| /* Copyright (c) 2017 - 2018, Nordic Semiconductor ASA |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions are met: |
| * |
| * 1. Redistributions of source code must retain the above copyright notice, this |
| * list of conditions and the following disclaimer. |
| * |
| * 2. Redistributions in binary form must reproduce the above copyright notice, |
| * this list of conditions and the following disclaimer in the documentation |
| * and/or other materials provided with the distribution. |
| * |
| * 3. Neither the name of Nordic Semiconductor ASA nor the names of its |
| * contributors may be used to endorse or promote products derived from |
| * this software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
| * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
| * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE |
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| * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| * |
| */ |
| |
| /** |
| * @brief This module provides timer scheduling functionality for the 802.15.4 driver. |
| * |
| * Timer module should be used to implement strict timing features specified in IEEE 802.15.4 like: |
| * * CSL, |
| * * Timing out waiting for ACK frames, |
| * * CSMA/CA, |
| * * Inter-frame spacing: SIFS, LIFS (note that AIFS is implemented without using timer module). |
| * |
| * @note Current implementation supports only single one-shot timer. It may be extended to support |
| * timer scheduling and repetitive timers if needed. |
| */ |
| |
| #ifndef NRF_802154_TIMER_SCHED_H_ |
| #define NRF_802154_TIMER_SCHED_H_ |
| |
| #include <stdbool.h> |
| #include <stdint.h> |
| |
| #ifdef __cplusplus |
| extern "C" { |
| #endif |
| |
| /** |
| * @defgroup nrf_802154_timer_sched Timer Scheduler module for the 802.15.4 driver |
| * @{ |
| * @ingroup nrf_802154_timer_sched |
| * @brief Timer Scheduler module for the 802.15.4 driver. |
| * |
| */ |
| |
| /** |
| * @brief Type of function called when timer fires. |
| * |
| * @param[inout] p_context Pointer to user-defined memory location. May be NULL. |
| */ |
| typedef void (* nrf_802154_timer_callback_t)(void * p_context); |
| |
| /** |
| * @brief Type for driver instance. |
| */ |
| typedef struct nrf_802154_timer_s nrf_802154_timer_t; |
| |
| /** |
| * @brief Structure containing timer data used by timer module. |
| */ |
| struct nrf_802154_timer_s |
| { |
| uint32_t t0; ///< Base time of the timer [us] |
| uint32_t dt; ///< Timer expiration delta from @p t0 [us] |
| nrf_802154_timer_callback_t callback; ///< Callback function called when timer expires |
| void * p_context; ///< User-defined context passed to callback function |
| nrf_802154_timer_t * p_next; ///< A pointer to the next running timer |
| }; |
| |
| /** |
| * @brief Initialize the timer scheduler. |
| */ |
| void nrf_802154_timer_sched_init(void); |
| |
| /** |
| * @brief Deinitialize the timer scheduler. |
| */ |
| void nrf_802154_timer_sched_deinit(void); |
| |
| /** |
| * @brief Get current time. |
| * |
| * This function is useful to set base time in @sa nrf_802154_timer_t structure. |
| * |
| * @return Current time in microseconds [us]. |
| */ |
| uint32_t nrf_802154_timer_sched_time_get(void); |
| |
| /** |
| * @brief Get granularity of the timer that runs the timer scheduler. |
| * |
| * @return Granularity of the timer in microseconds [us]. |
| */ |
| uint32_t nrf_802154_timer_sched_granularity_get(void); |
| |
| /** |
| * @brief Check if given time is in future. |
| * |
| * @param[in] now Current time. @sa nrf_802154_timer_sched_time_get() |
| * @param[in] t0 Base of time compared with @p now. |
| * @param[in] dt Time delta from @p t0 compared with @p now. |
| * |
| * @retval true Given time @p t0 @p dt is in future (compared to given @p now). |
| * @retval false Given time @p t0 @p dt is not in future (compared to given @p now). |
| */ |
| bool nrf_802154_timer_sched_time_is_in_future(uint32_t now, uint32_t t0, uint32_t dt); |
| |
| /** |
| * @brief Get timer time remaining to expiration. |
| * |
| * @param[in] p_timer Pointer to the timer to check remaining time. |
| * |
| * @retval remaining time [us] or 0 if timer has already expired. |
| */ |
| uint32_t nrf_802154_timer_sched_remaining_time_get(const nrf_802154_timer_t * p_timer); |
| |
| /** |
| * @brief Start given timer and add it to the scheduler. |
| * |
| * @note Fields t0, dt, callback and p_context should be filled in @p p_timer prior to calling this |
| * function; callback field cannot be NULL. |
| * |
| * @note Due to timer granularity the callback function cannot be called exactly at specified time. |
| * Use @p round_up to specify if given timer should be expired before or after time given in |
| * the @p p_timer structure. The dt field of the @p p_timer is updated with the rounded up value. |
| * |
| * @param[inout] p_timer Pointer to the timer to start and add to the scheduler. |
| * @param[in] round_up True if timer should expire after specified time, false if it should |
| * expire before. |
| */ |
| void nrf_802154_timer_sched_add(nrf_802154_timer_t * p_timer, bool round_up); |
| |
| /** |
| * @brief Stop given timer and remove it from the scheduler. |
| * |
| * @param[inout] p_timer Pointer to the timer to stop and remove from the scheduler. |
| */ |
| void nrf_802154_timer_sched_remove(nrf_802154_timer_t * p_timer); |
| |
| /** |
| * @brief Check if given timer is already scheduled. |
| * |
| * @param[in] p_timer Pointer to the timer to check. |
| * |
| * @retval true Given timer is already scheduled. |
| * @retval false Given timer is not scheduled. |
| */ |
| bool nrf_802154_timer_sched_is_running(nrf_802154_timer_t * p_timer); |
| |
| /** |
| *@} |
| **/ |
| |
| #ifdef __cplusplus |
| } |
| #endif |
| |
| #endif /* NRF_802154_TIMER_SCHED_H_ */ |