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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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/** Device Stack */ |
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/** */ |
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/**************************************************************************/ |
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/**************************************************************************/ |
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#define UX_SOURCE_CODE |
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/* Include necessary system files. */ |
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#include "ux_api.h" |
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#include "ux_device_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_device_stack_transfer_abort PORTABLE C */ |
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/* 6.1.10 */ |
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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 aborts a pending transfer request that has been */ |
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/* previously submitted. This function only cancels a specific */ |
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/* transfer request. */ |
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/* */ |
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/* The call back to the function will have the */ |
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/* UX_TRANSFER_STATUS_ABORT status */ |
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/* */ |
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/* INPUT */ |
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/* */ |
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/* transfer_request Pointer to transfer request */ |
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/* completion_code Completion code */ |
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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_utility_semaphore_put Put semaphore */ |
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/* */ |
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/* CALLED BY */ |
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/* */ |
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/* Application */ |
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/* Device Stack */ |
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/* */ |
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/**************************************************************************/ |
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UINT _ux_device_stack_transfer_abort(UX_SLAVE_TRANSFER *transfer_request, ULONG completion_code) |
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{ |
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UX_INTERRUPT_SAVE_AREA |
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UX_SLAVE_DCD *dcd; |
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UX_PARAMETER_NOT_USED(completion_code); |
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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_DEVICE_STACK_TRANSFER_ABORT, transfer_request, completion_code, 0, 0, UX_TRACE_DEVICE_STACK_EVENTS, 0, 0) |
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/* Get the pointer to the DCD. */ |
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dcd = &_ux_system_slave -> ux_system_slave_dcd; |
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/* Sets the completion code due to bus reset. */ |
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transfer_request -> ux_slave_transfer_request_completion_code = completion_code; |
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/* Ensure we're not preempted by the transfer completion ISR. */ |
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UX_DISABLE |
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/* It's possible the transfer already completed. Ensure it hasn't before doing the abort. */ |
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✓✓ |
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if (transfer_request -> ux_slave_transfer_request_status == UX_TRANSFER_STATUS_PENDING) |
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{ |
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/* Call the DCD if necessary for cleaning up the pending transfer. */ |
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dcd -> ux_slave_dcd_function(dcd, UX_DCD_TRANSFER_ABORT, (VOID *) transfer_request); |
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/* Restore interrupts. Note that the transfer request should not be modified now. */ |
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UX_RESTORE |
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/* We need to set the completion code for the transfer to aborted. Note |
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that the transfer request function cannot simultaneously modify this |
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because if the transfer was pending, then the transfer's thread is |
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currently waiting for it to complete. */ |
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transfer_request -> ux_slave_transfer_request_status = UX_TRANSFER_STATUS_ABORT; |
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/* Wake up the device driver who is waiting on the semaphore. */ |
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_ux_device_semaphore_put(&transfer_request -> ux_slave_transfer_request_semaphore); |
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} |
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else |
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{ |
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/* Restore interrupts. */ |
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UX_RESTORE |
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} |
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/* This function never fails. */ |
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return(UX_SUCCESS); |
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} |
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