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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.

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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_KL46Z/rtc_api.c@31:42176bc3c368, 2013-09-25 (annotated)

Committer:
mbed_official
Date:
Wed Sep 25 11:30:05 2013 +0100
Revision:
31:42176bc3c368
Child:
33:e214068ab66c
Synchronized with git revision f580c008b139a952d38ac5c7c53bbae375739c67

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 31:42176bc3c368 1 /* mbed Microcontroller Library
mbed_official 31:42176bc3c368 2 * Copyright (c) 2006-2013 ARM Limited
mbed_official 31:42176bc3c368 3 *
mbed_official 31:42176bc3c368 4 * Licensed under the Apache License, Version 2.0 (the "License");
mbed_official 31:42176bc3c368 5 * you may not use this file except in compliance with the License.
mbed_official 31:42176bc3c368 6 * You may obtain a copy of the License at
mbed_official 31:42176bc3c368 7 *
mbed_official 31:42176bc3c368 8 * http://www.apache.org/licenses/LICENSE-2.0
mbed_official 31:42176bc3c368 9 *
mbed_official 31:42176bc3c368 10 * Unless required by applicable law or agreed to in writing, software
mbed_official 31:42176bc3c368 11 * distributed under the License is distributed on an "AS IS" BASIS,
mbed_official 31:42176bc3c368 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
mbed_official 31:42176bc3c368 13 * See the License for the specific language governing permissions and
mbed_official 31:42176bc3c368 14 * limitations under the License.
mbed_official 31:42176bc3c368 15 */
mbed_official 31:42176bc3c368 16 #include "rtc_api.h"
mbed_official 31:42176bc3c368 17
mbed_official 31:42176bc3c368 18 static void init(void) {
mbed_official 31:42176bc3c368 19 // enable PORTC clock
mbed_official 31:42176bc3c368 20 SIM->SCGC5 |= SIM_SCGC5_PORTC_MASK;
mbed_official 31:42176bc3c368 21
mbed_official 31:42176bc3c368 22 // enable RTC clock
mbed_official 31:42176bc3c368 23 SIM->SCGC6 |= SIM_SCGC6_RTC_MASK;
mbed_official 31:42176bc3c368 24
mbed_official 31:42176bc3c368 25 /*
mbed_official 31:42176bc3c368 26 * configure PTC1 with alternate function 1: RTC_CLKIN
mbed_official 31:42176bc3c368 27 * As the kl25z board does not have a 32kHz osc,
mbed_official 31:42176bc3c368 28 * we use an external clock generated by the
mbed_official 31:42176bc3c368 29 * interface chip
mbed_official 31:42176bc3c368 30 */
mbed_official 31:42176bc3c368 31 PORTC->PCR[1] &= ~PORT_PCR_MUX_MASK;
mbed_official 31:42176bc3c368 32 PORTC->PCR[1] = PORT_PCR_MUX(1);
mbed_official 31:42176bc3c368 33
mbed_official 31:42176bc3c368 34 // select RTC_CLKIN as RTC clock source
mbed_official 31:42176bc3c368 35 SIM->SOPT1 &= ~SIM_SOPT1_OSC32KSEL_MASK;
mbed_official 31:42176bc3c368 36 SIM->SOPT1 |= SIM_SOPT1_OSC32KSEL(2);
mbed_official 31:42176bc3c368 37 }
mbed_official 31:42176bc3c368 38
mbed_official 31:42176bc3c368 39 void rtc_init(void) {
mbed_official 31:42176bc3c368 40 init();
mbed_official 31:42176bc3c368 41
mbed_official 31:42176bc3c368 42 //Configure the TSR. default value: 1
mbed_official 31:42176bc3c368 43 RTC->TSR = 1;
mbed_official 31:42176bc3c368 44
mbed_official 31:42176bc3c368 45 // enable counter
mbed_official 31:42176bc3c368 46 RTC->SR |= RTC_SR_TCE_MASK;
mbed_official 31:42176bc3c368 47 }
mbed_official 31:42176bc3c368 48
mbed_official 31:42176bc3c368 49 void rtc_free(void) {
mbed_official 31:42176bc3c368 50 // [TODO]
mbed_official 31:42176bc3c368 51 }
mbed_official 31:42176bc3c368 52
mbed_official 31:42176bc3c368 53 /*
mbed_official 31:42176bc3c368 54 * Little check routine to see if the RTC has been enabled
mbed_official 31:42176bc3c368 55 * 0 = Disabled, 1 = Enabled
mbed_official 31:42176bc3c368 56 */
mbed_official 31:42176bc3c368 57 int rtc_isenabled(void) {
mbed_official 31:42176bc3c368 58 // even if the RTC module is enabled,
mbed_official 31:42176bc3c368 59 // as we use RTC_CLKIN and an external clock,
mbed_official 31:42176bc3c368 60 // we need to reconfigure the pins. That is why we
mbed_official 31:42176bc3c368 61 // call init() if the rtc is enabled
mbed_official 31:42176bc3c368 62
mbed_official 31:42176bc3c368 63 // if RTC not enabled return 0
mbed_official 31:42176bc3c368 64 SIM->SCGC5 |= SIM_SCGC5_PORTC_MASK;
mbed_official 31:42176bc3c368 65 SIM->SCGC6 |= SIM_SCGC6_RTC_MASK;
mbed_official 31:42176bc3c368 66 if ((RTC->SR & RTC_SR_TCE_MASK) == 0)
mbed_official 31:42176bc3c368 67 return 0;
mbed_official 31:42176bc3c368 68
mbed_official 31:42176bc3c368 69 init();
mbed_official 31:42176bc3c368 70 return 1;
mbed_official 31:42176bc3c368 71 }
mbed_official 31:42176bc3c368 72
mbed_official 31:42176bc3c368 73 time_t rtc_read(void) {
mbed_official 31:42176bc3c368 74 return RTC->TSR;
mbed_official 31:42176bc3c368 75 }
mbed_official 31:42176bc3c368 76
mbed_official 31:42176bc3c368 77 void rtc_write(time_t t) {
mbed_official 31:42176bc3c368 78 // disable counter
mbed_official 31:42176bc3c368 79 RTC->SR &= ~RTC_SR_TCE_MASK;
mbed_official 31:42176bc3c368 80
mbed_official 31:42176bc3c368 81 // we do not write 0 into TSR
mbed_official 31:42176bc3c368 82 // to avoid invalid time
mbed_official 31:42176bc3c368 83 if (t == 0)
mbed_official 31:42176bc3c368 84 t = 1;
mbed_official 31:42176bc3c368 85
mbed_official 31:42176bc3c368 86 // write seconds
mbed_official 31:42176bc3c368 87 RTC->TSR = t;
mbed_official 31:42176bc3c368 88
mbed_official 31:42176bc3c368 89 // re-enable counter
mbed_official 31:42176bc3c368 90 RTC->SR |= RTC_SR_TCE_MASK;
mbed_official 31:42176bc3c368 91 }