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common/usbx_device_classes/src/ux_device_class_cdc_ecm_write.c
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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 */
/** */
/** Device CDC_ECM Class */
/** */
/**************************************************************************/
/**************************************************************************/
#define UX_SOURCE_CODE
/* Include necessary system files. */
#include "ux_api.h"
#include "ux_device_class_cdc_ecm.h"
#include "ux_device_stack.h"
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _ux_device_class_cdc_ecm_write PORTABLE C */
/* 6.1 */
/* AUTHOR */
/* */
/* Chaoqiong Xiao, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function writes a packet into a queue for later thread */
/* processing. */
/* */
/* INPUT */
/* */
/* cdc_ecm Address of cdc_ecm class */
/* instance */
/* */
/* OUTPUT */
/* */
/* None */
/* */
/* CALLS */
/* */
/* _ux_device_stack_transfer_request Transfer request */
/* _ux_utility_mutex_off Release mutex */
/* _ux_utility_event_flags_set Set event flags */
/* */
/* CALLED BY */
/* */
/* ThreadX */
/* */
/* RELEASE HISTORY */
/* */
/* DATE NAME DESCRIPTION */
/* */
/* 05-19-2020 Chaoqiong Xiao Initial Version 6.0 */
/* 09-30-2020 Chaoqiong Xiao Modified comment(s), */
/* used UX prefix to refer to */
/* TX symbols instead of using */
/* them directly, */
/* resulting in version 6.1 */
/* */
/**************************************************************************/
UINT _ux_device_class_cdc_ecm_write(VOID *cdc_ecm_class, NX_PACKET *packet)
{
UINT status;
UX_SLAVE_CLASS_CDC_ECM *cdc_ecm;
/* Proper class casting. */
cdc_ecm = (UX_SLAVE_CLASS_CDC_ECM *) cdc_ecm_class;
/* Protect this thread. */
_ux_utility_mutex_on(&cdc_ecm -> ux_slave_class_cdc_ecm_mutex);
/* We only want to send the packet if the link is up. */
if (cdc_ecm->ux_slave_class_cdc_ecm_link_state == UX_DEVICE_CLASS_CDC_ECM_LINK_STATE_UP)
{
/* Check the queue. See if there is something that is being sent. */
if (cdc_ecm -> ux_slave_class_cdc_ecm_xmit_queue == UX_NULL)
/* Memorize this packet at the beginning of the queue. */
cdc_ecm -> ux_slave_class_cdc_ecm_xmit_queue = packet;
else
/* Add the packet to the end of the queue. */
cdc_ecm -> ux_slave_class_cdc_ecm_xmit_queue_tail -> nx_packet_queue_next = packet;
/* Set the tail. */
cdc_ecm -> ux_slave_class_cdc_ecm_xmit_queue_tail = packet;
/* The packet to be sent is the last in the chain. */
packet -> nx_packet_queue_next = NX_NULL;
/* Free Mutex resource. */
_ux_utility_mutex_off(&cdc_ecm -> ux_slave_class_cdc_ecm_mutex);
/* Set an event to wake up the bulkin thread. */
_ux_utility_event_flags_set(&cdc_ecm -> ux_slave_class_cdc_ecm_event_flags_group, UX_DEVICE_CLASS_CDC_ECM_NEW_BULKIN_EVENT, UX_OR);
/* Packet successfully added. Return success. */
status = UX_SUCCESS;
}
else
{
/* Free Mutex resource. */
_ux_utility_mutex_off(&cdc_ecm -> ux_slave_class_cdc_ecm_mutex);
/* Report error to application. */
_ux_system_error_handler(UX_SYSTEM_LEVEL_THREAD, UX_SYSTEM_CONTEXT_CLASS, UX_CLASS_CDC_ECM_LINK_STATE_DOWN_ERROR);
/* Return error. */
status = UX_ERROR;
}
/* We are done here. */
return(status);
}