File content as of revision 181:57724642e740:

/* mbed Microcontroller Library
 * Copyright (c) 2006-2013 ARM Limited
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
#include "rtc_api.h"

#if DEVICE_RTC

#include "pinmap.h"
#include "fsl_rtc.h"
#include "PeripheralPins.h"

extern void rtc_setup_oscillator(void);

void rtc_init(void)
{
    rtc_setup_oscillator();

    RTC_Init(RTC);

    RTC_StartTimer(RTC);
}

void rtc_free(void)
{
    RTC_Deinit(RTC);
}

/*
 * Little check routine to see if the RTC has been enabled
 * 0 = Disabled, 1 = Enabled
 */
int rtc_isenabled(void)
{
    CLOCK_EnableClock(kCLOCK_Rtc);
    return (int)((RTC->CTRL & RTC_CTRL_RTC_EN_MASK) >> RTC_CTRL_RTC_EN_SHIFT);
}

time_t rtc_read(void)
{
    return (time_t)RTC->COUNT;
}

void rtc_write(time_t t)
{
    RTC_StopTimer(RTC);
    RTC->COUNT = t;
    RTC_StartTimer(RTC);
}

#endif