usb 子设备程序 支持sd卡 mouse keyboard 的最单单的驱动程序 gcc编译 支持-usb device supports sub-sd card only the mouse keyboard driver support for gcc compiler

host usb 主设备程序 支持sd卡 mouse keyboard 的最单单的驱动程序 gcc编译-the main host usb device supports sd card mouse keyboard alone most of the gcc compiler driver