mbed library sources: Modified to operate FRDM-KL25Z at 48MHz from internal 32kHz oscillator (nothing else changed).
Fork of mbed-src by
The only file that changed is: mbed-src-FLL48/targets/cmsis/TARGET_Freescale/TARGET_KL25Z/system_MKL25Z4.h
targets/hal/TARGET_Freescale/TARGET_KL05Z/rtc_api.c
- Committer:
- bogdanm
- Date:
- 2013-09-10
- Revision:
- 20:4263a77256ae
File content as of revision 20:4263a77256ae:
/* 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 RTC clock SIM->SCGC6 |= SIM_SCGC6_RTC_MASK; // select OSC32 as RTC clock source SIM->SOPT1 &= ~SIM_SOPT1_OSC32KSEL_MASK; } void rtc_init(void) { uint32_t i; init(); //Configure the TSR. default value: 1 RTC->TSR = 1; RTC->CR |= RTC_CR_OSCE_MASK; //delay for OSCE stabilization for(i=0; i<0x1000; i++) __NOP(); // enable counter RTC->SR |= RTC_SR_TCE_MASK; } void rtc_free(void) { // [TODO] } 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; }