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This library was superseded by mbed-dev - https://os.mbed.com/users/mbed_official/code/mbed-dev/.

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:

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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_STM/TARGET_NUCLEO_F103RB/rtc_api.c@62:7731d679ae64, 2013-12-17 (annotated)

Committer:
mbed_official
Date:
Tue Dec 17 11:00:05 2013 +0000
Revision:
62:7731d679ae64
Parent:
60:142c6c6f5949
Child:
70:c1fbde68b492
Synchronized with git revision 1eec522274f4b78e86504ad3cde3c10574392441



Full URL: https://github.com/mbedmicro/mbed/commit/1eec522274f4b78e86504ad3cde3c10574392441/



[NUCLEO_F103RB] Use HSI/LSI instead of HSE/LSE (board rev C constraint)

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 60:142c6c6f5949 1 /* mbed Microcontroller Library
mbed_official 60:142c6c6f5949 2 * Copyright (c) 2006-2013 ARM Limited
mbed_official 60:142c6c6f5949 3 *
mbed_official 60:142c6c6f5949 4 * Licensed under the Apache License, Version 2.0 (the "License");
mbed_official 60:142c6c6f5949 5 * you may not use this file except in compliance with the License.
mbed_official 60:142c6c6f5949 6 * You may obtain a copy of the License at
mbed_official 60:142c6c6f5949 7 *
mbed_official 60:142c6c6f5949 8 * http://www.apache.org/licenses/LICENSE-2.0
mbed_official 60:142c6c6f5949 9 *
mbed_official 60:142c6c6f5949 10 * Unless required by applicable law or agreed to in writing, software
mbed_official 60:142c6c6f5949 11 * distributed under the License is distributed on an "AS IS" BASIS,
mbed_official 60:142c6c6f5949 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
mbed_official 60:142c6c6f5949 13 * See the License for the specific language governing permissions and
mbed_official 60:142c6c6f5949 14 * limitations under the License.
mbed_official 60:142c6c6f5949 15 */
mbed_official 60:142c6c6f5949 16 #include "rtc_api.h"
mbed_official 60:142c6c6f5949 17
mbed_official 60:142c6c6f5949 18 static int rtc_inited = 0;
mbed_official 60:142c6c6f5949 19
mbed_official 60:142c6c6f5949 20 void rtc_init(void) {
mbed_official 60:142c6c6f5949 21 RCC_APB1PeriphClockCmd(RCC_APB1Periph_PWR | RCC_APB1Periph_BKP, ENABLE); // Enable PWR and Backup clock
mbed_official 60:142c6c6f5949 22
mbed_official 60:142c6c6f5949 23 PWR_BackupAccessCmd(ENABLE); // Allow access to Backup Domain
mbed_official 60:142c6c6f5949 24
mbed_official 60:142c6c6f5949 25 BKP_DeInit(); // Reset Backup Domain
mbed_official 60:142c6c6f5949 26
mbed_official 62:7731d679ae64 27 // Uncomment these lines if you use the LSE
mbed_official 60:142c6c6f5949 28 // Enable LSE and wait till it's ready
mbed_official 62:7731d679ae64 29 //RCC_LSEConfig(RCC_LSE_ON);
mbed_official 62:7731d679ae64 30 //while (RCC_GetFlagStatus(RCC_FLAG_LSERDY) == RESET) {}
mbed_official 62:7731d679ae64 31 //RCC_RTCCLKConfig(RCC_RTCCLKSource_LSE); // Select LSE as RTC Clock Source
mbed_official 60:142c6c6f5949 32
mbed_official 62:7731d679ae64 33 // Uncomment these lines if you use the LSI
mbed_official 62:7731d679ae64 34 // Enable LSI and wait till it's ready
mbed_official 62:7731d679ae64 35 RCC_LSICmd(ENABLE);
mbed_official 62:7731d679ae64 36 while (RCC_GetFlagStatus(RCC_FLAG_LSIRDY) == RESET) {}
mbed_official 62:7731d679ae64 37 RCC_RTCCLKConfig(RCC_RTCCLKSource_LSI); // Select LSI as RTC Clock Source
mbed_official 62:7731d679ae64 38
mbed_official 60:142c6c6f5949 39 RCC_RTCCLKCmd(ENABLE); // Enable RTC Clock
mbed_official 60:142c6c6f5949 40
mbed_official 60:142c6c6f5949 41 RTC_WaitForSynchro(); // Wait for RTC registers synchronization
mbed_official 60:142c6c6f5949 42
mbed_official 60:142c6c6f5949 43 RTC_WaitForLastTask(); // Wait until last write operation on RTC registers has finished
mbed_official 60:142c6c6f5949 44
mbed_official 60:142c6c6f5949 45 // Set RTC period to 1 sec
mbed_official 62:7731d679ae64 46 // For LSE: prescaler = RTCCLK/RTC period = 32768Hz/1Hz = 32768
mbed_official 62:7731d679ae64 47 // For LSI: prescaler = RTCCLK/RTC period = 40000Hz/1Hz = 40000
mbed_official 62:7731d679ae64 48 RTC_SetPrescaler(39999);
mbed_official 60:142c6c6f5949 49
mbed_official 60:142c6c6f5949 50 RTC_WaitForLastTask(); // Wait until last write operation on RTC registers has finished
mbed_official 60:142c6c6f5949 51
mbed_official 60:142c6c6f5949 52 rtc_inited = 1;
mbed_official 60:142c6c6f5949 53 }
mbed_official 60:142c6c6f5949 54
mbed_official 60:142c6c6f5949 55 void rtc_free(void) {
mbed_official 60:142c6c6f5949 56 RCC_DeInit(); // Resets the RCC clock configuration to the default reset state
mbed_official 60:142c6c6f5949 57 rtc_inited = 0;
mbed_official 60:142c6c6f5949 58 }
mbed_official 60:142c6c6f5949 59
mbed_official 60:142c6c6f5949 60 int rtc_isenabled(void) {
mbed_official 60:142c6c6f5949 61 return rtc_inited;
mbed_official 60:142c6c6f5949 62 }
mbed_official 60:142c6c6f5949 63
mbed_official 60:142c6c6f5949 64 time_t rtc_read(void) {
mbed_official 60:142c6c6f5949 65 return (time_t)RTC_GetCounter();
mbed_official 60:142c6c6f5949 66 }
mbed_official 60:142c6c6f5949 67
mbed_official 60:142c6c6f5949 68 void rtc_write(time_t t) {
mbed_official 60:142c6c6f5949 69 RTC_WaitForLastTask(); // Wait until last write operation on RTC registers has finished
mbed_official 60:142c6c6f5949 70 RTC_SetCounter(t); // Change the current time
mbed_official 60:142c6c6f5949 71 RTC_WaitForLastTask(); // Wait until last write operation on RTC registers has finished
mbed_official 60:142c6c6f5949 72 }