mirror of https://github.com/ARMmbed/mbed-os.git
93 lines
3.3 KiB
C
93 lines
3.3 KiB
C
/*
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* Copyright (c) 2013 Nordic Semiconductor ASA
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without modification,
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* are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this list
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* of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form, except as embedded into a Nordic Semiconductor ASA
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* integrated circuit in a product or a software update for such product, must reproduce
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* the above copyright notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the distribution.
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*
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* 3. Neither the name of Nordic Semiconductor ASA nor the names of its contributors may be
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* used to endorse or promote products derived from this software without specific prior
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* written permission.
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*
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* 4. This software, with or without modification, must only be used with a
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* Nordic Semiconductor ASA integrated circuit.
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*
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* 5. Any software provided in binary or object form under this license must not be reverse
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* engineered, decompiled, modified and/or disassembled.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
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* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
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* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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*/
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#include "rtc_api.h"
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#if DEVICE_RTC
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#include "common_rtc.h"
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#include "nrf_rtc.h"
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#include "app_util_platform.h"
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static time_t m_time_base;
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void rtc_init(void)
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{
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common_rtc_init();
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}
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void rtc_free(void)
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{
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// A common counter is used for RTC, lp_ticker and us_ticker, so it can't be
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// disabled here, but this does not cause any extra cost. Besides, currently
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// this function is not used by RTC API in mbed-drivers.
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}
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int rtc_isenabled(void)
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{
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return m_common_rtc_enabled;
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}
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static uint32_t rtc_seconds_get(void)
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{
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// Convert current counter value to seconds.
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uint32_t seconds = nrf_rtc_counter_get(COMMON_RTC_INSTANCE) / RTC_INPUT_FREQ;
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// Add proper amount of seconds for each registered overflow of the counter.
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uint32_t seconds_per_overflow = (1uL << RTC_COUNTER_BITS) / RTC_INPUT_FREQ;
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return (seconds + (m_common_rtc_overflows * seconds_per_overflow));
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}
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time_t rtc_read(void)
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{
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return m_time_base + rtc_seconds_get();
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}
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void rtc_write(time_t t)
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{
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uint32_t seconds;
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do {
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seconds = rtc_seconds_get();
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m_time_base = t - seconds;
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// If the number of seconds indicated by the counter changed during the
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// update of the time base, just repeat the update, now using the new
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// number of seconds.
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} while (seconds != rtc_seconds_get());
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}
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#endif // DEVICE_RTC
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