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_MCU_NRF51822/TARGET_DELTA_DFCM_NNN40/rtc_api.c@189:f392fc9709a3, 2019-02-20 (annotated)

Committer:
AnnaBridge
Date:
Wed Feb 20 22:31:08 2019 +0000
Revision:
189:f392fc9709a3
Parent:
149:156823d33999 
mbed library release version 165

Who changed what in which revision?

UserRevisionLine numberNew contents of line
<> 144:ef7eb2e8f9f7 1 /* mbed Microcontroller Library
<> 144:ef7eb2e8f9f7 2 * Copyright (c) 2006-2013 ARM Limited
<> 144:ef7eb2e8f9f7 3 *
<> 144:ef7eb2e8f9f7 4 * Licensed under the Apache License, Version 2.0 (the "License");
<> 144:ef7eb2e8f9f7 5 * you may not use this file except in compliance with the License.
<> 144:ef7eb2e8f9f7 6 * You may obtain a copy of the License at
<> 144:ef7eb2e8f9f7 7 *
<> 144:ef7eb2e8f9f7 8 * http://www.apache.org/licenses/LICENSE-2.0
<> 144:ef7eb2e8f9f7 9 *
<> 144:ef7eb2e8f9f7 10 * Unless required by applicable law or agreed to in writing, software
<> 144:ef7eb2e8f9f7 11 * distributed under the License is distributed on an "AS IS" BASIS,
<> 144:ef7eb2e8f9f7 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
<> 144:ef7eb2e8f9f7 13 * See the License for the specific language governing permissions and
<> 144:ef7eb2e8f9f7 14 * limitations under the License.
<> 144:ef7eb2e8f9f7 15 */
<> 144:ef7eb2e8f9f7 16 #include "rtc_api.h"
<> 144:ef7eb2e8f9f7 17
<> 144:ef7eb2e8f9f7 18
<> 144:ef7eb2e8f9f7 19 #define LFCLK_FREQUENCY (32768UL)
<> 144:ef7eb2e8f9f7 20 #define RTC0_COUNTER_PRESCALER ((LFCLK_FREQUENCY/8) - 1)
<> 144:ef7eb2e8f9f7 21 #define COMPARE_COUNTERTIME (691200UL) //86400 x 8
<> 144:ef7eb2e8f9f7 22
<> 144:ef7eb2e8f9f7 23
<> 144:ef7eb2e8f9f7 24 time_t initTime;
<> 144:ef7eb2e8f9f7 25
<> 144:ef7eb2e8f9f7 26 void rtc_init(void) {
<> 144:ef7eb2e8f9f7 27
<> 144:ef7eb2e8f9f7 28 NVIC_EnableIRQ(RTC0_IRQn); // Enable Interrupt for the RTC in the core.
<> 144:ef7eb2e8f9f7 29 //NRF_RTC0->TASKS_STOP =1;
<> 144:ef7eb2e8f9f7 30 NRF_RTC0->PRESCALER = RTC0_COUNTER_PRESCALER; // Set prescaler to a TICK of RTC_FREQUENCY.
<> 144:ef7eb2e8f9f7 31 NRF_RTC0->CC[0] = COMPARE_COUNTERTIME; // Compare0 after approx COMPARE_COUNTERTIME seconds.
<> 144:ef7eb2e8f9f7 32
<> 144:ef7eb2e8f9f7 33 // Enable COMPARE0 event and COMPARE0 interrupt:
<> 144:ef7eb2e8f9f7 34 NRF_RTC0->EVTENSET = RTC_EVTENSET_COMPARE0_Msk;
<> 144:ef7eb2e8f9f7 35 NRF_RTC0->INTENSET = RTC_INTENSET_COMPARE0_Msk;
<> 144:ef7eb2e8f9f7 36 NRF_RTC0->TASKS_START = 1;
<> 144:ef7eb2e8f9f7 37 }
<> 144:ef7eb2e8f9f7 38
<> 144:ef7eb2e8f9f7 39 void rtc_free(void) {
<> 144:ef7eb2e8f9f7 40 // [TODO]
<> 144:ef7eb2e8f9f7 41 }
<> 144:ef7eb2e8f9f7 42
<> 144:ef7eb2e8f9f7 43 /*
<> 144:ef7eb2e8f9f7 44 * Little check routine to see if the RTC has been enabled
<> 144:ef7eb2e8f9f7 45 *
<> 144:ef7eb2e8f9f7 46 * Clock Control Register
<> 144:ef7eb2e8f9f7 47 * RTC_CCR[0] : 0 = Disabled, 1 = Enabled
<> 144:ef7eb2e8f9f7 48 *
<> 144:ef7eb2e8f9f7 49 */
<> 144:ef7eb2e8f9f7 50 int rtc_isenabled(void) {
<> 144:ef7eb2e8f9f7 51 // [TODO] return(((NRF_RTC0->TASKS_START) & 0x01) != 0);
<> 144:ef7eb2e8f9f7 52 }
<> 144:ef7eb2e8f9f7 53
<> 144:ef7eb2e8f9f7 54 time_t rtc_read(void) {
<> 144:ef7eb2e8f9f7 55
<> 144:ef7eb2e8f9f7 56 time_t t = initTime;
<> 144:ef7eb2e8f9f7 57 t += (86400*NRF_RTC0->EVENTS_COMPARE[0]);
<> 144:ef7eb2e8f9f7 58 t += (int)((NRF_RTC0->COUNTER)/8);
<> 144:ef7eb2e8f9f7 59 return(t);
<> 144:ef7eb2e8f9f7 60 }
<> 144:ef7eb2e8f9f7 61
<> 144:ef7eb2e8f9f7 62 void rtc_write(time_t t) {
<> 144:ef7eb2e8f9f7 63 // Convert the time in to a tm
<> 144:ef7eb2e8f9f7 64
<> 144:ef7eb2e8f9f7 65 // Pause clock, and clear counter register (clears us count)
<> 144:ef7eb2e8f9f7 66 NRF_RTC0->TASKS_STOP = 1;
<> 144:ef7eb2e8f9f7 67
<> 144:ef7eb2e8f9f7 68 initTime = t;
<> 144:ef7eb2e8f9f7 69 // Restart clock
<> 144:ef7eb2e8f9f7 70 NRF_RTC0->TASKS_START = 1;
<> 144:ef7eb2e8f9f7 71 }