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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_ACM Class */
/** */
/**************************************************************************/
/**************************************************************************/
#define UX_SOURCE_CODE
/* Include necessary system files. */
#include "ux_api.h"
#include "ux_device_class_cdc_acm.h"
#include "ux_device_stack.h"
#if !defined(UX_DEVICE_CLASS_CDC_ACM_TRANSMISSION_DISABLE) && !defined(UX_DEVICE_STANDALONE)
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _ux_device_class_cdc_acm_bulkout_thread PORTABLE C */
/* 6.3.0 */
/* AUTHOR */
/* */
/* Chaoqiong Xiao, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function is the thread of the cdc_acm bulk out endpoint. It */
/* is waiting for the host to send data on the bulk out endpoint to */
/* the device. */
/* */
/* It's for RTOS mode. */
/* */
/* INPUT */
/* */
/* cdc_acm_class Address of cdc_acm class */
/* container */
/* */
/* OUTPUT */
/* */
/* None */
/* */
/* CALLS */
/* */
/* _ux_device_stack_transfer_request Request transfer */
/* */
/* CALLED BY */
/* */
/* ThreadX */
/* */
/**************************************************************************/
VOID _ux_device_class_cdc_acm_bulkout_thread(ULONG cdc_acm_class)
{
UX_SLAVE_CLASS_CDC_ACM *cdc_acm;
UX_SLAVE_DEVICE *device;
UX_SLAVE_ENDPOINT *endpoint;
UX_SLAVE_INTERFACE *interface_ptr;
UX_SLAVE_TRANSFER *transfer_request;
UINT status;
/* Cast properly the cdc_acm instance. */
UX_THREAD_EXTENSION_PTR_GET(cdc_acm, UX_SLAVE_CLASS_CDC_ACM, cdc_acm_class)
/* Get the pointer to the device. */
device = &_ux_system_slave -> ux_system_slave_device;
/* This is the first time we are activated. We need the interface to the class. */
interface_ptr = cdc_acm -> ux_slave_class_cdc_acm_interface;
/* Locate the endpoints. */
endpoint = interface_ptr -> ux_slave_interface_first_endpoint;
/* Check the endpoint direction, if OUT we have the correct endpoint. */
if ((endpoint -> ux_slave_endpoint_descriptor.bEndpointAddress & UX_ENDPOINT_DIRECTION) != UX_ENDPOINT_OUT)
{
/* So the next endpoint has to be the OUT endpoint. */
endpoint = endpoint -> ux_slave_endpoint_next_endpoint;
}
/* This thread runs forever but can be suspended or resumed by the user application. */
while(1)
{
/* Select the transfer request associated with BULK OUT endpoint. */
transfer_request = &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)
{
#if UX_DEVICE_ENDPOINT_BUFFER_OWNER == 1
/* Use class managed buffer. */
transfer_request -> ux_slave_transfer_request_data_pointer =
UX_DEVICE_CLASS_CDC_ACM_READ_BUFFER(cdc_acm);
#endif
/* Send the request to the device controller. */
status = _ux_device_stack_transfer_request(transfer_request, endpoint -> ux_slave_endpoint_descriptor.wMaxPacketSize,
endpoint -> ux_slave_endpoint_descriptor.wMaxPacketSize);
/* Check the completion code. */
if (status == UX_SUCCESS)
{
/* Check the state of the transfer. If there is an error, we do not proceed with this report. */
if (transfer_request -> ux_slave_transfer_request_completion_code == UX_SUCCESS)
{
/* If there is a callback defined by the application, send the transaction event to it. */
if (cdc_acm -> ux_device_class_cdc_acm_read_callback != UX_NULL)
/* Callback exists. */
cdc_acm -> ux_device_class_cdc_acm_read_callback(cdc_acm, UX_SUCCESS, transfer_request -> ux_slave_transfer_request_data_pointer,
transfer_request -> ux_slave_transfer_request_actual_length);
}
else
{
/* We have an error. If there is a callback defined by the application, send the transaction event to it. */
if (cdc_acm -> ux_device_class_cdc_acm_read_callback != UX_NULL)
/* Callback exists. */
cdc_acm -> ux_device_class_cdc_acm_read_callback(cdc_acm, status, UX_NULL, 0);
}
}
}
/* We need to suspend ourselves. We will be resumed by the application if needed. */
_ux_device_thread_suspend(&cdc_acm -> ux_slave_class_cdc_acm_bulkout_thread);
}
}
#endif
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