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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 */
/** */
/** Generic Serial Host module class */
/** */
/**************************************************************************/
/**************************************************************************/
/* Include necessary system files. */
#define UX_SOURCE_CODE
#include "ux_api.h"
#include "ux_host_class_gser.h"
#include "ux_host_stack.h"
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _ux_host_class_gser_reception_start PORTABLE C */
/* 6.1 */
/* AUTHOR */
/* */
/* Chaoqiong Xiao, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function starts a reception with the generic serial class. This*/
/* allows for non blocking calls based on a packet orientated round */
/* robbin buffer. When a packet is fully or partially received, an */
/* application callback function is invoked and a new transfer request */
/* is rescheduled. */
/* */
/* INPUT */
/* */
/* gser Pointer to gser class */
/* gser_reception Pointer to reception struct */
/* */
/* OUTPUT */
/* */
/* Completion Status */
/* */
/* CALLS */
/* */
/* _ux_host_stack_transfer_request Process transfer request */
/* */
/* CALLED BY */
/* */
/* Application */
/* */
/**************************************************************************/
UINT _ux_host_class_gser_reception_start (UX_HOST_CLASS_GSER *gser,
UX_HOST_CLASS_GSER_RECEPTION *gser_reception)
{
UX_TRANSFER *transfer_request;
UINT status;
ULONG interface_index;
/* If trace is enabled, insert this event into the trace buffer. */
UX_TRACE_IN_LINE_INSERT(UX_TRACE_HOST_CLASS_GSER_RECEPTION_START, gser, 0, 0, 0, UX_TRACE_HOST_CLASS_EVENTS, 0, 0)
/* Ensure the instance is valid. */
if (gser -> ux_host_class_gser_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, gser, 0, 0, UX_TRACE_ERRORS, 0, 0)
return(UX_HOST_CLASS_INSTANCE_UNKNOWN);
}
/* Get the interface index. */
interface_index = gser_reception -> ux_host_class_gser_reception_interface_index;
/* Start by aligning the head and tail of buffers to the same address supplied by the application. */
gser_reception -> ux_host_class_gser_reception_data_head = gser_reception -> ux_host_class_gser_reception_data_buffer;
gser_reception -> ux_host_class_gser_reception_data_tail = gser_reception -> ux_host_class_gser_reception_data_buffer;
/* Get the pointer to the bulk in endpoint in the transfer_request. */
transfer_request = &gser -> ux_host_class_gser_interface_array[interface_index].ux_host_class_gser_bulk_in_endpoint -> ux_endpoint_transfer_request;
/* Save the interface number in the Transfer Request. */
transfer_request -> ux_transfer_request_user_specific = (VOID *) (ALIGN_TYPE) interface_index;
/* Initialize the transfer request. */
transfer_request -> ux_transfer_request_class_instance = (VOID *) gser;
transfer_request -> ux_transfer_request_data_pointer = gser_reception -> ux_host_class_gser_reception_data_head;
transfer_request -> ux_transfer_request_requested_length = gser_reception -> ux_host_class_gser_reception_block_size;
transfer_request -> ux_transfer_request_completion_function = _ux_host_class_gser_reception_callback;
/* Save the acm reception structure in the acm structure. */
gser -> ux_host_class_gser_interface_array[interface_index].ux_host_class_gser_reception = gser_reception;
/* And declare we have a transfer in progress. */
gser_reception -> ux_host_class_gser_reception_state = UX_HOST_CLASS_GSER_RECEPTION_STATE_STARTED;
/* Arm a first transfer on the bulk in endpoint. There is a callback to this function so we return to the caller
right away. */
status = _ux_host_stack_transfer_request(transfer_request);
/* We do not know if the first transfer was successful yet. If the status is not OK, we need to stop the transfer
in progress flag. */
if (status != UX_SUCCESS)
gser_reception -> ux_host_class_gser_reception_state = UX_HOST_CLASS_GSER_RECEPTION_STATE_STOPPED;
return(status);
}
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _uxe_host_class_gser_reception_start PORTABLE C */
/* 6.3.0 */
/* AUTHOR */
/* */
/* Chaoqiong Xiao, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function checks errors in CDC ACM reception function call. */
/* */
/* INPUT */
/* */
/* gser Pointer to CDC ACM class */
/* gser_reception Pointer to reception struct */
/* */
/* OUTPUT */
/* */
/* Status */
/* */
/* CALLS */
/* */
/* _ux_host_class_gser_reception_start */
/* GSER reception start */
/* */
/* CALLED BY */
/* */
/* Application */
/* */
/**************************************************************************/
UINT _uxe_host_class_gser_reception_start (UX_HOST_CLASS_GSER *gser,
UX_HOST_CLASS_GSER_RECEPTION *gser_reception)
{
/* Sanity checks. */
if ((gser == UX_NULL) || (gser_reception == UX_NULL))
return(UX_INVALID_PARAMETER);
/* Invoke CDC ACM reception start function. */
return(_ux_host_class_gser_reception_start(gser, gser_reception));
}
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