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供學(xué)習(xí)用
#include <reg52.h>
sbit ENLED = P1^4;
sbit ADDR3 = P1^3;
sbit ADDR2 = P1^2;
sbit ADDR1 = P1^1;
sbit ADDR0 = P1^0;
sbit KeyIn1 = P2^4;
sbit KeyIn2 = P2^5;
sbit KeyIn3 = P2^6;
sbit KeyIn4 = P2^7;
sbit KeyOut1 = P2^3;
sbit KeyOut2 = P2^2;
sbit KeyOut3 = P2^1;
sbit KeyOut4 = P2^0;
unsigned char key=0;
void delay(unsigned int i)
{
while (i--);
}
unsigned char just_keys(unsigned char n)
{
if (KeyIn1 == 0)
{
delay (100);
if (KeyIn1 == 0)
{
while (KeyIn1 == 0);
return (1+4*n);
}
else
return 0;
}
if (KeyIn2 == 0)
{
delay (100);
if (KeyIn2 == 0)
{
while (KeyIn2 == 0);
return (2+4*n);
}
else
return 0;
}
if (KeyIn3 == 0)
{
delay (100);
if (KeyIn3 == 0)
{
while (KeyIn3 == 0);
return (3+4*n);
}
else
return 0;
}
if (KeyIn4 == 0)
{
delay (100);
if (KeyIn4 == 0)
{
while (KeyIn4 == 0);
return (4+4*n);
}
else
return 0;
}
return 0;
}
unsigned char scan_keys(void)
{
unsigned char key_val=0;
KeyOut1 = 0;
KeyOut2 = 1;
KeyOut3 = 1;
KeyOut4 = 1;
key_val = just_keys(0);
if (key_val)
return key_val;
KeyOut1 = 1;
KeyOut2 = 0;
KeyOut3 = 1;
KeyOut4 = 1;
key_val = just_keys(1);
if (key_val)
return key_val;
KeyOut1 = 1;
KeyOut2 = 1;
KeyOut3 = 0;
KeyOut4 = 1;
key_val = just_keys(2);
if (key_val)
return key_val;
KeyOut1 = 1;
KeyOut2 = 1;
KeyOut3 = 1;
KeyOut4 = 0;
key_val = just_keys(3);
if (key_val)
return key_val;
return 0;
}
unsigned char wait(unsigned int n)
{
while (n--)
{
key = scan_keys();
if (key)
return key;
}
return 0;
}
void show1(void)
{
unsigned char i;
key = 0;
while (1)
{
for (i=0; i<8; i++)
{
P0 = ~(1<<i);
if (wait(1000))
break;
}
if (key)
break;
}
}
void show2(void)
{
unsigned char i;
key = 0;
while (1)
{
for (i=0; i<8; i++)
{
P0 = (1<<i);
if (wait(1000))
break;
}
if (key)
break;
}
}
void show3(void)
{
unsigned char i;
key = 0;
while (1)
{
for (i=0; i<8; i++)
{
if (i < 7)
P0 = ~(3<<i);
else
P0 = ~(0x81);
if (wait(1000))
break;
}
if (key)
break;
}
}
void show4(void)
{
unsigned char i;
key = 0;
while (1)
{
for (i=0; i<8; i++)
{
P0 = ~(1<<i);
if (wait(500))
break;
}
if (key)
break;
}
}
void show5(void)
{
unsigned char i=0;
key = 0;
while (1)
{
P0 = i;
i++;
if (wait(300))
break;
}
}
void show6(void)
{
unsigned char i=0xFF;
key = 0;
while (1)
{
P0 = i;
i--;
if (wait(300))
break;
}
}
void show7(void)
{
unsigned char i;
key = 0;
while (1)
{
for (i=0; i<8; i++)
{
if (i < 7)
P0 = (3<<i);
else
P0 = (0x81);
if (wait(1000))
break;
}
if (key)
break;
}
}
void show8(void)
{
unsigned char i, j=0;
key = 0;
while (1)
{
for (i=0; i<8; i++)
{
j = (j<<1) + 1;
P0 = j;
if (wait(1000))
break;
}
for (i=0; i<8; i++)
{
j = (j<<1);
P0 = j;
if (wait(1000))
break;
}
if (key)
break;
}
}
void show9(void)
{
key = 0;
while (1)
{
P0 = 0xF0;
if (wait(1000))
break;
P0 = 0x0F;
if (wait(1000))
break;
}
}
void show10(void)
{
key = 0;
while (1)
{
P0 = 0xAA;
if (wait(1000))
break;
P0 = 0x55;
if (wait(1000))
break;
}
}
void show11(void)
{
key = 0;
while (1)
{
P0 = 0x7E;
if (wait(1000))
break;
P0 = 0x3C;
if (wait(1000))
break;
P0 = 0x18;
if (wait(1000))
break;
P0 = 0x00;
if (wait(1000))
break;
P0 = 0x18;
if (wait(1000))
break;
P0 = 0x3C;
if (wait(1000))
break;
}
}
void show12(void)
{
key = 0;
while (1)
{
P0 = 0x7E;
if (wait(1000))
break;
P0 = 0xBD;
if (wait(1000))
break;
P0 = 0xDB;
if (wait(1000))
break;
P0 = 0xE7;
if (wait(1000))
break;
P0 = 0xDB;
if (wait(1000))
break;
P0 = 0xBD;
if (wait(1000))
break;
}
}
void show13(void)
{
unsigned char i=0;
key = 0;
while (1)
{
P0 = i + (i<<4);
if (i == 15)
i = 0;
else
i++;
if (wait(1000))
break;
}
}
void show14(void)
{
unsigned char i;
key = 0;
while (1)
{
for (i=0; i<4; i++)
{
P0 = ~(1<<i) & ~(1<<(i+4));
if (wait(1000))
break;
}
if (key)
break;
}
}
void show15(void)
{
unsigned char i=15;
key = 0;
while (1)
{
P0 = i + (i<<4);
if (i == 0)
i = 15;
else
i--;
if (wait(1000))
break;
}
}
void show16(void)
{
key = 0;
while (1)
{
P0 = 0xA5;
if (wait(1000))
break;
P0 = 0x5A;
if (wait(1000))
break;
}
}
main()
{
ENLED = 0;
ADDR3 = 1;
ADDR2 = 1;
ADDR1 = 1;
ADDR0 = 0;
while (1)
{
switch (key)
{
case 1: show1(); break;
case 2: show2(); break;
case 3: show3(); break;
case 4: show4(); break;
case 5: show5(); break;
case 6: show6(); break;
case 7: show7(); break;
case 8: show8(); break;
case 9: show9(); break;
case 10: show10(); break;
case 11: show11(); break;
case 12: show12(); break;
case 13: show13(); break;
case 14: show14(); break;
case 15: show15(); break;
case 16: show16(); break;
default : show1();
}
}
}
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