USB设备侧驱动程序分为三个层次:USB设备控制器(UDC)、Gadget Function API以及Gadget Function驱动程序。UDC驱动程序直接访问硬件,控制USB设备和主机间的底层通信,向上层提供与硬件相关操作的回调函数,Gadget Function API是UDC驱动程序回调函数的简单包装,Gadget Function驱动程序具体控制USB设备功能的实现,使设备表现出“网...
13、s booted.What is USBFSUSBFS is afilesystem specifically designed for USB devices, by default thisfilesystem gets mounted when the system is booted and it can be foundat /proc/bus/usb/. This filesystem consists of information about allthe USB devices that are connected to the computer....
function驱动 —— 实现各种usb class功能 udc驱动 —— 实现usb controller driver 辅助驱动 —— configfs.c实现用户空间配置usb, composite.c实现复合设备 进入function目录,可以看到各种已经实现的function,接下来我们要用到的serial function也在其中。 3)了解具体如何开启usb串口的功能。其实很简单,要开启usb seria...
802* the "usbfs" filesystem. This lets devices provide ways to 803* expose information touser space regardless of where they 804* do (or don't) showup otherwise in the filesystem. 805*@suspend: Called when the device is going to be suspended by the system. 806*@resume: Called when ...
注意到每一个目录下面都有一个Kconfig文件和一个Makefile,这很重要.稍后会有介绍. 而我们的故事其实是围绕着drivers/usb/storage这个目录来展开的.实际上这里边的代码清清楚楚地展示了我们日常频繁接触的U盘是如何工作的,是如何被驱动起来的.但是这个目录里边的冬冬并不是生活在世外桃源,他们总是和外面的世界有着千...
USBFS(USBfilesystem). Its Cross-platform Beauty of Libusb lies in its cross platform functionality. Driver written for one platform could be easily ported onto another platform with little or no changes, currently following operating systems are supported by Libusb. ...
注意到每一个目录下面都有一个Kconfig文件和一个Makefile,这很重要.稍后会有介绍. 而 我们的故事其实是围绕着drivers/usb/storage这个目录来展开的.实际上这里边的代码清清楚楚地展示了我们日常频繁接触的U盘是如何工作 的,是如何被驱动起来的.但是这个目录里边的冬冬并不是生活在世外桃源,他们总是和外面的世界有着...
* Mass storage * Function filesystem [M] USB Gadget precomposed configurations [M] Mass storage Gadget 然后编译内核会生成以下三个ko文件:drivers/usb/gadget/libcomposite.ko,drivers/usb/gadget/legacy/g_mass_storage.ko, drivers/usb/gadget/function/usb_f_mass_storage.ko, 需要將此三个文件复制到到roo...
When building your kernel,make sure to configureinFunctionFS:Device Drivers->USBSupport->USBGadget Support->USBGadget Driver->Function Filesystem 设置正确的 USB vendor ID 和 Product ID 这个设置能够放在 bootcmd 或者载入内核模块的时候通过參数传递: ...
[*] Function filesystem (FunctionFS) [ ] MTP gadget [*] Uevent notification of Gadget state [*] Audio Class 1.0[ ] Audio Class 2.0[ ] MIDI function [*] HID function [*] USB Webcam function [*] Printer function 2.配置USB Gadget模式为rndis ...