K1键流水灯交替闪烁。
K2键流水灯从两边向中间移动闪烁。
K3键流水灯全部闪烁。
K4键流水灯从LED7到LED0流水闪烁。

单片机源程序如下:

#include

sbit S5=P1^4;

sbit S6=P1^5;

sbit S7=P1^6;

sbit S8=P1^7;

unsigned char keyval;

void key_scan(void);

void forward(void);

void backward(void);

void Alter(void);

void blink(void);

void led_delay(void);

void delay10ms(void);

void main(void)

{

keyval=0;

while(1)

{

key_scan();

switch(keyval)

{

case 5:Alter();

break;

case 6:forward();

break;

case 7:blink();

break;

case 8:backward();

break;

}

}

}

void key_scan(void)

{

P1=0xff;

if((P1&0xf0)!=0xf0)

{

delay10ms();

if(S5==0)

keyval=5;

if(S6==0)

keyval=6;

if(S7==0)

keyval=7;

if(S8==0)

keyval=8;

}

}

void Alter(void)

{

P3=0xaa;

led_delay();

P3=0x55;

led_delay();

}

void forward(void)

{

P3=0x7e;

led_delay();

P3=0xbd;

led_delay();

P3=0xdb;

led_delay();

P3=0xe7;

led_delay();

P3=0xe7;

led_delay();

P3=0xdb;

led_delay();

P3=0xbd;

led_delay();

P3=0x7e;

led_delay();

}

void blink(void)

{

P3=0xff;

led_delay();

P3=0x00;

led_delay();

}

void backward(void)

{

P3=0x7f;

led_delay();

P3=0xbf;

led_delay();

P3=0xdf;

led_delay();

P3=0xef;

led_delay();

P3=0xf7;

led_delay();

P3=0xfb;

led_delay();

P3=0xfd;

led_delay();

P3=0xfe;

led_delay();

}

void led_delay(void)

{

unsigned char i,j;

for(i=0;i<220;i++)

for(j=0;j<220;j++);

}

void delay10ms(void)

{

unsigned char i,j;

for(i=0;i<100;i++)

for(j=0;j<100;j++);

}