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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_device_get PORTABLE C */
/* 6.1 */
/* AUTHOR */
/* */
/* Chaoqiong Xiao, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function returns a device container based on its index. The */
/* device index start with device 0. Note that the index is a ULONG */
/* because we could have several controllers and a byte index might */
/* not be enough. */
/* */
/* INPUT */
/* */
/* device_index Index of device */
/* device Destination for device 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), */
/* optimized based on compile */
/* definitions, */
/* resulting in version 6.1 */
/* */
/**************************************************************************/
UINT _ux_host_stack_device_get(ULONG device_index, UX_DEVICE **device)
{
UX_DEVICE *current_device;
#if UX_MAX_DEVICES > 1
ULONG current_device_index;
#endif
/* If trace is enabled, insert this event into the trace buffer. */
UX_TRACE_IN_LINE_INSERT(UX_TRACE_HOST_STACK_DEVICE_GET, device_index, 0, 0, 0, UX_TRACE_HOST_STACK_EVENTS, 0, 0)
/* Check if the device index is still within the limits. */
if (device_index >= UX_SYSTEM_HOST_MAX_DEVICES_GET())
{
/* Error trap. */
_ux_system_error_handler(UX_SYSTEM_LEVEL_THREAD, UX_SYSTEM_CONTEXT_ENUMERATOR, UX_DEVICE_HANDLE_UNKNOWN);
/* If trace is enabled, insert this event into the trace buffer. */
UX_TRACE_IN_LINE_INSERT(UX_TRACE_ERROR, UX_DEVICE_HANDLE_UNKNOWN, device, 0, 0, UX_TRACE_ERRORS, 0, 0)
return(UX_DEVICE_HANDLE_UNKNOWN);
}
#if UX_MAX_DEVICES > 1
/* Start with the first device. */
current_device = _ux_system_host -> ux_system_host_device_array;
current_device_index = 0;
/* Search the list until the end. */
while (current_device_index < _ux_system_host -> ux_system_host_max_devices)
{
/* Check to see if this device is existing. */
if (current_device -> ux_device_handle != UX_UNUSED)
{
/* Have we reached the index we are looking for? */
if (device_index == current_device_index)
{
/* Yes, return the device pointer. */
*device = current_device;
/* Return successful completion. */
return(UX_SUCCESS);
}
}
/* Move to next device index. */
current_device_index++;
/* Move to next device. */
current_device++;
}
#else
/* Only one device, just check if it's used. */
current_device = _ux_system_host -> ux_system_host_device_array;
if (current_device -> ux_device_handle != UX_UNUSED)
{
*device = current_device;
return(UX_SUCCESS);
}
#endif
/* If trace is enabled, insert this event into the trace buffer. */
UX_TRACE_IN_LINE_INSERT(UX_TRACE_ERROR, UX_DEVICE_HANDLE_UNKNOWN, device, 0, 0, UX_TRACE_ERRORS, 0, 0)
/* Return error. */
return(UX_DEVICE_HANDLE_UNKNOWN);
}