USBDevice.controlTransferIn()

This is an experimental technology
Check the Browser compatibility table carefully before using this in production.

The controlTransferIn() method of the USBDevice interface returns a promise that resolves with a USBInTransferResult when a command or status operation has been transmitted to the USB device.

Syntax

var promise = USBDevice.controlTransferIn(setup, length)

Parameters

setup 
An object that sets options for . The available options are:
  • requestType: Must be one of three values specifying whether the tranfer is "standard" (common to all USB devices) "class" (common to an industry-standard class of devices) or "vendor".
  • recipient: Specifices the target of the transfer on the device, one of "device", "interface", "endpoint", or "other".
  • request: A vendor-specific command.
  • value: Vender-specific request parameters.
  • index: The interface number of the recipient.
length
A variable to contain the length of the data that will be read back from the device. The actual data is in the USBInTransferResult in the resolved Promise.

Return value

promise that resolves with a USBInTransferResult.

Specifications

Specification Status Comment
WebUSB
The definition of 'controlTransferIn()' in that specification.
Draft Initial definition.

Browser compatibility

Update compatibility data on GitHub
DesktopMobile
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidEdge MobileFirefox for AndroidOpera for AndroidSafari on iOSSamsung Internet
Basic support
Experimental
Chrome Full support 61Edge No support NoFirefox No support NoIE No support NoOpera Full support 48Safari No support NoWebView Android No support NoChrome Android Full support 61Edge Mobile No support NoFirefox Android No support NoOpera Android Full support 48Safari iOS No support NoSamsung Internet Android No support No

Legend

Full support  
Full support
No support  
No support
Experimental. Expect behavior to change in the future.
Experimental. Expect behavior to change in the future.

Document Tags and Contributors

Contributors to this page: jpmedley
Last updated by: jpmedley,