219 lines
8.6 KiB
C
219 lines
8.6 KiB
C
/*
|
|
ChibiOS/RT - Copyright (C) 2006-2007 Giovanni Di Sirio.
|
|
|
|
This file is part of ChibiOS/RT.
|
|
|
|
ChibiOS/RT 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 queues.h I/O
|
|
* @brief Queues macros and structures.
|
|
* @addtogroup IOQueues
|
|
* @{
|
|
*/
|
|
|
|
#ifndef _QUEUES_H_
|
|
#define _QUEUES_H_
|
|
|
|
/** Queue notification callback type. */
|
|
typedef void (*qnotify_t)(void);
|
|
|
|
/** Returned by the queue functions if the operation is successful. */
|
|
#define Q_OK RDY_OK
|
|
/** Returned by the queue functions if a timeout occurs. */
|
|
#define Q_TIMEOUT RDY_TIMEOUT
|
|
/** Returned by the queue functions if the queue is reset. */
|
|
#define Q_RESET RDY_RESET
|
|
/** Returned by the queue functions if the queue is empty. */
|
|
#define Q_EMPTY -3
|
|
/** Returned by the queue functions if the queue is full. */
|
|
#define Q_FULL -4
|
|
|
|
#if CH_USE_QUEUES
|
|
/**
|
|
* @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.
|
|
*/
|
|
typedef struct {
|
|
uint8_t *q_buffer; /**< Pointer to the queue buffer.*/
|
|
uint8_t *q_top; /**< Pointer to the first location
|
|
after the buffer.*/
|
|
uint8_t *q_wrptr; /**< Write pointer.*/
|
|
uint8_t *q_rdptr; /**< Read pointer.*/
|
|
Semaphore q_sem; /**< Counter @p Semaphore.*/
|
|
qnotify_t q_notify; /**< Data notification callback.*/
|
|
} GenericQueue;
|
|
|
|
/** Returns the queue's buffer size. */
|
|
#define chQSize(q) ((q)->q_top - (q)->q_buffer)
|
|
|
|
/**
|
|
* Returns the used space if used on an Input Queue and the empty space if
|
|
* used on an Output Queue.
|
|
* @note The returned value can be less than zero when there are waiting
|
|
* threads on the internal semaphore.
|
|
*/
|
|
#define chQSpace(q) chSemGetCounterI(&(q)->q_sem)
|
|
|
|
/**
|
|
* @brief Input queue structure.
|
|
* @details This structure represents a generic asymmetrical input queue.
|
|
* Writing in 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.
|
|
* @extends GenericQueue
|
|
*/
|
|
typedef GenericQueue InputQueue;
|
|
|
|
/** Evaluates to @p TRUE if the specified Input Queue is empty. */
|
|
#define chIQIsEmpty(q) (chQSpace(q) <= 0)
|
|
|
|
/** Evaluates to @p TRUE if the specified Input Queue is full. */
|
|
#define chIQIsFull(q) (chQSpace(q) >= chQSize(q))
|
|
|
|
/**
|
|
* @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 InputQueue structure
|
|
* @return A byte value from the queue or:
|
|
* @retval Q_RESET if the queue was reset.
|
|
*/
|
|
#define chIQGet(iqp) chIQGetTimeout(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 name the name of the input queue variable
|
|
* @param buffer pointer to the queue buffer area
|
|
* @param size size of the queue buffer area
|
|
* @param inotify input notification callback pointer
|
|
*/
|
|
#define _INPUTQUEUE_DATA(name, buffer, size, inotify) { \
|
|
(uint8_t *)(buffer), \
|
|
(uint8_t *)(buffer) + size, \
|
|
(uint8_t *)(buffer), \
|
|
(uint8_t *)(buffer), \
|
|
_SEMAPHORE_DATA(name.q_sem, 0), \
|
|
inotify \
|
|
}
|
|
|
|
/**
|
|
* @brief Static input queue initializer.
|
|
* @details Statically initialized input queues require no explicit
|
|
* initialization using @p chIQInit().
|
|
* @param name the name of the input queue variable
|
|
* @param buffer pointer to the queue buffer area
|
|
* @param size size of the queue buffer area
|
|
* @param inotify input notification callback pointer
|
|
*/
|
|
#define INPUTQUEUE_DECL(name, buffer, size, inotify) \
|
|
InputQueue name = _INPUTQUEUE_DATA(name, buffer, size, inotify)
|
|
|
|
/**
|
|
* @brief 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.
|
|
* @extends GenericQueue
|
|
*/
|
|
typedef GenericQueue OutputQueue;
|
|
|
|
/** Evaluates to @p TRUE if the specified Output Queue is empty. */
|
|
#define chOQIsEmpty(q) (chQSpace(q) >= chQSize(q))
|
|
|
|
/** Evaluates to @p TRUE if the specified Output Queue is full. */
|
|
#define chOQIsFull(q) (chQSpace(q) <= 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 OutputQueue 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 was reset.
|
|
*/
|
|
#define chOQPut(oqp, b) chOQPutTimeout(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 name the name of the output queue variable.
|
|
* @param buffer pointer to the queue buffer area
|
|
* @param size size of the queue buffer area
|
|
* @param onotify output notification callback pointer
|
|
*/
|
|
#define _OUTPUTQUEUE_DATA(name, buffer, size, onotify) { \
|
|
(uint8_t *)(buffer), \
|
|
(uint8_t *)(buffer) + size, \
|
|
(uint8_t *)(buffer), \
|
|
(uint8_t *)(buffer), \
|
|
_SEMAPHORE_DATA(name.q_sem, size), \
|
|
onotify \
|
|
}
|
|
|
|
/**
|
|
* @brief Static output queue initializer.
|
|
* @details Statically initialized output queues require no explicit
|
|
* initialization using @p chOQInit().
|
|
* @param name the name of the output queue variable
|
|
* @param buffer pointer to the queue buffer area
|
|
* @param size size of the queue buffer area
|
|
* @param onotify output notification callback pointer
|
|
*/
|
|
#define OUTPUTQUEUE_DECL(name, buffer, size, onotify) \
|
|
InputQueue name = _OUTPUTQUEUE_DATA(name, buffer, size, onotify)
|
|
|
|
#ifdef __cplusplus
|
|
extern "C" {
|
|
#endif
|
|
void chIQInit(InputQueue *qp, uint8_t *buffer, size_t size, qnotify_t inotify);
|
|
void chIQResetI(InputQueue *qp);
|
|
msg_t chIQPutI(InputQueue *qp, uint8_t b);
|
|
msg_t chIQGetTimeout(InputQueue *qp, systime_t timeout);
|
|
size_t chIQRead(InputQueue *qp, uint8_t *buffer, size_t n);
|
|
|
|
void chOQInit(OutputQueue *queue, uint8_t *buffer, size_t size, qnotify_t onotify);
|
|
void chOQResetI(OutputQueue *queue);
|
|
msg_t chOQPutTimeout(OutputQueue *queue, uint8_t b, systime_t timeout);
|
|
msg_t chOQGetI(OutputQueue *queue);
|
|
size_t chOQWrite(OutputQueue *queue, uint8_t *buffer, size_t n);
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|
|
#endif /* CH_USE_QUEUES */
|
|
|
|
#endif /* _QUEUES_H_ */
|
|
|
|
/** @} */
|