USBDevice.controlTransferIn

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

Browser compatibilityUpdate compatibility data on GitHub