shao ziyang / mbed-src-kl05

mbed library sources

Dependents:   frdm_kl05z_gpio_test

Fork of mbed-src by mbed official

targets/hal/TARGET_Freescale/TARGET_KLXX/rtc_api.c@82:0b31dbcd4769, 2014-01-31 (annotated)

Committer:
mbed_official
Date:
Fri Jan 31 10:00:06 2014 +0000
Revision:
82:0b31dbcd4769
Synchronized with git revision 74409cbd593d1daab530a57baaa563f30b04b018



Full URL: https://github.com/mbedmicro/mbed/commit/74409cbd593d1daab530a57baaa563f30b04b018/

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 82:0b31dbcd4769 1 /* mbed Microcontroller Library
mbed_official 82:0b31dbcd4769 2 * Copyright (c) 2006-2013 ARM Limited
mbed_official 82:0b31dbcd4769 3 *
mbed_official 82:0b31dbcd4769 4 * Licensed under the Apache License, Version 2.0 (the "License");
mbed_official 82:0b31dbcd4769 5 * you may not use this file except in compliance with the License.
mbed_official 82:0b31dbcd4769 6 * You may obtain a copy of the License at
mbed_official 82:0b31dbcd4769 7 *
mbed_official 82:0b31dbcd4769 8 * http://www.apache.org/licenses/LICENSE-2.0
mbed_official 82:0b31dbcd4769 9 *
mbed_official 82:0b31dbcd4769 10 * Unless required by applicable law or agreed to in writing, software
mbed_official 82:0b31dbcd4769 11 * distributed under the License is distributed on an "AS IS" BASIS,
mbed_official 82:0b31dbcd4769 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
mbed_official 82:0b31dbcd4769 13 * See the License for the specific language governing permissions and
mbed_official 82:0b31dbcd4769 14 * limitations under the License.
mbed_official 82:0b31dbcd4769 15 */
mbed_official 82:0b31dbcd4769 16 #include "rtc_api.h"
mbed_official 82:0b31dbcd4769 17 #include "PeripheralPins.h"
mbed_official 82:0b31dbcd4769 18
mbed_official 82:0b31dbcd4769 19 static void init(void) {
mbed_official 82:0b31dbcd4769 20 // enable RTC clock
mbed_official 82:0b31dbcd4769 21 SIM->SCGC6 |= SIM_SCGC6_RTC_MASK;
mbed_official 82:0b31dbcd4769 22
mbed_official 82:0b31dbcd4769 23 pinmap_pinout(PinMap_RTC[0].pin, PinMap_RTC); //Map RTC clk input (if not NC)
mbed_official 82:0b31dbcd4769 24
mbed_official 82:0b31dbcd4769 25 // select RTC clock source
mbed_official 82:0b31dbcd4769 26 SIM->SOPT1 &= ~SIM_SOPT1_OSC32KSEL_MASK;
mbed_official 82:0b31dbcd4769 27 SIM->SOPT1 |= SIM_SOPT1_OSC32KSEL(PinMap_RTC[0].peripheral);
mbed_official 82:0b31dbcd4769 28 }
mbed_official 82:0b31dbcd4769 29
mbed_official 82:0b31dbcd4769 30 void rtc_init(void) {
mbed_official 82:0b31dbcd4769 31 init();
mbed_official 82:0b31dbcd4769 32
mbed_official 82:0b31dbcd4769 33 //Configure the TSR. default value: 1
mbed_official 82:0b31dbcd4769 34 RTC->TSR = 1;
mbed_official 82:0b31dbcd4769 35
mbed_official 82:0b31dbcd4769 36 if (PinMap_RTC[0].pin == NC) { //Use OSC32K
mbed_official 82:0b31dbcd4769 37 RTC->CR |= RTC_CR_OSCE_MASK;
mbed_official 82:0b31dbcd4769 38 //delay for OSCE stabilization
mbed_official 82:0b31dbcd4769 39 for(int i=0; i<0x1000; i++) __NOP();
mbed_official 82:0b31dbcd4769 40 }
mbed_official 82:0b31dbcd4769 41
mbed_official 82:0b31dbcd4769 42 // enable counter
mbed_official 82:0b31dbcd4769 43 RTC->SR |= RTC_SR_TCE_MASK;
mbed_official 82:0b31dbcd4769 44 }
mbed_official 82:0b31dbcd4769 45
mbed_official 82:0b31dbcd4769 46 void rtc_free(void) {
mbed_official 82:0b31dbcd4769 47 // [TODO]
mbed_official 82:0b31dbcd4769 48 }
mbed_official 82:0b31dbcd4769 49
mbed_official 82:0b31dbcd4769 50 /*
mbed_official 82:0b31dbcd4769 51 * Little check routine to see if the RTC has been enabled
mbed_official 82:0b31dbcd4769 52 * 0 = Disabled, 1 = Enabled
mbed_official 82:0b31dbcd4769 53 */
mbed_official 82:0b31dbcd4769 54 int rtc_isenabled(void) {
mbed_official 82:0b31dbcd4769 55 // even if the RTC module is enabled,
mbed_official 82:0b31dbcd4769 56 // as we use RTC_CLKIN and an external clock,
mbed_official 82:0b31dbcd4769 57 // we need to reconfigure the pins. That is why we
mbed_official 82:0b31dbcd4769 58 // call init() if the rtc is enabled
mbed_official 82:0b31dbcd4769 59
mbed_official 82:0b31dbcd4769 60 // if RTC not enabled return 0
mbed_official 82:0b31dbcd4769 61 SIM->SCGC5 |= SIM_SCGC5_PORTA_MASK;
mbed_official 82:0b31dbcd4769 62 SIM->SCGC6 |= SIM_SCGC6_RTC_MASK;
mbed_official 82:0b31dbcd4769 63 if ((RTC->SR & RTC_SR_TCE_MASK) == 0)
mbed_official 82:0b31dbcd4769 64 return 0;
mbed_official 82:0b31dbcd4769 65
mbed_official 82:0b31dbcd4769 66 init();
mbed_official 82:0b31dbcd4769 67 return 1;
mbed_official 82:0b31dbcd4769 68 }
mbed_official 82:0b31dbcd4769 69
mbed_official 82:0b31dbcd4769 70 time_t rtc_read(void) {
mbed_official 82:0b31dbcd4769 71 return RTC->TSR;
mbed_official 82:0b31dbcd4769 72 }
mbed_official 82:0b31dbcd4769 73
mbed_official 82:0b31dbcd4769 74 void rtc_write(time_t t) {
mbed_official 82:0b31dbcd4769 75 // disable counter
mbed_official 82:0b31dbcd4769 76 RTC->SR &= ~RTC_SR_TCE_MASK;
mbed_official 82:0b31dbcd4769 77
mbed_official 82:0b31dbcd4769 78 // we do not write 0 into TSR
mbed_official 82:0b31dbcd4769 79 // to avoid invalid time
mbed_official 82:0b31dbcd4769 80 if (t == 0)
mbed_official 82:0b31dbcd4769 81 t = 1;
mbed_official 82:0b31dbcd4769 82
mbed_official 82:0b31dbcd4769 83 // write seconds
mbed_official 82:0b31dbcd4769 84 RTC->TSR = t;
mbed_official 82:0b31dbcd4769 85
mbed_official 82:0b31dbcd4769 86 // re-enable counter
mbed_official 82:0b31dbcd4769 87 RTC->SR |= RTC_SR_TCE_MASK;
mbed_official 82:0b31dbcd4769 88 }