/** * Copyright (c) 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, 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. * */ #ifndef DRV_RTC_H__ #define DRV_RTC_H__ #include #include #ifdef __cplusplus extern "C" { #endif /** * @defgroup drv_rtc RTC driver * @{ * @ingroup app_timer * @brief Real Timer Counter (RTC) peripheral driver for app_timer. */ /** @brief Maximum RTC counter value. */ #define DRV_RTC_MAX_CNT RTC_COUNTER_COUNTER_Msk /** @brief Time requires to update registers between RTC and MCU domains. */ #define DRV_RTC_CONFIG_APPLY_TIME_US 33 /** * @brief Minimum delta value between set value and counter value. * * RTC peripheral requires two ticks to be sure that value it properly set in RTC value. Compare * channel function requires additional one tick to avoid problematic situations (lack or additional * unspecified event) when Compare Channel register is reseting or setting to N+2 value. */ #define DRV_RTC_MIN_TICK_HANDLED 3 /** @brief Macro to convert microseconds into ticks. */ #define DRV_RTC_US_TO_TICKS(us,freq) (us >= 2^17 ? \ ((((us)/1000)*(freq))/1000U) : (((us)*(freq))/1000000U) ) /** @brief RTC driver instance structure. */ typedef struct { NRF_RTC_Type * p_reg; /**< Pointer to instance register set. */ IRQn_Type irq; /**< Instance IRQ ID. */ uint8_t instance_id; /**< Instance index. */ uint8_t cc_channel_count; /**< Number of capture/compare channels. */ } drv_rtc_t; /** @brief Macro for creating RTC driver instance.*/ #define DRV_RTC_INSTANCE(id) \ { \ .p_reg = NRFX_CONCAT_2(NRF_RTC, id), \ .irq = NRFX_CONCAT_3(RTC, id, _IRQn), \ .instance_id = NRFX_CONCAT_3(DRV_RTC_RTC, id, _INST_IDX), \ .cc_channel_count = NRF_RTC_CC_CHANNEL_COUNT(id), \ } enum { #if defined(APP_TIMER_V2_RTC0_ENABLED) DRV_RTC_RTC0_INST_IDX, #endif #if defined(APP_TIMER_V2_RTC1_ENABLED) DRV_RTC_RTC1_INST_IDX, #endif #if defined(APP_TIMER_V2_RTC2_ENABLED) DRV_RTC_RTC2_INST_IDX, #endif DRV_RTC_ENABLED_COUNT }; /** @brief RTC driver instance configuration structure. */ typedef struct { uint16_t prescaler; /**< Prescaler. */ uint8_t interrupt_priority; /**< Interrupt priority. */ } drv_rtc_config_t; /** @brief RTC instance default configuration. */ #define DRV_RTC_DEFAULT_CONFIG \ { \ .prescaler = RTC_FREQ_TO_PRESCALER(DRV_RTC_DEFAULT_CONFIG_FREQUENCY), \ .interrupt_priority = DRV_RTC_DEFAULT_CONFIG_IRQ_PRIORITY, \ } /** @brief RTC driver instance handler type. */ typedef void (*drv_rtc_handler_t)(drv_rtc_t const * const p_instance); /** * @brief Function for initializing the RTC driver instance. * * After initialization, the instance is in power off state. The LFCLK (@ref nrfx_clock) * has to be started before using @ref drv_rtc. * * @param[in] p_instance Pointer to the driver instance structure. * @param[in] p_config Pointer to the structure with initial configuration. * @param[in] handler Event handler provided by the user. Must not be NULL. * * @retval NRF_SUCCESS If successfully initialized. * @retval NRF_ERROR_INVALID_STATE If the instance is already initialized. */ ret_code_t drv_rtc_init(drv_rtc_t const * const p_instance, drv_rtc_config_t const * p_config, drv_rtc_handler_t handler); /** * @brief Function for uninitializing the RTC driver instance. * * After uninitialization, the instance is in idle state. The hardware should return to the state * before initialization. The function asserts if the instance is in idle state. * * @param[in] p_instance Pointer to the driver instance structure. */ void drv_rtc_uninit(drv_rtc_t const * const p_instance); /** * @brief Function for starting RTC clock. * * @param[in] p_instance Pointer to the driver instance structure. */ void drv_rtc_start(drv_rtc_t const * const p_instance); /** * @brief Function for stopping RTC clock. * * @param[in] p_instance Pointer to the driver instance structure. */ void drv_rtc_stop(drv_rtc_t const * const p_instance); /** * @brief Function for configuring compare channel. * * @note Function disables interrupts and only enable compare events. Remember to enable interrupt * using @ref drv_rtc_compare_enable in case of using it. * * @param[in] p_instance Pointer to the driver instance structure. * @param[in] cc Compare channel index. * @param[in] abs_value Absolute value to be set in the compare register. * @param[in] irq_enable True to enable interrupt. */ void drv_rtc_compare_set(drv_rtc_t const * const p_instance, uint32_t cc, uint32_t abs_value, bool irq_enable); /** * @brief Function for configuring compare channel with safe window. * * Maximum possible relative value is limited by safe window to detect * cases when requested compare event has already occured. * * @param[in] p_instance Pointer to the driver instance structure. * @param[in] cc Compare channel index. * @param[in] abs_value Absolute value to be set in the compare register. * @param[in] safe_window Width of the safe window. * * @retval NRF_ERROR_TIMEOUT If @par abs_value is in safe window of event occured before * enabling compare channel intterupt. * @retval NRF_SUCCESS If successfully set. */ ret_code_t drv_rtc_windowed_compare_set(drv_rtc_t const * const p_instance, uint32_t cc, uint32_t abs_value, uint32_t safe_window); /** * @brief Function for enabling overflow event and interrupt. * * @param[in] p_instance Pointer to the driver instance structure. * @param[in] irq_enable True to enable interrupt. */ void drv_rtc_overflow_enable(drv_rtc_t const * const p_instance, bool irq_enable); /** * @brief Function for diabling overflow event and interrupt. * * @param[in] p_instance Pointer to the driver instance structure. */ void drv_rtc_overflow_disable(drv_rtc_t const * const p_instance); /** * @brief Function for checking if overflow event has occured. * * @note Event is cleared after reading. * * @param[in] p_instance Pointer to the driver instance structure. * * @return True if interrupt pending, false otherwise. */ bool drv_rtc_overflow_pending(drv_rtc_t const * const p_instance); /** * @brief Function for enabling tick event and interrupt. * * @param[in] p_instance Pointer to the driver instance structure. * @param[in] irq_enable True to enable interrupt. */ void drv_rtc_tick_enable(drv_rtc_t const * const p_instance, bool irq_enable); /** * @brief Function for disabling tick event and interrupt. * * @param[in] p_instance Pointer to the driver instance structure. */ void drv_rtc_tick_disable(drv_rtc_t const * const p_instance); /** * @brief Function for checking if tick event has occured. * * @param[in] p_instance Pointer to the driver instance structure. * * @return True if interrupt pending, false otherwise. */ bool drv_rtc_tick_pending(drv_rtc_t const * const p_instance); /** * @brief Function for enabling compare channel event and interrupt. * * @param[in] p_instance Pointer to the driver instance structure. * @param[in] cc Compare channel index. * @param[in] irq_enable True to enable interrupt. */ void drv_rtc_compare_enable(drv_rtc_t const * const p_instance, uint32_t cc, bool irq_enable); /** * @brief Function for disabling compare channel event and interrupt. * * @param[in] p_instance Pointer to the driver instance structure. * @param[in] cc Compare channel index. */ void drv_rtc_compare_disable(drv_rtc_t const * const p_instance, uint32_t cc); /** * @brief Function for checking if compare channel event has occured. * * @param[in] p_instance Pointer to the driver instance structure. * @param[in] cc Compare channel index. * * @return True if interrupt pending, false otherwise. */ bool drv_rtc_compare_pending(drv_rtc_t const * const p_instance, uint32_t cc); /** * @brief Function for getting current value of RTC counter. * * @param[in] p_instance Pointer to the driver instance structure. * * @return Counter value. */ uint32_t drv_rtc_counter_get(drv_rtc_t const * const p_instance); /** * @brief Function for triggering RTC interrupt. * * @param[in] p_instance Pointer to the driver instance structure. */ void drv_rtc_irq_trigger(drv_rtc_t const * const p_instance); /** @} */ #ifdef __cplusplus } #endif #endif // DRV_RTC_H__