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#include<reg51.h>
sbit S1=P1^3;
sbit S2=P1^2;
sbit S3=P1^1;
sbit S4=P1^0;
#define uchar unsigned char
#define uint unsigned int
#define DAdata P0
uchar keyval;
void delay(unsigned char i)
{
TR0=1;
for( ;i>0;i--)
{
while (!TF0);
TF0=0;
TH0=0Xec;
TL0=0X78;
}
TR0=0;
}
void square()
{
DAdata=0xff;
delay(100);
DAdata=0x00;
delay(100);
}
void jieti(void)
{
DAdata=0x00;
delay(1);
DAdata=0x3f;
delay(1);
DAdata=0x7f;
delay(1);
DAdata=0xaf;
delay(1);
DAdata=0xff;
delay(1);
}
void saw(void)
{
int i;
for(i=0;i<255;i++)
DAdata=i;
}
void sanjiao()
{
int i;
for(i=0;i<255;i++)
DAdata=i;
for(i=255;i>0;i--)
DAdata=i;
}
void key(void)
{
if((P1&0x0f)!=0x0f)
delay(1);
if((P1&0x0f)!=0x0f)
{
if(S1==0)
keyval=1;
if(S2==0)
keyval=2;
if(S3==0)
keyval=3;
if(S4==0)
keyval=4;
}
}
void main()
{
keyval=0;
while(1)
{
key();
switch(keyval)
{
case 1 : square();
break;
case 2 : saw();
break;
case 3 : sanjiao();
break;
case 4 : jieti();
break;
}
}
} |
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