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手册中只有OHCI，没有EHCI，这是为什么
架构图不全，看下面的寄存器就行
@awwwwa EHCI和OHCI是相互独立的吧？如果我只想使用EHCI，就不需要配置OHCI相关的寄存器吧？
@guoyao 是
@awwwwa 请问有USB的裸机驱动程序吗？可以发一份吗
@guoyao RT-Thread 推出过裸机HAL，https://github.com/RT-Thread/rt-thread/tree/master/bsp/allwinner/libraries/sunxi-hal/hal/source/usb
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