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/***************************************************************************
* Copyright (c) 2024 Microsoft Corporation
* Copyright (c) 2026-present Eclipse ThreadX contributors
*
* This program and the accompanying materials are made available under the
* terms of the MIT License which is available at
* https://opensource.org/licenses/MIT.
*
* SPDX-License-Identifier: MIT
**************************************************************************/
/**************************************************************************/
/**************************************************************************/
/** */
/** 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"
#if !defined(UX_DEVICE_STANDALONE)
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _ux_device_class_cdc_ecm_interrupt_thread PORTABLE C */
/* 6.1.11 */
/* AUTHOR */
/* */
/* Chaoqiong Xiao, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function is the thread of the cdc_ecm interrupt endpoint */
/* */
/* INPUT */
/* */
/* cdc_ecm_class Address of cdc_ecm class */
/* container */
/* */
/* OUTPUT */
/* */
/* None */
/* */
/* CALLS */
/* */
/* _ux_device_stack_transfer_request Request transfer */
/* _ux_utility_event_flags_get Get event flags */
/* _ux_utility_short_put Put 16-bit value to buffer */
/* _ux_device_thread_suspend Suspend thread */
/* */
/* CALLED BY */
/* */
/* ThreadX */
/* */
/**************************************************************************/
VOID _ux_device_class_cdc_ecm_interrupt_thread(ULONG cdc_ecm_class)
{
UX_SLAVE_CLASS *class_ptr;
UX_SLAVE_CLASS_CDC_ECM *cdc_ecm;
UX_SLAVE_DEVICE *device;
UX_SLAVE_TRANSFER *transfer_request;
UINT status;
ULONG actual_flags;
UCHAR *notification_buffer;
/* Cast properly the cdc_ecm instance. */
UX_THREAD_EXTENSION_PTR_GET(class_ptr, UX_SLAVE_CLASS, cdc_ecm_class)
/* Get the cdc_ecm instance from this class container. */
cdc_ecm = (UX_SLAVE_CLASS_CDC_ECM *) class_ptr -> ux_slave_class_instance;
/* Get the pointer to the device. */
device = &_ux_system_slave -> ux_system_slave_device;
/* This thread runs forever but can be suspended or resumed. */
while(1)
{
/* All CDC_ECM events are on the interrupt endpoint IN, from the host. */
transfer_request = &cdc_ecm -> ux_slave_class_cdc_ecm_interrupt_endpoint -> ux_slave_endpoint_transfer_request;
/* As long as the device is in the CONFIGURED state. */
while (device -> ux_slave_device_state == UX_DEVICE_CONFIGURED)
{
/* Wait until we have a event sent by the application. We do not treat yet the case where a timeout based
on the interrupt pipe frequency or a change in the idle state forces us to send an empty report. */
_ux_utility_event_flags_get(&cdc_ecm -> ux_slave_class_cdc_ecm_event_flags_group,
UX_DEVICE_CLASS_CDC_ECM_NETWORK_NOTIFICATION_EVENT,
UX_OR_CLEAR, &actual_flags, UX_WAIT_FOREVER);
/* Build the Network Notification response. */
notification_buffer = transfer_request -> ux_slave_transfer_request_data_pointer;
/* Set the request type. */
*(notification_buffer + UX_SETUP_REQUEST_TYPE) = UX_REQUEST_IN | UX_REQUEST_TYPE_CLASS | UX_REQUEST_TARGET_INTERFACE;
/* Set the request itself. */
*(notification_buffer + UX_SETUP_REQUEST) = 0;
/* Set the value. It is the network link. */
_ux_utility_short_put(notification_buffer + UX_SETUP_VALUE, (USHORT)(cdc_ecm -> ux_slave_class_cdc_ecm_link_state));
/* Set the Index. It is interface. The interface used is the DATA interface. Here we simply take the interface number of the CONTROL and add 1 to it
as it is assumed the classes are contiguous in number. */
_ux_utility_short_put(notification_buffer + UX_SETUP_INDEX, (USHORT)(cdc_ecm -> ux_slave_class_cdc_ecm_interface -> ux_slave_interface_descriptor.bInterfaceNumber + 1));
/* And the length is zero. */
*(notification_buffer + UX_SETUP_LENGTH) = 0;
/* Send the request to the device controller. */
status = _ux_device_stack_transfer_request(transfer_request, UX_DEVICE_CLASS_CDC_ECM_INTERRUPT_RESPONSE_LENGTH,
UX_DEVICE_CLASS_CDC_ECM_INTERRUPT_RESPONSE_LENGTH);
/* Check error code. */
if (status != UX_SUCCESS)
{
/* Since bus resets are expected, we do not treat it as an error. */
if (status != UX_TRANSFER_BUS_RESET)
{
/* Error trap. */
_ux_system_error_handler(UX_SYSTEM_LEVEL_THREAD, UX_SYSTEM_CONTEXT_CLASS, status);
}
}
}
/* We need to suspend ourselves. We will be resumed by the device enumeration module. */
_ux_device_thread_suspend(&cdc_ecm -> ux_slave_class_cdc_ecm_interrupt_thread);
}
}
#endif
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