/** * Copyright (c) 2012 - 2017, 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, except as embedded into a Nordic * Semiconductor ASA integrated circuit in a product or a software update for * such product, 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. * * 4. This software, with or without modification, must only be used with a * Nordic Semiconductor ASA integrated circuit. * * 5. Any software provided in binary form under this license must not be reverse * engineered, decompiled, modified and/or disassembled. * * THIS SOFTWARE IS PROVIDED BY NORDIC SEMICONDUCTOR ASA "AS IS" AND ANY EXPRESS * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES * OF MERCHANTABILITY, NONINFRINGEMENT, AND FITNESS FOR A PARTICULAR PURPOSE ARE * DISCLAIMED. IN NO EVENT SHALL NORDIC SEMICONDUCTOR ASA OR CONTRIBUTORS BE * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, 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. * */ /** @file * * @defgroup app_timer Application Timer * @{ * @ingroup app_common * * @brief Application timer functionality. * * @details This module enables the application to create multiple timer instances based on the RTC1 * peripheral. Checking for time-outs and invocation of user time-out handlers is performed * in the RTC1 interrupt handler. List handling is done using a software interrupt (SWI0). * Both interrupt handlers are running in APP_LOW priority level. * * @details When calling app_timer_start() or app_timer_stop(), the timer operation is just queued, * and the software interrupt is triggered. The actual timer start/stop operation is * executed by the SWI0 interrupt handler. Since the SWI0 interrupt is running in APP_LOW, * if the application code calling the timer function is running in APP_LOW or APP_HIGH, * the timer operation will not be performed until the application handler has returned. * This will be the case, for example, when stopping a timer from a time-out handler when not using * the scheduler. * * @details Use the USE_SCHEDULER parameter of the APP_TIMER_INIT() macro to select if the * @ref app_scheduler should be used or not. Even if the scheduler is * not used, app_timer.h will include app_scheduler.h, so when * compiling, app_scheduler.h must be available in one of the compiler include paths. */ #ifndef APP_TIMER_H__ #define APP_TIMER_H__ #include "sdk_config.h" #include "app_error.h" #include "app_util.h" #include "compiler_abstraction.h" #include #include #include #ifdef __cplusplus extern "C" { #endif #define APP_TIMER_CLOCK_FREQ 32768 /**< Clock frequency of the RTC timer used to implement the app timer module. */ #define APP_TIMER_MIN_TIMEOUT_TICKS 5 /**< Minimum value of the timeout_ticks parameter of app_timer_start(). */ #ifdef RTX #define APP_TIMER_NODE_SIZE 40 /**< Size of app_timer.timer_node_t (used to allocate data). */ #else #define APP_TIMER_NODE_SIZE 32 /**< Size of app_timer.timer_node_t (used to allocate data). */ #endif // RTX #define APP_TIMER_SCHED_EVENT_DATA_SIZE sizeof(app_timer_event_t) /**< Size of event data when scheduler is used. */ /**@brief Convert milliseconds to timer ticks. * * This macro uses 64-bit integer arithmetic, but as long as the macro parameters are * constants (i.e. defines), the computation will be done by the preprocessor. * * @param[in] MS Milliseconds. * * @return Number of timer ticks. */ #ifndef FREERTOS #define APP_TIMER_TICKS(MS) \ ((uint32_t)ROUNDED_DIV( \ (MS) * (uint64_t)APP_TIMER_CLOCK_FREQ, \ 1000 * (APP_TIMER_CONFIG_RTC_FREQUENCY + 1))) #else #include "FreeRTOSConfig.h" #define APP_TIMER_TICKS(MS) (uint32_t)ROUNDED_DIV((MS)*configTICK_RATE_HZ,1000) #endif typedef struct app_timer_t { uint32_t data[CEIL_DIV(APP_TIMER_NODE_SIZE, sizeof(uint32_t))]; } app_timer_t; /**@brief Timer ID type. * Never declare a variable of this type, but use the macro @ref APP_TIMER_DEF instead.*/ typedef app_timer_t * app_timer_id_t; /** * @brief Create a timer identifier and statically allocate memory for the timer. * * @param timer_id Name of the timer identifier variable that will be used to control the timer. */ #define APP_TIMER_DEF(timer_id) \ static app_timer_t timer_id##_data = { {0} }; \ static const app_timer_id_t timer_id = &timer_id##_data /**@brief Application time-out handler type. */ typedef void (*app_timer_timeout_handler_t)(void * p_context); /**@brief Structure passed to app_scheduler. */ typedef struct { app_timer_timeout_handler_t timeout_handler; void * p_context; } app_timer_event_t; /**@brief Timer modes. */ typedef enum { APP_TIMER_MODE_SINGLE_SHOT, /**< The timer will expire only once. */ APP_TIMER_MODE_REPEATED /**< The timer will restart each time it expires. */ } app_timer_mode_t; /**@brief Function for initializing the timer module. * * @retval NRF_SUCCESS If the module was initialized successfully. */ ret_code_t app_timer_init(void); /**@brief Function for creating a timer instance. * * @param[in] p_timer_id Pointer to timer identifier. * @param[in] mode Timer mode. * @param[in] timeout_handler Function to be executed when the timer expires. * * @retval NRF_SUCCESS If the timer was successfully created. * @retval NRF_ERROR_INVALID_PARAM If a parameter was invalid. * @retval NRF_ERROR_INVALID_STATE If the application timer module has not been initialized or * the timer is running. * * @note This function does the timer allocation in the caller's context. It is also not protected * by a critical region. Therefore care must be taken not to call it from several interrupt * levels simultaneously. * @note The function can be called again on the timer instance and will re-initialize the instance if * the timer is not running. * @attention The FreeRTOS and RTX app_timer implementation does not allow app_timer_create to * be called on the previously initialized instance. */ ret_code_t app_timer_create(app_timer_id_t const * p_timer_id, app_timer_mode_t mode, app_timer_timeout_handler_t timeout_handler); /**@brief Function for starting a timer. * * @param[in] timer_id Timer identifier. * @param[in] timeout_ticks Number of ticks (of RTC1, including prescaling) to time-out event * (minimum 5 ticks). * @param[in] p_context General purpose pointer. Will be passed to the time-out handler when * the timer expires. * * @retval NRF_SUCCESS If the timer was successfully started. * @retval NRF_ERROR_INVALID_PARAM If a parameter was invalid. * @retval NRF_ERROR_INVALID_STATE If the application timer module has not been initialized or the timer * has not been created. * @retval NRF_ERROR_NO_MEM If the timer operations queue was full. * * @note The minimum timeout_ticks value is 5. * @note For multiple active timers, time-outs occurring in close proximity to each other (in the * range of 1 to 3 ticks) will have a positive jitter of maximum 3 ticks. * @note When calling this method on a timer that is already running, the second start operation * is ignored. */ ret_code_t app_timer_start(app_timer_id_t timer_id, uint32_t timeout_ticks, void * p_context); /**@brief Function for stopping the specified timer. * * @param[in] timer_id Timer identifier. * * @retval NRF_SUCCESS If the timer was successfully stopped. * @retval NRF_ERROR_INVALID_PARAM If a parameter was invalid. * @retval NRF_ERROR_INVALID_STATE If the application timer module has not been initialized or the timer * has not been created. * @retval NRF_ERROR_NO_MEM If the timer operations queue was full. */ ret_code_t app_timer_stop(app_timer_id_t timer_id); /**@brief Function for stopping all running timers. * * @retval NRF_SUCCESS If all timers were successfully stopped. * @retval NRF_ERROR_INVALID_STATE If the application timer module has not been initialized. * @retval NRF_ERROR_NO_MEM If the timer operations queue was full. */ ret_code_t app_timer_stop_all(void); /**@brief Function for returning the current value of the RTC1 counter. * * @return Current value of the RTC1 counter. */ uint32_t app_timer_cnt_get(void); /**@brief Function for computing the difference between two RTC1 counter values. * * @param[in] ticks_to Value returned by app_timer_cnt_get(). * @param[in] ticks_from Value returned by app_timer_cnt_get(). * * @return Number of ticks from ticks_from to ticks_to. */ uint32_t app_timer_cnt_diff_compute(uint32_t ticks_to, uint32_t ticks_from); /**@brief Function for getting the maximum observed operation queue utilization. * * Function for tuning the module and determining OP_QUEUE_SIZE value and thus module RAM usage. * * @note APP_TIMER_WITH_PROFILER must be enabled to use this functionality. * * @return Maximum number of events in queue observed so far. */ uint8_t app_timer_op_queue_utilization_get(void); /** * @brief Function for pausing RTC activity which drives app_timer. * * @note This function can be used for debugging purposes to ensure * that application is halted when entering a breakpoint. */ void app_timer_pause(void); /** * @brief Function for resuming RTC activity which drives app_timer. * * @note This function can be used for debugging purposes to resume * application activity. */ void app_timer_resume(void); #ifdef __cplusplus } #endif #endif // APP_TIMER_H__ /** @} */