Type: Driver
File Name: api_composite_19700.zip
File Size: 20.9 MB
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Suppose that we want to implement a synchronous protocol over two endpoints where the host will always transmit data over a bulk OUT endpoint, prior to receiving data on an associated IN endpoint.

This protocol requires only a single thread that handles OUT and IN transactions in order on that endpoint. This optimization is not without risk.


Using a single thread per endpoint naturally caters to the situation where the host program was aborted and restarted between the OUT and IN transaction. In this case, the sequence of transactions seen on the device will be When optimized away to a program that sequentially consumes OUT and IN in order, this program must be written so that at any time it may expect the protocol to reset. The third point enables a further optimization. A single thread can deal with all bulk traffic on all interfaces, optimizing multiple endpoints into a single thread Fig.

The single thread receives a request IN or OUT on any endpoint, dealing with that request, whereupon it API Composite USB Device on to the next request, possibly on a different endpoint.

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If the next request arrives before the last request has been dealt with completely, the USB device library sends NAKs, temporarily holding up the host. This optimization has one disadvantage, which is that the single thread must keep state for each endpoint and is effectively context switching on each request. We will show an example of this API Composite USB Device.

Multiple endpoints can be optimized into a single thread. The same API Composite USB Device cannot be applied to isochronous endpoints. If we had a single thread dealing with all isochronous data, it would involve FIFOs for each endpoint from which the thread will read data or post data. These FIFOs will increase latency, which is often undesirable.

The rest of this article discusses two examples of the software architecture and optimizations. JTAG Over USB For debugging programs on embedded processors, it is common to use a protocol such as JTAG for accessing API Composite USB Device internal state of the processor and to use a program such as gdb to run on a PC to interpret and modify state, set breakpoints, single step, and so on. These devices are often called JTAG keys. Hence, the descriptor labels them as vendor-specific, and it is up to us to define an endpoint structure that is fit for purpose. One endpoint structure would use six endpoints: Figure 4 shows a suitable software architecture for the device-end. Given that all endpoints are for bulk traffic, they can all be mapped onto a single thread and have two separate threads to deal with the state machines for JTAG traffic and UART traffic.

API Composite USB Device Driver

Figure 5 shows a sample implementation. The Audio The number of channels, API Composite USB Device rate, and sample depth can be varied to support anything from low-channel-count consumer devices to high-quality, high-channel-count professional audio.


Devices that are more complex also API Composite USB Device supported. The descriptor has a syntax for describing mixers, volume controls, equalizers, clocks, resampling, MIDI, and many other functions, although not all of those functions are recognized by all operating systems. On the host side, all USB traffic carrying audio samples is directed to the USB-Audio driver, which interacts through some general kernel sound interface with the program using audio, such as Skype.

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Other data, such as MIDI, can be handled through a separate interface by a separate driver. If the application has to support MIDI, stereo in, and stereo out with a clock controlled by the device, then the standard dictates that there shall be seven endpoints: Note that there are two API Composite USB Device oscillators: The vast majority of the transfers will have 12 samples, but sometimes there will be 13 or 11 samples. The device uses the third isochronous endpoint to inform the host of the current speed. Locate and expand Other device in the right pane.

WinUsb API calls for Composite device

This will launch the Hardware Update Wizard. Select Browse my computer for driver software and click Next. Click Browse and locate the USB driver folder.


Select Device Manager in the left pane of the Computer Management window. Locate and expand Android Phone in the right pane. Select Install from a list or specific location and click Next. Select Search for the best driver in these locations; uncheck Search removable media; and check Include this location in the search. To execute it, you will also require some files on the host side. To API Composite USB Device the Windows driver for the device only if you do not use the Microsoft OS Descriptorsuse the. To execute the example application, you will also require a custom executable application on the host side.

API Composite USB Device At least one of the defines should be enabled at any time. API Composite USB drivers were collected from official websites of manufacturers and other trusted sources. Official driver packages will help you to restore your. Download the latest drivers for your API Composite USB Device to keep your Computer up-to-date.

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