为什么键盘输入后延时时间不对

恋空 · 发表于 2019-8-8 11:50:43

while(1)
{
num = KeyScan();
switch(num)
   {
      case 0:
m=m;
printf("D\n"); break;
case 1:
m=m;
printf("C\n"); break;
case 2:
m=m;
printf("B\n"); break;
case 3:
m=m;
printf("A\n"); break;
case 4:
                              m=m;
printf("#\n");
LED0=0;
delay_ms(5000);
LED0=1;
m=0;
break;
case 5:
m=m*10+9;
printf("9"); break;
case 6:
m=m*10+6;
printf("6"); break;

case 7:
m=m*10+3;
printf("3"); break;
case 8:
m=m*10+0;
printf("0"); break;
case 9:
m=m*10+8;
printf("8"); break;
   case 10:
m=m*10+5;
printf("5"); break;
case 11:
m=m*10+2;
printf("2"); break;
case 12:
m=0;
printf("*"); break;
   case 13:
m=m*10+7;
printf("7"); break;
case 14:
m=m*10+4;
printf("4"); break;
case 15:
m=m*10+1;
printf("1"); break;
}
当按下#键时，LED灯仅仅亮了两秒多，求解答。