单片机定时中断方式的键盘输入实验

ID:72519 · 发表于 2015-1-21 23:30

是用51hei单片机开发板电路图详见：http://www.51hei.com/f/51hei-5.pdf 的数码管部分，用2个74hc573 锁存，p0口作为数据口，注意图中要改一下p3.6和p3.7分别是段和位的锁存端口.P2口上面是按键 p1口上面是8个led灯.

#include<reg52.h>
#define uchar unsigned char
#define uint unsigned int
uchar code DIS_SEG7[16]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71};
uchar code DIS_BIT[8]={0xfe,0xfd,0xfb,0xf7,0xef,0xdf,0xbf,0x7f};
uchar code SKEY[16]={1,2,3,10,4,5,6,11,7,8,9,12,14,0,15,13};
uchar code act[4]={0xfe,0xfd,0xfb,0xf7};
sbit D=P3^6;
sbit V=P3^7;
//=======================
void delay(uint k)
{
uint data i,j;
for(i=0;i<k;i++){
for(j=0;j<121;j++)
{;}}
}
//==============
void delay10ms(void)
{
uint data i,j;
for(i=0;i<10;i++){
for(j=0;j<121;j++)
{;}}
}
//================
char scan_key(void)
{
uchar i,j,in,ini,inj;
bit find=0;
for(i=0;i<4;i++)
{
P1=act[i];
delay10ms();
in=P1;
in=in>>4;
in=in|0xf0;
for(j=0;j<4;j++)
{
if(act[j]==in)
{find=1;
inj=j;ini=i;
}
}
}
if(find==0)return-1;
return (ini*4+inj);
}
//=======================
void init(void)
{TMOD=0x01;
TH0=-(50000/256);
TL0=-(50000%256);
ET0=1;
TR0=1;
EA=1;
}
//=================
void main(void)
{
init();
D=1;P0=0xff;D=0;V=1;P0=0xfe;V=0;
while(1)
{
delay(5000);
}
}
//============
void time0(void) interrupt 1
{char c;
uchar key_value;
TH0=-(50000/256);
TL0=-(50000%256);
c=scan_key();
if(c!=-1)key_value=SKEY[c];
if(key_value==1){D=1;P0=0xff;D=0;V=1;P0=0xff;V=0;}
}

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