Microsoft Windows USB Core Team Blog

Hi, this is Martin Borve from the USB team. In the previous blog, I gave a detailed description on how the device gets enumerated by the core USB stack and reported to the OS. In this post, I'm going to summarize which incorrect hardware behaviors during...

Hi, my name is Philip Ries and I'm also a developer on the USB core team. I'd like to tell you about the instrumentation that our team added to the USB core drivers for Windows 7, and how you can make use of this instrumentation. The USB Hub and USB...

Updated 7/12/2011 with Windows 7 SP1 format data (in addition to RTM format data) Hello, my name is Don Miller. I am a software developer on the Windows USB team. In this blog post, I'm going to describe how to get debug trace messages from WINUSB...

1 Introduction My name is Vivek Gupta; I am an engineer in Microsoft. I am part of the team that developed the USB 3.0 stack in Windows 8. USB 3.0 offers significant improvement in performance and power over USB 2.0. However, like any new technology...

Hello, my name is Martin Borve. I am a software developer on the Windows USB team. In this post I will provide a detailed description of the enumeration process used by the Windows 7 core USB driver stack - from the point the stack detects a presence...

When upgrading from Windows 7 RTM to SP1 on a clean Windows 7 RTM build, binaries such as usbport.sys, usbehci.sys and winusb.sys may not get updated. Machines that have INF files from OEMs to install USB drivers with a custom description will not get...

Hello, Today I’d like to share with you a change we are making to the Windows Logo Kit requirements for USB-IF testing. The requirements impacted are: Connect-0093: USB IF tests are passing or device is USB IF certified. (Effective June 1, 2011) Busport...

Hi, this is Vivek Gupta again from the USB team. In my last post on whether devices get reset on system resume, I talked about how some devices might get negatively impacted by the behavioral changes in USB core stack in Windows7. To make it easier for...

Hello, my name is Don Miller. I am a software developer on the Windows USB team. In this post my goal is to provide a USB end-user with a way to view the most recent USB public hotfixes for the below Windows releases: Windows 2000 Service Pack 4 ...

Hi, my name is Qiang Qiu. I work for USB core test team. I write USB device drivers and services to test USB core stack with DSF simulated EHCI controller, hub and different types of devices. I enjoy working on device drivers. In this article, I'm going...

Here are some common causes and solutions for users facing an "Unknown Device" problem. This post is a follow-up to Why is my USB device not detected or comes up as "Unknown Device"? . 1) The USB device is "hung". The USB device may have encountered...

 

Hello, my name is Yang You and I am a program manager for USB Diagnostics. One of the questions we often receive is: How do I use USB for kernel debugging for testing drivers and diagnosing system crashes.

There are several ways to debug Windows. You can use a COM/Serial port, a 1394/Firewire cable, or USB 2.0 debugging cable/port. Although, setting up USB debugging can take a bit more investment and time, USB might be the only externally exposed port that is capable of debugging on certain laptops and netbooks. There are some MSDN topics about: Setting Up a USB 2.0 Debug Cable Connection and Attaching to a Target Computer (Kernel Mode). The goal of this article is to provide step-by-step instructions about how to set up kernel debugging to use USB 2.0.

 

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Perhaps the most commonly encountered problem with USB devices is enumeration failure. If a USB device fails to enumerate successfully it will appear in Device Manager with a problem code of 43, and will be listed as an “Unknown Device” If Windows was...

There is a lot of news coming out of the BUILD conference this week. In the realm of USB, we've released preliminary documentation of the USB 3.0 core drivers. Check out new architectural diagrams and client driver interfaces! While we're at at it...

Updated 7/12/2011 with Windows 7 SP1 format data (in addition to RTM format data) Hello, my name is Don Miller. I am a software developer on the Windows USB team but also I am the developer responsible for the Windows 1394 driver stack. In this blog...

Authored by Eliyas Yakub [MSFT] and Qiang Qiu [MSFT] WinUSB is a Microsoft-provided kernel-mode client driver for USB devices. If you are developing a USB device for which Windows doesn’t include an in-box class driver, you can use Winusb.sys...

2012-10-23: This post is about USB 2.0 driver stack tracing. Many of the techniques here also apply to USB 3.0 driver stack tracing in Windows 8; for more information, see our recent blog post on USB 3.0 driver stack tracing . This is Philip Ries posting...

Hi, my name is Vivek Gupta. I am a developer on the USB team. In this article, I am going to discuss a behavioral change introduced in Windows7 USB core stack and how it affects USB devices. Old behavior: In Vista RTM, when the system resumed from...

Introduction to our team Hello and welcome to the Microsoft Windows USB core team blog. Microsoft Windows USB core team has the mission to design, develop and test the software stack that drives the USB Host Controllers and USB Hubs present on the...

  Hello, My name is Jane Lawrence and I am a program manager for USB Compatibility and USB Windows Logo Kit. In today’s blog post, I’ll be covering companion controllers. This content is targeted primarily towards hardware designers and chipset manufacturers...

How to determine whether a USB 3.0 device is operating at SuperSpeed? Note: The information provided in this blog post applies to Windows 8. Hi, I am Sanket Patel, a software developer on the USB team. In this blog post, I will describe some ways in which...

Hi, I’m Kristina Hotz, a Program Manager on the USB team. In this post, I’ll explain how you can create a container ID for a USB device by using the same mechanism as Windows 7. You will find the information useful if you are developing...

Authored by Philip Ries [MSFT] Windows 8 provides a USB driver stack to support USB 3.0 devices. The Microsoft-provided USB 3.0 driver stack consists of three drivers: Usbxhci.sys, Ucx01000.sys, and Usbhub3.sys. All three drivers work together to add...

Authored by Eliyas Yakub [MSFT] In this blog, I’ll answer some of the frequently asked questions about WinUSB and its support for SuperSpeed (USB 3.0) devices on Windows 8. WinUSB is a generic kernel-mode driver for USB devices. If you are developing...

This paper provides information about certain limitations of the Universal Serial Bus (USB) 2.0 selective suspend mechanism. It provides guidelines for independent hardware vendors (IHVs) and original equipment manufacturers (OEMs) to implement power...