USBDevice: transferIn() method

{{APIRef("WebUSB API")}}{{SeeCompatTable}}{{SecureContext_Header}}{{AvailableInWorkers}}

The transferIn() method of the {{domxref("USBDevice")}} interface returns a {{jsxref("promise")}} that resolves with a {{domxref("USBInTransferResult")}} when bulk or interrupt data is received from the USB device.

Syntax

transferIn(endpointNumber, length)

Parameters

• endpointNumber
  • : The number of a device-specific endpoint (buffer).
• length
  • : The maximum number of bytes that will be read back from the device. The actual data is in the {{domxref("USBInTransferResult")}} in the resolved Promise.

Return value

A {{jsxref("promise")}} that resolves with a {{domxref("USBInTransferResult")}}.

Specifications

{{Specifications}}

Browser compatibility

{{Compat}}