button_fretch.c

ARM嵌入式系统关于定时器基于c语言的实验代码

#include "register_variant.h"
#define KEY_VALUE (*(volatile unsigned char*)(switch_dummyAddress))
#define KEY_STATUS (*(volatile unsigned char*)(buttonStatus))

int button_statusFetch(void)
{
  /* char i=0,j=8,left_move=1;
   
   i = ~KEY_VALUE;
   if (i!=00)
     {
       for(;j>0;j--)
         if (i & 0x1) 
             break;
         else 
         {
            i=i>>1; 
            left_move ++;
           
         }
     }
 


*/


   
    return 0;

}