299 lines
9.4 KiB
C
299 lines
9.4 KiB
C
|
/*
|
||
|
|
ChibiOS - Copyright (C) 2006..2016 Giovanni Di Sirio
|
||
|
|
|
||
|
|
Licensed under the Apache License, Version 2.0 (the "License");
|
||
|
|
you may not use this file except in compliance with the License.
|
||
|
|
You may obtain a copy of the License at
|
||
|
|
|
||
|
|
http://www.apache.org/licenses/LICENSE-2.0
|
||
|
|
|
||
|
|
Unless required by applicable law or agreed to in writing, software
|
||
|
|
distributed under the License is distributed on an "AS IS" BASIS,
|
||
|
|
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
||
|
|
See the License for the specific language governing permissions and
|
||
|
|
limitations under the License.
|
||
|
|
*/
|
||
|
|
|
||
|
|
/**
|
||
|
|
* @file hal_queues.h
|
||
|
|
* @brief I/O Queues macros and structures.
|
||
|
|
*
|
||
|
|
* @addtogroup HAL_QUEUES
|
||
|
|
* @{
|
||
|
|
*/
|
||
|
|
|
||
|
|
#ifndef HAL_QUEUES_H
|
||
|
|
#define HAL_QUEUES_H
|
||
|
|
|
||
|
|
/**
|
||
|
|
* @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 MSG_TIMEOUT /**< @brief Queue empty. */
|
||
|
|
#define Q_FULL MSG_TIMEOUT /**< @brief Queue full, */
|
||
|
|
/** @} */
|
||
|
|
|
||
|
|
/**
|
||
|
|
* @brief Type of a generic I/O queue structure.
|
||
|
|
*/
|
||
|
|
typedef struct io_queue io_queue_t;
|
||
|
|
|
||
|
|
/**
|
||
|
|
* @brief Queue notification callback type.
|
||
|
|
*
|
||
|
|
* @param[in] qp the queue pointer
|
||
|
|
*/
|
||
|
|
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 and is non-blocking.
|
||
|
|
*/
|
||
|
|
struct io_queue {
|
||
|
|
threads_queue_t q_waiting; /**< @brief Queue of waiting threads. */
|
||
|
|
volatile 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.
|
||
|
|
*
|
||
|
|
* @xclass
|
||
|
|
*/
|
||
|
|
#define qSizeX(qp) \
|
||
|
|
/*lint -save -e9033 [10.8] The cast is safe.*/ \
|
||
|
|
((size_t)((qp)->q_top - (qp)->q_buffer)) \
|
||
|
|
/*lint -restore*/
|
||
|
|
|
||
|
|
/**
|
||
|
|
* @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.
|
||
|
|
* 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) (qSizeX(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) == 0U))
|
||
|
|
|
||
|
|
/**
|
||
|
|
* @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) \
|
||
|
|
/*lint -save -e9007 [13.5] No side effects, a pointer is passed.*/ \
|
||
|
|
((bool)(((iqp)->q_wrptr == (iqp)->q_rdptr) && ((iqp)->q_counter != 0U))) \
|
||
|
|
/*lint -restore*/
|
||
|
|
|
||
|
|
/**
|
||
|
|
* @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 MSG_RESET if the queue has been reset.
|
||
|
|
*
|
||
|
|
* @api
|
||
|
|
*/
|
||
|
|
#define iqGet(iqp) iqGetTimeout(iqp, TIME_INFINITE)
|
||
|
|
/** @} */
|
||
|
|
|
||
|
|
/**
|
||
|
|
* @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.
|
||
|
|
* 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) (qSizeX(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) \
|
||
|
|
/*lint -save -e9007 [13.5] No side effects, a pointer is passed.*/ \
|
||
|
|
((bool)(((oqp)->q_wrptr == (oqp)->q_rdptr) && ((oqp)->q_counter != 0U))) \
|
||
|
|
/*lint -restore*/
|
||
|
|
|
||
|
|
/**
|
||
|
|
* @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) == 0U))
|
||
|
|
|
||
|
|
/**
|
||
|
|
* @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 MSG_OK if the operation succeeded.
|
||
|
|
* @retval MSG_RESET if the queue has been reset.
|
||
|
|
*
|
||
|
|
* @api
|
||
|
|
*/
|
||
|
|
#define oqPut(oqp, b) oqPutTimeout(oqp, b, TIME_INFINITE)
|
||
|
|
/** @} */
|
||
|
|
|
||
|
|
#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 timeout);
|
||
|
|
size_t iqReadTimeout(input_queue_t *iqp, uint8_t *bp,
|
||
|
|
size_t n, systime_t timeout);
|
||
|
|
|
||
|
|
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 timeout);
|
||
|
|
msg_t oqGetI(output_queue_t *oqp);
|
||
|
|
size_t oqWriteTimeout(output_queue_t *oqp, const uint8_t *bp,
|
||
|
|
size_t n, systime_t timeout);
|
||
|
|
#ifdef __cplusplus
|
||
|
|
}
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#endif /* HAL_QUEUES_H */
|
||
|
|
|
||
|
|
/** @} */
|