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