关于AN3275的问题 except, Memory

xujicai

下面的这段代码来自AN3275，作者想擦除Paged Memory of the block 0（except the page 0x3F）：
------------------------------------------------------------------------------------------------------------------------------
PPAGE=0x3E;
  li16PageAddressPointer=0xBFFF;
  li16BootAddressPointer = 0xFFFF;
  while(PPAGE>li8Page)
  {
    if(*(uint8 *)(li16BootAddressPointer) != *(uint8 *)(li16PageAddressPointer))
    {
     /*
      * Erase Paged Memory
      */
      gi32FlashAddressH = PPAGE;
      for(gi32FlashAddressL=0xBF00;gi32FlashAddressL>=0x8000;gi32FlashAddressL-=0x200){
        gi16FlashDataCounter = 1;
        if (vfnFlash_Cmd(FErase))
        {
          vfnSCITxMsg(&gi8aFlashErrorMsg[0]);
          return;
        }
      }
      PPAGE--;
      li16PageAddressPointer = 0xC000;
      li16BootAddressPointer = 0x0000;
    }
    li16BootAddressPointer--;
    li16PageAddressPointer--;
    if(li16BootAddressPointer<0xF000){PPAGE = 0x36;}
  }
------------------------------------------------------------------------------------------
不过我认为下面的这些代码就足可以了：
----------------------------------------------------------------------------------------------------
PPAGE=0x3E;
  while(PPAGE>li8Page)
  {
      gi32FlashAddressH = PPAGE;
      for(gi32FlashAddressL=0xBF00;gi32FlashAddressL>=0x8000;gi32FlashAddressL-=0x200){
        gi16FlashDataCounter = 1;
        if (vfnFlash_Cmd(FErase))
        {
          vfnSCITxMsg(&gi8aFlashErrorMsg[0]);
          return;
        }
      }
      PPAGE--;
   }
---------------------------------------------------------------------------------------------------------------
请教一下，作者多出的那些代码有什么用途呢， thanks！

venus8654

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