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Superseded

This library was superseded by mbed-dev - https://os.mbed.com/users/mbed_official/code/mbed-dev/.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_F302R8/rtc_api.c@135:067cc8ba23da, 2014-03-25 (annotated)

Committer:
mbed_official
Date:
Tue Mar 25 10:15:07 2014 +0000
Revision:
135:067cc8ba23da
Parent:
125:23cc3068a9e4
Child:
162:937d965048d3
Synchronized with git revision 11bc6fdd038cd58284639ec6ff158b57e4b4bf68



Full URL: https://github.com/mbedmicro/mbed/commit/11bc6fdd038cd58284639ec6ff158b57e4b4bf68/



[NUCLEO_F302R8] Improvements in clock configuration, spi default pins, code formatting

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 125:23cc3068a9e4 1 /* mbed Microcontroller Library
mbed_official 125:23cc3068a9e4 2 *******************************************************************************
mbed_official 125:23cc3068a9e4 3 * Copyright (c) 2014, STMicroelectronics
mbed_official 125:23cc3068a9e4 4 * All rights reserved.
mbed_official 125:23cc3068a9e4 5 *
mbed_official 125:23cc3068a9e4 6 * Redistribution and use in source and binary forms, with or without
mbed_official 125:23cc3068a9e4 7 * modification, are permitted provided that the following conditions are met:
mbed_official 125:23cc3068a9e4 8 *
mbed_official 125:23cc3068a9e4 9 * 1. Redistributions of source code must retain the above copyright notice,
mbed_official 125:23cc3068a9e4 10 * this list of conditions and the following disclaimer.
mbed_official 125:23cc3068a9e4 11 * 2. Redistributions in binary form must reproduce the above copyright notice,
mbed_official 125:23cc3068a9e4 12 * this list of conditions and the following disclaimer in the documentation
mbed_official 125:23cc3068a9e4 13 * and/or other materials provided with the distribution.
mbed_official 125:23cc3068a9e4 14 * 3. Neither the name of STMicroelectronics nor the names of its contributors
mbed_official 125:23cc3068a9e4 15 * may be used to endorse or promote products derived from this software
mbed_official 125:23cc3068a9e4 16 * without specific prior written permission.
mbed_official 125:23cc3068a9e4 17 *
mbed_official 125:23cc3068a9e4 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
mbed_official 125:23cc3068a9e4 19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
mbed_official 125:23cc3068a9e4 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
mbed_official 125:23cc3068a9e4 21 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
mbed_official 125:23cc3068a9e4 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
mbed_official 125:23cc3068a9e4 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
mbed_official 125:23cc3068a9e4 24 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
mbed_official 125:23cc3068a9e4 25 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
mbed_official 125:23cc3068a9e4 26 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
mbed_official 125:23cc3068a9e4 27 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
mbed_official 125:23cc3068a9e4 28 *******************************************************************************
mbed_official 125:23cc3068a9e4 29 */
mbed_official 125:23cc3068a9e4 30 #include "rtc_api.h"
mbed_official 125:23cc3068a9e4 31
mbed_official 125:23cc3068a9e4 32 static int rtc_inited = 0;
mbed_official 125:23cc3068a9e4 33
mbed_official 125:23cc3068a9e4 34 void rtc_init(void) {
mbed_official 125:23cc3068a9e4 35 RCC_APB1PeriphClockCmd(RCC_APB1Periph_PWR, ENABLE); // Enable PWR clock
mbed_official 125:23cc3068a9e4 36
mbed_official 125:23cc3068a9e4 37 PWR_BackupAccessCmd(ENABLE); // Enable access to RTC
mbed_official 125:23cc3068a9e4 38
mbed_official 125:23cc3068a9e4 39 // Be sure to start correctly
mbed_official 125:23cc3068a9e4 40 RCC_BackupResetCmd(ENABLE);
mbed_official 125:23cc3068a9e4 41 RCC_BackupResetCmd(DISABLE);
mbed_official 135:067cc8ba23da 42
mbed_official 125:23cc3068a9e4 43 // Note: the LSI is used as RTC source clock
mbed_official 125:23cc3068a9e4 44 // The RTC Clock may vary due to LSI frequency dispersion.
mbed_official 125:23cc3068a9e4 45 RCC_LSICmd(ENABLE); // Enable LSI
mbed_official 135:067cc8ba23da 46
mbed_official 125:23cc3068a9e4 47 while (RCC_GetFlagStatus(RCC_FLAG_LSIRDY) == RESET) {} // Wait until ready
mbed_official 135:067cc8ba23da 48
mbed_official 125:23cc3068a9e4 49 RCC_RTCCLKConfig(RCC_RTCCLKSource_LSI); // Select LSI as RTC Clock Source
mbed_official 135:067cc8ba23da 50
mbed_official 135:067cc8ba23da 51 RCC_RTCCLKCmd(ENABLE); // Enable RTC Clock
mbed_official 135:067cc8ba23da 52
mbed_official 125:23cc3068a9e4 53 RTC_WaitForSynchro(); // Wait for RTC registers synchronization
mbed_official 125:23cc3068a9e4 54
mbed_official 125:23cc3068a9e4 55 uint32_t lsi_freq = 40000; // [TODO] To be measured precisely using a timer input capture
mbed_official 125:23cc3068a9e4 56
mbed_official 125:23cc3068a9e4 57 RTC_InitTypeDef RTC_InitStructure;
mbed_official 125:23cc3068a9e4 58 RTC_InitStructure.RTC_AsynchPrediv = 127;
mbed_official 135:067cc8ba23da 59 RTC_InitStructure.RTC_SynchPrediv = (lsi_freq / 128) - 1;
mbed_official 125:23cc3068a9e4 60 RTC_InitStructure.RTC_HourFormat = RTC_HourFormat_24;
mbed_official 125:23cc3068a9e4 61 RTC_Init(&RTC_InitStructure);
mbed_official 135:067cc8ba23da 62
mbed_official 125:23cc3068a9e4 63 rtc_inited = 1;
mbed_official 125:23cc3068a9e4 64 }
mbed_official 125:23cc3068a9e4 65
mbed_official 125:23cc3068a9e4 66 void rtc_free(void) {
mbed_official 125:23cc3068a9e4 67 RCC_DeInit(); // Resets the RCC clock configuration to the default reset state
mbed_official 125:23cc3068a9e4 68 rtc_inited = 0;
mbed_official 125:23cc3068a9e4 69 }
mbed_official 125:23cc3068a9e4 70
mbed_official 125:23cc3068a9e4 71 int rtc_isenabled(void) {
mbed_official 125:23cc3068a9e4 72 return rtc_inited;
mbed_official 125:23cc3068a9e4 73 }
mbed_official 125:23cc3068a9e4 74
mbed_official 125:23cc3068a9e4 75 /*
mbed_official 125:23cc3068a9e4 76 RTC Registers
mbed_official 125:23cc3068a9e4 77 RTC_WeekDay 1=monday, 2=tuesday, ..., 7=sunday
mbed_official 125:23cc3068a9e4 78 RTC_Month 1=january, 2=february, ..., 12=december
mbed_official 125:23cc3068a9e4 79 RTC_Date day of the month 1-31
mbed_official 125:23cc3068a9e4 80 RTC_Year year 0-99
mbed_official 125:23cc3068a9e4 81 struct tm
mbed_official 125:23cc3068a9e4 82 tm_sec seconds after the minute 0-61
mbed_official 125:23cc3068a9e4 83 tm_min minutes after the hour 0-59
mbed_official 125:23cc3068a9e4 84 tm_hour hours since midnight 0-23
mbed_official 125:23cc3068a9e4 85 tm_mday day of the month 1-31
mbed_official 125:23cc3068a9e4 86 tm_mon months since January 0-11
mbed_official 125:23cc3068a9e4 87 tm_year years since 1900
mbed_official 125:23cc3068a9e4 88 tm_wday days since Sunday 0-6
mbed_official 125:23cc3068a9e4 89 tm_yday days since January 1 0-365
mbed_official 125:23cc3068a9e4 90 tm_isdst Daylight Saving Time flag
mbed_official 125:23cc3068a9e4 91 */
mbed_official 125:23cc3068a9e4 92 time_t rtc_read(void) {
mbed_official 125:23cc3068a9e4 93 RTC_DateTypeDef dateStruct;
mbed_official 125:23cc3068a9e4 94 RTC_TimeTypeDef timeStruct;
mbed_official 125:23cc3068a9e4 95 struct tm timeinfo;
mbed_official 135:067cc8ba23da 96
mbed_official 125:23cc3068a9e4 97 // Read actual date and time
mbed_official 125:23cc3068a9e4 98 RTC_GetTime(RTC_Format_BIN, &timeStruct);
mbed_official 125:23cc3068a9e4 99 RTC_GetDate(RTC_Format_BIN, &dateStruct);
mbed_official 135:067cc8ba23da 100
mbed_official 125:23cc3068a9e4 101 // Setup a tm structure based on the RTC
mbed_official 125:23cc3068a9e4 102 timeinfo.tm_wday = dateStruct.RTC_WeekDay;
mbed_official 125:23cc3068a9e4 103 timeinfo.tm_mon = dateStruct.RTC_Month - 1;
mbed_official 125:23cc3068a9e4 104 timeinfo.tm_mday = dateStruct.RTC_Date;
mbed_official 125:23cc3068a9e4 105 timeinfo.tm_year = dateStruct.RTC_Year + 100;
mbed_official 125:23cc3068a9e4 106 timeinfo.tm_hour = timeStruct.RTC_Hours;
mbed_official 125:23cc3068a9e4 107 timeinfo.tm_min = timeStruct.RTC_Minutes;
mbed_official 125:23cc3068a9e4 108 timeinfo.tm_sec = timeStruct.RTC_Seconds;
mbed_official 135:067cc8ba23da 109
mbed_official 125:23cc3068a9e4 110 // Convert to timestamp
mbed_official 125:23cc3068a9e4 111 time_t t = mktime(&timeinfo);
mbed_official 135:067cc8ba23da 112
mbed_official 135:067cc8ba23da 113 return t;
mbed_official 125:23cc3068a9e4 114 }
mbed_official 125:23cc3068a9e4 115
mbed_official 125:23cc3068a9e4 116 void rtc_write(time_t t) {
mbed_official 125:23cc3068a9e4 117 RTC_DateTypeDef dateStruct;
mbed_official 125:23cc3068a9e4 118 RTC_TimeTypeDef timeStruct;
mbed_official 125:23cc3068a9e4 119
mbed_official 125:23cc3068a9e4 120 // Convert the time into a tm
mbed_official 125:23cc3068a9e4 121 struct tm *timeinfo = localtime(&t);
mbed_official 135:067cc8ba23da 122
mbed_official 125:23cc3068a9e4 123 // Fill RTC structures
mbed_official 125:23cc3068a9e4 124 dateStruct.RTC_WeekDay = timeinfo->tm_wday;
mbed_official 125:23cc3068a9e4 125 dateStruct.RTC_Month = timeinfo->tm_mon + 1;
mbed_official 125:23cc3068a9e4 126 dateStruct.RTC_Date = timeinfo->tm_mday;
mbed_official 125:23cc3068a9e4 127 dateStruct.RTC_Year = timeinfo->tm_year - 100;
mbed_official 125:23cc3068a9e4 128 timeStruct.RTC_Hours = timeinfo->tm_hour;
mbed_official 125:23cc3068a9e4 129 timeStruct.RTC_Minutes = timeinfo->tm_min;
mbed_official 125:23cc3068a9e4 130 timeStruct.RTC_Seconds = timeinfo->tm_sec;
mbed_official 125:23cc3068a9e4 131 timeStruct.RTC_H12 = RTC_HourFormat_24;
mbed_official 135:067cc8ba23da 132
mbed_official 125:23cc3068a9e4 133 // Change the RTC current date/time
mbed_official 135:067cc8ba23da 134 PWR_BackupAccessCmd(ENABLE); // Enable access to RTC
mbed_official 125:23cc3068a9e4 135 RTC_SetDate(RTC_Format_BIN, &dateStruct);
mbed_official 135:067cc8ba23da 136 RTC_SetTime(RTC_Format_BIN, &timeStruct);
mbed_official 125:23cc3068a9e4 137 PWR_BackupAccessCmd(DISABLE); // Disable access to RTC
mbed_official 125:23cc3068a9e4 138 }