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USB 的代码
usb.asm
;*******************************************************************************************
; DS1620.asm - DS1620采集温度的主程序
;**************************************************************************
usb.opt
### uVision2 Project, (C) Keil Software
### Do not modify !
cExt (*.c)
aExt (*.s*; *.src; *.a*)
oExt (*.obj)
lExt (*.lib)
tExt (*.txt; *.h; *.inc)
pExt (*.plm)
CppX (*.cpp)
DaveTm {
usb.lst
C51 COMPILER V8.02 USB 05/24/2009 23:44:36 PAGE 1
C51 COMPILER V8.02, COMPILATION OF MODULE USB
OBJECT MODULE PLACED IN USB
usb.hex
:0A09BC000809000000000000000020
:1009A800900007740FF0E4F511D288C289D2B8D24A
:0409B800A8D2AF22F0
:100900008B168A178918751201751300751408E47F
:10091000F508C3E5089DE49C5028AB160518E518BA
:10092000AA
usb.lnp
"USB.obj"
TO "USB"
usb.plg
礦ision3 Build Log
Project:
D:\Program Files\Keil\USB\USB.uv2
Project File Date: 05/24/2009
Output:
usb.c
#include
/*
char *xdata a;
char xdata *a;
char data *xdata a;
上面3个指针，我概念比较混乱，看了书后也不是特别明白。还请高手帮忙给通俗地解释解释。谢谢！
xdata: 存储在外部RAM
data：存储在内部RAM
要存储的内容：
1.指针char *a指向的Byte串，2.指针本身
usb.h
/****************************************************************
NAME: usb.h
DESC: definitions(USB data structure) for USB setup operation.
Because It's h/w independent file, it may be us
usb.h
#ifndef __USB_H
#define __USB_H
#ifndef u8
#define u8 unsigned char
#endif
#ifndef u16
#define u16 unsigned short
#endif
#ifndef u32
#define u32 unsigned int
#endif
#ifndef s8
#define s8 char
#end