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/*************************************************************************** |
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* Copyright (c) 2024 Microsoft Corporation |
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* Copyright (c) 2026-present Eclipse ThreadX contributors |
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* |
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* This program and the accompanying materials are made available under the |
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* terms of the MIT License which is available at |
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* https://opensource.org/licenses/MIT. |
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* |
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* SPDX-License-Identifier: MIT |
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**************************************************************************/ |
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/**************************************************************************/ |
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/**************************************************************************/ |
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/** */ |
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/** USBX Component */ |
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/** */ |
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/** ACM CDC Class */ |
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/** */ |
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/**************************************************************************/ |
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/**************************************************************************/ |
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/* Include necessary system files. */ |
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#define UX_SOURCE_CODE |
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#include "ux_api.h" |
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#include "ux_host_class_cdc_acm.h" |
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#include "ux_host_stack.h" |
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/**************************************************************************/ |
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/* */ |
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/* FUNCTION RELEASE */ |
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/* */ |
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/* _ux_host_class_cdc_acm_reception_start PORTABLE C */ |
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/* 6.1 */ |
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/* AUTHOR */ |
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/* */ |
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/* Chaoqiong Xiao, Microsoft Corporation */ |
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/* */ |
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/* DESCRIPTION */ |
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/* */ |
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/* This function starts a reception with the ACM modem. This mechanism */ |
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/* allows for non blocking calls based on a packet orientated round */ |
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/* robbin buffer. When a packet is fully or partially received, an */ |
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/* application callback function is invoked and a new transfer request */ |
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/* is rescheduled. */ |
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/* */ |
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/* INPUT */ |
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/* */ |
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/* cdc_acm Pointer to cdc_acm class */ |
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/* cdc_acm_reception Pointer to reception struct */ |
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/* */ |
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/* OUTPUT */ |
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/* */ |
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/* Completion Status */ |
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/* */ |
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/* CALLS */ |
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/* */ |
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/* _ux_host_stack_transfer_request Process transfer request */ |
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/* */ |
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/* CALLED BY */ |
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/* */ |
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/* Application */ |
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/* */ |
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/**************************************************************************/ |
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UINT _ux_host_class_cdc_acm_reception_start (UX_HOST_CLASS_CDC_ACM *cdc_acm, |
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UX_HOST_CLASS_CDC_ACM_RECEPTION *cdc_acm_reception) |
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{ |
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UX_TRANSFER *transfer_request; |
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UINT status; |
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/* If trace is enabled, insert this event into the trace buffer. */ |
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UX_TRACE_IN_LINE_INSERT(UX_TRACE_HOST_CLASS_CDC_ACM_RECEPTION_START, cdc_acm, 0, 0, 0, UX_TRACE_HOST_CLASS_EVENTS, 0, 0) |
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/* Ensure the instance is valid. */ |
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✓✓ |
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if (cdc_acm -> ux_host_class_cdc_acm_state != UX_HOST_CLASS_INSTANCE_LIVE) |
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{ |
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/* Error trap. */ |
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_ux_system_error_handler(UX_SYSTEM_LEVEL_THREAD, UX_SYSTEM_CONTEXT_CLASS, UX_HOST_CLASS_INSTANCE_UNKNOWN); |
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/* If trace is enabled, insert this event into the trace buffer. */ |
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UX_TRACE_IN_LINE_INSERT(UX_TRACE_ERROR, UX_HOST_CLASS_INSTANCE_UNKNOWN, cdc_acm, 0, 0, UX_TRACE_ERRORS, 0, 0) |
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return(UX_HOST_CLASS_INSTANCE_UNKNOWN); |
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} |
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/* As further protection, we must ensure this instance of the interface is the data interface and not |
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the control interface ! */ |
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✓✓ |
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if (cdc_acm -> ux_host_class_cdc_acm_interface -> ux_interface_descriptor.bInterfaceClass != UX_HOST_CLASS_CDC_DATA_CLASS) |
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{ |
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/* Error trap. */ |
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_ux_system_error_handler(UX_SYSTEM_LEVEL_THREAD, UX_SYSTEM_CONTEXT_CLASS, UX_HOST_CLASS_INSTANCE_UNKNOWN); |
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/* If trace is enabled, insert this event into the trace buffer. */ |
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UX_TRACE_IN_LINE_INSERT(UX_TRACE_ERROR, UX_HOST_CLASS_INSTANCE_UNKNOWN, cdc_acm, 0, 0, UX_TRACE_ERRORS, 0, 0) |
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return(UX_HOST_CLASS_INSTANCE_UNKNOWN); |
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} |
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/* Start by aligning the head and tail of buffers to the same address supplied by the application. */ |
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cdc_acm_reception -> ux_host_class_cdc_acm_reception_data_head = cdc_acm_reception -> ux_host_class_cdc_acm_reception_data_buffer; |
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cdc_acm_reception -> ux_host_class_cdc_acm_reception_data_tail = cdc_acm_reception -> ux_host_class_cdc_acm_reception_data_buffer; |
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/* Get the pointer to the bulk in endpoint in the transfer_request. */ |
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transfer_request = &cdc_acm -> ux_host_class_cdc_acm_bulk_in_endpoint -> ux_endpoint_transfer_request; |
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/* Initialize the transfer request. */ |
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transfer_request -> ux_transfer_request_class_instance = (VOID *) cdc_acm; |
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transfer_request -> ux_transfer_request_data_pointer = cdc_acm_reception -> ux_host_class_cdc_acm_reception_data_head; |
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transfer_request -> ux_transfer_request_requested_length = cdc_acm_reception -> ux_host_class_cdc_acm_reception_block_size; |
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transfer_request -> ux_transfer_request_completion_function = _ux_host_class_cdc_acm_reception_callback; |
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/* Save the acm reception structure in the acm structure. */ |
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cdc_acm -> ux_host_class_cdc_acm_reception = cdc_acm_reception; |
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/* And declare we have a transfer in progress. */ |
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cdc_acm_reception -> ux_host_class_cdc_acm_reception_state = UX_HOST_CLASS_CDC_ACM_RECEPTION_STATE_STARTED; |
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/* Arm a first transfer on the bulk in endpoint. There is a callback to this function so we return to the caller |
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right away. */ |
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status = _ux_host_stack_transfer_request(transfer_request); |
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/* We do not know if the first transfer was successful yet. If the status is not OK, we need to stop the transfer |
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in progress flag. */ |
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✓✓ |
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if (status != UX_SUCCESS) |
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cdc_acm_reception -> ux_host_class_cdc_acm_reception_state = UX_HOST_CLASS_CDC_ACM_RECEPTION_STATE_STOPPED; |
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return(status); |
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} |
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/**************************************************************************/ |
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/* */ |
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/* FUNCTION RELEASE */ |
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/* */ |
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/* _uxe_host_class_cdc_acm_reception_start PORTABLE C */ |
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/* 6.3.0 */ |
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/* AUTHOR */ |
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/* */ |
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/* Chaoqiong Xiao, Microsoft Corporation */ |
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/* */ |
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/* DESCRIPTION */ |
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/* */ |
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/* This function checks errors in CDC ACM reception function call. */ |
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/* */ |
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/* INPUT */ |
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/* */ |
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/* cdc_acm Pointer to CDC ACM class */ |
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/* cdc_acm_reception Pointer to reception struct */ |
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/* */ |
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/* OUTPUT */ |
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/* */ |
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/* Status */ |
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/* */ |
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/* CALLS */ |
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/* */ |
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/* _ux_host_class_cdc_acm_reception_start */ |
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/* CDC ACM reception start */ |
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/* */ |
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/* CALLED BY */ |
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/* */ |
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/* Application */ |
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/* */ |
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/**************************************************************************/ |
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UINT _uxe_host_class_cdc_acm_reception_start (UX_HOST_CLASS_CDC_ACM *cdc_acm, |
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UX_HOST_CLASS_CDC_ACM_RECEPTION *cdc_acm_reception) |
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{ |
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/* Sanity checks. */ |
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if ((cdc_acm == UX_NULL) || (cdc_acm_reception == UX_NULL)) |
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return(UX_INVALID_PARAMETER); |
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/* Invoke CDC ACM reception start function. */ |
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return(_ux_host_class_cdc_acm_reception_start(cdc_acm, cdc_acm_reception)); |
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} |