320 lines
10 KiB
C
320 lines
10 KiB
C
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/*
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ChibiOS - Copyright (C) 2006..2016 Giovanni Di Sirio
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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/**
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* @file hal_buffers.h
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* @brief I/O Buffers macros and structures.
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*
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* @addtogroup HAL_BUFFERS
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* @{
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*/
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#ifndef HAL_BUFFERS_H
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#define HAL_BUFFERS_H
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/*===========================================================================*/
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/* Driver constants. */
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/*===========================================================================*/
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/*===========================================================================*/
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/* Driver pre-compile time settings. */
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/*===========================================================================*/
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/*===========================================================================*/
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/* Derived constants and error checks. */
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/*===========================================================================*/
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/*===========================================================================*/
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/* Driver data structures and types. */
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/*===========================================================================*/
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/**
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* @brief Type of a generic queue of buffers.
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*/
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typedef struct io_buffers_queue io_buffers_queue_t;
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/**
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* @brief Double buffer notification callback type.
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*
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* @param[in] iodbp the buffers queue pointer
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*/
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typedef void (*bqnotify_t)(io_buffers_queue_t *bqp);
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/**
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* @brief Structure of a generic buffers queue.
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*/
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struct io_buffers_queue {
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/**
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* @brief Queue of waiting threads.
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*/
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threads_queue_t waiting;
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/**
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* @brief Queue suspended state flag.
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*/
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bool suspended;
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/**
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* @brief Active buffers counter.
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*/
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volatile size_t bcounter;
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/**
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* @brief Buffer write pointer.
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*/
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uint8_t *bwrptr;
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/**
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* @brief Buffer read pointer.
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*/
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uint8_t *brdptr;
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/**
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* @brief Pointer to the buffers boundary.
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*/
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uint8_t *btop;
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/**
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* @brief Size of buffers.
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* @note The buffer size must be not lower than <tt>sizeof(size_t) + 2</tt>
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* because the first bytes are used to store the used size of the
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* buffer.
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*/
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size_t bsize;
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/**
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* @brief Number of buffers.
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*/
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size_t bn;
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/**
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* @brief Queue of buffer objects.
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*/
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uint8_t *buffers;
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/**
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* @brief Pointer for R/W sequential access.
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* @note It is @p NULL if a new buffer must be fetched from the queue.
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*/
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uint8_t *ptr;
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/**
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* @brief Boundary for R/W sequential access.
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*/
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uint8_t *top;
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/**
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* @brief Data notification callback.
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*/
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bqnotify_t notify;
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/**
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* @brief Application defined field.
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*/
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void *link;
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};
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/**
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* @brief Type of an input buffers queue.
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*/
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typedef io_buffers_queue_t input_buffers_queue_t;
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/**
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* @brief Type of an output buffers queue.
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*/
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typedef io_buffers_queue_t output_buffers_queue_t;
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/*===========================================================================*/
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/* Driver macros. */
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/*===========================================================================*/
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/**
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* @brief Computes the size of a buffers queue buffer size.
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*
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* @param[in] n number of buffers in the queue
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* @param[in] size size of the buffers
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*/
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#define BQ_BUFFER_SIZE(n, size) \
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(((size_t)(size) + sizeof (size_t)) * (size_t)(n))
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/**
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* @name Macro Functions
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* @{
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*/
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/**
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* @brief Returns the queue's number of buffers.
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*
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* @param[in] bqp pointer to an @p io_buffers_queue_t structure
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* @return The number of buffers.
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*
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* @xclass
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*/
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#define bqSizeX(bqp) ((bqp)->bn)
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/**
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* @brief Return the ready buffers number.
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* @details Returns the number of filled buffers if used on an input queue
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* or the number of empty buffers if used on an output queue.
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*
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* @param[in] bqp pointer to an @p io_buffers_queue_t structure
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* @return The number of ready buffers.
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*
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* @iclass
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*/
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#define bqSpaceI(bqp) ((bqp)->bcounter)
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/**
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* @brief Returns the queue application-defined link.
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*
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* @param[in] bqp pointer to an @p io_buffers_queue_t structure
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* @return The application-defined link.
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*
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* @special
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*/
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#define bqGetLinkX(bqp) ((bqp)->link)
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/**
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* @brief Return the suspended state of the queue.
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*
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* @param[in] bqp pointer to an @p io_buffers_queue_t structure
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* @return The suspended state.
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* @retval false if blocking access to the queue is enabled.
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* @retval true if blocking access to the queue is suspended.
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*
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* @xclass
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*/
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#define bqIsSuspendedX(bqp) ((bqp)->suspended)
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/**
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* @brief Puts the queue in suspended state.
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* @details When the queue is put in suspended state all waiting threads are
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* woken with message @p MSG_RESET and subsequent attempt at waiting
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* on the queue will result in an immediate return with @p MSG_RESET
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* message.
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* @note The content of the queue is not altered, queues can be accessed
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* is suspended state until a blocking operation is met then a
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* @p MSG_RESET occurs.
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*
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* @param[in] bqp pointer to an @p io_buffers_queue_t structure
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*
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* @iclass
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*/
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#define bqSuspendI(bqp) { \
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(bqp)->suspended = true; \
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osalThreadDequeueAllI(&(bqp)->waiting, MSG_RESET); \
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}
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/**
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* @brief Resumes normal queue operations.
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*
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* @param[in] bqp pointer to an @p io_buffers_queue_t structure
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*
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* @xclass
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*/
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#define bqResumeX(bqp) { \
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(bqp)->suspended = false; \
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}
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/**
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* @brief Evaluates to @p TRUE if the specified input buffers queue is empty.
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*
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* @param[in] ibqp pointer to an @p input_buffers_queue_t structure
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* @return The queue status.
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* @retval false if the queue is not empty.
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* @retval true if the queue is empty.
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*
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* @iclass
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*/
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#define ibqIsEmptyI(ibqp) ((bool)(bqSpaceI(ibqp) == 0U))
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/**
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* @brief Evaluates to @p TRUE if the specified input buffers queue is full.
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*
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* @param[in] ibqp pointer to an @p input_buffers_queue_t structure
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* @return The queue status.
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* @retval false if the queue is not full.
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* @retval true if the queue is full.
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*
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* @iclass
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*/
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#define ibqIsFullI(ibqp) \
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/*lint -save -e9007 [13.5] No side effects, a pointer is passed.*/ \
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((bool)(((ibqp)->bwrptr == (ibqp)->brdptr) && ((ibqp)->bcounter != 0U))) \
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/*lint -restore*/
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/**
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* @brief Evaluates to @p true if the specified output buffers queue is empty.
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*
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* @param[in] obqp pointer to an @p output_buffers_queue_t structure
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* @return The queue status.
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* @retval false if the queue is not empty.
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* @retval true if the queue is empty.
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*
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* @iclass
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*/
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#define obqIsEmptyI(obqp) \
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/*lint -save -e9007 [13.5] No side effects, a pointer is passed.*/ \
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((bool)(((obqp)->bwrptr == (obqp)->brdptr) && ((obqp)->bcounter != 0U))) \
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/*lint -restore*/
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/**
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* @brief Evaluates to @p true if the specified output buffers queue is full.
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*
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* @param[in] obqp pointer to an @p output_buffers_queue_t structure
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* @return The queue status.
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* @retval false if the queue is not full.
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* @retval true if the queue is full.
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*
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* @iclass
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*/
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#define obqIsFullI(obqp) ((bool)(bqSpaceI(obqp) == 0U))
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/** @} */
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/*===========================================================================*/
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/* External declarations. */
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/*===========================================================================*/
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#ifdef __cplusplus
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extern "C" {
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#endif
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void ibqObjectInit(input_buffers_queue_t *ibqp, bool suspended, uint8_t *bp,
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size_t size, size_t n, bqnotify_t infy, void *link);
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void ibqResetI(input_buffers_queue_t *ibqp);
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uint8_t *ibqGetEmptyBufferI(input_buffers_queue_t *ibqp);
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void ibqPostFullBufferI(input_buffers_queue_t *ibqp, size_t size);
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msg_t ibqGetFullBufferTimeout(input_buffers_queue_t *ibqp,
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systime_t timeout);
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msg_t ibqGetFullBufferTimeoutS(input_buffers_queue_t *ibqp,
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systime_t timeout);
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void ibqReleaseEmptyBuffer(input_buffers_queue_t *ibqp);
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void ibqReleaseEmptyBufferS(input_buffers_queue_t *ibqp);
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msg_t ibqGetTimeout(input_buffers_queue_t *ibqp, systime_t timeout);
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size_t ibqReadTimeout(input_buffers_queue_t *ibqp, uint8_t *bp,
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size_t n, systime_t timeout);
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void obqObjectInit(output_buffers_queue_t *obqp, bool suspended, uint8_t *bp,
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size_t size, size_t n, bqnotify_t onfy, void *link);
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void obqResetI(output_buffers_queue_t *obqp);
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uint8_t *obqGetFullBufferI(output_buffers_queue_t *obqp,
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size_t *sizep);
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void obqReleaseEmptyBufferI(output_buffers_queue_t *obqp);
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msg_t obqGetEmptyBufferTimeout(output_buffers_queue_t *obqp,
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systime_t timeout);
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msg_t obqGetEmptyBufferTimeoutS(output_buffers_queue_t *obqp,
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systime_t timeout);
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void obqPostFullBuffer(output_buffers_queue_t *obqp, size_t size);
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void obqPostFullBufferS(output_buffers_queue_t *obqp, size_t size);
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msg_t obqPutTimeout(output_buffers_queue_t *obqp, uint8_t b,
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systime_t timeout);
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size_t obqWriteTimeout(output_buffers_queue_t *obqp, const uint8_t *bp,
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size_t n, systime_t timeout);
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bool obqTryFlushI(output_buffers_queue_t *obqp);
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void obqFlush(output_buffers_queue_t *obqp);
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#ifdef __cplusplus
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}
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#endif
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#endif /* HAL_BUFFERS_H */
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/** @} */
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