226 lines
8.8 KiB
C
226 lines
8.8 KiB
C
/*
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ChibiOS/RT - Copyright (C) 2006-2007 Giovanni Di Sirio.
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This file is part of ChibiOS/RT.
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ChibiOS/RT is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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ChibiOS/RT is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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/**
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* @file queues.h I/O
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* @brief Queues macros and structures.
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* @addtogroup io_queues
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* @{
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*/
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#ifndef _QUEUES_H_
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#define _QUEUES_H_
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/*
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* Module dependancies check.
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*/
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#if !CH_USE_SEMAPHORES
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#error "CH_USE_QUEUES requires CH_USE_SEMAPHORES"
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#endif
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/** Queue notification callback type. */
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typedef void (*qnotify_t)(void);
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/** Returned by the queue functions if the operation is successful. */
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#define Q_OK RDY_OK
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/** Returned by the queue functions if a timeout occurs. */
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#define Q_TIMEOUT RDY_TIMEOUT
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/** Returned by the queue functions if the queue is reset. */
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#define Q_RESET RDY_RESET
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/** Returned by the queue functions if the queue is empty. */
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#define Q_EMPTY -3
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/** Returned by the queue functions if the queue is full. */
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#define Q_FULL -4
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#if CH_USE_QUEUES
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/**
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* @brief Generic I/O queue structure.
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* @details This structure represents a generic Input or Output asymmetrical
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* queue. The queue is asymmetrical because one end is meant to be
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* accessed from a thread context, and thus can be blocking, the other
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* end is accessible from interrupt handlers or from within a kernel
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* lock zone (see <b>I-Locked</b> and <b>S-Locked</b> states in
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* @ref system_states) and is non-blocking.
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*/
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typedef struct {
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uint8_t *q_buffer; /**< Pointer to the queue buffer.*/
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uint8_t *q_top; /**< Pointer to the first location
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after the buffer.*/
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uint8_t *q_wrptr; /**< Write pointer.*/
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uint8_t *q_rdptr; /**< Read pointer.*/
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Semaphore q_sem; /**< Counter @p Semaphore.*/
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qnotify_t q_notify; /**< Data notification callback.*/
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} GenericQueue;
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/** Returns the queue's buffer size. */
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#define chQSize(q) ((q)->q_top - (q)->q_buffer)
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/**
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* Returns the used space if used on an Input Queue and the empty space if
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* used on an Output Queue.
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* @note The returned value can be less than zero when there are waiting
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* threads on the internal semaphore.
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*/
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#define chQSpace(q) chSemGetCounterI(&(q)->q_sem)
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/**
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* @brief Input queue structure.
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* @details This structure represents a generic asymmetrical input queue.
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* Writing in the queue is non-blocking and can be performed from
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* interrupt handlers or from within a kernel lock zone (see
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* <b>I-Locked</b> and <b>S-Locked</b> states in @ref system_states).
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* Reading the queue can be a blocking operation and is supposed to
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* be performed by a system thread.
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* @extends GenericQueue
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*/
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typedef GenericQueue InputQueue;
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/** Evaluates to @p TRUE if the specified Input Queue is empty. */
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#define chIQIsEmpty(q) (chQSpace(q) <= 0)
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/** Evaluates to @p TRUE if the specified Input Queue is full. */
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#define chIQIsFull(q) (chQSpace(q) >= chQSize(q))
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/**
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* @brief Input queue read.
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* @details This function reads a byte value from an input queue. If the queue
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* is empty then the calling thread is suspended until a byte arrives
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* in the queue.
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*
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* @param[in] iqp pointer to an @p InputQueue structure
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* @return A byte value from the queue or:
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* @retval Q_RESET if the queue was reset.
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*/
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#define chIQGet(iqp) chIQGetTimeout(iqp, TIME_INFINITE)
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/**
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* @brief Data part of a static input queue initializer.
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* @details This macro should be used when statically initializing an
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* input queue that is part of a bigger structure.
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* @param name the name of the input queue variable
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* @param buffer pointer to the queue buffer area
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* @param size size of the queue buffer area
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* @param inotify input notification callback pointer
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*/
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#define _INPUTQUEUE_DATA(name, buffer, size, inotify) { \
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(uint8_t *)(buffer), \
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(uint8_t *)(buffer) + size, \
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(uint8_t *)(buffer), \
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(uint8_t *)(buffer), \
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_SEMAPHORE_DATA(name.q_sem, 0), \
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inotify \
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}
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/**
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* @brief Static input queue initializer.
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* @details Statically initialized input queues require no explicit
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* initialization using @p chIQInit().
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* @param name the name of the input queue variable
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* @param buffer pointer to the queue buffer area
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* @param size size of the queue buffer area
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* @param inotify input notification callback pointer
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*/
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#define INPUTQUEUE_DECL(name, buffer, size, inotify) \
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InputQueue name = _INPUTQUEUE_DATA(name, buffer, size, inotify)
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/**
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* @brief Output queue structure.
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* @details This structure represents a generic asymmetrical output queue.
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* Reading from the queue is non-blocking and can be performed from
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* interrupt handlers or from within a kernel lock zone (see
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* <b>I-Locked</b> and <b>S-Locked</b> states in @ref system_states).
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* Writing the queue can be a blocking operation and is supposed to
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* be performed by a system thread.
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* @extends GenericQueue
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*/
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typedef GenericQueue OutputQueue;
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/** Evaluates to @p TRUE if the specified Output Queue is empty. */
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#define chOQIsEmpty(q) (chQSpace(q) >= chQSize(q))
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/** Evaluates to @p TRUE if the specified Output Queue is full. */
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#define chOQIsFull(q) (chQSpace(q) <= 0)
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/**
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* @brief Output queue write.
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* @details This function writes a byte value to an output queue. If the queue
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* is full then the calling thread is suspended until there is space
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* in the queue.
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*
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* @param[in] oqp pointer to an @p OutputQueue structure
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* @param[in] b the byte value to be written in the queue
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* @return The operation status:
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* @retval Q_OK if the operation succeeded.
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* @retval Q_RESET if the queue was reset.
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*/
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#define chOQPut(oqp, b) chOQPutTimeout(oqp, b, TIME_INFINITE)
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/**
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* @brief Data part of a static output queue initializer.
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* @details This macro should be used when statically initializing an
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* output queue that is part of a bigger structure.
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* @param name the name of the output queue variable.
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* @param buffer pointer to the queue buffer area
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* @param size size of the queue buffer area
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* @param onotify output notification callback pointer
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*/
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#define _OUTPUTQUEUE_DATA(name, buffer, size, onotify) { \
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(uint8_t *)(buffer), \
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(uint8_t *)(buffer) + size, \
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(uint8_t *)(buffer), \
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(uint8_t *)(buffer), \
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_SEMAPHORE_DATA(name.q_sem, size), \
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onotify \
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}
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/**
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* @brief Static output queue initializer.
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* @details Statically initialized output queues require no explicit
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* initialization using @p chOQInit().
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* @param name the name of the output queue variable
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* @param buffer pointer to the queue buffer area
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* @param size size of the queue buffer area
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* @param onotify output notification callback pointer
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*/
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#define OUTPUTQUEUE_DECL(name, buffer, size, onotify) \
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InputQueue name = _OUTPUTQUEUE_DATA(name, buffer, size, onotify)
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#ifdef __cplusplus
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extern "C" {
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#endif
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void chIQInit(InputQueue *qp, uint8_t *buffer, size_t size, qnotify_t inotify);
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void chIQResetI(InputQueue *qp);
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msg_t chIQPutI(InputQueue *qp, uint8_t b);
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msg_t chIQGetTimeout(InputQueue *qp, systime_t timeout);
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size_t chIQRead(InputQueue *qp, uint8_t *buffer, size_t n);
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void chOQInit(OutputQueue *queue, uint8_t *buffer, size_t size, qnotify_t onotify);
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void chOQResetI(OutputQueue *queue);
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msg_t chOQPutTimeout(OutputQueue *queue, uint8_t b, systime_t timeout);
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msg_t chOQGetI(OutputQueue *queue);
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size_t chOQWrite(OutputQueue *queue, uint8_t *buffer, size_t n);
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#ifdef __cplusplus
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}
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#endif
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#endif /* CH_USE_QUEUES */
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#endif /* _QUEUES_H_ */
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/** @} */
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