add a part of the usb stack

git-svn-id: https://rt-thread.googlecode.com/svn/trunk@2332 bbd45198-f89e-11dd-88c7-29a3b14d5316
This commit is contained in:
qiuyiuestc@gmail.com 2012-10-09 16:48:03 +00:00
parent 7f2731c666
commit 5c7fe30500

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