The default endpoint is active as soon as a connection is established between the host and the device.The default endpoint is available at the device level and is not defined in any interface of the device.The default endpoint is bidirectional, that is, the host can send data to the endpoint and receive data from it within one transfer.The address of the default endpoint is 0. Let's begin by studying these characteristics of the default endpoint. The purpose of a control transfer is to enable the host to obtain device information, configure the device, or perform control operations that are unique to the device. Any transfer that targets the default endpoint is called a control transfer. About the default endpointĪll USB devices must support at least one endpoint called the default endpoint. This topic explains the structure of a control transfer and how a client driver should send a control request to the device.
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