D12 realize with the USB device port of the procedures and principles of

Packet : 103244834usb_d12.zip filelist
usb_d12/
usb_d12/PC与单片机USB(D12)数据通讯过程描述 (转).pdf
usb_d12/PC与单片机USB(D12)数据通讯过程描述.doc
usb_d12/PC与单片机USB_D12_数据通讯过程描述.pdf
usb_d12/PDIUSBD12_cn.pdf
usb_d12/USB枚举过程详述--梦想与现实的距离.pdf
usb_d12/文档 1.pdf

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