mbed official / mbed-dev

mbed library sources. Supersedes mbed-src.

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

targets/hal/TARGET_NORDIC/TARGET_MCU_NRF51822/TARGET_DELTA_DFCM_NNN40/rtc_api.c@0:9b334a45a8ff, 2015-10-01 (annotated)

Committer:
bogdanm
Date:
Thu Oct 01 15:25:22 2015 +0300
Revision:
0:9b334a45a8ff
Child:
144:ef7eb2e8f9f7
Initial commit on mbed-dev



Replaces mbed-src (now inactive)

Who changed what in which revision?

UserRevisionLine numberNew contents of line
bogdanm 0:9b334a45a8ff 1 /* mbed Microcontroller Library
bogdanm 0:9b334a45a8ff 2 * Copyright (c) 2006-2013 ARM Limited
bogdanm 0:9b334a45a8ff 3 *
bogdanm 0:9b334a45a8ff 4 * Licensed under the Apache License, Version 2.0 (the "License");
bogdanm 0:9b334a45a8ff 5 * you may not use this file except in compliance with the License.
bogdanm 0:9b334a45a8ff 6 * You may obtain a copy of the License at
bogdanm 0:9b334a45a8ff 7 *
bogdanm 0:9b334a45a8ff 8 * http://www.apache.org/licenses/LICENSE-2.0
bogdanm 0:9b334a45a8ff 9 *
bogdanm 0:9b334a45a8ff 10 * Unless required by applicable law or agreed to in writing, software
bogdanm 0:9b334a45a8ff 11 * distributed under the License is distributed on an "AS IS" BASIS,
bogdanm 0:9b334a45a8ff 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
bogdanm 0:9b334a45a8ff 13 * See the License for the specific language governing permissions and
bogdanm 0:9b334a45a8ff 14 * limitations under the License.
bogdanm 0:9b334a45a8ff 15 */
bogdanm 0:9b334a45a8ff 16 #include "rtc_api.h"
bogdanm 0:9b334a45a8ff 17
bogdanm 0:9b334a45a8ff 18
bogdanm 0:9b334a45a8ff 19 #define LFCLK_FREQUENCY (32768UL)
bogdanm 0:9b334a45a8ff 20 #define RTC0_COUNTER_PRESCALER ((LFCLK_FREQUENCY/8) - 1)
bogdanm 0:9b334a45a8ff 21 #define COMPARE_COUNTERTIME (691200UL) //86400 x 8
bogdanm 0:9b334a45a8ff 22
bogdanm 0:9b334a45a8ff 23
bogdanm 0:9b334a45a8ff 24 time_t initTime;
bogdanm 0:9b334a45a8ff 25
bogdanm 0:9b334a45a8ff 26 void rtc_init(void) {
bogdanm 0:9b334a45a8ff 27
bogdanm 0:9b334a45a8ff 28 NVIC_EnableIRQ(RTC0_IRQn); // Enable Interrupt for the RTC in the core.
bogdanm 0:9b334a45a8ff 29 //NRF_RTC0->TASKS_STOP =1;
bogdanm 0:9b334a45a8ff 30 NRF_RTC0->PRESCALER = RTC0_COUNTER_PRESCALER; // Set prescaler to a TICK of RTC_FREQUENCY.
bogdanm 0:9b334a45a8ff 31 NRF_RTC0->CC[0] = COMPARE_COUNTERTIME; // Compare0 after approx COMPARE_COUNTERTIME seconds.
bogdanm 0:9b334a45a8ff 32
bogdanm 0:9b334a45a8ff 33 // Enable COMPARE0 event and COMPARE0 interrupt:
bogdanm 0:9b334a45a8ff 34 NRF_RTC0->EVTENSET = RTC_EVTENSET_COMPARE0_Msk;
bogdanm 0:9b334a45a8ff 35 NRF_RTC0->INTENSET = RTC_INTENSET_COMPARE0_Msk;
bogdanm 0:9b334a45a8ff 36 NRF_RTC0->TASKS_START = 1;
bogdanm 0:9b334a45a8ff 37 }
bogdanm 0:9b334a45a8ff 38
bogdanm 0:9b334a45a8ff 39 void rtc_free(void) {
bogdanm 0:9b334a45a8ff 40 // [TODO]
bogdanm 0:9b334a45a8ff 41 }
bogdanm 0:9b334a45a8ff 42
bogdanm 0:9b334a45a8ff 43 /*
bogdanm 0:9b334a45a8ff 44 * Little check routine to see if the RTC has been enabled
bogdanm 0:9b334a45a8ff 45 *
bogdanm 0:9b334a45a8ff 46 * Clock Control Register
bogdanm 0:9b334a45a8ff 47 * RTC_CCR[0] : 0 = Disabled, 1 = Enabled
bogdanm 0:9b334a45a8ff 48 *
bogdanm 0:9b334a45a8ff 49 */
bogdanm 0:9b334a45a8ff 50 int rtc_isenabled(void) {
bogdanm 0:9b334a45a8ff 51 // [TODO] return(((NRF_RTC0->TASKS_START) & 0x01) != 0);
bogdanm 0:9b334a45a8ff 52 }
bogdanm 0:9b334a45a8ff 53
bogdanm 0:9b334a45a8ff 54 time_t rtc_read(void) {
bogdanm 0:9b334a45a8ff 55
bogdanm 0:9b334a45a8ff 56 time_t t = initTime;
bogdanm 0:9b334a45a8ff 57 t += (86400*NRF_RTC0->EVENTS_COMPARE[0]);
bogdanm 0:9b334a45a8ff 58 t += (int)((NRF_RTC0->COUNTER)/8);
bogdanm 0:9b334a45a8ff 59 return(t);
bogdanm 0:9b334a45a8ff 60 }
bogdanm 0:9b334a45a8ff 61
bogdanm 0:9b334a45a8ff 62 void rtc_write(time_t t) {
bogdanm 0:9b334a45a8ff 63 // Convert the time in to a tm
bogdanm 0:9b334a45a8ff 64
bogdanm 0:9b334a45a8ff 65 // Pause clock, and clear counter register (clears us count)
bogdanm 0:9b334a45a8ff 66 NRF_RTC0->TASKS_STOP = 1;
bogdanm 0:9b334a45a8ff 67
bogdanm 0:9b334a45a8ff 68 initTime = t;
bogdanm 0:9b334a45a8ff 69 // Restart clock
bogdanm 0:9b334a45a8ff 70 NRF_RTC0->TASKS_START = 1;
bogdanm 0:9b334a45a8ff 71 }