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/* mbed Microcontroller Library
* Copyright (c) 2006-2013 ARM Limited
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "rtc_api.h"
#define LFCLK_FREQUENCY (32768UL)
#define RTC0_COUNTER_PRESCALER ((LFCLK_FREQUENCY/8) - 1)
#define COMPARE_COUNTERTIME (691200UL) //86400 x 8
time_t initTime;
void rtc_init(void) {
NVIC_EnableIRQ(RTC0_IRQn); // Enable Interrupt for the RTC in the core.
//NRF_RTC0->TASKS_STOP =1;
NRF_RTC0->PRESCALER = RTC0_COUNTER_PRESCALER; // Set prescaler to a TICK of RTC_FREQUENCY.
NRF_RTC0->CC[0] = COMPARE_COUNTERTIME; // Compare0 after approx COMPARE_COUNTERTIME seconds.
// Enable COMPARE0 event and COMPARE0 interrupt:
NRF_RTC0->EVTENSET = RTC_EVTENSET_COMPARE0_Msk;
NRF_RTC0->INTENSET = RTC_INTENSET_COMPARE0_Msk;
NRF_RTC0->TASKS_START = 1;
}
void rtc_free(void) {
// [TODO]
}
/*
* Little check routine to see if the RTC has been enabled
*
* Clock Control Register
* RTC_CCR[0] : 0 = Disabled, 1 = Enabled
*
*/
int rtc_isenabled(void) {
// [TODO] return(((NRF_RTC0->TASKS_START) & 0x01) != 0);
}
time_t rtc_read(void) {
time_t t = initTime;
t += (86400*NRF_RTC0->EVENTS_COMPARE[0]);
t += (int)((NRF_RTC0->COUNTER)/8);
return(t);
}
void rtc_write(time_t t) {
// Convert the time in to a tm
// Pause clock, and clear counter register (clears us count)
NRF_RTC0->TASKS_STOP = 1;
initTime = t;
// Restart clock
NRF_RTC0->TASKS_START = 1;
}
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