265 lines
12 KiB
C
265 lines
12 KiB
C
/**
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* Copyright (c) 2012 - 2017, Nordic Semiconductor ASA
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*
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without modification,
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* are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form, except as embedded into a Nordic
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* Semiconductor ASA integrated circuit in a product or a software update for
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* such product, must reproduce the above copyright notice, this list of
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* conditions and the following disclaimer in the documentation and/or other
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* materials provided with the distribution.
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*
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* 3. Neither the name of Nordic Semiconductor ASA nor the names of its
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* contributors may be used to endorse or promote products derived from this
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* software without specific prior written permission.
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*
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* 4. This software, with or without modification, must only be used with a
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* Nordic Semiconductor ASA integrated circuit.
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*
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* 5. Any software provided in binary form under this license must not be reverse
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* engineered, decompiled, modified and/or disassembled.
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*
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* THIS SOFTWARE IS PROVIDED BY NORDIC SEMICONDUCTOR ASA "AS IS" AND ANY EXPRESS
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* OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY, NONINFRINGEMENT, AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL NORDIC SEMICONDUCTOR ASA OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
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* GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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*/
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/** @file
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*
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* @defgroup app_timer Application Timer
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* @{
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* @ingroup app_common
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*
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* @brief Application timer functionality.
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*
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* @details This module enables the application to create multiple timer instances based on the RTC1
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* peripheral. Checking for time-outs and invocation of user time-out handlers is performed
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* in the RTC1 interrupt handler. List handling is done using a software interrupt (SWI0).
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* Both interrupt handlers are running in APP_LOW priority level.
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*
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* @details When calling app_timer_start() or app_timer_stop(), the timer operation is just queued,
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* and the software interrupt is triggered. The actual timer start/stop operation is
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* executed by the SWI0 interrupt handler. Since the SWI0 interrupt is running in APP_LOW,
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* if the application code calling the timer function is running in APP_LOW or APP_HIGH,
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* the timer operation will not be performed until the application handler has returned.
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* This will be the case, for example, when stopping a timer from a time-out handler when not using
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* the scheduler.
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*
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* @details Use the USE_SCHEDULER parameter of the APP_TIMER_INIT() macro to select if the
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* @ref app_scheduler should be used or not. Even if the scheduler is
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* not used, app_timer.h will include app_scheduler.h, so when
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* compiling, app_scheduler.h must be available in one of the compiler include paths.
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*/
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#ifndef APP_TIMER_H__
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#define APP_TIMER_H__
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#include "sdk_config.h"
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#include "app_error.h"
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#include "app_util.h"
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#include "compiler_abstraction.h"
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#include "nordic_common.h"
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#include <stdint.h>
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#include <stdbool.h>
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#include <stdio.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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#define APP_TIMER_CLOCK_FREQ 32768 /**< Clock frequency of the RTC timer used to implement the app timer module. */
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#define APP_TIMER_MIN_TIMEOUT_TICKS 5 /**< Minimum value of the timeout_ticks parameter of app_timer_start(). */
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#ifdef RTX
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#define APP_TIMER_NODE_SIZE 40 /**< Size of app_timer.timer_node_t (used to allocate data). */
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#else
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#define APP_TIMER_NODE_SIZE 32 /**< Size of app_timer.timer_node_t (used to allocate data). */
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#endif // RTX
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#define APP_TIMER_SCHED_EVENT_DATA_SIZE sizeof(app_timer_event_t) /**< Size of event data when scheduler is used. */
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/**@brief Convert milliseconds to timer ticks.
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*
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* This macro uses 64-bit integer arithmetic, but as long as the macro parameters are
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* constants (i.e. defines), the computation will be done by the preprocessor.
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*
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* @param[in] MS Milliseconds.
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*
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* @return Number of timer ticks.
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*/
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#ifndef FREERTOS
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#define APP_TIMER_TICKS(MS) \
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((uint32_t)ROUNDED_DIV( \
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(MS) * (uint64_t)APP_TIMER_CLOCK_FREQ, \
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1000 * (APP_TIMER_CONFIG_RTC_FREQUENCY + 1)))
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#else
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#include "FreeRTOSConfig.h"
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#define APP_TIMER_TICKS(MS) (uint32_t)ROUNDED_DIV((MS)*configTICK_RATE_HZ,1000)
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#endif
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typedef struct app_timer_t { uint32_t data[CEIL_DIV(APP_TIMER_NODE_SIZE, sizeof(uint32_t))]; } app_timer_t;
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/**@brief Timer ID type.
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* Never declare a variable of this type, but use the macro @ref APP_TIMER_DEF instead.*/
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typedef app_timer_t * app_timer_id_t;
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/**
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* @brief Create a timer identifier and statically allocate memory for the timer.
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*
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* @param timer_id Name of the timer identifier variable that will be used to control the timer.
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*/
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#define APP_TIMER_DEF(timer_id) \
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static app_timer_t CONCAT_2(timer_id,_data) = { {0} }; \
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static const app_timer_id_t timer_id = &CONCAT_2(timer_id,_data)
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/**@brief Application time-out handler type. */
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typedef void (*app_timer_timeout_handler_t)(void * p_context);
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/**@brief Structure passed to app_scheduler. */
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typedef struct
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{
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app_timer_timeout_handler_t timeout_handler;
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void * p_context;
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} app_timer_event_t;
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/**@brief Timer modes. */
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typedef enum
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{
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APP_TIMER_MODE_SINGLE_SHOT, /**< The timer will expire only once. */
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APP_TIMER_MODE_REPEATED /**< The timer will restart each time it expires. */
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} app_timer_mode_t;
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/**@brief Function for initializing the timer module.
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*
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* @retval NRF_SUCCESS If the module was initialized successfully.
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*/
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ret_code_t app_timer_init(void);
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/**@brief Function for creating a timer instance.
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*
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* @param[in] p_timer_id Pointer to timer identifier.
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* @param[in] mode Timer mode.
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* @param[in] timeout_handler Function to be executed when the timer expires.
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*
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* @retval NRF_SUCCESS If the timer was successfully created.
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* @retval NRF_ERROR_INVALID_PARAM If a parameter was invalid.
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* @retval NRF_ERROR_INVALID_STATE If the application timer module has not been initialized or
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* the timer is running.
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*
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* @note This function does the timer allocation in the caller's context. It is also not protected
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* by a critical region. Therefore care must be taken not to call it from several interrupt
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* levels simultaneously.
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* @note The function can be called again on the timer instance and will re-initialize the instance if
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* the timer is not running.
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* @attention The FreeRTOS and RTX app_timer implementation does not allow app_timer_create to
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* be called on the previously initialized instance.
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*/
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ret_code_t app_timer_create(app_timer_id_t const * p_timer_id,
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app_timer_mode_t mode,
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app_timer_timeout_handler_t timeout_handler);
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/**@brief Function for starting a timer.
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*
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* @param[in] timer_id Timer identifier.
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* @param[in] timeout_ticks Number of ticks (of RTC1, including prescaling) to time-out event
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* (minimum 5 ticks).
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* @param[in] p_context General purpose pointer. Will be passed to the time-out handler when
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* the timer expires.
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*
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* @retval NRF_SUCCESS If the timer was successfully started.
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* @retval NRF_ERROR_INVALID_PARAM If a parameter was invalid.
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* @retval NRF_ERROR_INVALID_STATE If the application timer module has not been initialized or the timer
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* has not been created.
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* @retval NRF_ERROR_NO_MEM If the timer operations queue was full.
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*
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* @note The minimum timeout_ticks value is 5.
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* @note For multiple active timers, time-outs occurring in close proximity to each other (in the
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* range of 1 to 3 ticks) will have a positive jitter of maximum 3 ticks.
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* @note When calling this method on a timer that is already running, the second start operation
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* is ignored.
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*/
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ret_code_t app_timer_start(app_timer_id_t timer_id, uint32_t timeout_ticks, void * p_context);
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/**@brief Function for stopping the specified timer.
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*
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* @param[in] timer_id Timer identifier.
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*
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* @retval NRF_SUCCESS If the timer was successfully stopped.
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* @retval NRF_ERROR_INVALID_PARAM If a parameter was invalid.
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* @retval NRF_ERROR_INVALID_STATE If the application timer module has not been initialized or the timer
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* has not been created.
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* @retval NRF_ERROR_NO_MEM If the timer operations queue was full.
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*/
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ret_code_t app_timer_stop(app_timer_id_t timer_id);
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/**@brief Function for stopping all running timers.
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*
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* @retval NRF_SUCCESS If all timers were successfully stopped.
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* @retval NRF_ERROR_INVALID_STATE If the application timer module has not been initialized.
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* @retval NRF_ERROR_NO_MEM If the timer operations queue was full.
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*/
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ret_code_t app_timer_stop_all(void);
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/**@brief Function for returning the current value of the RTC1 counter.
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*
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* @return Current value of the RTC1 counter.
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*/
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uint32_t app_timer_cnt_get(void);
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/**@brief Function for computing the difference between two RTC1 counter values.
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*
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* @param[in] ticks_to Value returned by app_timer_cnt_get().
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* @param[in] ticks_from Value returned by app_timer_cnt_get().
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*
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* @return Number of ticks from ticks_from to ticks_to.
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*/
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uint32_t app_timer_cnt_diff_compute(uint32_t ticks_to,
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uint32_t ticks_from);
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/**@brief Function for getting the maximum observed operation queue utilization.
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*
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* Function for tuning the module and determining OP_QUEUE_SIZE value and thus module RAM usage.
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*
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* @note APP_TIMER_WITH_PROFILER must be enabled to use this functionality.
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*
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* @return Maximum number of events in queue observed so far.
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*/
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uint8_t app_timer_op_queue_utilization_get(void);
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/**
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* @brief Function for pausing RTC activity which drives app_timer.
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*
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* @note This function can be used for debugging purposes to ensure
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* that application is halted when entering a breakpoint.
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*/
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void app_timer_pause(void);
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/**
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* @brief Function for resuming RTC activity which drives app_timer.
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*
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* @note This function can be used for debugging purposes to resume
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* application activity.
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*/
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void app_timer_resume(void);
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#ifdef __cplusplus
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}
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#endif
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#endif // APP_TIMER_H__
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/** @} */
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