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targets/hal/TARGET_Freescale/TARGET_KLXX/rtc_api.c
- Committer:
- bogdanm
- Date:
- 2015-10-01
- Revision:
- 0:9b334a45a8ff
- Child:
- 56:05912f50f004
File content as of revision 0:9b334a45a8ff:
/* 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" #include "PeripheralPins.h" #include "clk_freqs.h" static void init(void) { // enable RTC clock SIM->SCGC6 |= SIM_SCGC6_RTC_MASK; // select RTC clock source SIM->SOPT1 &= ~SIM_SOPT1_OSC32KSEL_MASK; // Enable external crystal source if clock source is 32KHz if (extosc_frequency()==32768) { SIM->SOPT1 |= SIM_SOPT1_OSC32KSEL(OSC32KCLK); } else{ // If main clock is NOT 32KHz crystal, use external 32KHz clock source defined in PeripheralPins.c SIM->SOPT1 |= SIM_SOPT1_OSC32KSEL(PinMap_RTC[0].peripheral); pinmap_pinout(PinMap_RTC[0].pin, PinMap_RTC); //Map RTC clk input (if not NC) } } void rtc_init(void) { init(); //Configure the TSR. default value: 1 RTC->TSR = 1; if (PinMap_RTC[0].pin == NC) { //Use OSC32K RTC->CR |= RTC_CR_OSCE_MASK; //delay for OSCE stabilization for(int i=0; i<0x1000; i++) __NOP(); } // enable counter RTC->SR |= RTC_SR_TCE_MASK; } void rtc_free(void) { // [TODO] } /* * Little check routine to see if the RTC has been enabled * 0 = Disabled, 1 = Enabled */ int rtc_isenabled(void) { // even if the RTC module is enabled, // as we use RTC_CLKIN and an external clock, // we need to reconfigure the pins. That is why we // call init() if the rtc is enabled // if RTC not enabled return 0 SIM->SCGC5 |= SIM_SCGC5_PORTA_MASK; SIM->SCGC6 |= SIM_SCGC6_RTC_MASK; if ((RTC->SR & RTC_SR_TCE_MASK) == 0) return 0; init(); return 1; } time_t rtc_read(void) { return RTC->TSR; } void rtc_write(time_t t) { // disable counter RTC->SR &= ~RTC_SR_TCE_MASK; // we do not write 0 into TSR // to avoid invalid time if (t == 0) t = 1; // write seconds RTC->TSR = t; // re-enable counter RTC->SR |= RTC_SR_TCE_MASK; }