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Superseded

This library was superseded by mbed-dev - https://os.mbed.com/users/mbed_official/code/mbed-dev/.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

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_STM/TARGET_NUCLEO_L152RE/rtc_api.c@268:402bcc0c870b, 2014-07-29 (annotated)

Committer:
mbed_official
Date:
Tue Jul 29 19:00:07 2014 +0100
Revision:
268:402bcc0c870b
Parent:
216:577900467c9e
Child:
354:e67efb2aab0e
Synchronized with git revision 490d1a6606b3138f165c5edf2f2370ca616587c0



Full URL: https://github.com/mbedmicro/mbed/commit/490d1a6606b3138f165c5edf2f2370ca616587c0/



[LPC1114] Sleep fix + some device.h settings

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 76:aeb1df146756 1 /* mbed Microcontroller Library
mbed_official 76:aeb1df146756 2 *******************************************************************************
mbed_official 76:aeb1df146756 3 * Copyright (c) 2014, STMicroelectronics
mbed_official 76:aeb1df146756 4 * All rights reserved.
mbed_official 76:aeb1df146756 5 *
mbed_official 76:aeb1df146756 6 * Redistribution and use in source and binary forms, with or without
mbed_official 76:aeb1df146756 7 * modification, are permitted provided that the following conditions are met:
mbed_official 76:aeb1df146756 8 *
mbed_official 76:aeb1df146756 9 * 1. Redistributions of source code must retain the above copyright notice,
mbed_official 76:aeb1df146756 10 * this list of conditions and the following disclaimer.
mbed_official 76:aeb1df146756 11 * 2. Redistributions in binary form must reproduce the above copyright notice,
mbed_official 76:aeb1df146756 12 * this list of conditions and the following disclaimer in the documentation
mbed_official 76:aeb1df146756 13 * and/or other materials provided with the distribution.
mbed_official 76:aeb1df146756 14 * 3. Neither the name of STMicroelectronics nor the names of its contributors
mbed_official 76:aeb1df146756 15 * may be used to endorse or promote products derived from this software
mbed_official 76:aeb1df146756 16 * without specific prior written permission.
mbed_official 76:aeb1df146756 17 *
mbed_official 76:aeb1df146756 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
mbed_official 76:aeb1df146756 19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
mbed_official 76:aeb1df146756 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
mbed_official 76:aeb1df146756 21 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
mbed_official 76:aeb1df146756 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
mbed_official 76:aeb1df146756 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
mbed_official 76:aeb1df146756 24 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
mbed_official 76:aeb1df146756 25 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
mbed_official 76:aeb1df146756 26 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
mbed_official 76:aeb1df146756 27 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
mbed_official 76:aeb1df146756 28 *******************************************************************************
mbed_official 76:aeb1df146756 29 */
mbed_official 76:aeb1df146756 30 #include "rtc_api.h"
mbed_official 76:aeb1df146756 31
mbed_official 174:8bb9f3a33240 32 #if DEVICE_RTC
mbed_official 174:8bb9f3a33240 33
mbed_official 174:8bb9f3a33240 34 #include "wait_api.h"
mbed_official 174:8bb9f3a33240 35
mbed_official 174:8bb9f3a33240 36 #define LSE_STARTUP_TIMEOUT ((uint16_t)400) // delay in ms
mbed_official 174:8bb9f3a33240 37
mbed_official 76:aeb1df146756 38 static int rtc_inited = 0;
mbed_official 76:aeb1df146756 39
mbed_official 76:aeb1df146756 40 void rtc_init(void) {
mbed_official 174:8bb9f3a33240 41 uint32_t StartUpCounter = 0;
mbed_official 174:8bb9f3a33240 42 uint32_t LSEStatus = 0;
mbed_official 174:8bb9f3a33240 43 uint32_t rtc_freq = 0;
mbed_official 174:8bb9f3a33240 44
mbed_official 76:aeb1df146756 45 RCC_APB1PeriphClockCmd(RCC_APB1Periph_PWR, ENABLE); // Enable PWR clock
mbed_official 76:aeb1df146756 46
mbed_official 174:8bb9f3a33240 47 PWR_RTCAccessCmd(ENABLE); // Enable access to Backup domain
mbed_official 174:8bb9f3a33240 48
mbed_official 174:8bb9f3a33240 49 // Reset RTC and Backup registers
mbed_official 174:8bb9f3a33240 50 RCC_RTCResetCmd(ENABLE);
mbed_official 174:8bb9f3a33240 51 RCC_RTCResetCmd(DISABLE);
mbed_official 174:8bb9f3a33240 52
mbed_official 174:8bb9f3a33240 53 // Enable LSE clock
mbed_official 174:8bb9f3a33240 54 RCC_LSEConfig(RCC_LSE_ON);
mbed_official 76:aeb1df146756 55
mbed_official 174:8bb9f3a33240 56 // Wait till LSE is ready
mbed_official 174:8bb9f3a33240 57 do {
mbed_official 174:8bb9f3a33240 58 LSEStatus = RCC_GetFlagStatus(RCC_FLAG_LSERDY);
mbed_official 174:8bb9f3a33240 59 wait_ms(1);
mbed_official 174:8bb9f3a33240 60 StartUpCounter++;
mbed_official 174:8bb9f3a33240 61 } while ((LSEStatus == 0) && (StartUpCounter <= LSE_STARTUP_TIMEOUT));
mbed_official 76:aeb1df146756 62
mbed_official 174:8bb9f3a33240 63 if (StartUpCounter > LSE_STARTUP_TIMEOUT) {
mbed_official 174:8bb9f3a33240 64 // The LSE has not started, use LSI instead.
mbed_official 174:8bb9f3a33240 65 // The RTC Clock may vary due to LSI frequency dispersion.
mbed_official 174:8bb9f3a33240 66 RCC_LSEConfig(RCC_LSE_OFF);
mbed_official 174:8bb9f3a33240 67 RCC_LSICmd(ENABLE); // Enable LSI
mbed_official 174:8bb9f3a33240 68 while (RCC_GetFlagStatus(RCC_FLAG_LSIRDY) == RESET) {} // Wait until ready
mbed_official 174:8bb9f3a33240 69 RCC_RTCCLKConfig(RCC_RTCCLKSource_LSI); // Select the RTC Clock Source
mbed_official 174:8bb9f3a33240 70 rtc_freq = 40000; // [TODO] To be measured precisely using a timer input capture
mbed_official 174:8bb9f3a33240 71 } else {
mbed_official 174:8bb9f3a33240 72 // The LSE has correctly started
mbed_official 174:8bb9f3a33240 73 RCC_RTCCLKConfig(RCC_RTCCLKSource_LSE); // Select the RTC Clock Source
mbed_official 174:8bb9f3a33240 74 rtc_freq = LSE_VALUE;
mbed_official 174:8bb9f3a33240 75 }
mbed_official 76:aeb1df146756 76
mbed_official 76:aeb1df146756 77 RTC_InitTypeDef RTC_InitStructure;
mbed_official 76:aeb1df146756 78 RTC_InitStructure.RTC_AsynchPrediv = 127;
mbed_official 174:8bb9f3a33240 79 RTC_InitStructure.RTC_SynchPrediv = (rtc_freq / 128) - 1;
mbed_official 76:aeb1df146756 80 RTC_InitStructure.RTC_HourFormat = RTC_HourFormat_24;
mbed_official 76:aeb1df146756 81 RTC_Init(&RTC_InitStructure);
mbed_official 174:8bb9f3a33240 82
mbed_official 174:8bb9f3a33240 83 RCC_RTCCLKCmd(ENABLE); // Enable RTC Clock
mbed_official 174:8bb9f3a33240 84
mbed_official 174:8bb9f3a33240 85 RTC_WaitForSynchro(); // Wait for RTC registers synchronization
mbed_official 174:8bb9f3a33240 86
mbed_official 174:8bb9f3a33240 87 PWR_RTCAccessCmd(DISABLE); // Disable access to Backup domain
mbed_official 174:8bb9f3a33240 88
mbed_official 76:aeb1df146756 89 rtc_inited = 1;
mbed_official 76:aeb1df146756 90 }
mbed_official 76:aeb1df146756 91
mbed_official 76:aeb1df146756 92 void rtc_free(void) {
mbed_official 216:577900467c9e 93 // Reset RTC
mbed_official 216:577900467c9e 94 PWR_RTCAccessCmd(ENABLE); // Enable access to Backup Domain
mbed_official 216:577900467c9e 95 RTC_DeInit();
mbed_official 216:577900467c9e 96 RCC_RTCResetCmd(ENABLE);
mbed_official 216:577900467c9e 97 RCC_RTCResetCmd(DISABLE);
mbed_official 216:577900467c9e 98 // Disable RTC, LSE and LSI clocks
mbed_official 216:577900467c9e 99 RCC_RTCCLKCmd(DISABLE);
mbed_official 216:577900467c9e 100 RCC_LSEConfig(RCC_LSE_OFF);
mbed_official 216:577900467c9e 101 RCC_LSICmd(DISABLE);
mbed_official 216:577900467c9e 102
mbed_official 76:aeb1df146756 103 rtc_inited = 0;
mbed_official 76:aeb1df146756 104 }
mbed_official 76:aeb1df146756 105
mbed_official 76:aeb1df146756 106 int rtc_isenabled(void) {
mbed_official 76:aeb1df146756 107 return rtc_inited;
mbed_official 76:aeb1df146756 108 }
mbed_official 76:aeb1df146756 109
mbed_official 76:aeb1df146756 110 /*
mbed_official 76:aeb1df146756 111 RTC Registers
mbed_official 76:aeb1df146756 112 RTC_WeekDay 1=monday, 2=tuesday, ..., 7=sunday
mbed_official 76:aeb1df146756 113 RTC_Month 1=january, 2=february, ..., 12=december
mbed_official 76:aeb1df146756 114 RTC_Date day of the month 1-31
mbed_official 76:aeb1df146756 115 RTC_Year year 0-99
mbed_official 76:aeb1df146756 116 struct tm
mbed_official 76:aeb1df146756 117 tm_sec seconds after the minute 0-61
mbed_official 76:aeb1df146756 118 tm_min minutes after the hour 0-59
mbed_official 76:aeb1df146756 119 tm_hour hours since midnight 0-23
mbed_official 76:aeb1df146756 120 tm_mday day of the month 1-31
mbed_official 76:aeb1df146756 121 tm_mon months since January 0-11
mbed_official 76:aeb1df146756 122 tm_year years since 1900
mbed_official 76:aeb1df146756 123 tm_wday days since Sunday 0-6
mbed_official 76:aeb1df146756 124 tm_yday days since January 1 0-365
mbed_official 76:aeb1df146756 125 tm_isdst Daylight Saving Time flag
mbed_official 76:aeb1df146756 126 */
mbed_official 76:aeb1df146756 127 time_t rtc_read(void) {
mbed_official 76:aeb1df146756 128 RTC_DateTypeDef dateStruct;
mbed_official 76:aeb1df146756 129 RTC_TimeTypeDef timeStruct;
mbed_official 76:aeb1df146756 130 struct tm timeinfo;
mbed_official 174:8bb9f3a33240 131
mbed_official 76:aeb1df146756 132 // Read actual date and time
mbed_official 76:aeb1df146756 133 RTC_GetTime(RTC_Format_BIN, &timeStruct);
mbed_official 76:aeb1df146756 134 RTC_GetDate(RTC_Format_BIN, &dateStruct);
mbed_official 174:8bb9f3a33240 135
mbed_official 76:aeb1df146756 136 // Setup a tm structure based on the RTC
mbed_official 76:aeb1df146756 137 timeinfo.tm_wday = dateStruct.RTC_WeekDay;
mbed_official 76:aeb1df146756 138 timeinfo.tm_mon = dateStruct.RTC_Month - 1;
mbed_official 76:aeb1df146756 139 timeinfo.tm_mday = dateStruct.RTC_Date;
mbed_official 76:aeb1df146756 140 timeinfo.tm_year = dateStruct.RTC_Year + 100;
mbed_official 76:aeb1df146756 141 timeinfo.tm_hour = timeStruct.RTC_Hours;
mbed_official 76:aeb1df146756 142 timeinfo.tm_min = timeStruct.RTC_Minutes;
mbed_official 76:aeb1df146756 143 timeinfo.tm_sec = timeStruct.RTC_Seconds;
mbed_official 174:8bb9f3a33240 144
mbed_official 76:aeb1df146756 145 // Convert to timestamp
mbed_official 76:aeb1df146756 146 time_t t = mktime(&timeinfo);
mbed_official 174:8bb9f3a33240 147
mbed_official 174:8bb9f3a33240 148 return t;
mbed_official 76:aeb1df146756 149 }
mbed_official 76:aeb1df146756 150
mbed_official 76:aeb1df146756 151 void rtc_write(time_t t) {
mbed_official 76:aeb1df146756 152 RTC_DateTypeDef dateStruct;
mbed_official 76:aeb1df146756 153 RTC_TimeTypeDef timeStruct;
mbed_official 76:aeb1df146756 154
mbed_official 76:aeb1df146756 155 // Convert the time into a tm
mbed_official 76:aeb1df146756 156 struct tm *timeinfo = localtime(&t);
mbed_official 174:8bb9f3a33240 157
mbed_official 76:aeb1df146756 158 // Fill RTC structures
mbed_official 76:aeb1df146756 159 dateStruct.RTC_WeekDay = timeinfo->tm_wday;
mbed_official 76:aeb1df146756 160 dateStruct.RTC_Month = timeinfo->tm_mon + 1;
mbed_official 76:aeb1df146756 161 dateStruct.RTC_Date = timeinfo->tm_mday;
mbed_official 76:aeb1df146756 162 dateStruct.RTC_Year = timeinfo->tm_year - 100;
mbed_official 76:aeb1df146756 163 timeStruct.RTC_Hours = timeinfo->tm_hour;
mbed_official 76:aeb1df146756 164 timeStruct.RTC_Minutes = timeinfo->tm_min;
mbed_official 76:aeb1df146756 165 timeStruct.RTC_Seconds = timeinfo->tm_sec;
mbed_official 76:aeb1df146756 166 timeStruct.RTC_H12 = RTC_HourFormat_24;
mbed_official 174:8bb9f3a33240 167
mbed_official 76:aeb1df146756 168 // Change the RTC current date/time
mbed_official 174:8bb9f3a33240 169 PWR_RTCAccessCmd(ENABLE); // Enable access to Backup domain
mbed_official 76:aeb1df146756 170 RTC_SetDate(RTC_Format_BIN, &dateStruct);
mbed_official 174:8bb9f3a33240 171 RTC_SetTime(RTC_Format_BIN, &timeStruct);
mbed_official 174:8bb9f3a33240 172 PWR_RTCAccessCmd(DISABLE); // Disable access to Backup domain
mbed_official 76:aeb1df146756 173 }
mbed_official 174:8bb9f3a33240 174
mbed_official 174:8bb9f3a33240 175 #endif