89S52 use as the core of the USB keyboard to do, pay attention to modify the look and the windows device descriptor, such as treatment endpoint on the list. Used a 4* 4 small keyboard, has the number keys 0-9 10, Num Lock keys, Caps Lock key, Shift key, Ctrl key, Alt key, enter key and so on. Can have up to three keys pressed at the same time, if the intersection, then a maximum of only two keys pressed

USB键盘
.......\SourceCode
.......\..........\Key.c
.......\..........\Key.h
.......\..........\Key.LST
.......\..........\Key.OBJ
.......\..........\keyboard.h
.......\..........\My_type.h
.......\..........\PDIUSBD12.h
.......\..........\UART.c
.......\..........\UART.h
.......\..........\UART.LST
.......\..........\UART.OBJ
.......\..........\USB.H
.......\..........\UsbKeyBoard
.......\..........\UsbKeyBoard.c
.......\..........\UsbKeyBoard.hex
.......\..........\UsbKeyBoard.lnp
.......\..........\UsbKeyBoard.LST
.......\..........\UsbKeyBoard.M51
.......\..........\UsbKeyBoard.OBJ
.......\..........\UsbKeyBoard.Opt
.......\..........\UsbKeyBoard.plg
.......\..........\UsbKeyBoard.Uv2
.......\..........\UsbKeyBoard_Opt.Bak
.......\..........\UsbKeyBoard_Uv2.Bak
.......\解压说明.txt

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