netcomm.lst

CP2201和51单片机实现ARP ICMP IP UDP协议

C51 COMPILER V7.06   NETCOMM                                                               12/04/2007 13:46:18 PAGE 1   


C51 COMPILER V7.06, COMPILATION OF MODULE NETCOMM
OBJECT MODULE PLACED IN netcomm.OBJ
COMPILER INVOKED BY: C:\Keil\C51\BIN\C51.EXE netcomm.c BROWSE DEBUG OBJECTEXTEND

stmt level    source

   1          
   2          
   3          unsigned int chksum(unsigned char xdata *check,unsigned int length) //计算校验和
   4          {
   5   1              unsigned long sum=0;
   6   1              unsigned int i;
   7   1              unsigned int xdata *ptr; 
   8   1               ptr=(unsigned int xdata *)check;
   9   1              for (i=0;i<(length)/2;i++)
  10   1              {
  11   2                      sum+=*ptr++;
  12   2              }
  13   1              if (length&0x01)//表示长度为单数
  14   1              {
  15   2                      sum=sum+((*ptr)&0xff00);
  16   2              }
  17   1              sum=(sum&0xffff)+((sum>>16)&0xffff);//高16位和低16位相加
  18   1              if(sum&0xffff0000)
  19   1              {//表示有进位
  20   2                      sum++;
  21   2              }
  22   1              return ( (unsigned int)((sum)&0xffff));
  23   1      //      return ( (UINT)(~((sum)&0xffff)));
  24   1      }
  25          
  26          unsigned int Swap16U(unsigned int data16u)
  27          {
  28   1              unsigned int    a;
  29   1              a = data16u >> 8;
  30   1              a += ((data16u & 0xFF) << 8);
  31   1              return  a;
  32   1      }
  33          


MODULE INFORMATION:   STATIC OVERLAYABLE
   CODE SIZE        =    219    ----
   CONSTANT SIZE    =   ----    ----
   XDATA SIZE       =   ----    ----
   PDATA SIZE       =   ----    ----
   DATA SIZE        =   ----       8
   IDATA SIZE       =   ----    ----
   BIT SIZE         =   ----    ----
END OF MODULE INFORMATION.


C51 COMPILATION COMPLETE.  0 WARNING(S),  0 ERROR(S)