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mbed SDK library sources

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Development branch of the mbed library sources. This library is kept in synch with the latest changes from the mbed SDK and it is not guaranteed to work.

If you are looking for a stable and tested release, please import one of the official mbed library releases:

Import librarymbed

The official Mbed 2 C/C++ SDK provides the software platform and libraries to build your applications.

Last commit 20 Feb 2019 by mbed official

targets/hal/TARGET_Freescale/TARGET_K20D5M/rtc_api.c@68:41613245dfd7, 2013-12-26 (annotated)

Committer:
mbed_official
Date:
Thu Dec 26 13:00:06 2013 +0000
Revision:
68:41613245dfd7
Synchronized with git revision fba199a9c4445231b0f38e1e113c118182635546



Full URL: https://github.com/mbedmicro/mbed/commit/fba199a9c4445231b0f38e1e113c118182635546/



target K20D5M

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 68:41613245dfd7 1 /* mbed Microcontroller Library
mbed_official 68:41613245dfd7 2 * Copyright (c) 2006-2013 ARM Limited
mbed_official 68:41613245dfd7 3 *
mbed_official 68:41613245dfd7 4 * Licensed under the Apache License, Version 2.0 (the "License");
mbed_official 68:41613245dfd7 5 * you may not use this file except in compliance with the License.
mbed_official 68:41613245dfd7 6 * You may obtain a copy of the License at
mbed_official 68:41613245dfd7 7 *
mbed_official 68:41613245dfd7 8 * http://www.apache.org/licenses/LICENSE-2.0
mbed_official 68:41613245dfd7 9 *
mbed_official 68:41613245dfd7 10 * Unless required by applicable law or agreed to in writing, software
mbed_official 68:41613245dfd7 11 * distributed under the License is distributed on an "AS IS" BASIS,
mbed_official 68:41613245dfd7 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
mbed_official 68:41613245dfd7 13 * See the License for the specific language governing permissions and
mbed_official 68:41613245dfd7 14 * limitations under the License.
mbed_official 68:41613245dfd7 15 */
mbed_official 68:41613245dfd7 16 #include "rtc_api.h"
mbed_official 68:41613245dfd7 17
mbed_official 68:41613245dfd7 18 static void init(void) {
mbed_official 68:41613245dfd7 19 // enable PORTC clock
mbed_official 68:41613245dfd7 20 SIM->SCGC5 |= SIM_SCGC5_PORTC_MASK;
mbed_official 68:41613245dfd7 21
mbed_official 68:41613245dfd7 22 // enable RTC clock
mbed_official 68:41613245dfd7 23 SIM->SCGC6 |= SIM_SCGC6_RTC_MASK;
mbed_official 68:41613245dfd7 24
mbed_official 68:41613245dfd7 25 // OSC32 as source
mbed_official 68:41613245dfd7 26 SIM->SOPT1 &= ~SIM_SOPT1_OSC32KSEL_MASK;
mbed_official 68:41613245dfd7 27 SIM->SOPT1 |= SIM_SOPT1_OSC32KSEL(0);
mbed_official 68:41613245dfd7 28 }
mbed_official 68:41613245dfd7 29
mbed_official 68:41613245dfd7 30 void rtc_init(void) {
mbed_official 68:41613245dfd7 31 init();
mbed_official 68:41613245dfd7 32
mbed_official 68:41613245dfd7 33 // Enable the oscillator
mbed_official 68:41613245dfd7 34 RTC->CR |= RTC_CR_OSCE_MASK;
mbed_official 68:41613245dfd7 35
mbed_official 68:41613245dfd7 36 //Configure the TSR. default value: 1
mbed_official 68:41613245dfd7 37 RTC->TSR = 1;
mbed_official 68:41613245dfd7 38
mbed_official 68:41613245dfd7 39 // enable counter
mbed_official 68:41613245dfd7 40 RTC->SR |= RTC_SR_TCE_MASK;
mbed_official 68:41613245dfd7 41 }
mbed_official 68:41613245dfd7 42
mbed_official 68:41613245dfd7 43 void rtc_free(void) {
mbed_official 68:41613245dfd7 44 // [TODO]
mbed_official 68:41613245dfd7 45 }
mbed_official 68:41613245dfd7 46
mbed_official 68:41613245dfd7 47 /*
mbed_official 68:41613245dfd7 48 * Little check routine to see if the RTC has been enabled
mbed_official 68:41613245dfd7 49 * 0 = Disabled, 1 = Enabled
mbed_official 68:41613245dfd7 50 */
mbed_official 68:41613245dfd7 51 int rtc_isenabled(void) {
mbed_official 68:41613245dfd7 52 // even if the RTC module is enabled,
mbed_official 68:41613245dfd7 53 // as we use RTC_CLKIN and an external clock,
mbed_official 68:41613245dfd7 54 // we need to reconfigure the pins. That is why we
mbed_official 68:41613245dfd7 55 // call init() if the rtc is enabled
mbed_official 68:41613245dfd7 56
mbed_official 68:41613245dfd7 57 // if RTC not enabled return 0
mbed_official 68:41613245dfd7 58 SIM->SCGC5 |= SIM_SCGC5_PORTC_MASK;
mbed_official 68:41613245dfd7 59 SIM->SCGC6 |= SIM_SCGC6_RTC_MASK;
mbed_official 68:41613245dfd7 60 if ((RTC->SR & RTC_SR_TCE_MASK) == 0)
mbed_official 68:41613245dfd7 61 return 0;
mbed_official 68:41613245dfd7 62
mbed_official 68:41613245dfd7 63 init();
mbed_official 68:41613245dfd7 64 return 1;
mbed_official 68:41613245dfd7 65 }
mbed_official 68:41613245dfd7 66
mbed_official 68:41613245dfd7 67 time_t rtc_read(void) {
mbed_official 68:41613245dfd7 68 return RTC->TSR;
mbed_official 68:41613245dfd7 69 }
mbed_official 68:41613245dfd7 70
mbed_official 68:41613245dfd7 71 void rtc_write(time_t t) {
mbed_official 68:41613245dfd7 72 // disable counter
mbed_official 68:41613245dfd7 73 RTC->SR &= ~RTC_SR_TCE_MASK;
mbed_official 68:41613245dfd7 74
mbed_official 68:41613245dfd7 75 // we do not write 0 into TSR
mbed_official 68:41613245dfd7 76 // to avoid invalid time
mbed_official 68:41613245dfd7 77 if (t == 0)
mbed_official 68:41613245dfd7 78 t = 1;
mbed_official 68:41613245dfd7 79
mbed_official 68:41613245dfd7 80 // write seconds
mbed_official 68:41613245dfd7 81 RTC->TSR = t;
mbed_official 68:41613245dfd7 82
mbed_official 68:41613245dfd7 83 // re-enable counter
mbed_official 68:41613245dfd7 84 RTC->SR |= RTC_SR_TCE_MASK;
mbed_official 68:41613245dfd7 85 }