Drivers Amoi Port Devices



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The WaveRT port driver combines the simplicity of the previous WaveCyclic port driver with the hardware-accelerated performance of the WavePci port driver.

The WaveRT port driver eliminates the need to continually map and copy audio data by providing its main client (typically, the audio engine) with direct access to the data buffer. This direct access also eliminates the need for the driver to manipulate the data in the audio stream. The WaveRT port driver thus accommodates the needs of the direct memory access (DMA) controllers that some audio devices have.

To distinguish itself from other wave-render and wave-capture devices, the WaveRT port driver registers itself under KSCATEGORY_REALTIME in addition to KSCATEGORY_AUDIO, KSCATEGORY_RENDER and KSCATEGORY_CAPTURE. This self-registration occurs during the installation of the adapter driver.

In Windows Vista and later operating systems, when the operating system starts and the audio engine is initialized, the audio engine enumerates the KS filters that represent the audio devices. During the enumeration, the audio engine instantiates the drivers for the audio devices that it finds. This process results in the creation of filter objects for these devices. For WaveRT audio devices, the resulting filter object has the following components:

  • An instance of the WaveRT port driver to manage the generic system functions for the filter

  • An instance of the WaveRT miniport driver to handle all the hardware-specific functions of the filter

After the filter object is created, the audio engine and the WaveRT miniport driver are ready to open an audio stream for the type of audio processing needed. To prepare the KS filter for audio rendering (playback), for example, the audio engine and the WaveRT miniport driver do the following to open a playback stream:

  1. The audio engine opens a pin on the KS filter, and the WaveRT miniport driver creates an instance of the pin. When the audio engine opens the pin, it also passes the wave format of the stream to the driver. The driver uses the wave format information to select the proper buffer size in the next step.

  2. The audio engine sends a request to the miniport driver for a cyclic buffer of a particular size to be created. The term cyclic buffer refers to the fact that when the buffer position register reaches the end of the buffer in a playback or record operation, the position register can automatically wrap around to the beginning of the buffer. Unlike the WaveCyclic miniport driver that sets up a contiguous block of physical memory, the WaveRT miniport driver does not need a buffer that is contiguous in physical memory. The driver uses the KSPROPERTY_RTAUDIO_BUFFER property to allocate space for the buffer. If the hardware of the audio device cannot stream from a buffer of the requested size, the driver works within the resource limitations of the audio device to create a buffer that is the closest in size to the originally requested size. The driver then maps the buffer into the DMA engine of the audio device and makes the buffer accessible to the audio engine in user-mode.

  3. The audio engine schedules a thread to periodically write audio data to the cyclic buffer.

  4. If the hardware of the audio device does not provide direct support for cyclic buffers, the miniport driver periodically reprograms the audio device to keep using the same buffer. For example, if the hardware does not support buffer looping, the driver must set the DMA address back to the start of the buffer each time it reaches the end of the buffer. This update can be done in either an interrupt service routine (ISR) or a high-priority thread.

The resulting configuration supplies a glitch-resilient audio signal on audio device hardware that either supports cyclic buffers or works with the miniport driver to regularly update its hardware.

To prepare a KS filter for audio capture (recording), the audio engine and the WaveRT miniport driver use similar steps to open a record stream.

One of the performance improvements provided by the WaveRT port driver is a reduction in the delay in the end-to-end processing of the audio stream during wave-render or wave-capture. This delay is referred to as stream latency.

For more information about these two types of stream latency, see the following topics.

For information about how to develop a WaveRT miniport driver that complements the WaveRT port driver, see the Developing a WaveRT Miniport Driver topic.

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If you are developing on Windows and want to connect a device for testing,then you need to install the appropriate USB driver. This pageprovides links to the web sites for several original equipment manufacturers (OEMs),where you can download the appropriate USB driver for your device.

If you're developing on Mac OS X or Linux, then you shouldn't need a USB driver.Instead read Using Hardware Devices.

To connect and debug with any of the Google Nexus devices using Windows, youneed to install the Google USB driver.

Install a USB driver

First, find the appropriate driver for your device from the OEM driverstable below.

Drivers Amoi Port Devices Download

Once you've downloaded your USB driver, follow the instructions below to install or upgrade thedriver, based on your version of Windows and whether you're installing for the first timeor upgrading an existing driver. Then see Using Hardware Devices forother important information about using an Android device fordevelopment.

Caution:You may make changes to android_winusb.inf file found insideusb_driver (for example, to add support for other devices),however, this will lead to security warnings when you install or upgrade thedriver. Making any other changes to the driver files may break the installationprocess.

Windows 10

To install the Android USB driver on Windows 10 for the first time, do the following:

Drivers Amoi Port Devices Kvm

  1. Connect your Android device to your computer's USB port.
  2. From Windows Explorer, open Computer Management.
  3. In the Computer Management left pane, select Device Manager.
  4. In the Device Manager right pane, locate and expand Portable Devices or Other Devices, depending on which one you see.
  5. Right-click the name of the device you connected, and then select Update Driver Software.
  6. In the Hardware Update wizard, select Browse my computer for driver software and click Next.
  7. Click Browse and then locate the USB driver folder. For example, the Google USB Driver is located in android_sdkextrasgoogleusb_driver.
  8. Click Next to install the driver.

Windows 8.1

Devices

To install the Android USB driver on Windows 8.1 for the first time, do the following:

  1. Connect your Android device to your computer's USB port.
  2. Access search, as follows:

    Touch screen: On your computer, swipe in from the right edge of the screen and tap Search.

    Using a mouse: Point to the lower-right corner of the screen, move the mouse pointer up, and then click Search.

  3. In the search box, type into and then click Device Manager.
  4. Double-click the device category, and then double-click the device you want.
  5. Click the Driver tab, click Update Driver, and follow the instructions.

Windows 7

To install the Android USB driver on Windows 7 for the first time, do the following:

  1. Connect your Android device to your computer's USB port.
  2. Right-click on Computer from your desktop or Windows Explorer, and select Manage.
  3. Select Devices in the left pane.
  4. Locate and expand Other device in the right pane.
  5. Right-click the device name (such as Nexus S) and select Update Driver Software. This will launch the Hardware Update Wizard.
  6. Select Browse my computer for driver software and click Next.
  7. Click Browse and locate the USB driver folder. (The Google USBDriver is located in android_sdkextrasgoogleusb_driver.)
  8. Click Next to install the driver.

Or, to upgrade an existing Android USB driver on Windows 7 and higher with the newdriver:

Drivers Amoi Port DevicesDrivers
  1. Connect your Android device to your computer's USB port.
  2. Right-click on Computer from your desktop or Windows Explorer, and select Manage.
  3. Select Device Manager in the left pane of the Computer Management window.
  4. Locate and expand Android Phone in the right pane.
  5. Right-click on Android Composite ADB Interface and select Update Driver. This will launch the Hardware Update Wizard.
  6. Select Install from a list or specific location and click Next.
  7. Select Search for the best driver in these locations; uncheckSearch removable media; and check Include this location in thesearch.
  8. Click Browse and locate the USB driver folder. (The Google USBDriver is located in android_sdkextrasgoogleusb_driver.)
  9. Click Next to upgrade the driver.

Get OEM drivers

OEMDriver URL
Acer http://www.acer.com/worldwide/support/
alcatel one touch http://www.alcatelonetouch.com/global-en/support/
Asus https://www.asus.com/support/Download-Center/
Blackberry https://swdownloads.blackberry.com/Downloads/entry.do?code=4EE0932F46276313B51570F46266A608
Dell http://support.dell.com/support/downloads/index.aspx?c=us&cs=19&l=en&s=dhs&~ck=anavml
Fujitsu http://www.fmworld.net/product/phone/sp/android/develop/
HTC http://www.htc.com/support
Huawei http://consumer.huawei.com/en/support/index.htm
Intel http://www.intel.com/software/android
Kyocera http://www.kyocera-wireless.com/support/phone_drivers.htm
Lenovo http://support.lenovo.com/us/en/GlobalProductSelector
LGE http://www.lg.com/us/support/software-firmware
Motorola https://motorola-global-portal.custhelp.com/app/answers/detail/a_id/88481/
MTK http://online.mediatek.com/Public%20Documents/MTK_Android_USB_Driver.zip (ZIP download)
Samsung http://developer.samsung.com/galaxy/others/android-usb-driver-for-windows
Sharp http://k-tai.sharp.co.jp/support/
Sony Mobile Communications http://developer.sonymobile.com/downloads/drivers/
Toshiba http://support.toshiba.com/sscontent?docId=4001814
Xiaomi http://www.xiaomi.com/c/driver/index.html
ZTE http://support.zte.com.cn/support/news/NewsDetail.aspx?newsId=1000442

If you don't see a link for the manufacturer of your device here, go to the support section of the manufacturer's website and search for USB driver downloads for your device.