Jan 12, 2024 · This article describes a USB Request Block (URB) and provides information about how a USB client driver can use Windows Driver Model (WDM) routines to allocate, build, and …

Execution of an URB is inherently an asynchronous operation, i.e. the usb_submit_urb() call returns immediately after it has successfully queued the requested action. Transfers for one …

Apr 1, 2021 · The URB structure is used by USB client drivers to describe USB request blocks (URBs) that send requests to the USB driver stack. The URB structure defines a format for all …

Dec 26, 2017 · USB 请求块（USB request block，urb）是USB 设备驱动中用来描述与USB 设备通信所用的 基本载体和核心数据结构，非常类似于网络设备驱动中的sk_buff 结构体。

Apr 1, 2021 · The _URB_BULK_OR_INTERRUPT_TRANSFER structure is used by USB client drivers to send or receive data on a bulk pipe or on an interrupt pipe.

The function determines how much data it can send to the device based on the size of the write urb it has created (this size depends on the size of the bulk out end point that the device has). …

Basic concept or ‘What is an URB?’. How to get an URB? What has to be filled in? How to submit an URB? How to cancel an already running URB? What about the completion handler? How to …

* * Creates an urb for the USB driver to use, initializes a few internal * structures, increments the usage counter, and returns a pointer to it. * * If the driver want to use this urb for interrupt, …

Dec 14, 2021 · The process of associating an URB with an IRP, and sending the request to the USB driver stack is referred to as submitting an URB. To submit an URB, the client driver must …

This submits a transfer request, and transfers control of the URB describing that request to the USB subsystem. Request completion will be indicated later, asynchronously, by calling the …