51单片机数码管显示电子时钟这个程序什么意思？

#include
#include

unsigned char data dis_digit;
unsigned char key_s, key_v;
unsigned char sec100; //定义这个是干什么的？

unsigned char code table[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,
                     0x07,0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71};
unsigned char data dis_buf[8];
unsigned char data dis_index;
unsigned char hour,min,sec;

***it K1 = P3^4;
***it K2 = P3^5;
***it dula=P2^6;
***it wela=P2^7;
bit scan_key();    //子函数什么意思
void proc_key();    //子函数什么意思
void inc_sec();
void inc_min();
void inc_hour();
//void display();
void delay(unsigned char ms);
void display1(unsigned char a1,unsigned char a2,unsigned char a3,unsigned char a4,unsigned char a5,unsigned char a6);
void main(void)
{
P0 = 0xff;
P2 = 0xff;
TMOD = 0x11;
TH1 = 0xdc;
TL1 = 0;

TH0 = 0xFC;
TL0 = 0x17;

hour = 12;
min = 00;
sec = 00;

sec100 = 0;

dis_buf[0] = hour / 10;
dis_buf[1] = hour % 10;
dis_buf[3] = min / 10;
dis_buf[4] = min % 10;
dis_buf[6] = sec / 10;
dis_buf[7] = sec % 10;
// dis_buf[2] = 0xbf;
// dis_buf[5] = 0xbf;

dis_digit = 0xfe;
dis_index = 0;

TCON = 0x01;
IE = 0x8a;
TR1 = 1;

key_v = 0x03;

while(1)
{
if(scan_key())
{
delay(10);
if(scan_key())
{
key_v = key_s;
proc_key();
}
}
display1(dis_buf[0],dis_buf[1],dis_buf[3],dis_buf[4],dis_buf[6],dis_buf[7]);
}
}

bit scan_key()
{
key_s = 0x00;
key_s |= K2;
key_s <<= 1;
key_s |= K1;
return(key_s ^ key_v);
}

void proc_key()
{
EA = 0;
if((key_v & 0x01) == 0) // K1
{
inc_hour();
}
else if((key_v & 0x02) == 0) // K2
{
min++;
if(min > 59)
{
min = 0;
}
dis_buf[3] = min / 10;
dis_buf[4] = min % 10;
}

EA = 1;
}

void timer1() interrupt 3
{
TH1 = 0xdc;

sec100++;

if(sec100 >= 100)
{
sec100 = 0;
inc_sec();
}
}

void inc_sec()
{
sec++;
if(sec > 59)
{
sec = 0;
inc_min();
}
dis_buf[6] = sec / 10;
dis_buf[7] = sec % 10;
}

void inc_min()
{
min++;
if(min > 59)
{
min = 0;
inc_hour();
}
dis_buf[3] = min / 10;
dis_buf[4] = min % 10;
}

void inc_hour()
{
hour++;
if(hour > 23)
{
hour = 0;
}
if(hour > 9)
dis_buf[0] = hour / 10;
else
dis_buf[0] = 0x00;
dis_buf[1] = hour % 10;

}

void delay(unsigned char ms)

{
unsigned char i;
while(ms--)
{
for(i = 0; i < 120; i++);
}
}

void display1(unsigned char a1,unsigned char a2,unsigned char a3,unsigned char a4,unsigned char a5,unsigned char a6)
{
dula=0;
P0=table[a1]; //œ‘ æ∞ŸŒª
dula=1;
dula=0;

wela=0;
P0=0x7e;
wela=1;
wela=0;
delay(1);

dula=0;
P0=table[a2]; //œ‘ æ ÆŒª
dula=1;
dula=0;

wela=0;
P0=0x7d;
wela=1;
wela=0;
delay(1);

P0=table[a3]; //œ‘ æ∏ˆŒª
dula=1;
dula=0;

P0=0x7b;
wela=1;
wela=0;
delay(1);

P0=table[a4]; //œ‘ æ∏ˆŒª
dula=1;
dula=0;

P0=0x77;
wela=1;
wela=0;
delay(1);

P0=table[a5]; //œ‘ æ∏ˆŒª
dula=1;
dula=0;

P0=0xef;
wela=1;
wela=0;
delay(1);

P0=table[a6]; //œ‘ æ∏ˆŒª
dula=1;
dula=0;

P0=0xdf;
wela=1;
wela=0;
delay(1);

}

杨众

2020-3-5 23:56:57

sec是用来计数的，数到100为1秒，bit scan_key()函数是用来判断是否有按键按下的，无论K1或K2按下，或者两个按键一起按下都会返回1，但是这个函数不能判断具体是哪个按键被按下，所以需要void proc_key()函数来判断具体是哪个按键被按下，若K1被按下执行inc_hour()一次，小时hour 被加一，若K2被按下执行分钟min被加一。