/* mbed Microcontroller Library * Copyright (c) 2006-2013 ARM Limited * 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 "rtc_api.h" #if DEVICE_RTC #include "fsl_snvs_lp.h" static bool rtc_time_set = false; void rtc_init(void) { snvs_lp_srtc_config_t snvsRtcConfig; SNVS_LP_SRTC_GetDefaultConfig(&snvsRtcConfig); SNVS_LP_SRTC_Init(SNVS, &snvsRtcConfig); SNVS_LP_SRTC_StartTimer(SNVS); } void rtc_free(void) { #if (!(defined(FSL_SDK_DISABLE_DRIVER_CLOCK_CONTROL) && FSL_SDK_DISABLE_DRIVER_CLOCK_CONTROL) && \ defined(SNVS_LP_CLOCKS)) CLOCK_DisableClock(kCLOCK_SnvsLp0); #endif /* FSL_SDK_DISABLE_DRIVER_CLOCK_CONTROL */ } /* * Little check routine to see if the RTC has been enabled * 0 = Disabled, 1 = Enabled */ int rtc_isenabled(void) { #if (!(defined(FSL_SDK_DISABLE_DRIVER_CLOCK_CONTROL) && FSL_SDK_DISABLE_DRIVER_CLOCK_CONTROL) && \ defined(SNVS_LP_CLOCKS)) CLOCK_EnableClock(kCLOCK_SnvsLp0); #endif /* FSL_SDK_DISABLE_DRIVER_CLOCK_CONTROL */ const bool rtc_init_done = ((SNVS->LPCR & SNVS_LPCR_SRTC_ENV_MASK) >> SNVS_LPCR_SRTC_ENV_SHIFT); /* If RTC is not initialized, then disable the clock gate on exit. */ if(!rtc_init_done) { rtc_free(); } return (rtc_init_done & rtc_time_set); } time_t rtc_read(void) { uint32_t seconds = 0; uint32_t tmp = 0; /* Do consecutive reads until value is correct */ do { seconds = tmp; tmp = (SNVS->LPSRTCMR << 17U) | (SNVS->LPSRTCLR >> 15U); } while (tmp != seconds); return (time_t)seconds; } void rtc_write(time_t t) { if (t == 0) { t = 1; } SNVS_LP_SRTC_StopTimer(SNVS); SNVS->LPSRTCMR = (uint32_t)(t >> 17U); SNVS->LPSRTCLR = (uint32_t)(t << 15U); SNVS_LP_SRTC_StartTimer(SNVS); rtc_time_set = true; } #endif