/* * Copyright (c) 2014 - 2020, 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 the copyright holder 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 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 NRFX_RTC_H__ #define NRFX_RTC_H__ #include #include #ifdef __cplusplus extern "C" { #endif /** * @defgroup nrfx_rtc RTC driver * @{ * @ingroup nrf_rtc * @brief Real Timer Counter (RTC) peripheral driver. */ /** @brief Macro for converting microseconds into ticks. */ #define NRFX_RTC_US_TO_TICKS(us,freq) (((us) * (freq)) / 1000000U) /** @brief RTC driver interrupt types. */ typedef enum { NRFX_RTC_INT_COMPARE0 = 0, /**< Interrupt from COMPARE0 event. */ NRFX_RTC_INT_COMPARE1 = 1, /**< Interrupt from COMPARE1 event. */ NRFX_RTC_INT_COMPARE2 = 2, /**< Interrupt from COMPARE2 event. */ NRFX_RTC_INT_COMPARE3 = 3, /**< Interrupt from COMPARE3 event. */ NRFX_RTC_INT_TICK = 4, /**< Interrupt from TICK event. */ NRFX_RTC_INT_OVERFLOW = 5 /**< Interrupt from OVERFLOW event. */ } nrfx_rtc_int_type_t; /** @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; /**< Index of the driver instance. For internal use only. */ uint8_t cc_channel_count; /**< Number of capture/compare channels. */ } nrfx_rtc_t; /** @brief Macro for creating an RTC driver instance. */ #define NRFX_RTC_INSTANCE(id) \ { \ .p_reg = NRFX_CONCAT_2(NRF_RTC, id), \ .irq = NRFX_CONCAT_3(RTC, id, _IRQn), \ .instance_id = NRFX_CONCAT_3(NRFX_RTC, id, _INST_IDX), \ .cc_channel_count = NRF_RTC_CC_CHANNEL_COUNT(id), \ } #ifndef __NRFX_DOXYGEN__ enum { #if NRFX_CHECK(NRFX_RTC0_ENABLED) NRFX_RTC0_INST_IDX, #endif #if NRFX_CHECK(NRFX_RTC1_ENABLED) NRFX_RTC1_INST_IDX, #endif #if NRFX_CHECK(NRFX_RTC2_ENABLED) NRFX_RTC2_INST_IDX, #endif NRFX_RTC_ENABLED_COUNT }; #endif /** @brief RTC driver instance configuration structure. */ typedef struct { uint16_t prescaler; /**< Prescaler. */ uint8_t interrupt_priority; /**< Interrupt priority. */ uint8_t tick_latency; /**< Maximum length of the interrupt handler in ticks (maximum 7.7 ms). */ bool reliable; /**< Reliable mode flag. */ } nrfx_rtc_config_t; /** * @brief RTC driver default configuration. * * This configuration sets up RTC with the following options: * - frequency 32.768 kHz * - maximum latency 2000 us * - reliability checks disabled */ #define NRFX_RTC_DEFAULT_CONFIG \ { \ .prescaler = RTC_FREQ_TO_PRESCALER(32768), \ .interrupt_priority = NRFX_RTC_DEFAULT_CONFIG_IRQ_PRIORITY, \ .tick_latency = NRFX_RTC_US_TO_TICKS(2000, 32768), \ .reliable = false, \ } /** @brief RTC driver instance handler type. */ typedef void (*nrfx_rtc_handler_t)(nrfx_rtc_int_type_t int_type); /** * @brief Function for initializing the RTC driver instance. * * After initialization, the instance is in power off state. * * @param[in] p_instance Pointer to the driver instance structure. * @param[in] p_config Pointer to the structure with the initial configuration. * @param[in] handler Event handler provided by the user. * Must not be NULL. * * @retval NRFX_SUCCESS Successfully initialized. * @retval NRFX_ERROR_INVALID_STATE The instance is already initialized. */ nrfx_err_t nrfx_rtc_init(nrfx_rtc_t const * p_instance, nrfx_rtc_config_t const * p_config, nrfx_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. * * @param[in] p_instance Pointer to the driver instance structure. */ void nrfx_rtc_uninit(nrfx_rtc_t const * p_instance); /** * @brief Function for enabling the RTC driver instance. * * @param[in] p_instance Pointer to the driver instance structure. */ void nrfx_rtc_enable(nrfx_rtc_t const * p_instance); /** * @brief Function for disabling the RTC driver instance. * * @param[in] p_instance Pointer to the driver instance structure. */ void nrfx_rtc_disable(nrfx_rtc_t const * p_instance); /** * @brief Function for setting a compare channel. * * The function powers on the instance if the instance was in power off state. * * The driver is not entering a critical section when configuring RTC, which means that it can be * preempted for a certain amount of time. When the driver was preempted and the value to be set * is short in time, there is a risk that the driver sets a compare value that is * behind. In this case, if the reliable mode is enabled for the specified instance, * the risk is handled. * However, to detect if the requested value is behind, this mode makes the following assumptions: * - The maximum preemption time in ticks (8-bit value) is known and is less than 7.7 ms * (for prescaler = 0, RTC frequency 32 kHz). * - The requested absolute compare value is not bigger than (0x00FFFFFF)-tick_latency. It is * the user's responsibility to ensure this. * * @param[in] p_instance Pointer to the driver instance structure. * @param[in] channel One of the channels of the instance. * @param[in] val Absolute value to be set in the compare register. * @param[in] enable_irq True to enable the interrupt. False to disable the interrupt. * * @retval NRFX_SUCCESS The procedure is successful. * @retval NRFX_ERROR_TIMEOUT The compare is not set because the request value is behind the * current counter value. This error can only be reported * if the reliable mode is enabled. */ nrfx_err_t nrfx_rtc_cc_set(nrfx_rtc_t const * p_instance, uint32_t channel, uint32_t val, bool enable_irq); /** * @brief Function for disabling a channel. * * This function disables channel events and channel interrupts. * * @param[in] p_instance Pointer to the driver instance structure. * @param[in] channel One of the channels of the instance. * * @retval NRFX_SUCCESS The procedure is successful. * @retval NRFX_ERROR_TIMEOUT Interrupt is pending on the requested channel. */ nrfx_err_t nrfx_rtc_cc_disable(nrfx_rtc_t const * p_instance, uint32_t channel); /** * @brief Function for enabling the TICK event. * * This function enables the tick event and optionally the interrupt. * * @param[in] p_instance Pointer to the driver instance structure. * @param[in] enable_irq True to enable the interrupt. False to disable the interrupt. */ void nrfx_rtc_tick_enable(nrfx_rtc_t const * p_instance, bool enable_irq); /** * @brief Function for disabling the TICK event. * * This function disables the TICK event and interrupt. * * @param[in] p_instance Pointer to the driver instance structure. */ void nrfx_rtc_tick_disable(nrfx_rtc_t const * p_instance); /** * @brief Function for enabling overflow. * * This function enables the overflow event and optionally the interrupt. * * @param[in] p_instance Pointer to the driver instance structure. * @param[in] enable_irq True to enable the interrupt. False to disable the interrupt. */ void nrfx_rtc_overflow_enable(nrfx_rtc_t const * p_instance, bool enable_irq); /** * @brief Function for disabling overflow. * * This function disables the overflow event and interrupt. * * @param[in] p_instance Pointer to the driver instance structure. */ void nrfx_rtc_overflow_disable(nrfx_rtc_t const * p_instance); /** * @brief Function for getting the maximum relative tick value that can be set in the compare channel. * * When a stack (for example SoftDevice) is used and it occupies high priority interrupts, * the application code can be interrupted at any moment for a certain period of time. * If the reliable mode is enabled, the provided maximum latency is taken into account * and the return value is smaller than the RTC counter resolution. * If the reliable mode is disabled, the return value equals the counter resolution. * * @param[in] p_instance Pointer to the driver instance structure. * * @return Maximum ticks value. */ uint32_t nrfx_rtc_max_ticks_get(nrfx_rtc_t const * p_instance); /** * @brief Function for disabling all instance interrupts. * * @param[in] p_instance Pointer to the driver instance structure. * @param[in] p_mask Pointer to the location where the mask is filled. */ NRFX_STATIC_INLINE void nrfx_rtc_int_disable(nrfx_rtc_t const * p_instance, uint32_t * p_mask); /** * @brief Function for enabling instance interrupts. * * @param[in] p_instance Pointer to the driver instance structure. * @param[in] mask Mask of interrupts to enable. */ NRFX_STATIC_INLINE void nrfx_rtc_int_enable(nrfx_rtc_t const * p_instance, uint32_t mask); /** * @brief Function for retrieving the current counter value. * * @param[in] p_instance Pointer to the driver instance structure. * * @return Counter value. */ NRFX_STATIC_INLINE uint32_t nrfx_rtc_counter_get(nrfx_rtc_t const * p_instance); /** * @brief Function for clearing the counter value. * * @param[in] p_instance Pointer to the driver instance structure. */ NRFX_STATIC_INLINE void nrfx_rtc_counter_clear(nrfx_rtc_t const * p_instance); /** * @brief Function for returning a requested task address for the RTC driver instance. * * The task address can be used by the PPI module. * * @param[in] p_instance Pointer to the instance. * @param[in] task One of the peripheral tasks. * * @return Address of task register. */ NRFX_STATIC_INLINE uint32_t nrfx_rtc_task_address_get(nrfx_rtc_t const * p_instance, nrf_rtc_task_t task); /** * @brief Function for returning a requested event address for the RTC driver instance. * * The event address can be used by the PPI module. * * @param[in] p_instance Pointer to the driver instance structure. * @param[in] event One of the peripheral events. * * @return Address of event register. */ NRFX_STATIC_INLINE uint32_t nrfx_rtc_event_address_get(nrfx_rtc_t const * p_instance, nrf_rtc_event_t event); #ifndef NRFX_DECLARE_ONLY NRFX_STATIC_INLINE void nrfx_rtc_int_disable(nrfx_rtc_t const * p_instance, uint32_t * p_mask) { *p_mask = nrf_rtc_int_enable_check(p_instance->p_reg, ~0uL); nrf_rtc_int_disable(p_instance->p_reg, NRF_RTC_INT_TICK_MASK | NRF_RTC_INT_OVERFLOW_MASK | NRF_RTC_INT_COMPARE0_MASK | NRF_RTC_INT_COMPARE1_MASK | NRF_RTC_INT_COMPARE2_MASK | NRF_RTC_INT_COMPARE3_MASK); } NRFX_STATIC_INLINE void nrfx_rtc_int_enable(nrfx_rtc_t const * p_instance, uint32_t mask) { nrf_rtc_int_enable(p_instance->p_reg, mask); } NRFX_STATIC_INLINE uint32_t nrfx_rtc_counter_get(nrfx_rtc_t const * p_instance) { return nrf_rtc_counter_get(p_instance->p_reg); } NRFX_STATIC_INLINE void nrfx_rtc_counter_clear(nrfx_rtc_t const * p_instance) { nrf_rtc_task_trigger(p_instance->p_reg, NRF_RTC_TASK_CLEAR); } NRFX_STATIC_INLINE uint32_t nrfx_rtc_task_address_get(nrfx_rtc_t const * p_instance, nrf_rtc_task_t task) { return nrf_rtc_task_address_get(p_instance->p_reg, task); } NRFX_STATIC_INLINE uint32_t nrfx_rtc_event_address_get(nrfx_rtc_t const * p_instance, nrf_rtc_event_t event) { return nrf_rtc_event_address_get(p_instance->p_reg, event); } #endif // NRFX_DECLARE_ONLY /** @} */ void nrfx_rtc_0_irq_handler(void); void nrfx_rtc_1_irq_handler(void); void nrfx_rtc_2_irq_handler(void); #ifdef __cplusplus } #endif #endif // NRFX_RTC_H__