单片机==矩阵键盘-逻辑键值（11）

#include <reg52.h>
#include "delay.h"

#define KEYPORT P0
#define SEGPORT P1

sbit seg_select = P2^1;
sbit bit_select = P2^0;

unsigned char segdata[16] = {0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71};
unsigned char bitdata[8] = {0xfe,0xfd,0xfb,0xf7,0xef,0xdf,0xbf,0x7f};
unsigned char tempdata[2] = {0x3f,0x3f};

void timer0_init(void)
{
EA = 1;
TMOD |= 0x01;
TH0 = (65536 - 10000) / 256;
TL0 = (65536 - 10000) % 256;
ET0 = 1;
TR0 = 1;
}

void display()
{
static unsigned char i = 0;

SEGPORT = 0x0;
seg_select = 1;
seg_select = 0;

SEGPORT = 0xff;
bit_select = 1;
bit_select = 0;

SEGPORT = tempdata[i];
seg_select = 1;
seg_select = 0;

SEGPORT = bitdata[i];
bit_select = 1;
bit_select = 0;

i++;
if(2 == i)
{
i = 0;
}
}

void timer0_isr(void) interrupt 1
{
TH0 = (65536 - 10000) / 256;
TL0 = (65536 - 10000) % 256;
display();
}

unsigned char key_scan(void)
{
unsigned char keyvalue;
KEYPORT = 0xf0;
if(0xf0 != KEYPORT)
{
delay_ms(10);
if(0xf0 != KEYPORT)
{
KEYPORT = 0xfe;
if(0xfe != KEYPORT)
{
keyvalue = KEYPORT;
keyvalue &= 0xf0;
keyvalue += 0x0e;
while(0xfe != KEYPORT);
delay_ms(10);
while(0xfe != KEYPORT);
return keyvalue;
}
KEYPORT = 0xf7;
if(0xf7 != KEYPORT)
{
keyvalue = KEYPORT;
keyvalue &= 0xf0;
keyvalue += 0x07;
while(0xf7 != KEYPORT);
delay_ms(10);
while(0xf7 != KEYPORT);
return keyvalue;
}
KEYPORT = 0xfd;
if(0xfd != KEYPORT)
{
keyvalue = KEYPORT;
keyvalue &= 0xf0;
keyvalue += 0x0d;
while(0xfd != KEYPORT);
delay_ms(10);
while(0xfd != KEYPORT);
return keyvalue;
}
KEYPORT = 0xfb;
if(0xfd != KEYPORT)
{
keyvalue = KEYPORT;
keyvalue &= 0xf0;
keyvalue += 0x0b;
while(0xfb != KEYPORT);
delay_ms(10);
while(0xfb != KEYPORT);
return keyvalue;
}

}
}
return 0xff;
}

unsigned char key_pro()
{
unsigned char keynum;
keynum = key_scan();
switch(keynum)
{
case 0x7e : return 0;break;
case 0xbe : return 1;break;
case 0xde : return 2;break;
case 0xee : return 3;break;
case 0x7d : return 4;break;
case 0xbd : return 5;break;
case 0xdd : return 6;break;
case 0xed : return 7;break;
case 0x7b : return 8;break;
case 0xbb : return 9;break;
case 0xdb : return 10;break;
case 0xeb : return 11;break;
case 0x77 : return 12;break;
case 0xb7 : return 13;break;
case 0xd7 : return 14;break;
case 0xe7 : return 15;break;
default : return 16;break;
}
}

void main()
{
unsigned char key;
timer0_init();
while(1)
{
key = key_pro();
if(16 != key)
{
tempdata[0] = segdata[key / 10];
tempdata[1] = segdata[key % 10];
}
}
}