數(shù)：無(wú)

* 出口參數(shù)：無(wú)

*********************************************************************************************/

void initTimer0(void) //定時(shí)10ms

{

TMOD |= 0x01; //GATE=0,TR=1運(yùn)行;C/T=1,counter,0,timer;01十六進(jìn)制

TH0 = 0xdc;

TL0 = 0x00;

TR0 = 1; //timer0 控制位，為1時(shí)啟動(dòng)timer0

ET0 = 1; //timer0 中斷使能

}

/********************************************************************************************

* 函數(shù)名稱：時(shí)鐘比較

* 功 能：比較時(shí)鐘和鬧鐘的時(shí)間緩沖區(qū)，只比較時(shí)和分

* 入口參數(shù)：無(wú)

* 出口參數(shù)：無(wú)

*********************************************************************************************/

void timeCompare(void)

{

if((minuteTemp == minuteAlarm) && (hourTemp == hourAlarm))

{

time_is_ok = 1;

alarm_is_ok = 0;

interface_mod = 1;

}

}

/********************************************************************************************

* 函數(shù)名稱：主函數(shù)

* 功 能：調(diào)用并執(zhí)行各個(gè)子函數(shù)

* 入口參數(shù)：無(wú)

* 出口參數(shù)：無(wú)

*********************************************************************************************/

void main()

{

uchar keyRead;

init_led();

init_key();

initTimer0();

timer0Temp = 0x00;

secondTemp = 0x00;

minuteTemp = 0x00;

hourTemp = 0x00;

secondAlarm = 0x00;

minuteAlarm = 0x00;

hourAlarm = 0x00;

alarmKeyCount = 0x02;

alarm_is_ok = 0; //默認(rèn)狀態(tài)停止

time_is_ok = 0; //默認(rèn)時(shí)間未到

interface_mod = 0;

sei();

while(1)

{

if(interface_mod == 1)

ledSweepDisplay(alarmSetBuff,timeDisMod);

else

ledSweepDisplay(timeSetBuff,timeDisMod);

if(alarm_is_ok == 1)

timeCompare();

keyRead = get_key_value();

if(keyRead == KEY_ALARM)

{

if(alarm_is_ok == 1 || time_is_ok == 1)

{

alarm_is_ok = 0;

time_is_ok = 0;

interface_mod = 0;

alarmKeyCount = 0x00;

}

else

{

if(alarmKeyCount

alarmKeyCount++;

else

alarmKeyCount = 0x00;

if(alarmKeyCount == 0x01)

interface_mod = 1;

if(alarmKeyCount == 0x02)

{

alarm_is_ok = 1;

interface_mod = 0;

}

}

}

if(keyRead == KEY_SECOND)

{ if(interface_mod == 1)

{

if(secondAlarm

secondAlarm++;

else

secondAlarm = 0x00;

alarmSetBuff[S_L] = secondAlarm % 10 + '0';

alarmSetBuff[S_H] = secondAlarm / 10 + '0';

}

else

{

if(secondTemp

secondTemp += 1;

else

secondTemp = 0x00;

timeSetBuff[S_L] = secondTemp % 10 + '0';

timeSetBuff[S_H] = secondTemp / 10 + '0';

}

}

if(keyRead == KEY_MINUTE)

{ if(interface_mod == 1)

{

if(minuteAlarm

minuteAlarm++;

else

minuteAlarm=0x00;

alarmSetBuff[M_L]=minuteAlarm%10+'0';

alarmSetBuff[M_H]=minuteAlarm/10+'0';

}

else

{

if(minuteTemp

minuteTemp += 1;

else

minuteTemp = 0x00;

timeSetBuff[M_L] = minuteTemp % 10 + '0';

timeSetBuff[M_H] = minuteTemp / 10 + '0';

}

}

if(keyRead == KEY_HOUR)

{

if(interface_mod == 1)

{

if(hourAlarm

hourAlarm++;

else

hourAlarm = 0x00;

alarmSetBuff[H_L] = hourAlarm % 10 + '0';

alarmSetBuff[H_H] = hourAlarm / 10 + '0';

}

else

{

if(hourTemp

hourTemp += 1;

else

hourTemp = 0x00;

timeSetBuff[H_L] = hourTemp%10+'0';

timeSetBuff[H_H] = hourTemp/10+'0';

}

}

}

}

/*， */

/********************************************************************************************

* 函數(shù)名稱：定時(shí)器0中斷函數(shù)

* 功 能：定時(shí)器0溢出中斷入口處,定時(shí)10ms

* 入口參數(shù)：無(wú)

* 出口參數(shù)：無(wú)

*********************************************************************************************/

void timer0_overflow(void) interrupt 1

{

TH0 = 0xdc;

TL0 = 0x00;

if(time_is_ok == 1) //報(bào)警

WARN_TRUMPET = ~WARN_TRUMPET;

if(timer0Temp

timer0Temp++;

else //進(jìn)中斷100次

{

timer0Temp = 0x00;

if(secondTemp

{

secondTemp++;

}

else

{

secondTemp = 0x00;

if(minuteTemp

minuteTemp++;

else

{

minuteTemp = 0x00;

if(hourTemp

hourTemp++;

else

hourTemp = 0x00;

}

}

}

timeSetBuff[S_L] = secondTemp%10+'0';

timeSetBuff[S_H] = secondTemp/10+'0';

timeSetBuff[M_L] = minuteTemp%10+'0';

timeSetBuff[M_H] = minuteTemp/10+'0';

timeSetBuff[H_L] = hourTemp%10+'0';

timeSetBuff[H_H] = hourTemp/10+'0';

sei();

}