USBDevice.controlTransferIn()
Experimental: 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 transfer is"standard"
(common to all USB devices)"class"
(common to an industry-standard class of devices) or"vendor"
. -
recipient
: Specifies 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 |
---|
WebUSB API # ref-for-dom-usbdevice-controltransferin |
Browser compatibility
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