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#include<reg52.h>
#define key_S 15 //宏定義短按/消抖(約15ms)
#define key_L key_S*35 //宏定義長(zhǎng)按(約500ms)
#define key_I key_S*27 //宏定義長(zhǎng)按連續(xù)+/-間隔(約120ms)
#define uint unsigned int
#define uchar unsigned char
sbit SER = P1^0; //數(shù)據(jù)輸入
sbit SCK = P1^1; //串行移位時(shí)鐘
sbit RCK = P1^2; //鎖存器時(shí)鐘
sbit key0 = P3^5;
sbit key1 = P3^6;
sbit key2 = P3^7;
uchar code table[]={//共陽(yáng)數(shù)碼管段碼"0~f-."
0xc0,0xf9,0xa4,0xb0,
0x99,0x92,0x82,0xf8,
0x80,0x90,0x88,0x83,
0xc6,0xa1,0x86,0x8e,0xbf,0x7f};
uchar data dis_buf[]={0,0,0xbf,0,0,0xbf,0,0};//顯示緩存
char sec=0,fen=0,shi=12;
uchar num=0,KeySec;
void delay_ms(uint z)
{
uint x,y;
for(x = z;x>0;x--)
for(y=115;y>0;y--);
}
void hc595(uchar Data)//74HC595的數(shù)據(jù)串入并出子程序
{
uchar i;
for(i=0;i<8;i++) //由高位到低位發(fā)送一個(gè)字節(jié)
{
Data<<=1; //左移一位，最高位溢出到位寄存器CY
SER=CY; //從位寄存器的進(jìn)位標(biāo)志位CY讀取
SCK = 0; //串行移位
SCK = 1;
}
RCK = 0; //鎖存
RCK = 1;
}
void key()
{
static unsigned int time=0;//計(jì)數(shù)變量
if(!key0||!key1||!key2)
{
time++;
if(time>key_L)//長(zhǎng)按有效
time=key_I;//連續(xù)+/-間隔
if(time==key_S)//短按消抖
{
if(!key0)//調(diào)整時(shí)、分、秒
{
KeySec++;
if(KeySec>3)
{
KeySec=0;
num=0;
}
}
}
if(time==key_S||time==key_L)//短按消抖或長(zhǎng)按連+/-
{
if(!key1 && KeySec!=0)//++
{
switch(KeySec)
{
case 1: shi++;if(shi>23)shi=0; break;
case 2: fen++;if(fen>59)fen=0; break;
case 3: sec++;if(sec>59)fen=0; break;
}
}
if(!key2 && KeySec!=0)//--
{
switch(KeySec)
{
case 1: shi--;if(shi<0)shi=23; break;
case 2: fen--;if(fen<0)fen=59; break;
case 3: sec--;if(sec<0)sec=59; break;
}
}
}
}
else time=0;
}
void display(void)
{
static uchar i=0;
dis_buf[0]=table[shi/10];
dis_buf[1]=table[shi%10];
dis_buf[3]=table[fen/10];
dis_buf[4]=table[fen%10];
dis_buf[6]=table[sec/10];
dis_buf[7]=table[sec%10];
P2=0xff; //段碼消隱
hc595(0x01<<i); //送位碼
if((KeySec==1 && i==1)||(KeySec==2 && i==4)||(KeySec==3 && i==7))
P2=dis_buf[i]&0x7f; //送段碼加點(diǎn)
else P2=dis_buf[i]; //送段碼不加點(diǎn)
i++;
i%=8;
}
void Timer0Init() //20毫秒@12.000MHz
{
TMOD= 0x01; //設(shè)置定時(shí)器模式
TL0 = 0xE0; //設(shè)置定時(shí)初值
TH0 = 0xB1; //設(shè)置定時(shí)初值
TF0 = 0; //清除TF0標(biāo)志
TR0 = 1; //定時(shí)器0開(kāi)始計(jì)時(shí)
EA = 1; //開(kāi)總中斷
ET0 = 1; //開(kāi)T0中斷
}
void main()
{
Timer0Init();
while(1)
{
key();
display();
delay_ms(1);//控制主循環(huán)周期約1ms
}
}
void timer0() interrupt 1
{
TL0 = 0xE0;
TH0 = 0xB1;
num++;
if(num>=50)
{
num=0;
sec++;
if(sec>=60)
{
sec=0;
fen++;
if(fen>=60)
{
fen=0;
shi++;
if(shi>=24)
{
shi=0;
}
}
}
}
}

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