shao ziyang / mbed-src-kl05

mbed library sources

Dependents:   frdm_kl05z_gpio_test

Fork of mbed-src by mbed official

targets/hal/TARGET_STM/TARGET_DISCO_F303VC/rtc_api.c@323:9e901b0a5aa1, 2014-09-13 (annotated)

Committer:
shaoziyang
Date:
Sat Sep 13 14:25:46 2014 +0000
Revision:
323:9e901b0a5aa1
Parent:
241:ffe41b0c8126 
test with CLOCK_SETUP = 0

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 157:90e3acc479a2 1 /* mbed Microcontroller Library
mbed_official 157:90e3acc479a2 2 *******************************************************************************
mbed_official 157:90e3acc479a2 3 * Copyright (c) 2014, STMicroelectronics
mbed_official 157:90e3acc479a2 4 * All rights reserved.
mbed_official 157:90e3acc479a2 5 *
mbed_official 157:90e3acc479a2 6 * Redistribution and use in source and binary forms, with or without
mbed_official 157:90e3acc479a2 7 * modification, are permitted provided that the following conditions are met:
mbed_official 157:90e3acc479a2 8 *
mbed_official 157:90e3acc479a2 9 * 1. Redistributions of source code must retain the above copyright notice,
mbed_official 157:90e3acc479a2 10 * this list of conditions and the following disclaimer.
mbed_official 157:90e3acc479a2 11 * 2. Redistributions in binary form must reproduce the above copyright notice,
mbed_official 157:90e3acc479a2 12 * this list of conditions and the following disclaimer in the documentation
mbed_official 157:90e3acc479a2 13 * and/or other materials provided with the distribution.
mbed_official 157:90e3acc479a2 14 * 3. Neither the name of STMicroelectronics nor the names of its contributors
mbed_official 157:90e3acc479a2 15 * may be used to endorse or promote products derived from this software
mbed_official 157:90e3acc479a2 16 * without specific prior written permission.
mbed_official 157:90e3acc479a2 17 *
mbed_official 157:90e3acc479a2 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
mbed_official 157:90e3acc479a2 19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
mbed_official 157:90e3acc479a2 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
mbed_official 157:90e3acc479a2 21 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
mbed_official 157:90e3acc479a2 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
mbed_official 157:90e3acc479a2 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
mbed_official 157:90e3acc479a2 24 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
mbed_official 157:90e3acc479a2 25 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
mbed_official 157:90e3acc479a2 26 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
mbed_official 157:90e3acc479a2 27 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
mbed_official 157:90e3acc479a2 28 *******************************************************************************
mbed_official 157:90e3acc479a2 29 */
mbed_official 157:90e3acc479a2 30 #include "rtc_api.h"
mbed_official 157:90e3acc479a2 31
mbed_official 241:ffe41b0c8126 32 #if DEVICE_RTC
mbed_official 241:ffe41b0c8126 33
mbed_official 241:ffe41b0c8126 34 #include "wait_api.h"
mbed_official 241:ffe41b0c8126 35
mbed_official 241:ffe41b0c8126 36 #define LSE_STARTUP_TIMEOUT ((uint16_t)500) // delay in ms
mbed_official 241:ffe41b0c8126 37
mbed_official 157:90e3acc479a2 38 static int rtc_inited = 0;
mbed_official 157:90e3acc479a2 39
mbed_official 157:90e3acc479a2 40 void rtc_init(void) {
mbed_official 241:ffe41b0c8126 41 uint32_t StartUpCounter = 0;
mbed_official 241:ffe41b0c8126 42 uint32_t LSEStatus = 0;
mbed_official 241:ffe41b0c8126 43 uint32_t rtc_freq = 0;
mbed_official 241:ffe41b0c8126 44
mbed_official 157:90e3acc479a2 45 RCC_APB1PeriphClockCmd(RCC_APB1Periph_PWR, ENABLE); // Enable PWR clock
mbed_official 157:90e3acc479a2 46
mbed_official 241:ffe41b0c8126 47 PWR_BackupAccessCmd(ENABLE); // Enable access to Backup domain
mbed_official 157:90e3acc479a2 48
mbed_official 241:ffe41b0c8126 49 // Reset back up registers
mbed_official 157:90e3acc479a2 50 RCC_BackupResetCmd(ENABLE);
mbed_official 157:90e3acc479a2 51 RCC_BackupResetCmd(DISABLE);
mbed_official 157:90e3acc479a2 52
mbed_official 241:ffe41b0c8126 53 // Enable LSE clock
mbed_official 241:ffe41b0c8126 54 RCC_LSEConfig(RCC_LSE_ON);
mbed_official 241:ffe41b0c8126 55
mbed_official 241:ffe41b0c8126 56 // Wait till LSE is ready
mbed_official 241:ffe41b0c8126 57 do {
mbed_official 241:ffe41b0c8126 58 LSEStatus = RCC_GetFlagStatus(RCC_FLAG_LSERDY);
mbed_official 241:ffe41b0c8126 59 wait_ms(1);
mbed_official 241:ffe41b0c8126 60 StartUpCounter++;
mbed_official 241:ffe41b0c8126 61 } while ((LSEStatus == 0) && (StartUpCounter <= LSE_STARTUP_TIMEOUT));
mbed_official 241:ffe41b0c8126 62
mbed_official 241:ffe41b0c8126 63 if (StartUpCounter > LSE_STARTUP_TIMEOUT) {
mbed_official 241:ffe41b0c8126 64 // The LSE has not started, use LSI instead.
mbed_official 157:90e3acc479a2 65 // The RTC Clock may vary due to LSI frequency dispersion.
mbed_official 241:ffe41b0c8126 66 RCC_LSEConfig(RCC_LSE_OFF);
mbed_official 157:90e3acc479a2 67 RCC_LSICmd(ENABLE); // Enable LSI
mbed_official 157:90e3acc479a2 68 while (RCC_GetFlagStatus(RCC_FLAG_LSIRDY) == RESET) {} // Wait until ready
mbed_official 241:ffe41b0c8126 69 RCC_RTCCLKConfig(RCC_RTCCLKSource_LSI); // Select the RTC Clock Source
mbed_official 241:ffe41b0c8126 70 rtc_freq = 40000; // [TODO] To be measured precisely using a timer input capture
mbed_official 241:ffe41b0c8126 71 } else {
mbed_official 241:ffe41b0c8126 72 // The LSE has correctly started
mbed_official 241:ffe41b0c8126 73 RCC_RTCCLKConfig(RCC_RTCCLKSource_LSE); // Select the RTC Clock Source
mbed_official 241:ffe41b0c8126 74 rtc_freq = LSE_VALUE;
mbed_official 241:ffe41b0c8126 75 }
mbed_official 157:90e3acc479a2 76
mbed_official 157:90e3acc479a2 77 RCC_RTCCLKCmd(ENABLE); // Enable RTC Clock
mbed_official 157:90e3acc479a2 78
mbed_official 157:90e3acc479a2 79 RTC_WaitForSynchro(); // Wait for RTC registers synchronization
mbed_official 157:90e3acc479a2 80
mbed_official 157:90e3acc479a2 81 RTC_InitTypeDef RTC_InitStructure;
mbed_official 157:90e3acc479a2 82 RTC_InitStructure.RTC_AsynchPrediv = 127;
mbed_official 241:ffe41b0c8126 83 RTC_InitStructure.RTC_SynchPrediv = (rtc_freq / 128) - 1;
mbed_official 157:90e3acc479a2 84 RTC_InitStructure.RTC_HourFormat = RTC_HourFormat_24;
mbed_official 157:90e3acc479a2 85 RTC_Init(&RTC_InitStructure);
mbed_official 157:90e3acc479a2 86
mbed_official 241:ffe41b0c8126 87 PWR_BackupAccessCmd(DISABLE); // Disable access to Backup domain
mbed_official 241:ffe41b0c8126 88
mbed_official 157:90e3acc479a2 89 rtc_inited = 1;
mbed_official 157:90e3acc479a2 90 }
mbed_official 157:90e3acc479a2 91
mbed_official 157:90e3acc479a2 92 void rtc_free(void) {
mbed_official 241:ffe41b0c8126 93 // Reset RTC
mbed_official 241:ffe41b0c8126 94 PWR_BackupAccessCmd(ENABLE); // Enable access to Backup Domain
mbed_official 241:ffe41b0c8126 95 RTC_DeInit();
mbed_official 241:ffe41b0c8126 96 RCC_BackupResetCmd(ENABLE);
mbed_official 241:ffe41b0c8126 97 RCC_BackupResetCmd(DISABLE);
mbed_official 241:ffe41b0c8126 98 // Disable RTC, LSE and LSI clocks
mbed_official 241:ffe41b0c8126 99 RCC_RTCCLKCmd(DISABLE);
mbed_official 241:ffe41b0c8126 100 RCC_LSEConfig(RCC_LSE_OFF);
mbed_official 241:ffe41b0c8126 101 RCC_LSICmd(DISABLE);
mbed_official 241:ffe41b0c8126 102
mbed_official 157:90e3acc479a2 103 rtc_inited = 0;
mbed_official 157:90e3acc479a2 104 }
mbed_official 157:90e3acc479a2 105
mbed_official 157:90e3acc479a2 106 int rtc_isenabled(void) {
mbed_official 157:90e3acc479a2 107 return rtc_inited;
mbed_official 157:90e3acc479a2 108 }
mbed_official 157:90e3acc479a2 109
mbed_official 157:90e3acc479a2 110 /*
mbed_official 157:90e3acc479a2 111 RTC Registers
mbed_official 157:90e3acc479a2 112 RTC_WeekDay 1=monday, 2=tuesday, ..., 7=sunday
mbed_official 157:90e3acc479a2 113 RTC_Month 1=january, 2=february, ..., 12=december
mbed_official 157:90e3acc479a2 114 RTC_Date day of the month 1-31
mbed_official 157:90e3acc479a2 115 RTC_Year year 0-99
mbed_official 157:90e3acc479a2 116 struct tm
mbed_official 157:90e3acc479a2 117 tm_sec seconds after the minute 0-61
mbed_official 157:90e3acc479a2 118 tm_min minutes after the hour 0-59
mbed_official 157:90e3acc479a2 119 tm_hour hours since midnight 0-23
mbed_official 157:90e3acc479a2 120 tm_mday day of the month 1-31
mbed_official 157:90e3acc479a2 121 tm_mon months since January 0-11
mbed_official 157:90e3acc479a2 122 tm_year years since 1900
mbed_official 157:90e3acc479a2 123 tm_wday days since Sunday 0-6
mbed_official 157:90e3acc479a2 124 tm_yday days since January 1 0-365
mbed_official 157:90e3acc479a2 125 tm_isdst Daylight Saving Time flag
mbed_official 157:90e3acc479a2 126 */
mbed_official 157:90e3acc479a2 127 time_t rtc_read(void) {
mbed_official 157:90e3acc479a2 128 RTC_DateTypeDef dateStruct;
mbed_official 157:90e3acc479a2 129 RTC_TimeTypeDef timeStruct;
mbed_official 157:90e3acc479a2 130 struct tm timeinfo;
mbed_official 157:90e3acc479a2 131
mbed_official 157:90e3acc479a2 132 // Read actual date and time
mbed_official 157:90e3acc479a2 133 RTC_GetTime(RTC_Format_BIN, &timeStruct);
mbed_official 157:90e3acc479a2 134 RTC_GetDate(RTC_Format_BIN, &dateStruct);
mbed_official 157:90e3acc479a2 135
mbed_official 157:90e3acc479a2 136 // Setup a tm structure based on the RTC
mbed_official 157:90e3acc479a2 137 timeinfo.tm_wday = dateStruct.RTC_WeekDay;
mbed_official 157:90e3acc479a2 138 timeinfo.tm_mon = dateStruct.RTC_Month - 1;
mbed_official 157:90e3acc479a2 139 timeinfo.tm_mday = dateStruct.RTC_Date;
mbed_official 157:90e3acc479a2 140 timeinfo.tm_year = dateStruct.RTC_Year + 100;
mbed_official 157:90e3acc479a2 141 timeinfo.tm_hour = timeStruct.RTC_Hours;
mbed_official 157:90e3acc479a2 142 timeinfo.tm_min = timeStruct.RTC_Minutes;
mbed_official 157:90e3acc479a2 143 timeinfo.tm_sec = timeStruct.RTC_Seconds;
mbed_official 157:90e3acc479a2 144
mbed_official 157:90e3acc479a2 145 // Convert to timestamp
mbed_official 157:90e3acc479a2 146 time_t t = mktime(&timeinfo);
mbed_official 157:90e3acc479a2 147
mbed_official 157:90e3acc479a2 148 return t;
mbed_official 157:90e3acc479a2 149 }
mbed_official 157:90e3acc479a2 150
mbed_official 157:90e3acc479a2 151 void rtc_write(time_t t) {
mbed_official 157:90e3acc479a2 152 RTC_DateTypeDef dateStruct;
mbed_official 157:90e3acc479a2 153 RTC_TimeTypeDef timeStruct;
mbed_official 157:90e3acc479a2 154
mbed_official 157:90e3acc479a2 155 // Convert the time into a tm
mbed_official 157:90e3acc479a2 156 struct tm *timeinfo = localtime(&t);
mbed_official 157:90e3acc479a2 157
mbed_official 157:90e3acc479a2 158 // Fill RTC structures
mbed_official 157:90e3acc479a2 159 dateStruct.RTC_WeekDay = timeinfo->tm_wday;
mbed_official 157:90e3acc479a2 160 dateStruct.RTC_Month = timeinfo->tm_mon + 1;
mbed_official 157:90e3acc479a2 161 dateStruct.RTC_Date = timeinfo->tm_mday;
mbed_official 157:90e3acc479a2 162 dateStruct.RTC_Year = timeinfo->tm_year - 100;
mbed_official 157:90e3acc479a2 163 timeStruct.RTC_Hours = timeinfo->tm_hour;
mbed_official 157:90e3acc479a2 164 timeStruct.RTC_Minutes = timeinfo->tm_min;
mbed_official 157:90e3acc479a2 165 timeStruct.RTC_Seconds = timeinfo->tm_sec;
mbed_official 157:90e3acc479a2 166 timeStruct.RTC_H12 = RTC_HourFormat_24;
mbed_official 157:90e3acc479a2 167
mbed_official 157:90e3acc479a2 168 // Change the RTC current date/time
mbed_official 157:90e3acc479a2 169 PWR_BackupAccessCmd(ENABLE); // Enable access to RTC
mbed_official 157:90e3acc479a2 170 RTC_SetDate(RTC_Format_BIN, &dateStruct);
mbed_official 157:90e3acc479a2 171 RTC_SetTime(RTC_Format_BIN, &timeStruct);
mbed_official 157:90e3acc479a2 172 PWR_BackupAccessCmd(DISABLE); // Disable access to RTC
mbed_official 157:90e3acc479a2 173 }
mbed_official 241:ffe41b0c8126 174
mbed_official 241:ffe41b0c8126 175 #endif