#include <reg52.h>
unsigned char zimo[10]={0xc0,0xf9,0xa4,0xb0, // 0, 1, 2, 3
0x99,0x92,0x82,0xf8,0x80,0x90};// 4, 5, 6, 7, 8, 9
unsigned char disflag[4]={0xfe,0xfd,0xfb,0xf7};
unsigned char disbuf[4];
unsigned char n;
unsigned char flag;
unsigned char key;
unsigned char KeyDelaytime;
unsigned char Key_v;
unsigned char Keystate;
#define KEY_DELAY_TIME 10
#define KEY_IDEL 0x00
#define KEY_DELAY 0x01
#define WAIT_KEY_OPEN 0x02
sbit AN1 = P3^2;
sbit AN2 = P3^3;
void scan_key()
{
switch(Keystate)
{
case KEY_IDEL :
P3=0xff;
Key_v=AN1;
if((Key_v&0x01)==0)
{
Keystate=KEY_DELAY;
KeyDelaytime=0;
}
break;
case KEY_DELAY :
if(KeyDelaytime>=KEY_DELAY_TIME)
{
P3=0xff;
Key_v=AN1;
if((Key_v&0x01)==0)
{
key++;
if(key==6)key=0;
Keystate=WAIT_KEY_OPEN;
}
else
{
Keystate=KEY_IDEL;
}
}
break;
case WAIT_KEY_OPEN :
P3=0xff;
Key_v=AN1;
if(Key_v&0x01)Keystate=KEY_IDEL;
break;
}
}
int main()
{
unsigned char i;
P0 = 0xff;
P2 = 0xff;
TMOD = 0x01;
TH0 = 0xfc;
TL0 = 0x18;
IE = 0x82;
key=0;
flag=0;
n=0;
for(i=0;i<4;i++)
{
disbuf=zimo;
}
TR0=1;
while(1)
{
scan_key();
}
return 0;
}
void timer0(void) interrupt 1
{
TH0=0xfc;
TL0=0x18;
KeyDelaytime++;
if(flag<key+1)
{
P0=disbuf[n];
P2=disflag[n];
}
else
{
P2=0xff;
P0=0;
}
flag++;
if(flag==6)
{
n++;
if(n==4)
{
n=0;
}
flag=0;
}
}
来个我的程序,中断扫描6个数码管,可调节亮度.20MS扫描8个太慢了,肯定会出现闪烁的情况 |
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