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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_new_device_get PORTABLE C */
/* 6.1 */
/* AUTHOR */
/* */
/* Chaoqiong Xiao, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function obtains a free device container for the new device. */
/* */
/* INPUT */
/* */
/* None */
/* */
/* OUTPUT */
/* */
/* UX_DEVICE pointer */
/* */
/* CALLS */
/* */
/* _ux_utility_memory_set Set memory to a value */
/* */
/* CALLED BY */
/* */
/* USBX Components */
/* */
/* RELEASE HISTORY */
/* */
/* DATE NAME DESCRIPTION */
/* */
/* 05-19-2020 Chaoqiong Xiao Initial Version 6.0 */
/* 09-30-2020 Chaoqiong Xiao Modified comment(s), */
/* optimized based on compile */
/* definitions, verified */
/* memset and memcpy cases, */
/* resulting in version 6.1 */
/* */
/**************************************************************************/
UX_DEVICE *_ux_host_stack_new_device_get(VOID)
{
#if UX_MAX_DEVICES > 1
ULONG container_index;
#endif
UX_DEVICE *device;
/* Start with the first device. */
device = _ux_system_host -> ux_system_host_device_array;
#if UX_MAX_DEVICES > 1
/* Reset the container index. */
container_index = 0;
/* Search the list until the end. */
while (container_index++ < _ux_system_host -> ux_system_host_max_devices)
#endif
{
/* Until we have found an unused entry. */
if (device -> ux_device_handle == UX_UNUSED)
{
/* Reset the entire entry. */
_ux_utility_memory_set(device, 0, sizeof(UX_DEVICE)); /* Use case of memset is verified. */
/* This entry is now used. */
device -> ux_device_handle = UX_USED;
/* Return the device pointer. */
return(device);
}
#if UX_MAX_DEVICES > 1
/* Move to the next device entry. */
device++;
#endif
}
/* No unused devices, return NULL. */
return(UX_NULL);
}