418 lines
13 KiB
C
418 lines
13 KiB
C
/*
|
|
ChibiOS - Copyright (C) 2006..2015 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.c
|
|
* @brief I/O Queues code.
|
|
*
|
|
* @addtogroup HAL_QUEUES
|
|
* @details Queues are mostly used in serial-like device drivers.
|
|
* Serial device drivers are usually designed to have a lower side
|
|
* (lower driver, it is usually an interrupt service routine) and an
|
|
* upper side (upper driver, accessed by the application threads).<br>
|
|
* There are several kind of queues:<br>
|
|
* - <b>Input queue</b>, unidirectional queue where the writer is the
|
|
* lower side and the reader is the upper side.
|
|
* - <b>Output queue</b>, unidirectional queue where the writer is the
|
|
* upper side and the reader is the lower side.
|
|
* - <b>Full duplex queue</b>, bidirectional queue. Full duplex queues
|
|
* are implemented by pairing an input queue and an output queue
|
|
* together.
|
|
* .
|
|
* @{
|
|
*/
|
|
|
|
#include "hal.h"
|
|
|
|
#if !defined(_CHIBIOS_RT_) || (CH_CFG_USE_QUEUES == FALSE) || \
|
|
defined(__DOXYGEN__)
|
|
|
|
/**
|
|
* @brief Initializes an input queue.
|
|
* @details A Semaphore is internally initialized and works as a counter of
|
|
* the bytes contained in the queue.
|
|
* @note The callback is invoked from within the S-Locked system state.
|
|
*
|
|
* @param[out] iqp pointer to an @p input_queue_t structure
|
|
* @param[in] bp pointer to a memory area allocated as queue buffer
|
|
* @param[in] size size of the queue buffer
|
|
* @param[in] infy pointer to a callback function that is invoked when
|
|
* data is read from the queue. The value can be @p NULL.
|
|
* @param[in] link application defined pointer
|
|
*
|
|
* @init
|
|
*/
|
|
void iqObjectInit(input_queue_t *iqp, uint8_t *bp, size_t size,
|
|
qnotify_t infy, void *link) {
|
|
|
|
osalThreadQueueObjectInit(&iqp->q_waiting);
|
|
iqp->q_counter = 0;
|
|
iqp->q_buffer = bp;
|
|
iqp->q_rdptr = bp;
|
|
iqp->q_wrptr = bp;
|
|
iqp->q_top = bp + size;
|
|
iqp->q_notify = infy;
|
|
iqp->q_link = link;
|
|
}
|
|
|
|
/**
|
|
* @brief Resets an input queue.
|
|
* @details All the data in the input queue is erased and lost, any waiting
|
|
* thread is resumed with status @p Q_RESET.
|
|
* @note A reset operation can be used by a low level driver in order to
|
|
* obtain immediate attention from the high level layers.
|
|
*
|
|
* @param[in] iqp pointer to an @p input_queue_t structure
|
|
*
|
|
* @iclass
|
|
*/
|
|
void iqResetI(input_queue_t *iqp) {
|
|
|
|
osalDbgCheckClassI();
|
|
|
|
iqp->q_rdptr = iqp->q_buffer;
|
|
iqp->q_wrptr = iqp->q_buffer;
|
|
iqp->q_counter = 0;
|
|
osalThreadDequeueAllI(&iqp->q_waiting, Q_RESET);
|
|
}
|
|
|
|
/**
|
|
* @brief Input queue write.
|
|
* @details A byte value is written into the low end of an input queue.
|
|
*
|
|
* @param[in] iqp pointer to an @p input_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 has been completed with success.
|
|
* @retval Q_FULL if the queue is full and the operation cannot be
|
|
* completed.
|
|
*
|
|
* @iclass
|
|
*/
|
|
msg_t iqPutI(input_queue_t *iqp, uint8_t b) {
|
|
|
|
osalDbgCheckClassI();
|
|
|
|
if (iqIsFullI(iqp)) {
|
|
return Q_FULL;
|
|
}
|
|
|
|
iqp->q_counter++;
|
|
*iqp->q_wrptr++ = b;
|
|
if (iqp->q_wrptr >= iqp->q_top) {
|
|
iqp->q_wrptr = iqp->q_buffer;
|
|
}
|
|
|
|
osalThreadDequeueNextI(&iqp->q_waiting, Q_OK);
|
|
|
|
return Q_OK;
|
|
}
|
|
|
|
/**
|
|
* @brief Input queue read with timeout.
|
|
* @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 or a timeout occurs.
|
|
* @note The callback is invoked before reading the character from the
|
|
* buffer or before entering the state @p THD_STATE_WTQUEUE.
|
|
*
|
|
* @param[in] iqp pointer to an @p input_queue_t structure
|
|
* @param[in] timeout the number of ticks before the operation timeouts,
|
|
* the following special values are allowed:
|
|
* - @a TIME_IMMEDIATE immediate timeout.
|
|
* - @a TIME_INFINITE no timeout.
|
|
* .
|
|
* @return A byte value from the queue.
|
|
* @retval Q_TIMEOUT if the specified time expired.
|
|
* @retval Q_RESET if the queue has been reset.
|
|
*
|
|
* @api
|
|
*/
|
|
msg_t iqGetTimeout(input_queue_t *iqp, systime_t timeout) {
|
|
uint8_t b;
|
|
|
|
osalSysLock();
|
|
if (iqp->q_notify != NULL) {
|
|
iqp->q_notify(iqp);
|
|
}
|
|
|
|
while (iqIsEmptyI(iqp)) {
|
|
msg_t msg = osalThreadEnqueueTimeoutS(&iqp->q_waiting, timeout);
|
|
if (msg < Q_OK) {
|
|
osalSysUnlock();
|
|
return msg;
|
|
}
|
|
}
|
|
|
|
iqp->q_counter--;
|
|
b = *iqp->q_rdptr++;
|
|
if (iqp->q_rdptr >= iqp->q_top) {
|
|
iqp->q_rdptr = iqp->q_buffer;
|
|
}
|
|
osalSysUnlock();
|
|
|
|
return (msg_t)b;
|
|
}
|
|
|
|
/**
|
|
* @brief Input queue read with timeout.
|
|
* @details The function reads data from an input queue into a buffer. The
|
|
* operation completes when the specified amount of data has been
|
|
* transferred or after the specified timeout or if the queue has
|
|
* been reset.
|
|
* @note The function is not atomic, if you need atomicity it is suggested
|
|
* to use a semaphore or a mutex for mutual exclusion.
|
|
* @note The callback is invoked before reading each character from the
|
|
* buffer or before entering the state @p THD_STATE_WTQUEUE.
|
|
*
|
|
* @param[in] iqp pointer to an @p input_queue_t structure
|
|
* @param[out] bp pointer to the data buffer
|
|
* @param[in] n the maximum amount of data to be transferred, the
|
|
* value 0 is reserved
|
|
* @param[in] timeout the number of ticks before the operation timeouts,
|
|
* the following special values are allowed:
|
|
* - @a TIME_IMMEDIATE immediate timeout.
|
|
* - @a TIME_INFINITE no timeout.
|
|
* .
|
|
* @return The number of bytes effectively transferred.
|
|
*
|
|
* @api
|
|
*/
|
|
size_t iqReadTimeout(input_queue_t *iqp, uint8_t *bp,
|
|
size_t n, systime_t timeout) {
|
|
qnotify_t nfy = iqp->q_notify;
|
|
size_t r = 0;
|
|
|
|
osalDbgCheck(n > 0U);
|
|
|
|
osalSysLock();
|
|
while (true) {
|
|
if (nfy != NULL) {
|
|
nfy(iqp);
|
|
}
|
|
|
|
while (iqIsEmptyI(iqp)) {
|
|
if (osalThreadEnqueueTimeoutS(&iqp->q_waiting, timeout) != Q_OK) {
|
|
osalSysUnlock();
|
|
return r;
|
|
}
|
|
}
|
|
|
|
iqp->q_counter--;
|
|
*bp++ = *iqp->q_rdptr++;
|
|
if (iqp->q_rdptr >= iqp->q_top) {
|
|
iqp->q_rdptr = iqp->q_buffer;
|
|
}
|
|
osalSysUnlock(); /* Gives a preemption chance in a controlled point.*/
|
|
|
|
r++;
|
|
if (--n == 0U) {
|
|
return r;
|
|
}
|
|
|
|
osalSysLock();
|
|
}
|
|
}
|
|
|
|
/**
|
|
* @brief Initializes an output queue.
|
|
* @details A Semaphore is internally initialized and works as a counter of
|
|
* the free bytes in the queue.
|
|
* @note The callback is invoked from within the S-Locked system state.
|
|
*
|
|
* @param[out] oqp pointer to an @p output_queue_t structure
|
|
* @param[in] bp pointer to a memory area allocated as queue buffer
|
|
* @param[in] size size of the queue buffer
|
|
* @param[in] onfy pointer to a callback function that is invoked when
|
|
* data is written to the queue. The value can be @p NULL.
|
|
* @param[in] link application defined pointer
|
|
*
|
|
* @init
|
|
*/
|
|
void oqObjectInit(output_queue_t *oqp, uint8_t *bp, size_t size,
|
|
qnotify_t onfy, void *link) {
|
|
|
|
osalThreadQueueObjectInit(&oqp->q_waiting);
|
|
oqp->q_counter = size;
|
|
oqp->q_buffer = bp;
|
|
oqp->q_rdptr = bp;
|
|
oqp->q_wrptr = bp;
|
|
oqp->q_top = bp + size;
|
|
oqp->q_notify = onfy;
|
|
oqp->q_link = link;
|
|
}
|
|
|
|
/**
|
|
* @brief Resets an output queue.
|
|
* @details All the data in the output queue is erased and lost, any waiting
|
|
* thread is resumed with status @p Q_RESET.
|
|
* @note A reset operation can be used by a low level driver in order to
|
|
* obtain immediate attention from the high level layers.
|
|
*
|
|
* @param[in] oqp pointer to an @p output_queue_t structure
|
|
*
|
|
* @iclass
|
|
*/
|
|
void oqResetI(output_queue_t *oqp) {
|
|
|
|
osalDbgCheckClassI();
|
|
|
|
oqp->q_rdptr = oqp->q_buffer;
|
|
oqp->q_wrptr = oqp->q_buffer;
|
|
oqp->q_counter = qSizeX(oqp);
|
|
osalThreadDequeueAllI(&oqp->q_waiting, Q_RESET);
|
|
}
|
|
|
|
/**
|
|
* @brief Output queue write with timeout.
|
|
* @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 or a timeout occurs.
|
|
* @note The callback is invoked after writing the character into the
|
|
* buffer.
|
|
*
|
|
* @param[in] oqp pointer to an @p output_queue_t structure
|
|
* @param[in] b the byte value to be written in the queue
|
|
* @param[in] timeout the number of ticks before the operation timeouts,
|
|
* the following special values are allowed:
|
|
* - @a TIME_IMMEDIATE immediate timeout.
|
|
* - @a TIME_INFINITE no timeout.
|
|
* .
|
|
* @return The operation status.
|
|
* @retval Q_OK if the operation succeeded.
|
|
* @retval Q_TIMEOUT if the specified time expired.
|
|
* @retval Q_RESET if the queue has been reset.
|
|
*
|
|
* @api
|
|
*/
|
|
msg_t oqPutTimeout(output_queue_t *oqp, uint8_t b, systime_t timeout) {
|
|
|
|
osalSysLock();
|
|
while (oqIsFullI(oqp)) {
|
|
msg_t msg = osalThreadEnqueueTimeoutS(&oqp->q_waiting, timeout);
|
|
if (msg < Q_OK) {
|
|
osalSysUnlock();
|
|
return msg;
|
|
}
|
|
}
|
|
|
|
oqp->q_counter--;
|
|
*oqp->q_wrptr++ = b;
|
|
if (oqp->q_wrptr >= oqp->q_top) {
|
|
oqp->q_wrptr = oqp->q_buffer;
|
|
}
|
|
|
|
if (oqp->q_notify != NULL) {
|
|
oqp->q_notify(oqp);
|
|
}
|
|
osalSysUnlock();
|
|
|
|
return Q_OK;
|
|
}
|
|
|
|
/**
|
|
* @brief Output queue read.
|
|
* @details A byte value is read from the low end of an output queue.
|
|
*
|
|
* @param[in] oqp pointer to an @p output_queue_t structure
|
|
* @return The byte value from the queue.
|
|
* @retval Q_EMPTY if the queue is empty.
|
|
*
|
|
* @iclass
|
|
*/
|
|
msg_t oqGetI(output_queue_t *oqp) {
|
|
uint8_t b;
|
|
|
|
osalDbgCheckClassI();
|
|
|
|
if (oqIsEmptyI(oqp)) {
|
|
return Q_EMPTY;
|
|
}
|
|
|
|
oqp->q_counter++;
|
|
b = *oqp->q_rdptr++;
|
|
if (oqp->q_rdptr >= oqp->q_top) {
|
|
oqp->q_rdptr = oqp->q_buffer;
|
|
}
|
|
|
|
osalThreadDequeueNextI(&oqp->q_waiting, Q_OK);
|
|
|
|
return (msg_t)b;
|
|
}
|
|
|
|
/**
|
|
* @brief Output queue write with timeout.
|
|
* @details The function writes data from a buffer to an output queue. The
|
|
* operation completes when the specified amount of data has been
|
|
* transferred or after the specified timeout or if the queue has
|
|
* been reset.
|
|
* @note The function is not atomic, if you need atomicity it is suggested
|
|
* to use a semaphore or a mutex for mutual exclusion.
|
|
* @note The callback is invoked after writing each character into the
|
|
* buffer.
|
|
*
|
|
* @param[in] oqp pointer to an @p output_queue_t structure
|
|
* @param[in] bp pointer to the data buffer
|
|
* @param[in] n the maximum amount of data to be transferred, the
|
|
* value 0 is reserved
|
|
* @param[in] timeout the number of ticks before the operation timeouts,
|
|
* the following special values are allowed:
|
|
* - @a TIME_IMMEDIATE immediate timeout.
|
|
* - @a TIME_INFINITE no timeout.
|
|
* .
|
|
* @return The number of bytes effectively transferred.
|
|
*
|
|
* @api
|
|
*/
|
|
size_t oqWriteTimeout(output_queue_t *oqp, const uint8_t *bp,
|
|
size_t n, systime_t timeout) {
|
|
qnotify_t nfy = oqp->q_notify;
|
|
size_t w = 0;
|
|
|
|
osalDbgCheck(n > 0U);
|
|
|
|
osalSysLock();
|
|
while (true) {
|
|
while (oqIsFullI(oqp)) {
|
|
if (osalThreadEnqueueTimeoutS(&oqp->q_waiting, timeout) != Q_OK) {
|
|
osalSysUnlock();
|
|
return w;
|
|
}
|
|
}
|
|
oqp->q_counter--;
|
|
*oqp->q_wrptr++ = *bp++;
|
|
if (oqp->q_wrptr >= oqp->q_top) {
|
|
oqp->q_wrptr = oqp->q_buffer;
|
|
}
|
|
|
|
if (nfy != NULL) {
|
|
nfy(oqp);
|
|
}
|
|
osalSysUnlock(); /* Gives a preemption chance in a controlled point.*/
|
|
|
|
w++;
|
|
if (--n == 0U) {
|
|
return w;
|
|
}
|
|
|
|
osalSysLock();
|
|
}
|
|
}
|
|
|
|
#endif /* !defined(_CHIBIOS_RT_) || (CH_USE_QUEUES == FALSE) */
|
|
|
|
/** @} */
|