erkin yucel / mbed-os

mbed os with nrf51 internal bandgap enabled to read battery level

Dependents:   BLE_file_test BLE_Blink ExternalEncoder

targets/TARGET_NORDIC/TARGET_NRF5/rtc_api.c@0:f269e3021894, 2016-10-23 (annotated)

Committer:
elessair
Date:
Sun Oct 23 15:10:02 2016 +0000
Revision:
0:f269e3021894
Initial commit

Who changed what in which revision?

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elessair 0:f269e3021894 1 /*
elessair 0:f269e3021894 2 * Copyright (c) 2013 Nordic Semiconductor ASA
elessair 0:f269e3021894 3 * All rights reserved.
elessair 0:f269e3021894 4 *
elessair 0:f269e3021894 5 * Redistribution and use in source and binary forms, with or without modification,
elessair 0:f269e3021894 6 * are permitted provided that the following conditions are met:
elessair 0:f269e3021894 7 *
elessair 0:f269e3021894 8 * 1. Redistributions of source code must retain the above copyright notice, this list
elessair 0:f269e3021894 9 * of conditions and the following disclaimer.
elessair 0:f269e3021894 10 *
elessair 0:f269e3021894 11 * 2. Redistributions in binary form, except as embedded into a Nordic Semiconductor ASA
elessair 0:f269e3021894 12 * integrated circuit in a product or a software update for such product, must reproduce
elessair 0:f269e3021894 13 * the above copyright notice, this list of conditions and the following disclaimer in
elessair 0:f269e3021894 14 * the documentation and/or other materials provided with the distribution.
elessair 0:f269e3021894 15 *
elessair 0:f269e3021894 16 * 3. Neither the name of Nordic Semiconductor ASA nor the names of its contributors may be
elessair 0:f269e3021894 17 * used to endorse or promote products derived from this software without specific prior
elessair 0:f269e3021894 18 * written permission.
elessair 0:f269e3021894 19 *
elessair 0:f269e3021894 20 * 4. This software, with or without modification, must only be used with a
elessair 0:f269e3021894 21 * Nordic Semiconductor ASA integrated circuit.
elessair 0:f269e3021894 22 *
elessair 0:f269e3021894 23 * 5. Any software provided in binary or object form under this license must not be reverse
elessair 0:f269e3021894 24 * engineered, decompiled, modified and/or disassembled.
elessair 0:f269e3021894 25 *
elessair 0:f269e3021894 26 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
elessair 0:f269e3021894 27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
elessair 0:f269e3021894 28 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
elessair 0:f269e3021894 29 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
elessair 0:f269e3021894 30 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
elessair 0:f269e3021894 31 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
elessair 0:f269e3021894 32 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
elessair 0:f269e3021894 33 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
elessair 0:f269e3021894 34 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
elessair 0:f269e3021894 35 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
elessair 0:f269e3021894 36 *
elessair 0:f269e3021894 37 */
elessair 0:f269e3021894 38
elessair 0:f269e3021894 39 #include "rtc_api.h"
elessair 0:f269e3021894 40
elessair 0:f269e3021894 41 #if DEVICE_RTC
elessair 0:f269e3021894 42
elessair 0:f269e3021894 43 #include "common_rtc.h"
elessair 0:f269e3021894 44 #include "nrf_drv_clock.h"
elessair 0:f269e3021894 45 #include "app_util_platform.h"
elessair 0:f269e3021894 46
elessair 0:f269e3021894 47 static time_t m_time_base;
elessair 0:f269e3021894 48
elessair 0:f269e3021894 49 void rtc_init(void)
elessair 0:f269e3021894 50 {
elessair 0:f269e3021894 51 common_rtc_init();
elessair 0:f269e3021894 52 }
elessair 0:f269e3021894 53
elessair 0:f269e3021894 54 void rtc_free(void)
elessair 0:f269e3021894 55 {
elessair 0:f269e3021894 56 // A common counter is used for RTC, lp_ticker and us_ticker, so it can't be
elessair 0:f269e3021894 57 // disabled here, but this does not cause any extra cost. Besides, currently
elessair 0:f269e3021894 58 // this function is not used by RTC API in mbed-drivers.
elessair 0:f269e3021894 59 }
elessair 0:f269e3021894 60
elessair 0:f269e3021894 61 int rtc_isenabled(void)
elessair 0:f269e3021894 62 {
elessair 0:f269e3021894 63 return m_common_rtc_enabled;
elessair 0:f269e3021894 64 }
elessair 0:f269e3021894 65
elessair 0:f269e3021894 66 static uint32_t rtc_seconds_get(void)
elessair 0:f269e3021894 67 {
elessair 0:f269e3021894 68 // Convert current counter value to seconds.
elessair 0:f269e3021894 69 uint32_t seconds = nrf_rtc_counter_get(COMMON_RTC_INSTANCE) / RTC_INPUT_FREQ;
elessair 0:f269e3021894 70 // Add proper amount of seconds for each registered overflow of the counter.
elessair 0:f269e3021894 71 uint32_t seconds_per_overflow = (1uL << RTC_COUNTER_BITS) / RTC_INPUT_FREQ;
elessair 0:f269e3021894 72 return (seconds + (m_common_rtc_overflows * seconds_per_overflow));
elessair 0:f269e3021894 73 }
elessair 0:f269e3021894 74
elessair 0:f269e3021894 75 time_t rtc_read(void)
elessair 0:f269e3021894 76 {
elessair 0:f269e3021894 77 return m_time_base + rtc_seconds_get();
elessair 0:f269e3021894 78 }
elessair 0:f269e3021894 79
elessair 0:f269e3021894 80 void rtc_write(time_t t)
elessair 0:f269e3021894 81 {
elessair 0:f269e3021894 82 uint32_t seconds;
elessair 0:f269e3021894 83 do {
elessair 0:f269e3021894 84 seconds = rtc_seconds_get();
elessair 0:f269e3021894 85 m_time_base = t - seconds;
elessair 0:f269e3021894 86 // If the number of seconds indicated by the counter changed during the
elessair 0:f269e3021894 87 // update of the time base, just repeat the update, now using the new
elessair 0:f269e3021894 88 // number of seconds.
elessair 0:f269e3021894 89 } while (seconds != rtc_seconds_get());
elessair 0:f269e3021894 90 }
elessair 0:f269e3021894 91
elessair 0:f269e3021894 92 #endif // DEVICE_RTC