mbed official / mbed-dev

mbed library sources. Supersedes mbed-src.

Dependents:   Nucleo_Hello_Encoder BLE_iBeaconScan AM1805_DEMO DISCO-F429ZI_ExportTemplate1 ... more

targets/TARGET_NORDIC/TARGET_NRF5x/rtc_api.c@189:f392fc9709a3, 2019-02-20 (annotated)

Committer:
AnnaBridge
Date:
Wed Feb 20 22:31:08 2019 +0000
Revision:
189:f392fc9709a3
Parent:
186:707f6e361f3e 
mbed library release version 165

Who changed what in which revision?

UserRevisionLine numberNew contents of line
<> 144:ef7eb2e8f9f7 1 /*
<> 144:ef7eb2e8f9f7 2 * Copyright (c) 2013 Nordic Semiconductor ASA
<> 144:ef7eb2e8f9f7 3 * All rights reserved.
<> 144:ef7eb2e8f9f7 4 *
<> 144:ef7eb2e8f9f7 5 * Redistribution and use in source and binary forms, with or without modification,
<> 144:ef7eb2e8f9f7 6 * are permitted provided that the following conditions are met:
<> 144:ef7eb2e8f9f7 7 *
<> 144:ef7eb2e8f9f7 8 * 1. Redistributions of source code must retain the above copyright notice, this list
<> 144:ef7eb2e8f9f7 9 * of conditions and the following disclaimer.
<> 144:ef7eb2e8f9f7 10 *
<> 144:ef7eb2e8f9f7 11 * 2. Redistributions in binary form, except as embedded into a Nordic Semiconductor ASA
<> 144:ef7eb2e8f9f7 12 * integrated circuit in a product or a software update for such product, must reproduce
<> 144:ef7eb2e8f9f7 13 * the above copyright notice, this list of conditions and the following disclaimer in
<> 144:ef7eb2e8f9f7 14 * the documentation and/or other materials provided with the distribution.
<> 144:ef7eb2e8f9f7 15 *
<> 144:ef7eb2e8f9f7 16 * 3. Neither the name of Nordic Semiconductor ASA nor the names of its contributors may be
<> 144:ef7eb2e8f9f7 17 * used to endorse or promote products derived from this software without specific prior
<> 144:ef7eb2e8f9f7 18 * written permission.
<> 144:ef7eb2e8f9f7 19 *
<> 144:ef7eb2e8f9f7 20 * 4. This software, with or without modification, must only be used with a
<> 144:ef7eb2e8f9f7 21 * Nordic Semiconductor ASA integrated circuit.
<> 144:ef7eb2e8f9f7 22 *
<> 144:ef7eb2e8f9f7 23 * 5. Any software provided in binary or object form under this license must not be reverse
<> 144:ef7eb2e8f9f7 24 * engineered, decompiled, modified and/or disassembled.
<> 144:ef7eb2e8f9f7 25 *
<> 144:ef7eb2e8f9f7 26 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
<> 144:ef7eb2e8f9f7 27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
<> 144:ef7eb2e8f9f7 28 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
<> 144:ef7eb2e8f9f7 29 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
<> 144:ef7eb2e8f9f7 30 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
<> 144:ef7eb2e8f9f7 31 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
<> 144:ef7eb2e8f9f7 32 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
<> 144:ef7eb2e8f9f7 33 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
<> 144:ef7eb2e8f9f7 34 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
<> 144:ef7eb2e8f9f7 35 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
<> 144:ef7eb2e8f9f7 36 *
<> 144:ef7eb2e8f9f7 37 */
<> 144:ef7eb2e8f9f7 38
<> 144:ef7eb2e8f9f7 39 #include "rtc_api.h"
<> 144:ef7eb2e8f9f7 40
<> 144:ef7eb2e8f9f7 41 #if DEVICE_RTC
<> 144:ef7eb2e8f9f7 42
<> 144:ef7eb2e8f9f7 43 #include "common_rtc.h"
<> 144:ef7eb2e8f9f7 44 #include "nrf_drv_clock.h"
<> 144:ef7eb2e8f9f7 45 #include "app_util_platform.h"
<> 144:ef7eb2e8f9f7 46
<> 144:ef7eb2e8f9f7 47 static time_t m_time_base;
<> 144:ef7eb2e8f9f7 48
<> 144:ef7eb2e8f9f7 49 void rtc_init(void)
<> 144:ef7eb2e8f9f7 50 {
<> 144:ef7eb2e8f9f7 51 common_rtc_init();
<> 144:ef7eb2e8f9f7 52 }
<> 144:ef7eb2e8f9f7 53
<> 144:ef7eb2e8f9f7 54 void rtc_free(void)
<> 144:ef7eb2e8f9f7 55 {
<> 144:ef7eb2e8f9f7 56 // A common counter is used for RTC, lp_ticker and us_ticker, so it can't be
<> 144:ef7eb2e8f9f7 57 // disabled here, but this does not cause any extra cost. Besides, currently
<> 144:ef7eb2e8f9f7 58 // this function is not used by RTC API in mbed-drivers.
<> 144:ef7eb2e8f9f7 59 }
<> 144:ef7eb2e8f9f7 60
<> 144:ef7eb2e8f9f7 61 int rtc_isenabled(void)
<> 144:ef7eb2e8f9f7 62 {
<> 144:ef7eb2e8f9f7 63 return m_common_rtc_enabled;
<> 144:ef7eb2e8f9f7 64 }
<> 144:ef7eb2e8f9f7 65
<> 144:ef7eb2e8f9f7 66 static uint32_t rtc_seconds_get(void)
<> 144:ef7eb2e8f9f7 67 {
<> 144:ef7eb2e8f9f7 68 // Convert current counter value to seconds.
<> 144:ef7eb2e8f9f7 69 uint32_t seconds = nrf_rtc_counter_get(COMMON_RTC_INSTANCE) / RTC_INPUT_FREQ;
<> 144:ef7eb2e8f9f7 70 // Add proper amount of seconds for each registered overflow of the counter.
<> 144:ef7eb2e8f9f7 71 uint32_t seconds_per_overflow = (1uL << RTC_COUNTER_BITS) / RTC_INPUT_FREQ;
<> 144:ef7eb2e8f9f7 72 return (seconds + (m_common_rtc_overflows * seconds_per_overflow));
<> 144:ef7eb2e8f9f7 73 }
<> 144:ef7eb2e8f9f7 74
<> 144:ef7eb2e8f9f7 75 time_t rtc_read(void)
<> 144:ef7eb2e8f9f7 76 {
<> 144:ef7eb2e8f9f7 77 return m_time_base + rtc_seconds_get();
<> 144:ef7eb2e8f9f7 78 }
<> 144:ef7eb2e8f9f7 79
<> 144:ef7eb2e8f9f7 80 void rtc_write(time_t t)
<> 144:ef7eb2e8f9f7 81 {
<> 144:ef7eb2e8f9f7 82 uint32_t seconds;
<> 144:ef7eb2e8f9f7 83 do {
<> 144:ef7eb2e8f9f7 84 seconds = rtc_seconds_get();
<> 144:ef7eb2e8f9f7 85 m_time_base = t - seconds;
<> 144:ef7eb2e8f9f7 86 // If the number of seconds indicated by the counter changed during the
<> 144:ef7eb2e8f9f7 87 // update of the time base, just repeat the update, now using the new
<> 144:ef7eb2e8f9f7 88 // number of seconds.
<> 144:ef7eb2e8f9f7 89 } while (seconds != rtc_seconds_get());
<> 144:ef7eb2e8f9f7 90 }
<> 144:ef7eb2e8f9f7 91
<> 144:ef7eb2e8f9f7 92 #endif // DEVICE_RTC