求帮忙看下为什么这个程序一开始流水灯从左到右循环后，别的按键都不起作用了

2019-03-24 18:06发布

#include<reg51.h>
#include<intrins.h>
#define GPI0_LED P0
#define GPI0_KEY P1
void Delay10ms(unsigned int c);
unsigned char Key_Scan();
void LED1();
void LED2();
void LED3();
void LED4();
void LED5();
void LED6();
void LED7();
void LED8();
void main(void)
{
unsigned char keyNum;
while(1)
{ keyNum=Key_Scan();
switch (keyNum)
   {
      case(0xEF):
         LED1();
         break;
case(0xDF):
         LED2();
         break;
case(0xBF):
         LED3();
         break;
case(0x7F):
         LED4();
         break;
case(0xFE):
         LED5();
   break;
case(0xFD):
         LED6();
   break;
case(0xFB):
         LED7();
   break;
case(0xF7):
         LED8();
   break;
dafault:
break;
   }
      }
}
unsigned char Key_Scan()
{    unsigned char keyValue=0,i;
      if (GPI0_KEY != 0xFF)
   {
      Delay10ms(1);
      if (GPI0_KEY != 0xFF)
   {
      keyValue=GPI0_KEY;
   i=0;
   while((i<50)&&(GPI0_KEY != 0xFF))
   {
      Delay10ms(1);
i++;
   }
}
   }
   return keyValue;
}
void Delay10ms(unsigned int c)
{unsigned char a,b;
for (;c>0;c--)
   {
      for (b=38;b>0;b--)
      {
   for (a=130;a>0;a--);
}
}
}
void LED1()
{
GPI0_LED=0x00;
Delay10ms(50);
GPI0_LED=0xFF;
Delay10ms(50);

}
void LED2()
{
GPI0_LED=0xCC;
Delay10ms(5);
GPI0_LED=0x33;
Delay10ms(5);
GPI0_LED=0xCC;
Delay10ms(5);
GPI0_LED=0x33;
Delay10ms(5);
}
void LED3()
{
GPI0_LED=0x99;
Delay10ms(5);
GPI0_LED=0x66;
Delay10ms(5);
GPI0_LED=0x99;
Delay10ms(5);
GPI0_LED=0x66;
Delay10ms(5);
}
void LED4()
{
GPI0_LED=0xAA;
Delay10ms(5);
GPI0_LED=0x55;
Delay10ms(5);
GPI0_LED=0xAA;
Delay10ms(5);
GPI0_LED=0x55;
Delay10ms(5);
}
void LED5()
{
LED1();
LED2();
LED3();
LED4();
}
void LED6()
{GPI0_LED=0xFE;
while(1)
{ Delay10ms(50);
   GPI0_LED=_crol_(P0,1);
}
}
void LED7()
{GPI0_LED=0x7F;
while(1)
{ Delay10ms(50);
   GPI0_LED=_cror_(P0,1);
}
}
void LED8()
{
GPI0_LED=0x00; 此帖出自小平头技术问答

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