File content as of revision 172:65be27845400:

/*
 * Copyright (c) 2015, Freescale Semiconductor, Inc.
 * Copyright 2016-2017 NXP
 *
 * Redistribution and use in source and binary forms, with or without modification,
 * are permitted provided that the following conditions are met:
 *
 * o Redistributions of source code must retain the above copyright notice, this list
 *   of conditions and the following disclaimer.
 *
 * o 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.
 *
 * o 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 _FSL_RTC_H_
#define _FSL_RTC_H_

#include "fsl_common.h"

/*!
 * @addtogroup rtc
 * @{
 */


/*******************************************************************************
 * Definitions
 ******************************************************************************/

/*! @name Driver version */
/*@{*/
#define FSL_RTC_DRIVER_VERSION (MAKE_VERSION(2, 0, 0)) /*!< Version 2.0.0 */
/*@}*/

/*! @brief List of RTC interrupts */
typedef enum _rtc_interrupt_enable
{
    kRTC_TimeInvalidInterruptEnable = RTC_IER_TIIE_MASK,  /*!< Time invalid interrupt.*/
    kRTC_TimeOverflowInterruptEnable = RTC_IER_TOIE_MASK, /*!< Time overflow interrupt.*/
    kRTC_AlarmInterruptEnable = RTC_IER_TAIE_MASK,        /*!< Alarm interrupt.*/
    kRTC_SecondsInterruptEnable = RTC_IER_TSIE_MASK       /*!< Seconds interrupt.*/
} rtc_interrupt_enable_t;

/*! @brief List of RTC flags */
typedef enum _rtc_status_flags
{
    kRTC_TimeInvalidFlag = RTC_SR_TIF_MASK,  /*!< Time invalid flag */
    kRTC_TimeOverflowFlag = RTC_SR_TOF_MASK, /*!< Time overflow flag */
    kRTC_AlarmFlag = RTC_SR_TAF_MASK         /*!< Alarm flag*/
} rtc_status_flags_t;

#if (defined(FSL_FEATURE_RTC_HAS_OSC_SCXP) && FSL_FEATURE_RTC_HAS_OSC_SCXP)

/*! @brief List of RTC Oscillator capacitor load settings */
typedef enum _rtc_osc_cap_load
{
    kRTC_Capacitor_2p = RTC_CR_SC2P_MASK,  /*!< 2 pF capacitor load */
    kRTC_Capacitor_4p = RTC_CR_SC4P_MASK,  /*!< 4 pF capacitor load */
    kRTC_Capacitor_8p = RTC_CR_SC8P_MASK,  /*!< 8 pF capacitor load */
    kRTC_Capacitor_16p = RTC_CR_SC16P_MASK /*!< 16 pF capacitor load */
} rtc_osc_cap_load_t;

#endif /* FSL_FEATURE_SCG_HAS_OSC_SCXP */

/*! @brief Structure is used to hold the date and time */
typedef struct _rtc_datetime
{
    uint16_t year;  /*!< Range from 1970 to 2099.*/
    uint8_t month;  /*!< Range from 1 to 12.*/
    uint8_t day;    /*!< Range from 1 to 31 (depending on month).*/
    uint8_t hour;   /*!< Range from 0 to 23.*/
    uint8_t minute; /*!< Range from 0 to 59.*/
    uint8_t second; /*!< Range from 0 to 59.*/
} rtc_datetime_t;

/*!
 * @brief RTC config structure
 *
 * This structure holds the configuration settings for the RTC peripheral. To initialize this
 * structure to reasonable defaults, call the RTC_GetDefaultConfig() function and pass a
 * pointer to your config structure instance.
 *
 * The config struct can be made const so it resides in flash
 */
typedef struct _rtc_config
{
    bool wakeupSelect;             /*!< true: Wakeup pin outputs the 32 KHz clock;
                                        false:Wakeup pin used to wakeup the chip  */
    bool updateMode;               /*!< true: Registers can be written even when locked under certain
                                        conditions, false: No writes allowed when registers are locked */
    bool supervisorAccess;         /*!< true: Non-supervisor accesses are allowed;
                                        false: Non-supervisor accesses are not supported */
    uint32_t compensationInterval; /*!< Compensation interval that is written to the CIR field in RTC TCR Register */
    uint32_t compensationTime;     /*!< Compensation time that is written to the TCR field in RTC TCR Register */
} rtc_config_t;

/*******************************************************************************
 * API
 ******************************************************************************/

#if defined(__cplusplus)
extern "C" {
#endif

/*!
 * @name Initialization and deinitialization
 * @{
 */

/*!
 * @brief Ungates the RTC clock and configures the peripheral for basic operation.
 *
 * This function issues a software reset if the timer invalid flag is set.
 *
 * @note This API should be called at the beginning of the application using the RTC driver.
 *
 * @param base   RTC peripheral base address
 * @param config Pointer to the user's RTC configuration structure.
 */
void RTC_Init(RTC_Type *base, const rtc_config_t *config);

/*!
 * @brief Stops the timer and gate the RTC clock.
 *
 * @param base RTC peripheral base address
 */
static inline void RTC_Deinit(RTC_Type *base)
{
    /* Stop the RTC timer */
    base->SR &= ~RTC_SR_TCE_MASK;

#if !(defined(FSL_SDK_DISABLE_DRIVER_CLOCK_CONTROL) && FSL_SDK_DISABLE_DRIVER_CLOCK_CONTROL)
    /* Gate the module clock */
    CLOCK_DisableClock(kCLOCK_Rtc0);
#endif /* FSL_SDK_DISABLE_DRIVER_CLOCK_CONTROL */
}

/*!
 * @brief Fills in the RTC config struct with the default settings.
 *
 * The default values are as follows.
 * @code
 *    config->wakeupSelect = false;
 *    config->updateMode = false;
 *    config->supervisorAccess = false;
 *    config->compensationInterval = 0;
 *    config->compensationTime = 0;
 * @endcode
 * @param config Pointer to the user's RTC configuration structure.
 */
void RTC_GetDefaultConfig(rtc_config_t *config);

/*! @}*/

/*!
 * @name Current Time & Alarm
 * @{
 */

/*!
 * @brief Sets the RTC date and time according to the given time structure.
 *
 * The RTC counter must be stopped prior to calling this function because writes to the RTC
 * seconds register fail if the RTC counter is running.
 *
 * @param base     RTC peripheral base address
 * @param datetime Pointer to the structure where the date and time details are stored.
 *
 * @return kStatus_Success: Success in setting the time and starting the RTC
 *         kStatus_InvalidArgument: Error because the datetime format is incorrect
 */
status_t RTC_SetDatetime(RTC_Type *base, const rtc_datetime_t *datetime);

/*!
 * @brief Gets the RTC time and stores it in the given time structure.
 *
 * @param base     RTC peripheral base address
 * @param datetime Pointer to the structure where the date and time details are stored.
 */
void RTC_GetDatetime(RTC_Type *base, rtc_datetime_t *datetime);

/*!
 * @brief Sets the RTC alarm time.
 *
 * The function checks whether the specified alarm time is greater than the present
 * time. If not, the function does not set the alarm and returns an error.
 *
 * @param base      RTC peripheral base address
 * @param alarmTime Pointer to the structure where the alarm time is stored.
 *
 * @return kStatus_Success: success in setting the RTC alarm
 *         kStatus_InvalidArgument: Error because the alarm datetime format is incorrect
 *         kStatus_Fail: Error because the alarm time has already passed
 */
status_t RTC_SetAlarm(RTC_Type *base, const rtc_datetime_t *alarmTime);

/*!
 * @brief Returns the RTC alarm time.
 *
 * @param base     RTC peripheral base address
 * @param datetime Pointer to the structure where the alarm date and time details are stored.
 */
void RTC_GetAlarm(RTC_Type *base, rtc_datetime_t *datetime);

/*! @}*/

/*!
 * @name Interrupt Interface
 * @{
 */

/*!
 * @brief Enables the selected RTC interrupts.
 *
 * @param base RTC peripheral base address
 * @param mask The interrupts to enable. This is a logical OR of members of the
 *             enumeration ::rtc_interrupt_enable_t
 */
static inline void RTC_EnableInterrupts(RTC_Type *base, uint32_t mask)
{
    base->IER |= mask;
}

/*!
 * @brief Disables the selected RTC interrupts.
 *
 * @param base RTC peripheral base address
 * @param mask The interrupts to enable. This is a logical OR of members of the
 *             enumeration ::rtc_interrupt_enable_t
 */
static inline void RTC_DisableInterrupts(RTC_Type *base, uint32_t mask)
{
    base->IER &= ~mask;
}

/*!
 * @brief Gets the enabled RTC interrupts.
 *
 * @param base RTC peripheral base address
 *
 * @return The enabled interrupts. This is the logical OR of members of the
 *         enumeration ::rtc_interrupt_enable_t
 */
static inline uint32_t RTC_GetEnabledInterrupts(RTC_Type *base)
{
    return (base->IER & (RTC_IER_TIIE_MASK | RTC_IER_TOIE_MASK | RTC_IER_TAIE_MASK | RTC_IER_TSIE_MASK));
}

/*! @}*/

/*!
 * @name Status Interface
 * @{
 */

/*!
 * @brief Gets the RTC status flags.
 *
 * @param base RTC peripheral base address
 *
 * @return The status flags. This is the logical OR of members of the
 *         enumeration ::rtc_status_flags_t
 */
static inline uint32_t RTC_GetStatusFlags(RTC_Type *base)
{
    return (base->SR & (RTC_SR_TIF_MASK | RTC_SR_TOF_MASK | RTC_SR_TAF_MASK));
}

/*!
 * @brief  Clears the RTC status flags.
 *
 * @param base RTC peripheral base address
 * @param mask The status flags to clear. This is a logical OR of members of the
 *             enumeration ::rtc_status_flags_t
 */
void RTC_ClearStatusFlags(RTC_Type *base, uint32_t mask);

/*! @}*/

/*!
 * @name Timer Start and Stop
 * @{
 */

/*!
 * @brief Starts the RTC time counter.
 *
 * After calling this function, the timer counter increments once a second provided SR[TOF] or
 * SR[TIF] are not set.
 *
 * @param base RTC peripheral base address
 */
static inline void RTC_StartTimer(RTC_Type *base)
{
    base->SR |= RTC_SR_TCE_MASK;
}

/*!
 * @brief Stops the RTC time counter.
 *
 * RTC's seconds register can be written to only when the timer is stopped.
 *
 * @param base RTC peripheral base address
 */
static inline void RTC_StopTimer(RTC_Type *base)
{
    base->SR &= ~RTC_SR_TCE_MASK;
}

/*! @}*/

#if (defined(FSL_FEATURE_RTC_HAS_OSC_SCXP) && FSL_FEATURE_RTC_HAS_OSC_SCXP)

/*!
 * @brief This function sets the specified capacitor configuration for the RTC oscillator.
 *
 * @param base    RTC peripheral base address
 * @param capLoad Oscillator loads to enable. This is a logical OR of members of the
 *                enumeration ::rtc_osc_cap_load_t
 */
static inline void RTC_SetOscCapLoad(RTC_Type *base, uint32_t capLoad)
{
    uint32_t reg = base->CR;

    reg &= ~(RTC_CR_SC2P_MASK | RTC_CR_SC4P_MASK | RTC_CR_SC8P_MASK | RTC_CR_SC16P_MASK);
    reg |= capLoad;

    base->CR = reg;
}

#endif /* FSL_FEATURE_SCG_HAS_OSC_SCXP */

/*!
 * @brief Performs a software reset on the RTC module.
 *
 * This resets all RTC registers except for the SWR bit and the RTC_WAR and RTC_RAR
 * registers. The SWR bit is cleared by software explicitly clearing it.
 *
 * @param base RTC peripheral base address
 */
static inline void RTC_Reset(RTC_Type *base)
{
    base->CR |= RTC_CR_SWR_MASK;
    base->CR &= ~RTC_CR_SWR_MASK;

    /* Set TSR register to 0x1 to avoid the timer invalid (TIF) bit being set in the SR register */
    base->TSR = 1U;
}

#if defined(FSL_FEATURE_RTC_HAS_MONOTONIC) && (FSL_FEATURE_RTC_HAS_MONOTONIC)

/*!
 * @name Monotonic counter functions
 * @{
 */

/*!
 * @brief Reads the values of the Monotonic Counter High and Monotonic Counter Low and returns
 *        them as a single value.
 *
 * @param base    RTC peripheral base address
 * @param counter Pointer to variable where the value is stored.
 */
void RTC_GetMonotonicCounter(RTC_Type *base, uint64_t *counter);

/*!
 * @brief Writes values Monotonic Counter High and Monotonic Counter Low by decomposing
 *        the given single value.
 *
 * @param base    RTC peripheral base address
 * @param counter Counter value
 */
void RTC_SetMonotonicCounter(RTC_Type *base, uint64_t counter);

/*!
 * @brief Increments the Monotonic Counter by one.
 *
 * Increments the Monotonic Counter (registers RTC_MCLR and RTC_MCHR accordingly) by setting
 * the monotonic counter enable (MER[MCE]) and then writing to the RTC_MCLR register. A write to the
 * monotonic counter low that causes it to overflow also increments the monotonic counter high.
 *
 * @param base RTC peripheral base address
 *
 * @return kStatus_Success: success
 *         kStatus_Fail: error occurred, either time invalid or monotonic overflow flag was found
 */
status_t RTC_IncrementMonotonicCounter(RTC_Type *base);

/*! @}*/

#endif /* FSL_FEATURE_RTC_HAS_MONOTONIC */

#if defined(__cplusplus)
}
#endif

/*! @}*/

#endif /* _FSL_RTC_H_ */