Drivers C-motech USB Devices

| 21-04-2021
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Usb driver download - Best answers Download usb driver - Best answers Spvd-012.1 usb driver for windows 10 - Forum - Drivers. On your Windows PC, you might experience a problem with a USB device like a printer, a camera, a keyboard, or a flash drive. To troubleshoot common USB-related issues, see the following resources. Import and manage all your photos. Fix USB-C problems. Error: “USB Device not recognized” when you try to access a USB external hard drive.

Locate Universal Serial Bus Controllers Apple Mobile Device USB Driver. It is also possible the device may show under Imaging Devices, Portable Devices, Other Devices or as an MTB USB Device. Right-click and select Update Driver Software. Unknown Device Identifier, free download. Driver identifier software for Windows: Identify unknown devices in your system and search for workable drivers. Includes tests and PC download for 32-bit/64-bit systems. To access a USB device, start by creating a skeleton app based on the WinUSB template included in the integrated environment of Windows Driver Kit (WDK) (with Debugging Tools for Windows) and Microsoft Visual Studio.You can use the template as a starting point.

Summary

  • Opening the device and obtaining WinUSB handle.
  • Getting information about the device, configuration, and interface settings of all interfaces, and their endpoints.
  • Reading and writing data to bulk and interrupt endpoints.

Important APIs

This topic includes a detailed walkthrough of how to use WinUSB Functions to communicate with a USB device that is using Winusb.sys as its function driver.

If you are using Microsoft Visual Studio 2013, create your skeleton app by using the WinUSB template. In that case, skip steps 1 through 3 and proceed from step 4 in this topic. The template opens a file handle to the device and obtains the WinUSB handle required for subsequent operations. That handle is stored in the app-defined DEVICE_DATA structure in device.h.

For more information about the template, see Write a Windows desktop app based on the WinUSB template.

Note WinUSB functions require Windows XP or later. You can use these functions in your C/C++ application to communicate with your USB device. Microsoft does not provide a managed API for WinUSB.

Prerequisites

The following items apply to this walkthrough:

  • This information applies to Windows 8.1, Windows 8, Windows 7, Windows Server 2008, Windows Vista versions of Windows.
  • You have installed Winusb.sys as the device's function driver. For more information about this process, see WinUSB (Winusb.sys) Installation.
  • The examples in this topic are based on the OSR USB FX2 Learning Kit device. You can use these examples to extend the procedures to other USB devices.

Step 1: Create a skeleton app based on the WinUSB template

To access a USB device, start by creating a skeleton app based on the WinUSB template included in the integrated environment of Windows Driver Kit (WDK) (with Debugging Tools for Windows) and Microsoft Visual Studio.You can use the template as a starting point.

For information about the template code, how to create, build, deploy, and debug the skeleton app, see Write a Windows desktop app based on the WinUSB template.

The template enumerates devices by using SetupAPI routines, opens a file handle for the device, and creates a WinUSB interface handle required for subsequent tasks. For example code that gets the device handle and opens the device, see Template code discussion.

Step 2: Query the Device for USB Descriptors

Next, query the device for USB-specific information such as device speed, interface descriptors, related endpoints, and their pipes. The procedure is similar to the one that USB device drivers use. However, the application completes device queries by calling WinUsb_GetDescriptor.

The following list shows the WinUSB functions that you can call to get USB-specific information:

  • Additional device information.

    Call WinUsb_QueryDeviceInformation to request information from the device descriptors for the device. To get the device's speed, set DEVICE_SPEED (0x01) in the InformationType parameter. The function returns LowSpeed (0x01) or HighSpeed (0x03).

  • Interface descriptors

    Call WinUsb_QueryInterfaceSettings and pass the device's interface handles to obtain the corresponding interface descriptors. The WinUSB interface handle corresponds to the first interface. Some USB devices, such as the OSR Fx2 device, support only one interface without any alternative setting. Therefore, for these devices the AlternateSettingNumber parameter is set to zero and the function is called only one time. WinUsb_QueryInterfaceSettings fills the caller-allocated USB_INTERFACE_DESCRIPTOR structure (passed in the UsbAltInterfaceDescriptor parameter) with information about the interface. For example, the number of endpoints in the interface is set in the bNumEndpoints member of USB_INTERFACE_DESCRIPTOR.

    For devices that support multiple interfaces, call WinUsb_GetAssociatedInterface to obtain interface handles for associated interfaces by specifying the alternative settings in the AssociatedInterfaceIndex parameter.

  • Endpoints

    Call WinUsb_QueryPipe to obtain information about each endpoint on each interface. WinUsb_QueryPipe populates the caller-allocated WINUSB_PIPE_INFORMATION structure with information about the specified endpoint's pipe. The endpoints' pipes are identified by a zero-based index, and must be less than the value in the bNumEndpoints member of the interface descriptor that is retrieved in the previous call to WinUsb_QueryInterfaceSettings. The OSR Fx2 device has one interface that has three endpoints. For this device, the function's AlternateInterfaceNumber parameter is set to 0, and the value of the PipeIndex parameter varies from 0 to 2.

    To determine the pipe type, examine the WINUSB_PIPE_INFORMATION structure's PipeInfo member. This member is set to one of the USBD_PIPE_TYPE enumeration values: UsbdPipeTypeControl, UsbdPipeTypeIsochronous, UsbdPipeTypeBulk, or UsbdPipeTypeInterrupt. The OSR USB FX2 device supports an interrupt pipe, a bulk-in pipe, and a bulk-out pipe, so PipeInfo is set to either UsbdPipeTypeInterrupt or UsbdPipeTypeBulk. The UsbdPipeTypeBulk value identifies bulk pipes, but does not provide the pipe's direction. The direction information is encoded in the high bit of the pipe address, which is stored in the WINUSB_PIPE_INFORMATION structure's PipeId member. The simplest way to determine the direction of the pipe is to pass the PipeId value to one of the following macros from Usb100.h:

    • The USB_ENDPOINT_DIRECTION_IN (PipeId) macro returns TRUE if the direction is in.
    • The USB_ENDPOINT_DIRECTION_OUT(PipeId) macro returns TRUE if the direction is out.

    The application uses the PipeId value to identify which pipe to use for data transfer in calls to WinUSB functions, such as WinUsb_ReadPipe (described in the 'Issue I/O Requests' section of this topic), so the example stores all three PipeId values for later use.

The following example code gets the speed of the device that is specified by the WinUSB interface handle.

The following example code queries the various descriptors for the USB device that is specified by the WinUSB interface handle. The example function retrieves the types of supported endpoints and their pipe identifiers. The example stores all three PipeId values for later use.

Step 3: Send Control Transfer to the Default Endpoint

Next, communicate with the device by issuing control request to the default endpoint.

All USB devices have a default endpoint in addition to the endpoints that are associated with interfaces. The primary purpose of the default endpoint is to provide the host with information that it can use to configure the device. However, devices can also use the default endpoint for device-specific purposes. For example, the OSR USB FX2 device uses the default endpoint to control the light bar and seven-segment digital display.

Control commands consist of an 8-byte setup packet, which includes a request code that specifies the particular request, and an optional data buffer. The request codes and buffer formats are vendor defined. In this example, the application sends data to the device to control the light bar. The code to set the light bar is 0xD8, which is defined for convenience as SET_BARGRAPH_DISPLAY. For this request, the device requires a 1-byte data buffer that specifies which elements should be lit by setting the appropriate bits.

The application can set this through the user interface (UI), such as by providing a set of eight check box controls to specify which elements of the light bar should be lit. The specified elements correspond to the appropriate bits in the buffer. To avoid UI code, the example code in this section sets the bits so that alternate lights get lit up.

Use the following steps to issue a control request.

  1. Allocate a 1-byte data buffer and load the data into the buffer that specifies the elements that should be lit by setting the appropriate bits.

  2. Construct a setup packet in a caller-allocated WINUSB_SETUP_PACKET structure. Initialize the members to represent the request type and data as follows:

    • The RequestType member specifies request direction. It is set to 0, which indicates host-to-device data transfer. For device-to-host transfers, set RequestType to 1.
    • The Request member is set to the vendor-defined code for this request, 0xD8. It is defined for convenience as SET_BARGRAPH_DISPLAY.
    • The Length member is set to the size of the data buffer.
    • The Index and Value members are not required for this request, so they are set to zero.

  3. Call WinUsb_ControlTransfer to transmit the request to the default endpoint by passing the device's WinUSB interface handle, the setup packet, and the data buffer. The function receives the number of bytes that were transferred to the device in the LengthTransferred parameter.

The following code example sends a control request to the specified USB device to control the lights on the light bar.

Step 4: Issue I/O Requests

Next, send data to the device's bulk-in and bulk-out endpoints that can be used for read and write requests, respectively. On the OSR USB FX2 device, these two endpoints are configured for loopback, so the device moves data from the bulk-in endpoint to the bulk-out endpoint. It does not change the value of the data or add any new data. For loopback configuration, a read request reads the data that was sent by the most recent write request. WinUSB provides the following functions for sending write and read requests:

To send a write request

  1. Allocate a buffer and fill it with the data that you want to write to the device. There is no limitation on the buffer size if the application does not set RAW_IO as the pipe's policy type. WinUSB divides the buffer into appropriately sized chunks, if necessary. If RAW_IO is set, the size of the buffer is limited by the maximum transfer size supported by WinUSB.
  2. Call WinUsb_WritePipe to write the buffer to the device. Pass the WinUSB interface handle for the device, the pipe identifier for the bulk-out pipe (as described in the Query the Device for USB Descriptors section of this topic), and the buffer. The function returns the number of bytes that are actually written to the device in the bytesWritten parameter. The Overlapped parameter is set to NULL to request a synchronous operation. To perform an asynchronous write request, set Overlapped to a pointer to an OVERLAPPED structure.

Write requests that contain zero-length data are forwarded down the USB stack. If the transfer length is greater than a maximum transfer length, WinUSB divides the request into smaller requests of maximum transfer length and submits them serially.The following code example allocates a string and sends it to the bulk-out endpoint of the device.

To send a read request

  • Call WinUsb_ReadPipe to read data from the bulk-in endpoint of the device. Pass the WinUSB interface handle of the device, the pipe identifier for the bulk-in endpoint, and an appropriately sized empty buffer. When the function returns, the buffer contains the data that was read from the device. The number of bytes that were read is returned in the function's bytesRead parameter. For read requests, the buffer must be a multiple of the maximum packet size.

Zero-length read requests complete immediately with success and are not sent down the stack. If the transfer length is greater than a maximum transfer length, WinUSB divides the request into smaller requests of maximum transfer length and submits them serially. If the transfer length is not a multiple of the endpoint's MaxPacketSize, WinUSB increases the size of the transfer to the next multiple of MaxPacketSize. If a device returns more data than was requested, WinUSB saves the excess data. If data remains from a previous read request, WinUSB copies it to the beginning of the next read request and completes the request, if necessary.The following code example reads data from the bulk-in endpoint of the device.

Step 5: Release the Device Handles

After you have completed all the required calls to the device, release the file handle and the WinUSB interface handle for the device. For this, call the following functions:

  • CloseHandle to release the handle that was created by CreateFile, as described in the step 1.
  • WinUsb_Free to release the WinUSB interface handle for the device, which is returned by WinUsb_Initialize.

Step 6: Implement Main

The following code example shows the main function of your console application.

Next steps

If your device supports isochronous endpoints, you can use WinUSB Functions to send transfers. This feature is only supported in Windows 8.1.

For more information, see Send USB isochronous transfers from a WinUSB desktop app.

Related topics

WinUSB
WinUSB Architecture and Modules
WinUSB (Winusb.sys) Installation
WinUSB Functions for Pipe Policy Modification
WinUSB Power Management
WinUSB Functions
Write a Windows desktop app based on the WinUSB template

Overview of USB Device Is Not Recognized Error

'My Sandisk USB flash drive is not recognized when I plug it into my laptop. Is there any way to fix USB flash drive not detected and restore the data. I have all my school work on it. Please help if you know any solutions.'

Like the user above, many users, including you now, have encountered the issue 'USB flash drive not recognized or detected' when they connect their USB device to a computer. Actually, many factors could trigger this issue, including:

  • USB connection issue
  • File system errors that make your USB become RAW
  • Drive letter issues
  • USB driver error
  • Hardware damage

Although all the causes can lead to a USB flash drive not being detected by the computer, the USB will show varying status in Disk Management depending on the cause. Thus, to fix a USB flash drive that is not recognized by your computer, you first need to check the device in Disk Management and then repair it according to the reasons.

Check The Causes of USB Flash Drive Not Recognized

Keep your USB flash drive connected and check it in Disk Management.

Drivers C-motech USB Devices

Step 1. Right-click 'This PC' and choose 'Manage'.

Step 2. Go to 'Disk Management'.

Step 3. Then you will see your USB flash drive in one of the following situations:

  • The USB shows as RAW
  • The USB shows as unallocated space
  • The USB shows without a drive letter
  • The USB is not showing up in Disk Management

After identifying the specific situation, you can now apply the corresponding solutions to fix the USB flash drive that is not recognized.

Fixes for USB Flash Drive Not Recognized/Detected

If you're not in one of the scenarios above, you can also apply the tips detailed below to have a try.

Fix 1. Recover Files from RAW USB Drive before Formatting

Applies to: Fix USB becomes RAW.

There must be file system errors on your USB flash drive that make your USB device not recognized as RAW. It could be file system missing, corrupted, or not compatible with Windows.

To repair a RAW USB, all you need to do is to recover data from the USB that is not recognized and then convert RAW to NTFS or FAT32 file system by formatting. Formatting will erase the existing data on your USB stick. That's why you need to perform data recovery first.

To retrieve data from an inaccessible device, you can use the professional disk recovery software - EaseUS Data Recovery Wizard. It perfectly supports deleted file recovery, formatted data recovery, RAW partition recovery, and other data loss situations.

To recover data from the RAW USB:

Step 1. Choose the flash drive to scan.

Launch EaseUS Data Recovery Wizard and choose your flash drive where you lost important files. Click 'Scan' to start.

Step 2. Check and preview found flash drive data.

After the scanning is finished, you can quickly locate a specific type of file by using the Filter feature as well as the Search.

  • Filter: A quick way to your wanted files.
  • Search: e.g. File name/file extension.

Step 3. Restore flash drive data.

After checking and finding lost flash drive files, select them and click Recover to restore. You shall save the found files to a safe location on your PC rather than to your flash drive.

After retrieving all the files, you can now format the USB flash drive and assign a new file system to the device, which will make it usable again.

Fix 2. Update Unallocated USB Driver and Create New Partition

Applies to: Fix USB shows as unallocated space.

If your USB is not recognized by the computer and becomes unallocated space, it probably results from outdated USB driver. Thus, you should try to reinstall the USB device driver.

Step 1. Connect the USB flash drive to the PC

Step 2. Navigate to 'Control Panel' > 'System' > ‘’Device Manager' > 'Disk drivers'.

Step 3. Find and select your USB device, right-click and first choose 'Uninstall' and then choose 'Scan for hardware changes' to refresh the drivers.

Step 4. Restart your computer.

After all the operations, you may find USB not recognized issue is fixed and the flash drive is detected. If reinstalling the USB driver doesn't help, you can recover data from the unallocated space with EaseUS Data Recovery Wizard introduced above and then create a new volume to make it ready for data storage. (The unallocated space will show up as 'lost partition' in EaseUS data recovery software. Choose the right partition to scan and then recover your data.)

To create a new volume on unallocated space:

Step 1. Go to 'This PC', right-click it and choose 'Manage' > 'Disk Management'.

Step 2. Right-click the unallocated space and choose 'New Simple Volume'.

Step 3. Follow the wizard to finish the remaining process.

Fix 3. Change USB Driver Letter to Make It Detectable

Applies to fix: USB shows without driver letter.

Another reason for USB flash drive not detected issue is that the drive letter assigned to the USB drive is occupied by another drive on the computer (or the drive letter on the USB is missing). To solve this problem, you just need to try EaseUS free partition software to assign an unused drive letter to the USB flash drive. It will help you fix the 'USB flash drive not recognized' issue and recover all the inaccessible data with ease.

You can also assign a drive letter to your USB in Disk Management.

Step 1. Keep your USB connected. Right-click 'This PC' and choose 'Manage' > 'Disk Management'.

Step 2. Right-click the volume on your USB flash drive and select 'Change Drive Letter and Paths'.

Step 3. In the new window, click 'Change'.

Step 4. Assign a new drive letter to your USB and click 'OK'.

Fix 4. Check USB Port and Change Connection to Make USB Recognized

Applies to: Fix USB isn't showing up in Disk Management

If your USB flash drive is not detected by Disk Management at all, it's likely that:

  • The USB is not connected properly
  • There are driver issues
  • Your USB device is physically damaged

Drivers C-motech Usb Devices Wireless Adapter

Therefore, you can first connect your USB connection including:

  • Change the USB port/cable
  • Connect your external hard drive or other storage devices to another computer and check whether the problem remains
  • Connect your USB drives to the rear port which provides a more stable power supply compared to the front ones

Then reinstall drivers (detailed above). If these tips don't help, you should consider sending the USB flash drive for repair.

The Bottom Line

When a USB flash drive is not recognized by the computer, there are varying causes. Once you can find the reason, you can easily make the decision on how to fix it. Besides, this issue also reminds you of the importance of growing a good habit of using your USB stick, like ejecting the device before disconnecting it and backing the device up regularly. I hope one of the solutions above could help to fix your USB flash drive that is not recognized or detected.

FAQs About USB Flash Drive Not Recognized or Detected

Besides fixing USB flash drive is not recognized error and bring lost files back, some users may also want to know the causes of USB flash drive not showing up, and how to repair the USB drive, etc.

If you are interested in these questions, follow on and you will find a satisfying answer below:

1. Why is my USB flash drive not showing up?

If a driver is missing, outdated, or corrupted, your computer won't be able to load your USB drive. USB driver issue, drive letter conflicts, and file system errors, etc. may all cause your USB flash drive not showing up on Windows PC.

Drivers C-motech Usb Devices Dongle

You can update USB driver, reinstall the disk driver, recover USB data, change USB drive letter, and format USB to reset its file system. For a detailed guide, you can refer to USB Not Showing Up in Windows 10/8/7 for help.

2. How can I repair my USB flash drive?

USB flash drives can become corrupt or damaged for a variety of reasons. Luckily you can fix your USB for free.

Windows chkdsk and Windows disk error checking are able to repair errors on your disk from the command line. Afterward, with EaseUS data recovery software, you can get your data back from a failed pen drive without losing files.

For a detailed guide, you may refer to USB Flash Drive Repair Tool for help.

3. How can I recover my USB flash drive that is not recognized?

As recommended on this page, when your USB flash drive, pen drive or external hard drive becomes unrecognized, you can get rid of this issue with the following steps:

Step 1. Check USB status in Disk Management:

Drivers C-motech Usb Devices Adapter

  • The USB shows as RAW
  • The USB shows as unallocated space
  • The USB shows without a drive letter
  • The USB is not showing up in Disk Management

Drivers C-motech Usb Devices Pc Camera

Step 2. Fix related error on the USB drive and make it recognized:

Drivers C-motech USB Devices

  1. 1. Recover files and format RAW USB.
  2. 2. Update unallocated USB drivers and create a new volume.
  3. 3. Change the USB drive letter.
  4. 4. Check USB port, change USB connection
  5. 5. If none of the above fixes work, take USB to a local device repair center for manual repair.