nrf_rtc.h

/**
 * Copyright (c) 2014 - 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
 * @brief RTC HAL API.
 */

#ifndef NRF_RTC_H
#define NRF_RTC_H

/**
 * @defgroup nrf_rtc_hal RTC HAL
 * @{
 * @ingroup nrf_rtc
 * @brief Hardware access layer for managing the real time counter (RTC).
 */

#include <stdint.h>
#include <stddef.h>
#include <stdbool.h>
#include "nrf.h"
#include "nrf_assert.h"
#include "nrf_peripherals.h"

#ifdef __cplusplus
extern "C" {
#endif

/**
 * @brief Macro for getting the number of compare channels available
 *        in a given RTC instance.
 */

#define NRF_RTC_CC_CHANNEL_COUNT(id) CONCAT_3(RTC, id, _CC_NUM)

#define RTC_INPUT_FREQ 32768 /**< Input frequency of the RTC instance. */

/**
 * @brief Macro for converting expected frequency to prescaler setting.
 */
#define RTC_FREQ_TO_PRESCALER(FREQ) (uint16_t)((RTC_INPUT_FREQ / (FREQ)) - 1)

/**< Macro for wrapping values to RTC capacity. */
#define RTC_WRAP(val) (val & RTC_COUNTER_COUNTER_Msk)

#define RTC_CHANNEL_INT_MASK(ch)    ((uint32_t)NRF_RTC_INT_COMPARE0_MASK << ch)
#define RTC_CHANNEL_EVENT_ADDR(ch)  (nrf_rtc_event_t)(NRF_RTC_EVENT_COMPARE_0 + ch * sizeof(uint32_t))
/**
 * @enum nrf_rtc_task_t
 * @brief RTC tasks.
 */
typedef enum
{
    /*lint -save -e30*/
    NRF_RTC_TASK_START            = offsetof(NRF_RTC_Type,TASKS_START),     /**< Start. */
    NRF_RTC_TASK_STOP             = offsetof(NRF_RTC_Type,TASKS_STOP),      /**< Stop. */
    NRF_RTC_TASK_CLEAR            = offsetof(NRF_RTC_Type,TASKS_CLEAR),     /**< Clear. */
    NRF_RTC_TASK_TRIGGER_OVERFLOW = offsetof(NRF_RTC_Type,TASKS_TRIGOVRFLW),/**< Trigger overflow. */
    /*lint -restore*/
} nrf_rtc_task_t;

/**
 * @enum nrf_rtc_event_t
 * @brief RTC events.
 */
typedef enum
{
    /*lint -save -e30*/
    NRF_RTC_EVENT_TICK        = offsetof(NRF_RTC_Type,EVENTS_TICK),       /**< Tick event. */
    NRF_RTC_EVENT_OVERFLOW    = offsetof(NRF_RTC_Type,EVENTS_OVRFLW),     /**< Overflow event. */
    NRF_RTC_EVENT_COMPARE_0   = offsetof(NRF_RTC_Type,EVENTS_COMPARE[0]), /**< Compare 0 event. */
    NRF_RTC_EVENT_COMPARE_1   = offsetof(NRF_RTC_Type,EVENTS_COMPARE[1]), /**< Compare 1 event. */
    NRF_RTC_EVENT_COMPARE_2   = offsetof(NRF_RTC_Type,EVENTS_COMPARE[2]), /**< Compare 2 event. */
    NRF_RTC_EVENT_COMPARE_3   = offsetof(NRF_RTC_Type,EVENTS_COMPARE[3])  /**< Compare 3 event. */
    /*lint -restore*/
} nrf_rtc_event_t;

/**
 * @enum nrf_rtc_int_t
 * @brief RTC interrupts.
 */
typedef enum
{
    NRF_RTC_INT_TICK_MASK     = RTC_INTENSET_TICK_Msk,     /**< RTC interrupt from tick event. */
    NRF_RTC_INT_OVERFLOW_MASK = RTC_INTENSET_OVRFLW_Msk,   /**< RTC interrupt from overflow event. */
    NRF_RTC_INT_COMPARE0_MASK = RTC_INTENSET_COMPARE0_Msk, /**< RTC interrupt from compare event on channel 0. */
    NRF_RTC_INT_COMPARE1_MASK = RTC_INTENSET_COMPARE1_Msk, /**< RTC interrupt from compare event on channel 1. */
    NRF_RTC_INT_COMPARE2_MASK = RTC_INTENSET_COMPARE2_Msk, /**< RTC interrupt from compare event on channel 2. */
    NRF_RTC_INT_COMPARE3_MASK = RTC_INTENSET_COMPARE3_Msk  /**< RTC interrupt from compare event on channel 3. */
} nrf_rtc_int_t;

/**@brief Function for setting a compare value for a channel.
 *
 * @param[in]  p_rtc         Pointer to the peripheral registers structure.
 * @param[in]  ch            Channel.
 * @param[in]  cc_val        Compare value to set.
 */
__STATIC_INLINE  void nrf_rtc_cc_set(NRF_RTC_Type * p_rtc, uint32_t ch, uint32_t cc_val);

/**@brief Function for returning the compare value for a channel.
 *
 * @param[in]  p_rtc         Pointer to the peripheral registers structure.
 * @param[in]  ch            Channel.
 *
 * @return                   COMPARE[ch] value.
 */
__STATIC_INLINE  uint32_t nrf_rtc_cc_get(NRF_RTC_Type * p_rtc, uint32_t ch);

/**@brief Function for enabling interrupts.
 *
 * @param[in]  p_rtc         Pointer to the peripheral registers structure.
 * @param[in]  mask          Interrupt mask to be enabled.
 */
__STATIC_INLINE void nrf_rtc_int_enable(NRF_RTC_Type * p_rtc, uint32_t mask);

/**@brief Function for disabling interrupts.
 *
 * @param[in]  p_rtc         Pointer to the peripheral registers structure.
 * @param[in]  mask          Interrupt mask to be disabled.
 */
__STATIC_INLINE void nrf_rtc_int_disable(NRF_RTC_Type * p_rtc, uint32_t mask);

/**@brief Function for checking if interrupts are enabled.
 *
 * @param[in]  p_rtc         Pointer to the peripheral registers structure.
 * @param[in]  mask          Mask of interrupt flags to check.
 *
 * @return                   Mask with enabled interrupts.
 */
__STATIC_INLINE uint32_t nrf_rtc_int_is_enabled(NRF_RTC_Type * p_rtc, uint32_t mask);

/**@brief Function for returning the status of currently enabled interrupts.
 *
 * @param[in]  p_rtc         Pointer to the peripheral registers structure.
 *
 * @return                   Value in INTEN register.
 */
__STATIC_INLINE uint32_t nrf_rtc_int_get(NRF_RTC_Type * p_rtc);

/**@brief Function for checking if an event is pending.
 *
 * @param[in]  p_rtc         Pointer to the peripheral registers structure.
 * @param[in]  event         Address of the event.
 *
 * @return                   Mask of pending events.
 */
__STATIC_INLINE uint32_t nrf_rtc_event_pending(NRF_RTC_Type * p_rtc, nrf_rtc_event_t event);

/**@brief Function for clearing an event.
 *
 * @param[in]  p_rtc         Pointer to the peripheral registers structure.
 * @param[in]  event         Event to clear.
 */
__STATIC_INLINE void nrf_rtc_event_clear(NRF_RTC_Type * p_rtc, nrf_rtc_event_t event);

/**@brief Function for returning a counter value.
 *
 * @param[in]  p_rtc         Pointer to the peripheral registers structure.
 *
 * @return                   Counter value.
 */
__STATIC_INLINE uint32_t nrf_rtc_counter_get(NRF_RTC_Type * p_rtc);

/**@brief Function for setting a prescaler value.
 *
 * @param[in]  p_rtc         Pointer to the peripheral registers structure.
 * @param[in]  val           Value to set the prescaler to.
 */
__STATIC_INLINE void nrf_rtc_prescaler_set(NRF_RTC_Type * p_rtc, uint32_t val);

/**@brief Function for returning the address of an event.
 *
 * @param[in]  p_rtc         Pointer to the peripheral registers structure.
 * @param[in]  event         Requested event.
 *
 * @return     Address of the requested event register.
 */
__STATIC_INLINE uint32_t nrf_rtc_event_address_get(NRF_RTC_Type * p_rtc, nrf_rtc_event_t event);

/**@brief Function for returning the address of a task.
 *
 * @param[in]  p_rtc         Pointer to the peripheral registers structure.
 * @param[in]  task          Requested task.
 *
 * @return     Address of the requested task register.
 */
__STATIC_INLINE uint32_t nrf_rtc_task_address_get(NRF_RTC_Type * p_rtc, nrf_rtc_task_t task);

/**@brief Function for starting a task.
 *
 * @param[in]  p_rtc         Pointer to the peripheral registers structure.
 * @param[in]  task          Requested task.
 */
__STATIC_INLINE void nrf_rtc_task_trigger(NRF_RTC_Type * p_rtc, nrf_rtc_task_t task);

/**@brief Function for enabling events.
 *
 * @param[in]  p_rtc         Pointer to the peripheral registers structure.
 * @param[in]  mask          Mask of event flags to enable.
 */
__STATIC_INLINE void nrf_rtc_event_enable(NRF_RTC_Type * p_rtc, uint32_t mask);

/**@brief Function for disabling an event.
 *
 * @param[in]  p_rtc         Pointer to the peripheral registers structure.
 * @param[in]  event         Requested event.
 */
__STATIC_INLINE void nrf_rtc_event_disable(NRF_RTC_Type * p_rtc, uint32_t event);

/**
 *@}
 **/


#ifndef SUPPRESS_INLINE_IMPLEMENTATION

__STATIC_INLINE  void nrf_rtc_cc_set(NRF_RTC_Type * p_rtc, uint32_t ch, uint32_t cc_val)
{
    p_rtc->CC[ch] = cc_val;
}

__STATIC_INLINE  uint32_t nrf_rtc_cc_get(NRF_RTC_Type * p_rtc, uint32_t ch)
{
    return p_rtc->CC[ch];
}

__STATIC_INLINE void nrf_rtc_int_enable(NRF_RTC_Type * p_rtc, uint32_t mask)
{
    p_rtc->INTENSET = mask;
}

__STATIC_INLINE void nrf_rtc_int_disable(NRF_RTC_Type * p_rtc, uint32_t mask)
{
    p_rtc->INTENCLR = mask;
}

__STATIC_INLINE uint32_t nrf_rtc_int_is_enabled(NRF_RTC_Type * p_rtc, uint32_t mask)
{
    return (p_rtc->INTENSET & mask);
}

__STATIC_INLINE uint32_t nrf_rtc_int_get(NRF_RTC_Type * p_rtc)
{
    return p_rtc->INTENSET;
}

__STATIC_INLINE uint32_t nrf_rtc_event_pending(NRF_RTC_Type * p_rtc, nrf_rtc_event_t event)
{
    return *(volatile uint32_t *)((uint8_t *)p_rtc + (uint32_t)event);
}

__STATIC_INLINE void nrf_rtc_event_clear(NRF_RTC_Type * p_rtc, nrf_rtc_event_t event)
{
    *((volatile uint32_t *)((uint8_t *)p_rtc + (uint32_t)event)) = 0;
#if __CORTEX_M == 0x04
    volatile uint32_t dummy = *((volatile uint32_t *)((uint8_t *)p_rtc + (uint32_t)event));
    (void)dummy;
#endif
}

__STATIC_INLINE uint32_t nrf_rtc_counter_get(NRF_RTC_Type * p_rtc)
{
     return p_rtc->COUNTER;
}

__STATIC_INLINE void nrf_rtc_prescaler_set(NRF_RTC_Type * p_rtc, uint32_t val)
{
    ASSERT(val <= (RTC_PRESCALER_PRESCALER_Msk >> RTC_PRESCALER_PRESCALER_Pos));
    p_rtc->PRESCALER = val;
}
__STATIC_INLINE uint32_t rtc_prescaler_get(NRF_RTC_Type * p_rtc)
{
    return p_rtc->PRESCALER;
}

__STATIC_INLINE uint32_t nrf_rtc_event_address_get(NRF_RTC_Type * p_rtc, nrf_rtc_event_t event)
{
    return (uint32_t)p_rtc + event;
}

__STATIC_INLINE uint32_t nrf_rtc_task_address_get(NRF_RTC_Type * p_rtc, nrf_rtc_task_t task)
{
    return (uint32_t)p_rtc + task;
}

__STATIC_INLINE void nrf_rtc_task_trigger(NRF_RTC_Type * p_rtc, nrf_rtc_task_t task)
{
    *(__IO uint32_t *)((uint32_t)p_rtc + task) = 1;
}

__STATIC_INLINE void nrf_rtc_event_enable(NRF_RTC_Type * p_rtc, uint32_t mask)
{
    p_rtc->EVTENSET = mask;
}
__STATIC_INLINE void nrf_rtc_event_disable(NRF_RTC_Type * p_rtc, uint32_t mask)
{
    p_rtc->EVTENCLR = mask;
}
#endif


#ifdef __cplusplus
}
#endif

#endif  /* NRF_RTC_H */