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 the result of a command or status request has been received from 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
- The maximum number of bytes to read 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
The compatibility table in this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.
Desktop | Mobile | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
controlTransferIn | Chrome Full support 61 | Edge Full support 79 | Firefox No support No | IE No support No | Opera Full support 48 | Safari No support No | WebView Android No support No | Chrome Android Full support 61 | Firefox Android No support No | Opera Android Full support 45 | Safari iOS No support No | Samsung Internet Android Full support 8.0 |
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.