mbed library sources. Supersedes mbed-src.
Dependents: Nucleo_Hello_Encoder BLE_iBeaconScan AM1805_DEMO DISCO-F429ZI_ExportTemplate1 ... more
Diff: targets/TARGET_NORDIC/TARGET_MCU_NRF51822/TARGET_DELTA_DFCM_NNN40/rtc_api.c
- Revision:
- 149:156823d33999
- Parent:
- 144:ef7eb2e8f9f7
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/targets/TARGET_NORDIC/TARGET_MCU_NRF51822/TARGET_DELTA_DFCM_NNN40/rtc_api.c Fri Oct 28 11:17:30 2016 +0100 @@ -0,0 +1,71 @@ +/* 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; +}