碰到一个很好玩的问题、、高手进来看看咯

a959845298 · 发表于 2011-9-30 21:51:58

我只把代码的位置交换了一下却出现了不同的编译结果请看下面
unsigned char x=0;
   flag=0;
   unsigned char i,j,temp,tab[]={0xfe,0xfd, 0xfb,0xf7};
报告错误

   然后下面就可以通过
   unsigned char x=0;
   unsigned char i,j,temp,tab[]={0xfe,0xfd, 0xfb,0xf7};
   flag=0;

a959845298 · 发表于 2011-9-30 21:53:10

我的原程序中断查询键盘
#include <hidef.h>    /* common defines and macros */
#include "derivative.h"    /* derivative-specific definitions */

unsigned char a[]={0x3F,0x06,0x5B,0x4F,0x66,0x6D,0x7D,0x07,0x7F,0x6F ,0x77,0x7C,0x39,0x5E,0x79,0x71,0x76};
unsigned char flag;
void delay(unsigned char n)
{
  unsigned char j;
  for(j=1000;j>0;j--)
for(n;n>0;n--);
}

void main(void)
{
  TIOS_IOS0=0;
  TCTL4=0x01;
  TIE_C0I=1;//开通道0，上升沿捕捉
  DDRB=0xff;
  DDRK=0x0f;


  TSCR1_TEN=1;


EnableInterrupts;

  for(;;) {
_FEED_COP(); /* feeds the dog */
  } /* loop forever */
  /* please make sure that you never leave main */
}
#pragma CODE_SEG __NEAR_SEG NON_BANKED
void interrupt 8 tim0()
{
  DisableInterrupts;
  TFLG1_C0F=1;
  PORTK=0x0f;
  delay(5);
  if(PORTK&0xf0)
  {
   unsigned char x=0;
   unsigned char i,j,temp,tab[]={0xfe,0xfd, 0xfb,0xf7};
   flag=0;
   for(i=0;i<4;i++)
      {
      x=0;
      temp=0x01;
      PORTK=tab[i];
      delay(10);
      for(j=0;j<4;j++)
      {
         if(PORTK&temp)
            x=i*4+j;
         flag=1;
         break ;

      }
      temp=temp<<1;
      if(flag=1)
         {
            break;
         }

      }
   PORTB=a[x];

  }


  EnableInterrupts;

}