利用51单片机做一个简易时钟

void main()
{
bsp_init();
while(1)
{
TimeTim();              //正常时间在走
bsp_KeyScan();          //键盘扫描看哪个功能键被按下
bsp_KeyProc(keyvalue);  //根据键值进行相应的功能处理
SetValueShow();         //数码管上显示的值
ShowSegCC();            //显示在数码管上
bsp_CheckAlarm();       //闹钟检查
}
}

unsigned char hour = 2, min = 2, sec = 3;       //设置时间初值
unsigned char ahour = 0, amin = 0, asec = 0;    //设置闹钟初值
unsigned char time = 0;

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

void delay_ms(unsigned int t)   //t最大为255
{
while(t--)
{
delay_us(245);
delay_us(245);
}
}

void TimeTim()
{
if(settype == 0 && alarmvalue == 0)     //当不在闹钟状态也不在修改时间状态的时候时间正常走
{
if(count == 20)
{
count = 0;
sec++;
if(sec == 60)
{
sec = 0;
min++;
if(min == 60)
{
min = 0;
hour++;
if(hour == 24)
{
hour = 0;
}
}
}
}
}
}

//检查时间是否到了闹钟时间
void bsp_CheckAlarm(void)
{
if((hour == ahour) && (min == amin) && (sec == asec))
{
hour = 0;
min = 0;
sec = 0;
}
}

sbit SETTIME = P0^0;    //修改时间
sbit SETALARM = P0^1;   //设置闹钟
sbit INC = P0^2;        //加1
sbit DEC = P0^3;        //减1

unsigned char keyvalue = 0;
unsigned char settype = 0;      //0是初始状态正常显示，1是修改秒，2是修改分，3是修改时
unsigned char alarmvalue = 0;   //0是初始状态，1是修改秒，2是修改分，3是修改时

void bsp_KeyScan(void)
{
if(SETTIME == 0)//K1按键被按下
{
keyvalue = 1;
while(!SETTIME);//等待按键释放

}

if(SETALARM == 0)
{
keyvalue = 2;
while(!SETALARM);

}

if(INC == 0)
{
keyvalue = 3;
while(!INC);
}

if(DEC == 0)
{
keyvalue = 4;
while(!DEC);
}
}

void bsp_KeyProc(unsigned char keyv)
{
if(keyv == 1)
{
settype++;
if(settype == 4)
{
settype = 0;
}
keyvalue = 0;    //键值要清0！！！
}

if(keyv == 2)
{
alarmvalue++;
if(alarmvalue == 4)
{
alarmvalue = 0;
}
keyvalue = 0;
}

if(keyv == 3)
{
timeadd();
keyvalue = 0;
}

if(keyv == 4)
{
timedec();
keyvalue = 0;
}
}

void timeadd()
{
//设置时间加1
if(settype == 1)
{
if(sec < 59)
{
sec++;
}

else
{
sec = 0;
}
}

else if(settype == 2)
{
if(min < 59)
{
min++;
}

else
{
min = 0;
}
}

else if(settype == 3)
{
if(hour < 23)
{
hour++;
}

else
{
hour = 0;
}
}

//设置闹钟加1
if(alarmvalue == 1)
{
if(asec < 59)
{
asec++;
}

else
{
asec = 0;
}
}

else if(alarmvalue == 2)
{
if(amin < 59)
{
amin++;
}

else
{
amin = 0;
}
}

else if(alarmvalue == 3)
{
if(ahour < 23)
{
ahour++;
}

else
{
ahour = 0;
}
}
}

void timedec()
{

//设置时钟减1
if(settype == 1)
{
if(sec > 0)
{
sec--;
}

else
{
sec = 59;
}
}

else if(settype == 2)
{
if(min > 0)
{
min--;
}

else
{
min = 59;
}
}

else if(settype == 3)
{
if(hour > 0)
{
hour--;
}

else
{
hour = 23;
}
}

//设置闹钟减1
if(alarmvalue == 1)
{
if(asec > 0)
{
asec--;
}

else
{
asec = 59;
}
}

else if(alarmvalue == 2)
{
if(amin > 0)
{
amin--;
}

else
{
amin = 59;
}
}

else if(alarmvalue == 3)
{
if(ahour > 0)
{
ahour--;
}

else
{
ahour = 23;
}
}
}

#define SEGPORT P1
sbit WEI = P2^1;
sbit DUAN = P2^0;

unsigned char code TableCA[16]={0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90,0x88,0x83,0xc6,0xa1,0x86,0x8e};  //共阳数码管段选码表，无小数点
unsigned char code TableSel[8]={0xfe,0xfd,0xfb,0xf7,0xef,0xdf,0xbf,0x7f};//共阴数码管位选码表
unsigned char code TableCC[16]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71}; //共阴数码管段选码表，无小数点
unsigned char Show[8] = {0};
//unsigned int showvalue = 0;
//unsigned int time = 0;

void ShowSegCA(unsigned char t)
{
SEGPORT = TableCA[t];
}
//1到255显示
void ShowSegCC(void)
{
static unsigned char i = 0;

//消隐
SEGPORT = 0x00;
DUAN = 1;
DUAN = 0;

//选通位码
WEI = 1;
SEGPORT = TableSel[i];
WEI = 0;

//选通位码
DUAN = 1;
SEGPORT = Show[i];
DUAN = 0;

i++;
if(i == 8)
{
i = 0;
}
delay_ms(1);
}

void SetValueShow(void)
{
if(alarmvalue == 0) //当不在闹钟状态时数码管显示正常的时间
{
Show[0] = TableCC[hour/10];
if(settype == 3)
Show[1] = TableCC[hour%10] | 0x80;
else
Show[1] = TableCC[hour%10];
Show[2] = 0x40;
Show[3] = TableCC[min/10];
if(settype == 2)
Show[4] = TableCC[min%10] | 0x80;
else
Show[4] = TableCC[min%10];
Show[5] = 0x40;
Show[6] = TableCC[sec/10];
if(settype == 1)
Show[7] = TableCC[sec%10] | 0x80;
else
Show[7] = TableCC[sec%10];
}

//在闹钟状态数码管显示闹钟设置的时间
else
{
Show[0] = TableCC[ahour/10];
if(alarmvalue == 3)
Show[1] = TableCC[ahour%10] | 0x80;
else
Show[1] = TableCC[ahour%10];
Show[2] = 0x40;
Show[3] = TableCC[amin/10];
if(alarmvalue == 2)
Show[4] = TableCC[amin%10] | 0x80;
else
Show[4] = TableCC[amin%10];
Show[5] = 0x40;
Show[6] = TableCC[asec/10];
if(alarmvalue == 1)
Show[7] = TableCC[asec%10] | 0x80;
else
Show[7] = TableCC[asec%10];
}
}

unsigned char count = 0;
void Timer0_Init(void)
{
TMOD |= 0x01;
TH0 = (65536 - 50000)/256;
TL0 = (65536 - 50000)%256;
EA = 1;
ET0 = 1;
TR0 = 1;
}

void Timer0(void) interrupt 1
{
TH0 = (65536 - 50000)/256;
TL0 = (65536 - 50000)%256;
count++;
}