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/*
ChibiOS/HAL - Copyright (C) 2006,2007,2008,2009,2010,
2011,2012,2013,2014 Giovanni Di Sirio.
This file is part of ChibiOS/HAL
ChibiOS/HAL is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
ChibiOS/RT is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/**
* @file hal_queues.h
* @brief I/O Queues macros and structures.
*
* @addtogroup io_queues
* @{
*/
#ifndef _HAL_QUEUES_H_
#define _HAL_QUEUES_H_
/* The ChibiOS/RT kernel provides the following definitions by itself, this
check is performed in order to avoid conflicts. */
#if !defined(_CHIBIOS_RT_) || !CH_CFG_USE_QUEUES || defined(__DOXYGEN__)
/**
* @name Queue functions returned status value
* @{
*/
#define Q_OK MSG_OK /**< @brief Operation successful. */
#define Q_TIMEOUT MSG_TIMEOUT /**< @brief Timeout condition. */
#define Q_RESET MSG_RESET /**< @brief Queue has been reset. */
#define Q_EMPTY -3 /**< @brief Queue empty. */
#define Q_FULL -4 /**< @brief Queue full, */
/** @} */
/**
* @brief Type of a generic I/O queue structure.
*/
typedef struct io_queue io_queue_t;
/** @brief Queue notification callback type.*/
typedef void (*qnotify_t)(io_queue_t *qp);
/**
* @brief Generic I/O queue structure.
* @details This structure represents a generic Input or Output asymmetrical
* queue. The queue is asymmetrical because one end is meant to be
* accessed from a thread context, and thus can be blocking, the other
* end is accessible from interrupt handlers or from within a kernel
* lock zone (see <b>I-Locked</b> and <b>S-Locked</b> states in
* @ref system_states) and is non-blocking.
*/
struct io_queue {
threads_queue_t q_waiting; /**< @brief Waiting thread. */
size_t q_counter; /**< @brief Resources counter. */
uint8_t *q_buffer; /**< @brief Pointer to the queue buffer.*/
uint8_t *q_top; /**< @brief Pointer to the first
location after the buffer. */
uint8_t *q_wrptr; /**< @brief Write pointer. */
uint8_t *q_rdptr; /**< @brief Read pointer. */
qnotify_t q_notify; /**< @brief Data notification callback. */
void *q_link; /**< @brief Application defined field. */
};
/**
* @name Macro Functions
* @{
*/
/**
* @brief Returns the queue's buffer size.
*
* @param[in] qp pointer to a @p io_queue_t structure.
* @return The buffer size.
*
* @iclass
*/
#define qSizeI(qp) ((size_t)((qp)->q_top - (qp)->q_buffer))
/**
* @brief Queue space.
* @details Returns the used space if used on an input queue or the empty
* space if used on an output queue.
*
* @param[in] qp pointer to a @p io_queue_t structure.
* @return The buffer space.
*
* @iclass
*/
#define qSpaceI(qp) ((qp)->q_counter)
/**
* @brief Returns the queue application-defined link.
* @note This function can be called in any context.
*
* @param[in] qp pointer to a @p io_queue_t structure.
* @return The application-defined link.
*
* @special
*/
#define qGetLink(qp) ((qp)->q_link)
/** @} */
/**
* @extends io_queue_t
*
* @brief Type of an input queue structure.
* @details This structure represents a generic asymmetrical input queue.
* Writing to the queue is non-blocking and can be performed from
* interrupt handlers or from within a kernel lock zone (see
* <b>I-Locked</b> and <b>S-Locked</b> states in @ref system_states).
* Reading the queue can be a blocking operation and is supposed to
* be performed by a system thread.
*/
typedef io_queue_t input_queue_t;
/**
* @name Macro Functions
* @{
*/
/**
* @brief Returns the filled space into an input queue.
*
* @param[in] iqp pointer to an @p input_queue_t structure
* @return The number of full bytes in the queue.
* @retval 0 if the queue is empty.
*
* @iclass
*/
#define iqGetFullI(iqp) qSpaceI(iqp)
/**
* @brief Returns the empty space into an input queue.
*
* @param[in] iqp pointer to an @p input_queue_t structure
* @return The number of empty bytes in the queue.
* @retval 0 if the queue is full.
*
* @iclass
*/
#define iqGetEmptyI(iqp) (qSizeI(iqp) - qSpaceI(iqp))
/**
* @brief Evaluates to @p TRUE if the specified input queue is empty.
*
* @param[in] iqp pointer to an @p input_queue_t structure.
* @return The queue status.
* @retval FALSE if the queue is not empty.
* @retval TRUE if the queue is empty.
*
* @iclass
*/
#define iqIsEmptyI(iqp) ((bool)(qSpaceI(iqp) <= 0))
/**
* @brief Evaluates to @p TRUE if the specified input queue is full.
*
* @param[in] iqp pointer to an @p input_queue_t structure.
* @return The queue status.
* @retval FALSE if the queue is not full.
* @retval TRUE if the queue is full.
*
* @iclass
*/
#define iqIsFullI(iqp) ((bool)(((iqp)->q_wrptr == (iqp)->q_rdptr) && \
((iqp)->q_counter != 0)))
/**
* @brief Input queue read.
* @details This function reads a byte value from an input queue. If the queue
* is empty then the calling thread is suspended until a byte arrives
* in the queue.
*
* @param[in] iqp pointer to an @p input_queue_t structure
* @return A byte value from the queue.
* @retval Q_RESET if the queue has been reset.
*
* @api
*/
#define iqGet(iqp) iqGetTimeout(iqp, TIME_INFINITE)
/** @} */
/**
* @brief Data part of a static input queue initializer.
* @details This macro should be used when statically initializing an
* input queue that is part of a bigger structure.
*
* @param[in] name the name of the input queue variable
* @param[in] buffer pointer to the queue buffer area
* @param[in] size size of the queue buffer area
* @param[in] inotify input notification callback pointer
* @param[in] link application defined pointer
*/
#define _INPUTQUEUE_DATA(name, buffer, size, inotify, link) { \
NULL, \
0, \
(uint8_t *)(buffer), \
(uint8_t *)(buffer) + (size), \
(uint8_t *)(buffer), \
(uint8_t *)(buffer), \
(inotify), \
(link) \
}
/**
* @brief Static input queue initializer.
* @details Statically initialized input queues require no explicit
* initialization using @p iqInit().
*
* @param[in] name the name of the input queue variable
* @param[in] buffer pointer to the queue buffer area
* @param[in] size size of the queue buffer area
* @param[in] inotify input notification callback pointer
* @param[in] link application defined pointer
*/
#define INPUTQUEUE_DECL(name, buffer, size, inotify, link) \
input_queue_t name = _INPUTQUEUE_DATA(name, buffer, size, inotify, link)
/**
* @extends io_queue_t
*
* @brief Type of an output queue structure.
* @details This structure represents a generic asymmetrical output queue.
* Reading from the queue is non-blocking and can be performed from
* interrupt handlers or from within a kernel lock zone (see
* <b>I-Locked</b> and <b>S-Locked</b> states in @ref system_states).
* Writing the queue can be a blocking operation and is supposed to
* be performed by a system thread.
*/
typedef io_queue_t output_queue_t;
/**
* @name Macro Functions
* @{
*/
/**
* @brief Returns the filled space into an output queue.
*
* @param[in] oqp pointer to an @p output_queue_t structure
* @return The number of full bytes in the queue.
* @retval 0 if the queue is empty.
*
* @iclass
*/
#define oqGetFullI(oqp) (qSizeI(oqp) - qSpaceI(oqp))
/**
* @brief Returns the empty space into an output queue.
*
* @param[in] oqp pointer to an @p output_queue_t structure
* @return The number of empty bytes in the queue.
* @retval 0 if the queue is full.
*
* @iclass
*/
#define oqGetEmptyI(oqp) qSpaceI(oqp)
/**
* @brief Evaluates to @p TRUE if the specified output queue is empty.
*
* @param[in] oqp pointer to an @p output_queue_t structure.
* @return The queue status.
* @retval FALSE if the queue is not empty.
* @retval TRUE if the queue is empty.
*
* @iclass
*/
#define oqIsEmptyI(oqp) ((bool)(((oqp)->q_wrptr == (oqp)->q_rdptr) && \
((oqp)->q_counter != 0)))
/**
* @brief Evaluates to @p TRUE if the specified output queue is full.
*
* @param[in] oqp pointer to an @p output_queue_t structure.
* @return The queue status.
* @retval FALSE if the queue is not full.
* @retval TRUE if the queue is full.
*
* @iclass
*/
#define oqIsFullI(oqp) ((bool)(qSpaceI(oqp) <= 0))
/**
* @brief Output queue write.
* @details This function writes a byte value to an output queue. If the queue
* is full then the calling thread is suspended until there is space
* in the queue.
*
* @param[in] oqp pointer to an @p output_queue_t structure
* @param[in] b the byte value to be written in the queue
* @return The operation status.
* @retval Q_OK if the operation succeeded.
* @retval Q_RESET if the queue has been reset.
*
* @api
*/
#define oqPut(oqp, b) oqPutTimeout(oqp, b, TIME_INFINITE)
/** @} */
/**
* @brief Data part of a static output queue initializer.
* @details This macro should be used when statically initializing an
* output queue that is part of a bigger structure.
*
* @param[in] name the name of the output queue variable
* @param[in] buffer pointer to the queue buffer area
* @param[in] size size of the queue buffer area
* @param[in] onotify output notification callback pointer
* @param[in] link application defined pointer
*/
#define _OUTPUTQUEUE_DATA(name, buffer, size, onotify, link) { \
NULL, \
(size), \
(uint8_t *)(buffer), \
(uint8_t *)(buffer) + (size), \
(uint8_t *)(buffer), \
(uint8_t *)(buffer), \
(onotify), \
(link) \
}
/**
* @brief Static output queue initializer.
* @details Statically initialized output queues require no explicit
* initialization using @p oqInit().
*
* @param[in] name the name of the output queue variable
* @param[in] buffer pointer to the queue buffer area
* @param[in] size size of the queue buffer area
* @param[in] onotify output notification callback pointer
* @param[in] link application defined pointer
*/
#define OUTPUTQUEUE_DECL(name, buffer, size, onotify, link) \
output_queue_t name = _OUTPUTQUEUE_DATA(name, buffer, size, onotify, link)
#ifdef __cplusplus
extern "C" {
#endif
void iqObjectInit(input_queue_t *iqp, uint8_t *bp, size_t size,
qnotify_t infy, void *link);
void iqResetI(input_queue_t *iqp);
msg_t iqPutI(input_queue_t *iqp, uint8_t b);
msg_t iqGetTimeout(input_queue_t *iqp, systime_t time);
size_t iqReadTimeout(input_queue_t *iqp, uint8_t *bp,
size_t n, systime_t time);
void oqObjectInit(output_queue_t *oqp, uint8_t *bp, size_t size,
qnotify_t onfy, void *link);
void oqResetI(output_queue_t *oqp);
msg_t oqPutTimeout(output_queue_t *oqp, uint8_t b, systime_t time);
msg_t oqGetI(output_queue_t *oqp);
size_t oqWriteTimeout(output_queue_t *oqp, const uint8_t *bp,
size_t n, systime_t time);
#ifdef __cplusplus
}
#endif
#else /* defined(_CHIBIOS_RT_) && CH_CFG_USE_QUEUES */
/* If ChibiOS is being used and its own queues subsystem is activated then
this module will use the ChibiOS queues code.*/
#define qSizeI(qp) chQSizeI(qp)
#define qSpaceI(qp) chQSpaceI(qp)
#define qGetLink(qp) chQGetLinkX(qp)
#define iqGetFullI(iqp) chIQGetFullI(iqp)
#define iqGetEmptyI(iqp) chIQGetEmptyI(iqp)
#define iqIsEmptyI(iqp) chIQIsEmptyI(iqp)
#define iqIsFullI(iqp) chIQIsFullI(iqp)
#define iqGet(iqp) chIQGet(iqp)
#define oqGetFullI(oqp) chOQGetFullI(oqp)
#define oqGetEmptyI(oqp) chOQGetEmptyI(oqp)
#define oqIsEmptyI(oqp) chOQIsEmptyI(oqp)
#define oqIsFullI(oqp) chOQIsFullI(oqp)
#define oqPut(oqp, b) chOQPut(oqp, b)
#define iqObjectInit(iqp, bp, size, infy, link) \
chIQObjectInit(iqp, bp, size, infy, link)
#define iqResetI(iqp) chIQResetI(iqp)
#define iqPutI(iqp, b) chIQPutI(iqp, b)
#define iqGetTimeout(iqp, time) chIQGetTimeout(iqp, time)
#define iqReadTimeout(iqp, bp, n, time) chIQReadTimeout(iqp, bp, n, time)
#define oqObjectInit(oqp, bp, size, onfy, link) \
chOQObjectInit(oqp, bp, size, onfy, link)
#define oqResetI(oqp) chOQResetI(oqp)
#define oqPutTimeout(oqp, b, time) chOQPutTimeout(oqp, b, time)
#define oqGetI(oqp) chOQGetI(oqp)
#define oqWriteTimeout(oqp, bp, n, time) chOQWriteTimeout(oqp, bp, n, time)
#endif /* defined(_CHIBIOS_RT_) && CH_CFG_USE_QUEUES */
#endif /* _HAL_QUEUES_H_ */
/** @} */
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