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targets/hal/TARGET_Freescale/TARGET_KL46Z/rtc_api.c
- Committer:
- mbed_official
- Date:
- 2013-10-07
- Revision:
- 33:e214068ab66c
- Parent:
- 31:42176bc3c368
File content as of revision 33:e214068ab66c:
/* 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" static void init(void) { // enable PORTC clock SIM->SCGC5 |= SIM_SCGC5_PORTC_MASK; // enable RTC clock SIM->SCGC6 |= SIM_SCGC6_RTC_MASK; /* * configure PTC1 with alternate function 1: RTC_CLKIN * As the KL46Z board does not have a 32kHz osc, * we use an external clock generated by the * interface chip */ PORTC->PCR[1] &= ~PORT_PCR_MUX_MASK; PORTC->PCR[1] = PORT_PCR_MUX(1); // select RTC_CLKIN as RTC clock source SIM->SOPT1 &= ~SIM_SOPT1_OSC32KSEL_MASK; SIM->SOPT1 |= SIM_SOPT1_OSC32KSEL(2); } void rtc_init(void) { init(); //Configure the TSR. default value: 1 RTC->TSR = 1; // 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_PORTC_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; }