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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 */
/** */
/** ACM CDC Class */
/** */
/**************************************************************************/
/**************************************************************************/
/* Include necessary system files. */
#define UX_SOURCE_CODE
#include "ux_api.h"
#include "ux_host_class_cdc_acm.h"
#include "ux_host_stack.h"
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _ux_host_class_cdc_acm_reception_stop PORTABLE C */
/* 6.1.10 */
/* AUTHOR */
/* */
/* Chaoqiong Xiao, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function stops background reception previously started by */
/* ux_host_class_cdc_acm_reception_start. */
/* */
/* INPUT */
/* */
/* cdc_acm Pointer to cdc_acm class */
/* cdc_acm_reception Pointer to reception struct */
/* */
/* OUTPUT */
/* */
/* Completion Status */
/* */
/* CALLS */
/* */
/* _ux_host_stack_endpoint_transfer_abort */
/* Abort transfer */
/* _ux_host_semaphore_get Get semaphore */
/* */
/* CALLED BY */
/* */
/* Application */
/* */
/**************************************************************************/
UINT _ux_host_class_cdc_acm_reception_stop(UX_HOST_CLASS_CDC_ACM *cdc_acm,
UX_HOST_CLASS_CDC_ACM_RECEPTION *cdc_acm_reception)
{
UX_TRANSFER *transfer_request;
/* If trace is enabled, insert this event into the trace buffer. */
UX_TRACE_IN_LINE_INSERT(UX_TRACE_HOST_CLASS_CDC_ACM_RECEPTION_STOP, cdc_acm, 0, 0, 0, UX_TRACE_HOST_CLASS_EVENTS, 0, 0)
/* Ensure the instance is valid. */
if (cdc_acm -> ux_host_class_cdc_acm_state != UX_HOST_CLASS_INSTANCE_LIVE)
{
/* Error trap. */
_ux_system_error_handler(UX_SYSTEM_LEVEL_THREAD, UX_SYSTEM_CONTEXT_CLASS, UX_HOST_CLASS_INSTANCE_UNKNOWN);
/* If trace is enabled, insert this event into the trace buffer. */
UX_TRACE_IN_LINE_INSERT(UX_TRACE_ERROR, UX_HOST_CLASS_INSTANCE_UNKNOWN, cdc_acm, 0, 0, UX_TRACE_ERRORS, 0, 0)
return(UX_HOST_CLASS_INSTANCE_UNKNOWN);
}
/* As further protection, we must ensure this instance of the interface is the data interface and not
the control interface ! */
if (cdc_acm -> ux_host_class_cdc_acm_interface -> ux_interface_descriptor.bInterfaceClass != UX_HOST_CLASS_CDC_DATA_CLASS)
{
/* Error trap. */
_ux_system_error_handler(UX_SYSTEM_LEVEL_THREAD, UX_SYSTEM_CONTEXT_CLASS, UX_HOST_CLASS_INSTANCE_UNKNOWN);
/* If trace is enabled, insert this event into the trace buffer. */
UX_TRACE_IN_LINE_INSERT(UX_TRACE_ERROR, UX_HOST_CLASS_INSTANCE_UNKNOWN, cdc_acm, 0, 0, UX_TRACE_ERRORS, 0, 0)
return(UX_HOST_CLASS_INSTANCE_UNKNOWN);
}
/* Check if we do have transfers for this application. If none, nothing to do. */
if (cdc_acm_reception -> ux_host_class_cdc_acm_reception_state == UX_HOST_CLASS_CDC_ACM_RECEPTION_STATE_STOPPED)
return(UX_SUCCESS);
/* We need to abort transactions on the bulk In pipe. */
_ux_host_stack_endpoint_transfer_abort(cdc_acm -> ux_host_class_cdc_acm_bulk_in_endpoint);
/* Declare the reception stopped. */
cdc_acm_reception -> ux_host_class_cdc_acm_reception_state = UX_HOST_CLASS_CDC_ACM_RECEPTION_STATE_STOPPED;
/* Obtain pointer to transfer request. */
transfer_request = &cdc_acm -> ux_host_class_cdc_acm_bulk_in_endpoint -> ux_endpoint_transfer_request;
/* Reset the completion callback function. */
transfer_request -> ux_transfer_request_completion_function = UX_NULL;
#if !defined(UX_HOST_STANDALONE)
/* Clear semaphore counts that were (incorrectly) increased during each transfer
completion. */
while (_ux_host_semaphore_waiting(&(transfer_request -> ux_transfer_request_semaphore)))
_ux_host_semaphore_get(&transfer_request -> ux_transfer_request_semaphore, 0);
#endif
/* This function never really fails. */
return(UX_SUCCESS);
}
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _uxe_host_class_cdc_acm_reception_stop PORTABLE C */
/* 6.3.0 */
/* AUTHOR */
/* */
/* Chaoqiong Xiao, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function checks errors in CDC ACM reception function call. */
/* */
/* INPUT */
/* */
/* cdc_acm Pointer to CDC ACM class */
/* cdc_acm_reception Pointer to reception struct */
/* */
/* OUTPUT */
/* */
/* Status */
/* */
/* CALLS */
/* */
/* _ux_host_class_cdc_acm_reception_stop CDC ACM reception stop */
/* */
/* CALLED BY */
/* */
/* Application */
/* */
/**************************************************************************/
UINT _uxe_host_class_cdc_acm_reception_stop(UX_HOST_CLASS_CDC_ACM *cdc_acm,
UX_HOST_CLASS_CDC_ACM_RECEPTION *cdc_acm_reception)
{
/* Sanity checks. */
if ((cdc_acm == UX_NULL) || (cdc_acm_reception == UX_NULL))
return(UX_INVALID_PARAMETER);
/* Invoke CDC ACM reception function. */
return(_ux_host_class_cdc_acm_reception_stop(cdc_acm, cdc_acm_reception));
}
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