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 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
USBInTransferResultin 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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