/**
 * \file
 *
 * \brief Real-time Timer (RTT) driver for SAM.
 *
 * Copyright (c) 2011-2015 Atmel Corporation. All rights reserved.
 *
 * \asf_license_start
 *
 * \page License
 *
 * 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. The name of Atmel may not be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * 4. This software may only be redistributed and used in connection with an
 *    Atmel microcontroller product.
 *
 * THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
 * EXPRESSLY AND SPECIFICALLY DISCLAIMED. IN NO EVENT SHALL ATMEL 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.
 *
 * \asf_license_stop
 *
 */
/*
 * Support and FAQ: visit <a href="http://www.atmel.com/design-support/">Atmel Support</a>
 */

#include "rtt.h"

/// @cond 0
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#ifdef __cplusplus
extern "C" {
#endif
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    /**
     * \defgroup sam_drivers_rtt_group Real-time Timer (RTT)
     *
     * The Real-time Timer is built around a 32-bit counter used to count
     * roll-over events of the programmable 16-bit prescaler, which enables
     * counting elapsed seconds from a 32 kHz slow clock source.
     * This is a driver for configuration and use of the RTT peripheral.
     *
     * @{
     */

    /*
     * In follow series chip, the bit RTC1HZ and RTTDIS in RTT_MR are write only.
     * So we use a variable to record status of these bits.
     */
#if (SAM4N || SAM4S || SAM4E || SAM4C || SAMG51 || SAM4CP || SAM4CM || SAMV71 || SAMV70 || SAME70 || SAMS70)
    static uint32_t g_wobits_in_rtt_mr = 0;
#endif

    /**
     * \brief Initialize the given RTT.
     *
     * \note This function restarts the real-time timer. If w_prescaler is equal to zero,
     *  the prescaler period is equal to 2^16 * SCLK period. If not, the prescaler period
     *  is equal to us_prescaler * SCLK period.
     *
     * \param p_rtt Pointer to an RTT instance.
     * \param us_prescaler Prescaler value for the RTT.
     *
     * \return 0 if successful.
     */
    uint32_t rtt_init(Rtt *p_rtt, uint16_t us_prescaler)
{
#if (SAM4N || SAM4S || SAM4E || SAM4C || SAMG51 || SAM4CP || SAM4CM || SAMV71 || SAMV70 || SAME70 || SAMS70)
    p_rtt->RTT_MR = (us_prescaler | RTT_MR_RTTRST | g_wobits_in_rtt_mr);
#else
    p_rtt->RTT_MR = (us_prescaler | RTT_MR_RTTRST);
#endif
    return 0;
}

#if (SAM4N || SAM4S || SAM4E || SAM4C || SAMG51 || SAM4CP || SAM4CM || SAMV71 || SAMV70 || SAME70 || SAMS70)
/**
 * \brief Select RTT counter source.
 *
 * \param p_rtt Pointer to an RTT instance.
 * \param is_rtc_sel RTC 1Hz Clock Selection.
 */
void rtt_sel_source(Rtt *p_rtt, bool is_rtc_sel)
{
    if(is_rtc_sel) {
        g_wobits_in_rtt_mr |= RTT_MR_RTC1HZ;
        p_rtt->RTT_MR |= g_wobits_in_rtt_mr;
    } else {
        g_wobits_in_rtt_mr &= ~RTT_MR_RTC1HZ;
        p_rtt->RTT_MR |= g_wobits_in_rtt_mr;
    }
}

/**
 * \brief Enable RTT.
 *
 * \param p_rtt Pointer to an RTT instance.
 */
void rtt_enable(Rtt *p_rtt)
{
    g_wobits_in_rtt_mr &= ~RTT_MR_RTTDIS;
    p_rtt->RTT_MR |= g_wobits_in_rtt_mr;
}
/**
 * \brief Disable RTT.
 *
 * \param p_rtt Pointer to an RTT instance.
 */
void rtt_disable(Rtt *p_rtt)
{
    g_wobits_in_rtt_mr |= RTT_MR_RTTDIS;
    p_rtt->RTT_MR |= g_wobits_in_rtt_mr;
}
#elif (SAMG53 || SAMG54 || SAMG55)
void rtt_sel_source(Rtt *p_rtt, bool is_rtc_sel)
{
    if(is_rtc_sel) {
        p_rtt->RTT_MR |= RTT_MR_RTC1HZ;
    } else {
        p_rtt->RTT_MR &= ~RTT_MR_RTC1HZ;
    }
}

void rtt_enable(Rtt *p_rtt)
{
    p_rtt->RTT_MR &= ~RTT_MR_RTTDIS;
}
/**
 * \brief Disable RTT.
 *
 * \param p_rtt Pointer to an RTT instance.
 */
void rtt_disable(Rtt *p_rtt)
{
    p_rtt->RTT_MR |= RTT_MR_RTTDIS;
}
#endif

/**
 * \brief Enable RTT interrupts.
 *
 * \param p_rtt Pointer to an RTT instance.
 * \param ul_sources Interrupts to be enabled.
 */
void rtt_enable_interrupt(Rtt *p_rtt, uint32_t ul_sources)
{
    uint32_t temp;

    temp = p_rtt->RTT_MR;
    temp |= ul_sources;
#if (SAM4N || SAM4S || SAM4E || SAM4C || SAMG51 || SAM4CP || SAM4CM || SAMV71 || SAMV70 || SAME70 || SAMS70)
    temp |= g_wobits_in_rtt_mr;
#endif
    p_rtt->RTT_MR = temp;
}

/**
 * \brief Disable RTT interrupts.
 *
 * \param p_rtt Pointer to an RTT instance.
 * \param ul_sources Interrupts to be disabled.
 */
void rtt_disable_interrupt(Rtt *p_rtt, uint32_t ul_sources)
{
    uint32_t temp = 0;

    temp = p_rtt->RTT_MR;
    temp &= (~ul_sources);
#if (SAM4N || SAM4S || SAM4E || SAM4C || SAMG51 || SAM4CP || SAM4CM || SAMV71 || SAMV70 || SAME70 || SAMS70)
    temp |= g_wobits_in_rtt_mr;
#endif
    p_rtt->RTT_MR = temp;
}

/**
 * \brief Read the current value of the RTT timer value.
 *
 * \param p_rtt Pointer to an RTT instance.
 *
 * \return The current Real-time Timer value.
 */
uint32_t rtt_read_timer_value(Rtt *p_rtt)
{
    return p_rtt->RTT_VR;
}

/**
 * \brief Get the status register value of the given RTT.
 *
 * \param p_rtt Pointer to an RTT instance.
 *
 * \return The Real-time Timer status.
 */
uint32_t rtt_get_status(Rtt *p_rtt)
{
    return p_rtt->RTT_SR;
}

/**
 * \brief Configure the RTT to generate an alarm at the given time.
 *
 * \param p_rtt Pointer to an RTT instance.
 * \param ul_alarm_time Alarm time.
 *
 * \retval 0 Configuration is done.
 * \retval 1 Parameter error.
 */
uint32_t rtt_write_alarm_time(Rtt *p_rtt, uint32_t ul_alarm_time)
{
    uint32_t flag;

    if (ul_alarm_time == 0) {
        return 1;
    }

    flag = p_rtt->RTT_MR & RTT_MR_ALMIEN;

    rtt_disable_interrupt(RTT, RTT_MR_ALMIEN);

    /* Alarm time = ALMV + 1 */
    p_rtt->RTT_AR = ul_alarm_time - 1;

    if (flag) {
        rtt_enable_interrupt(RTT, RTT_MR_ALMIEN);
    }

    return 0;
}

//@}

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