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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_callback PORTABLE C */
/* 6.1 */
/* AUTHOR */
/* */
/* Chaoqiong Xiao, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function is the callback from the USBX transfer functions, */
/* it is called when a full or partial transfer has been done for a */
/* bulk in transfer. It calls back the application. */
/* */
/* INPUT */
/* */
/* transfer_request Pointer to transfer request */
/* */
/* OUTPUT */
/* */
/* None */
/* */
/* CALLS */
/* */
/* _ux_host_stack_transfer_request Process transfer request */
/* */
/* CALLED BY */
/* */
/* Application */
/* */
/**************************************************************************/
VOID _ux_host_class_cdc_acm_reception_callback (UX_TRANSFER *transfer_request)
{
UX_HOST_CLASS_CDC_ACM *cdc_acm;
UX_HOST_CLASS_CDC_ACM_RECEPTION *cdc_acm_reception;
/* Get the class instance for this transfer request. */
cdc_acm = (UX_HOST_CLASS_CDC_ACM *) transfer_request -> ux_transfer_request_class_instance;
/* Get the pointer to the acm reception structure. */
cdc_acm_reception = cdc_acm -> ux_host_class_cdc_acm_reception;
/* Check the state of the transfer. If there is an error, we do not proceed with this report. */
if (transfer_request -> ux_transfer_request_completion_code != UX_SUCCESS)
{
/* The reception is stopped. */
cdc_acm_reception -> ux_host_class_cdc_acm_reception_state = UX_HOST_CLASS_CDC_ACM_RECEPTION_STATE_STOPPED;
/* We do not proceed. */
return;
}
/* Move to the next reception buffer. Check if we are at the end of the application buffer. */
if (cdc_acm_reception -> ux_host_class_cdc_acm_reception_data_head + cdc_acm_reception -> ux_host_class_cdc_acm_reception_block_size >=
cdc_acm_reception -> ux_host_class_cdc_acm_reception_data_buffer + cdc_acm_reception -> ux_host_class_cdc_acm_reception_data_buffer_size)
/* Program the head to be at the beginning of the application buffer. */
cdc_acm_reception -> ux_host_class_cdc_acm_reception_data_head = cdc_acm_reception -> ux_host_class_cdc_acm_reception_data_buffer;
else
/* Program the head to be after the current buffer. */
cdc_acm_reception -> ux_host_class_cdc_acm_reception_data_head += cdc_acm_reception -> ux_host_class_cdc_acm_reception_block_size;
/* OVERFLOW check: if the head reaches the tail buffer that contains reception data */
if (cdc_acm_reception -> ux_host_class_cdc_acm_reception_data_tail == cdc_acm_reception -> ux_host_class_cdc_acm_reception_data_head)
{
/* Error trap. */
_ux_system_error_handler(UX_SYSTEM_LEVEL_THREAD, UX_SYSTEM_CONTEXT_CLASS, UX_BUFFER_OVERFLOW);
/* If trace is enabled, insert this event into the trace buffer. */
UX_TRACE_IN_LINE_INSERT(UX_TRACE_ERROR, UX_BUFFER_OVERFLOW, transfer_request, 0, 0, UX_TRACE_ERRORS, 0, 0)
/* We have an overflow. We cannot continue. Report to the application. */
cdc_acm_reception -> ux_host_class_cdc_acm_reception_callback(cdc_acm, UX_BUFFER_OVERFLOW, UX_NULL, 0);
/* And stop the transfer in progress flag. */
cdc_acm_reception -> ux_host_class_cdc_acm_reception_state = UX_HOST_CLASS_CDC_ACM_RECEPTION_STATE_STOPPED;
return;
}
/* We need to report this transfer to the application. */
cdc_acm_reception -> ux_host_class_cdc_acm_reception_callback(cdc_acm,
transfer_request -> ux_transfer_request_completion_code,
transfer_request -> ux_transfer_request_data_pointer,
transfer_request -> ux_transfer_request_actual_length);
/* Set data pointer to the next reception buffer. */
transfer_request -> ux_transfer_request_data_pointer = cdc_acm_reception -> ux_host_class_cdc_acm_reception_data_head;
/* Arm another transfer. */
_ux_host_stack_transfer_request(transfer_request);
/* There is no status to be reported back to the stack. */
return;
}
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