t
Fork of mbed-dev by
targets/hal/TARGET_Silicon_Labs/TARGET_EFM32/rtc_api.c
- Committer:
- <>
- Date:
- 2016-09-02
- Revision:
- 144:ef7eb2e8f9f7
- Parent:
- 50:a417edff4437
File content as of revision 144:ef7eb2e8f9f7:
/***************************************************************************//** * @file rtc_api.c ******************************************************************************* * @section License * <b>(C) Copyright 2015 Silicon Labs, http://www.silabs.com</b> ******************************************************************************* * * SPDX-License-Identifier: Apache-2.0 * * 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 "device.h" #if DEVICE_RTC #include "rtc_api.h" #include "rtc_api_HAL.h" #include "em_cmu.h" #include "sleep_api.h" #include "sleepmodes.h" #if (defined RTC_COUNT) && (RTC_COUNT > 0) #include "em_rtc.h" #endif #if (defined RTCC_COUNT) && (RTCC_COUNT > 0) #include "em_rtcc.h" #endif static bool rtc_inited = false; static time_t time_base = 0; static uint32_t useflags = 0; static uint32_t time_extend = 0; static void (*comp0_handler)(void) = NULL; #ifndef RTCC_COUNT /* Using RTC API */ #define RTC_LEAST_ACTIVE_SLEEPMODE EM2 #define RTC_NUM_BITS (24) void RTC_IRQHandler(void) { uint32_t flags; flags = RTC_IntGet(); if (flags & RTC_IF_OF) { RTC_IntClear(RTC_IF_OF); /* RTC has overflowed (24 bits). Use time_extend as software counter for 32 more bits. */ time_extend += 1; } if (flags & RTC_IF_COMP0) { RTC_IntClear(RTC_IF_COMP0); if (comp0_handler != NULL) { comp0_handler(); } } } uint32_t rtc_get_32bit(void) { uint32_t pending = (RTC_IntGet() & RTC_IF_OF) ? 1 : 0; return (RTC_CounterGet() + ((time_extend + pending) << RTC_NUM_BITS)); } uint64_t rtc_get_full(void) { uint64_t ticks = 0; ticks += time_extend; ticks = ticks << RTC_NUM_BITS; ticks += RTC_CounterGet(); return ticks; } void rtc_init_real(uint32_t flags) { useflags |= flags; if (!rtc_inited) { CMU_ClockEnable(cmuClock_RTC, true); /* Enable clock to the interface of the low energy modules */ CMU_ClockEnable(cmuClock_CORELE, true); /* Scale clock to save power */ CMU_ClockDivSet(cmuClock_RTC, RTC_CLOCKDIV); /* Initialize RTC */ RTC_Init_TypeDef init = RTC_INIT_DEFAULT; init.enable = 1; /* Don't use compare register 0 as top value */ init.comp0Top = 0; /* Enable Interrupt from RTC */ RTC_IntEnable(RTC_IEN_OF); NVIC_SetVector(RTC_IRQn, (uint32_t)RTC_IRQHandler); NVIC_EnableIRQ(RTC_IRQn); /* Initialize */ RTC_Init(&init); blockSleepMode(RTC_LEAST_ACTIVE_SLEEPMODE); rtc_inited = true; } } void rtc_free(void) { rtc_free_real(RTC_INIT_RTC); } void rtc_free_real(uint32_t flags) { /* Clear use flag */ useflags &= ~flags; /* Disable the RTC if it was inited and is no longer in use by anyone. */ if (rtc_inited && (useflags == 0)) { NVIC_DisableIRQ(RTC_IRQn); RTC_Reset(); CMU_ClockEnable(cmuClock_RTC, false); unblockSleepMode(RTC_LEAST_ACTIVE_SLEEPMODE); rtc_inited = false; } } #else /* Using RTCC API */ #define RTCC_LEAST_ACTIVE_SLEEPMODE EM2 #define RTCC_NUM_BITS (32) void RTCC_IRQHandler(void) { uint32_t flags; flags = RTCC_IntGet(); if (flags & RTCC_IF_OF) { RTCC_IntClear(RTCC_IF_OF); /* RTC has overflowed (32 bits). Use time_extend as software counter for 32 more bits. */ time_extend += 1; } if (flags & RTCC_IF_CC0) { RTCC_IntClear(RTCC_IF_CC0); if (comp0_handler != NULL) { comp0_handler(); } } } uint32_t rtc_get_32bit(void) { return RTCC_CounterGet(); } uint64_t rtc_get_full(void) { uint64_t ticks = 0; ticks += time_extend; ticks = ticks << RTCC_NUM_BITS; ticks += RTCC_CounterGet(); return ticks; } void rtc_init_real(uint32_t flags) { useflags |= flags; if (!rtc_inited) { CMU_ClockEnable(cmuClock_RTCC, true); /* Enable clock to the interface of the low energy modules */ CMU_ClockEnable(cmuClock_CORELE, true); /* Initialize RTC */ RTCC_Init_TypeDef init = RTCC_INIT_DEFAULT; init.enable = 1; init.precntWrapOnCCV0 = false; init.cntWrapOnCCV1 = false; #if RTC_CLOCKDIV_INT == 8 init.presc = rtccCntPresc_8; #else #error invalid prescaler value RTC_CLOCKDIV_INT #endif /* Enable Interrupt from RTC */ RTCC_IntEnable(RTCC_IEN_OF); NVIC_SetVector(RTCC_IRQn, (uint32_t)RTCC_IRQHandler); NVIC_EnableIRQ(RTCC_IRQn); /* Initialize */ RTCC_Init(&init); blockSleepMode(RTCC_LEAST_ACTIVE_SLEEPMODE); rtc_inited = true; } } void rtc_free(void) { rtc_free_real(RTC_INIT_RTC); } void rtc_free_real(uint32_t flags) { /* Clear use flag */ useflags &= ~flags; /* Disable the RTC if it was inited and is no longer in use by anyone. */ if (rtc_inited && (useflags == 0)) { NVIC_DisableIRQ(RTCC_IRQn); RTCC_Reset(); CMU_ClockEnable(cmuClock_RTCC, false); unblockSleepMode(RTCC_LEAST_ACTIVE_SLEEPMODE); rtc_inited = false; } } #endif /* RTCC_COUNT */ void rtc_set_comp0_handler(uint32_t handler) { comp0_handler = (void (*)(void)) handler; } void rtc_init(void) { /* Register that the RTC is used for timekeeping. */ rtc_init_real(RTC_INIT_RTC); } int rtc_isenabled(void) { return rtc_inited; } time_t rtc_read(void) { return (time_t) (rtc_get_full() >> RTC_FREQ_SHIFT) + time_base; } time_t rtc_read_uncompensated(void) { return (time_t) (rtc_get_full() >> RTC_FREQ_SHIFT); } void rtc_write(time_t t) { /* We have to check that the RTC did not tick while doing this. */ /* If the RTC ticks we just redo this. */ uint32_t time; do { time = rtc_read_uncompensated(); time_base = t - time; } while (time != (uint32_t)rtc_read_uncompensated()); } #endif