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/**************************************************************************/
/* */
/* Copyright (c) Microsoft Corporation. All rights reserved. */
/* */
/* This software is licensed under the Microsoft Software License */
/* Terms for Microsoft Azure RTOS. Full text of the license can be */
/* found in the LICENSE file at https://aka.ms/AzureRTOS_EULA */
/* and in the root directory of this software. */
/* */
/**************************************************************************/
/**************************************************************************/
/**************************************************************************/
/** */
/** USBX Component */
/** */
/** Host Stack */
/** */
/**************************************************************************/
/**************************************************************************/
/* Include necessary system files. */
#define UX_SOURCE_CODE
#include "ux_api.h"
#include "ux_host_stack.h"
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _ux_host_stack_configuration_interface_get PORTABLE C */
/* 6.1 */
/* AUTHOR */
/* */
/* Chaoqiong Xiao, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function returns an interface container based on a */
/* configuration handle, an interface index and an alternate setting */
/* index. */
/* */
/* INPUT */
/* */
/* configuration Pointer to configuration */
/* interface_index Index of interface */
/* alternate_setting_index Index of alternate setting */
/* interface Destination of interface */
/* pointer */
/* */
/* OUTPUT */
/* */
/* Completion Status */
/* */
/* CALLS */
/* */
/* None */
/* */
/* CALLED BY */
/* */
/* Application */
/* USBX Components */
/* */
/* RELEASE HISTORY */
/* */
/* DATE NAME DESCRIPTION */
/* */
/* 05-19-2020 Chaoqiong Xiao Initial Version 6.0 */
/* 09-30-2020 Chaoqiong Xiao Modified comment(s), */
/* resulting in version 6.1 */
/* */
/**************************************************************************/
UINT _ux_host_stack_configuration_interface_get(UX_CONFIGURATION *configuration,
UINT interface_index, UINT alternate_setting_index,
UX_INTERFACE **interface)
{
UINT current_interface_number;
UINT container_index;
UX_INTERFACE *current_interface;
/* Do a sanity check on the configuration handle. */
if (configuration -> ux_configuration_handle != (ULONG) (ALIGN_TYPE) configuration)
{
/* If trace is enabled, insert this event into the trace buffer. */
UX_TRACE_IN_LINE_INSERT(UX_TRACE_ERROR, UX_CONFIGURATION_HANDLE_UNKNOWN, configuration, 0, 0, UX_TRACE_ERRORS, 0, 0)
return(UX_CONFIGURATION_HANDLE_UNKNOWN);
}
/* Start with the interface attached to the configuration. */
current_interface = configuration -> ux_configuration_first_interface;
/* The first interface has the index 0 */
container_index = 0;
/* Reset the interface number */
current_interface_number = 0;
/* Traverse the list of the interfaces until we found the right one */
while (current_interface != UX_NULL)
{
/* Check if the interface index matches the current one. */
if (interface_index == container_index)
{
/* We have found the correct interface, now search for the alternate setting. */
current_interface_number = current_interface -> ux_interface_descriptor.bInterfaceNumber;
/* The first alternate setting has the index 0. */
container_index = 0;
/* Loop on all the alternate settings for this interface. */
while (current_interface != UX_NULL)
{
/* Check if the index is matched */
if (alternate_setting_index == container_index)
{
/* We have found the right interface/alternate setting combination. Set the
interface return pointer. */
*interface = current_interface;
/* Return success to caller. */
return(UX_SUCCESS);
}
/* Move to next alternate setting index. */
container_index++;
/* Move to the next alternate setting. */
current_interface = current_interface -> ux_interface_next_interface;
/* Check new interface pointer, might be the end. */
if (current_interface != UX_NULL)
{
/* And verify that we are still in the same interface. */
if (current_interface -> ux_interface_descriptor.bInterfaceNumber != current_interface_number)
{
/* Error trap. */
_ux_system_error_handler(UX_SYSTEM_LEVEL_THREAD, UX_SYSTEM_CONTEXT_ENUMERATOR, UX_INTERFACE_HANDLE_UNKNOWN);
/* If trace is enabled, insert this event into the trace buffer. */
UX_TRACE_IN_LINE_INSERT(UX_TRACE_ERROR, UX_INTERFACE_HANDLE_UNKNOWN, interface, 0, 0, UX_TRACE_ERRORS, 0, 0)
return(UX_INTERFACE_HANDLE_UNKNOWN);
}
}
}
}
/* Check the current interface, we may already be at the end ... */
if (current_interface != UX_NULL)
{
/* Move to the next interface. */
current_interface = current_interface -> ux_interface_next_interface;
/* Move to the next interface index. */
container_index++;
}
}
/* Error trap. */
_ux_system_error_handler(UX_SYSTEM_LEVEL_THREAD, UX_SYSTEM_CONTEXT_ENUMERATOR, UX_INTERFACE_HANDLE_UNKNOWN);
/* If trace is enabled, insert this event into the trace buffer. */
UX_TRACE_IN_LINE_INSERT(UX_TRACE_ERROR, UX_INTERFACE_HANDLE_UNKNOWN, interface, 0, 0, UX_TRACE_ERRORS, 0, 0)
/* Didn't find the right interface/alternate setting, return an error! */
return(UX_INTERFACE_HANDLE_UNKNOWN);
}