AMiRo-OS

/*

AMiRo-OS is an operating system designed for the Autonomous Mini Robot (AMiRo) platform.

Copyright (C) 2016..2018  Thomas Schöpping et al.

This program 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.

This program 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    aos_timer.c

 * @brief   Timer code.

 * @details Implementation of aos_timer_t and aos_periodictimer_t functions.

 *

 * @addtogroup aos_timers

 * @{

 */

#include <aos_timer.h>

#include <aos_system.h>

/*

 * Forward declarations.

 */

static inline void _setupTimer(aos_timer_t* timer);

static inline void _setupPeriodicTimer(aos_periodictimer_t* ptimer);

static void _intermediateCb(void* timer);

static void _fireCb(void* timer);

static void _periodicCb(void* ptimer);

/**

 * @brief   Setup a timer according to its configuration.

 *

 * @param[in] timer   Pointer to the timer to setup.

 */

static inline void _setupTimer(aos_timer_t* timer)

{

  aos_timestamp_t uptime;

  // get current system uptime

  aosSysGetUptimeX(&uptime);

  // if the wakeup time is more than TIME_IMMEDIATE in the future

  if ( (timer->wkuptime > uptime) && ((timer->wkuptime - uptime) > TIME_IMMEDIATE) ) {

    // split the time delta if necessary

    if ((timer->wkuptime - uptime) > AOS_TIMER_MAX_INTERVAL_US) {

      chVTSetI(&(timer->vt), chTimeUS2I(AOS_TIMER_MAX_INTERVAL_US), _intermediateCb, timer);

    } else {

      chVTSetI(&(timer->vt), chTimeUS2I(timer->wkuptime - uptime), _fireCb, timer);

    }

  } else {

    vtfunc_t fn = timer->callback;

    timer->callback = NULL;

    fn(timer->cbparam);

  }

  return;

}

/**

 * @brief   Setup a periodic timer according to its configuration.

 *

 * @param[in] ptimer  Pointer to the periodic timer to setup.

 */

static inline void _setupPeriodicTimer(aos_periodictimer_t *ptimer)

{

  // if the periodic timer is being initialized

  if (ptimer->timer.wkuptime == 0) {

    aos_timestamp_t uptime;

    // get current system uptime

    aosSysGetUptimeX(&uptime);

    ptimer->timer.wkuptime = uptime + ptimer->interval;

  }

  // if the peridic timer is reactivated after it has fired

  else {

    ptimer->timer.wkuptime += ptimer->interval;

  }

  // set the callback and parameters

  ptimer->timer.callback = _periodicCb;

  ptimer->timer.cbparam = ptimer;

  // setup the timer

  _setupTimer(&(ptimer->timer));

  return;

}

/**

 * @brief   Callback function for intermediate interrupts.

 * @details This is required if the desired time to fire is too far in the future so that the interval must be split.

 *

 * @param[in] timer   Pointer to a aos_timer_t to reactivate.

 */

static void _intermediateCb(void* timer)

{

  chSysLockFromISR();

  _setupTimer((aos_timer_t*)timer);

  chSysUnlockFromISR();

}

/**

 * @brief   Callback function for the final fire event of the timer.

 *

 * @param[in] timer   Pointer to a aos_timer_t to call its callback.

 */

static void _fireCb(void *timer)

{

  chSysLockFromISR();

  ((aos_timer_t*)timer)->callback(((aos_timer_t*)timer)->cbparam);

  chSysUnlockFromISR();

}

/**

 * @brief   Callback function for periodic timer interrupts.

 * @details This function calls the original callback and reenables the timer afterwards.

 *

 * @param[in] ptimer  Pointer to a aos_periodictimer_t to reactivate.

 */

static void _periodicCb(void* ptimer)

{

  ((aos_periodictimer_t*)ptimer)->callback(((aos_periodictimer_t*)ptimer)->cbparam);

  _setupPeriodicTimer((aos_periodictimer_t*)ptimer);

}

/**

 * @brief   Initialize a aos_timer_t object.

 *

 * @param[in] timer   The timer to initialize.

 */

void aosTimerInit(aos_timer_t* timer)

{

  aosDbgAssert(timer != NULL);

  chVTObjectInit(&(timer->vt));

  timer->wkuptime = 0;

  timer->callback = NULL;

  timer->cbparam = NULL;

  return;

}

/**

 * @brief   Set timer to fire at an absolute system time.

 *

 * @param[in] timer   Pointer to the timer to set.

 * @param[in] uptime  Pointer to the absolute system time for the timer to fire.

 * @param[in] cb      Pointer to a callback function to be called.

 *                    In contrast to ChibiOS callback functions, this gets called from an already ISR locked context.

 *                    Thus it may not contain any chSysLockX() or chSysUnlockX() calls and so forth.

 * @param[in] par     Pointer to a parameter fpr the callback function (may be NULL).

 */

void aosTimerSetAbsoluteI(aos_timer_t *timer, aos_timestamp_t *uptime, vtfunc_t cb, void *par)

{

  aosDbgCheck(timer != NULL);

  aosDbgCheck(uptime != NULL);

  aosDbgCheck(cb != NULL);

  timer->wkuptime = *uptime;

  timer->callback = cb;

  timer->cbparam = par;

  _setupTimer(timer);

  return;

}

/**

 * @brief   Set timer to fire after a relative interval.

 *

 * @param[in] timer   Pointer to the timer to set.

 * @param[in] offset  Relative interval to set for the timer to fire.

 * @param[in] cb      Pointer to a callback function to be called.

 *                    In contrast to ChibiOS callback functions, this gets called from an already ISR locked context.

 *                    Thus it may not contain any chSysLockX() or chSysUnlockX() calls and so forth.

 * @param[in] par     Pointer to a parameter for the callback function (may be NULL).

 */

void aosTimerSetIntervalI(aos_timer_t *timer, aos_interval_t offset, vtfunc_t cb, void *par)

{

  aosDbgCheck(timer != NULL);

  aosDbgCheck(cb != NULL);

  aos_timestamp_t uptime;

  aosSysGetUptimeX(&uptime);

  timer->wkuptime = uptime + offset;

  timer->callback = cb;

  timer->cbparam = par;

  _setupTimer(timer);

  return;

}

/**

 * @brief   Set timer to fire after a long relative interval.

 *

 * @param[in] timer   Pointer to the timer to set.

 * @param[in] offset  Pointer to a long interval value to set for the timer to fire.

 * @param[in] cb      Pointer to a callback function to be called.

 *                    In contrast to ChibiOS callback functions, this gets called from an already ISR locked context.

 *                    Thus it may not contain any chSysLockX() or chSysUnlockX() calls and so forth.

 * @param[in] par     Pointer to a parameter for the callback function (may be NULL).

 */

void aosTimerSetLongIntervalI(aos_timer_t *timer, aos_longinterval_t *offset, vtfunc_t cb, void *par)

{

  aosDbgCheck(timer != NULL);

  aosDbgCheck(offset != NULL);

  aosDbgCheck(cb != NULL);

  aos_timestamp_t uptime;

  aosSysGetUptimeX(&uptime);

  timer->wkuptime = uptime + *offset;

  timer->callback = cb;

  timer->cbparam = par;

  _setupTimer(timer);

  return;

}

/**

 * @brief   Initialize a aos_periodictimer_t object.

 *

 * @param[in] timer   The periodic timer to initialize.

 */

void aosPeriodicTimerInit(aos_periodictimer_t *ptimer)

{

  aosDbgAssert(ptimer != NULL);

  aosTimerInit(&(ptimer->timer));

  ptimer->interval = 0;

  return;

}

/**

 * @brief   Set a periodic timer to fire in the specified interval.

 *

 * @param[in] ptimer    Pointer to the periodic timer to set.

 * @param[in] interval  Interval for the periodic timer to fire,

 * @param[in] cb        Pointer to a callback function to be called.

 *                      In contrast to ChibiOS callback functions, this gets called from an already ISR locked context.

 *                      Thus it may not contain any chSysLockX() or chSysUnlockX() calls and so forth.

 * @param[in] par       Pointer to a parameter for the callback function (may be NULL).

 */

void aosPeriodicTimerSetI(aos_periodictimer_t* ptimer, aos_interval_t interval, vtfunc_t cb, void* par)

{

  aosDbgCheck(ptimer != NULL);

  aosDbgCheck(interval > TIME_IMMEDIATE);

  aosDbgCheck(cb != NULL);

  ptimer->timer.wkuptime = 0;

  ptimer->interval = interval;

  ptimer->callback = cb;

  ptimer->cbparam = par;

  _setupPeriodicTimer(ptimer);

  return;

}

/**

 * @brief   Set a periodic timer to fire in the specified interval.

 *

 * @param[in] ptimer    Pointer to the periodic timer to set.

 * @param[in] interval  Pointer to a long interval value for the periodic timer to fire,

 * @param[in] cb        Pointer to a callback function to be called.

 *                      In contrast to other callback functions, this get called from an already ISR locked context.

 *                      This it may not contain any chSysLockX() or chSysUnlockX() calls.

 * @param[in] par       Pointer to a parameter for the callback function (may be NULL).

 */

void aosPeriodicTimerSetLongI(aos_periodictimer_t* ptimer, aos_longinterval_t* interval, vtfunc_t cb, void* par)

{

  aosDbgCheck(ptimer != NULL);

  aosDbgCheck(*interval > TIME_IMMEDIATE);

  aosDbgCheck(cb != NULL);

  ptimer->timer.wkuptime = 0;

  ptimer->interval = *interval;

  ptimer->callback = cb;

  ptimer->cbparam = par;

  _setupPeriodicTimer(ptimer);

  return;

}

/** @} */