请问有人告诉我为什么我必须定义它吗？

我正在从BMMUSUBKITK-01黑客代码。在Eng.C文件或KEY .C文件中，EpApktz大小似乎没有任何定义或定义，但该项目构建得很好。当我将代码剪切并粘贴到项目中时，在生成过程中会发现一个错误（称为EpApPKTyStand）是未定义的。
当我将其定义为UIT16（每个数据表为UBFSX Load in Enter（）；API（8）作为值时，我可以得到大部分项目的工作（实际上，我所看到的一切）……
但是，有人告诉我为什么我必须定义它吗？或者，告诉我在BMM代码里我应该看什么？
谢谢！
tim Miner（又名TDGM）



     以下为原文
  I am hacking code from BMM_USB_KIT-001. There does not appear to be a definition or #define for EP_PKT_SIZE anywhere in the main.c file or the Key.c file and yet that project builds just fine. When I cut and paste that code into my project, I get an error during the build that says it (EP_PKT_SIZE) is undefined.
    When I define it as a uint16 (per the datasheet for the USBFS_LoadInEP(); API)(and assign 8 as the value, I can get most of the project working (actually, everything I have looked at so far)...
    BUT, Would someone tell me why I had to define it?OR, tell me where I should have looked in the BMM code?
    Thanks a TON!
    Tim Miner (aka TDGM)