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/*************************************************************************** |
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* Copyright (c) 2024 Microsoft Corporation |
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* Copyright (c) 2026-present Eclipse ThreadX contributors |
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* |
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* This program and the accompanying materials are made available under the |
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* terms of the MIT License which is available at |
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* https://opensource.org/licenses/MIT. |
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* |
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* SPDX-License-Identifier: MIT |
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**************************************************************************/ |
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/**************************************************************************/ |
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/**************************************************************************/ |
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/** */ |
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/** USBX Component */ |
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/** */ |
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/** Host Stack */ |
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/** */ |
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/**************************************************************************/ |
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/**************************************************************************/ |
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/* Include necessary system files. */ |
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#define UX_SOURCE_CODE |
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#include "ux_api.h" |
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#include "ux_host_stack.h" |
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/**************************************************************************/ |
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/* */ |
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/* FUNCTION RELEASE */ |
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/* */ |
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/* _ux_host_stack_interface_set PORTABLE C */ |
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/* 6.1.12 */ |
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/* AUTHOR */ |
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/* */ |
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/* Chaoqiong Xiao, Microsoft Corporation */ |
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/* */ |
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/* DESCRIPTION */ |
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/* */ |
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/* This function performs a setting of an alternate setting for a */ |
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/* specific interface. */ |
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/* */ |
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/* INPUT */ |
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/* */ |
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/* interface Pointer to interface */ |
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/* */ |
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/* OUTPUT */ |
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/* */ |
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/* Completion Status */ |
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/* */ |
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/* CALLS */ |
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/* */ |
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/* _ux_host_stack_hcd_transfer_request HCD transfer request */ |
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/* */ |
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/* CALLED BY */ |
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/* */ |
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/* USBX Components */ |
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/* */ |
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/**************************************************************************/ |
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UINT _ux_host_stack_interface_set(UX_INTERFACE *interface_ptr) |
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{ |
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UX_DEVICE *device; |
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UX_CONFIGURATION *configuration; |
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UX_TRANSFER *transfer_request; |
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UINT status; |
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UX_ENDPOINT *control_endpoint; |
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/* If trace is enabled, insert this event into the trace buffer. */ |
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UX_TRACE_IN_LINE_INSERT(UX_TRACE_HOST_STACK_INTERFACE_SET, interface_ptr, 0, 0, 0, UX_TRACE_HOST_STACK_EVENTS, 0, 0) |
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/* Retrieve the pointer to the control endpoint and its transfer_request. |
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From the interface we go back to the configuration, then the device. |
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The device contains the default control endpoint container. */ |
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configuration = interface_ptr -> ux_interface_configuration; |
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device = configuration -> ux_configuration_device; |
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control_endpoint = &device -> ux_device_control_endpoint; |
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transfer_request = &control_endpoint -> ux_endpoint_transfer_request; |
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/* Create a transfer_request for the SET_INTERFACE request. No data for this request */ |
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transfer_request -> ux_transfer_request_requested_length = 0; |
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transfer_request -> ux_transfer_request_function = UX_SET_INTERFACE; |
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transfer_request -> ux_transfer_request_type = UX_REQUEST_OUT | UX_REQUEST_TYPE_STANDARD | UX_REQUEST_TARGET_INTERFACE; |
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transfer_request -> ux_transfer_request_index = (USHORT) interface_ptr -> ux_interface_descriptor.bInterfaceNumber; |
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transfer_request -> ux_transfer_request_value = (USHORT) interface_ptr -> ux_interface_descriptor.bAlternateSetting; |
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/* Send request. */ |
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status = _ux_host_stack_transfer_request(transfer_request); |
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/* Return status completion. */ |
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return(status); |
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} |
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