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Drivers Usb free download - Drivers For Free, CopyTrans Drivers Installer, Adaptec ASPI Drivers, and many more programs. To verify that your driver is working, you should see a difference in the following pictures after plugging the CH340 to a USB port. To check that the CH340 enumerates to a COM port, you can open the device manager. You can click the Start or ⊞ (Windows) button and type 'device manager to quickly search for the application.

This section describes the device, hardware and compatible identifiers generated by USB devices.

Since the Windows operating system generates special USB identifiers for printer and mass storage devices, the following documentation divides USB identifiers into two groups:

For all USB devices, the USB bus driver generates a standard set of identifiers composed of values retrieved from the USB device and interface descriptors. Standard USB Identifiers are discussed in the first of the two sections indicated above. In addition to the standard USB identifiers, native Windows drivers for mass storage and printer devices generate a separate set of USB identifiers composed of information about special relevance to printers and storage devices. These special USB identifiers are discussed in the second section.

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Note Starting with Microsoft Windows 2000, the numbers that are embedded in USB identifiers is in hexadecimal format.

Purpose

This section describes Universal Serial Bus (USB) support in the Windows operating system, so that you can develop USB device drivers that are interoperable with Windows.

Where applicable

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USB devices are peripherals, such as mouse devices and keyboards, that are connected to a computer through a single port. A USB client driver is the software installed on the computer that communicates with the hardware to make the device function. If the device belongs to a device class supported by Microsoft, Windows loads one of the Microsoft-provided USB drivers (in-box class drivers) for the device. Otherwise, a custom client driver must be provided by the hardware manufacturer or a third party vendor. The user installs the client driver for the device when the device is first detected by Windows. After successful installation, Windows loads the client driver every time the device is attached and unloads the driver when the device is detached from the host computer.

You can develop a custom client driver for a USB device by using the Windows Driver Frameworks (WDF) or the Windows Driver Model (WDM). Instead of communicating with the hardware directly, most client drivers send their requests to the Microsoft-provided USB driver stack that makes hardware abstraction layer (HAL) function calls to send the client driver's request to the hardware. The topics in this section describe the typical requests that a client driver can send and the device driver interfaces (DDIs) that the client driver must call to create those requests.

Developer audience

A client driver for a USB device is a WDF or WDM driver that communicates with the device through DDIs exposed by the USB driver stack. This section is intended for use by C/C++ programmers who are familiar with WDM. Before you use this section, you should understand basic driver development. For more information, see Getting Started with Windows Drivers. For WDF drivers, the client driver can use Kernel-Mode Driver Framework (KMDF) or User-Mode Driver Framework (UMDF) interfaces designed specifically to work with USB targets. For more information about the USB-specific interfaces, see WDF USB Reference and UMDF USB I/O Target Interfaces.

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Development tools

The Windows Driver Kit (WDK) contains resources that are required for driver development, such as headers, libraries, tools, and samples.

USB programming reference

Gives specifications for I/O requests, support routines, structures, and interfaces used by USB client drivers. Those routines and related data structures are defined in the WDK headers.

Universal Serial Bus (USB) programming reference.

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USB driver samples

Use these samples to get started with USB client driver programming.

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Related standards and specifications

You can download official USB specifications from the Universal Serial Bus Documents website. This website contains links to the Universal Serial Bus Revision 3.0 Specification and the Universal Serial Bus Revision 2.0 specification.