Piyamate Wisanuvej / mbed-src-overclock

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targets/hal/TARGET_STM/TARGET_DISCO_F051R8/rtc_api.c@246:15713155d815, 2014-07-01 (annotated)

Committer:
piyamate
Date:
Tue Jul 01 00:03:52 2014 +0000
Revision:
246:15713155d815
Parent:
240:9a7c54113eaf 
Overclock K64F to 128.125MHz

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 130:1dec54e4aec3 1 /* mbed Microcontroller Library
mbed_official 130:1dec54e4aec3 2 *******************************************************************************
mbed_official 130:1dec54e4aec3 3 * Copyright (c) 2014, STMicroelectronics
mbed_official 130:1dec54e4aec3 4 * All rights reserved.
mbed_official 130:1dec54e4aec3 5 *
mbed_official 130:1dec54e4aec3 6 * Redistribution and use in source and binary forms, with or without
mbed_official 130:1dec54e4aec3 7 * modification, are permitted provided that the following conditions are met:
mbed_official 130:1dec54e4aec3 8 *
mbed_official 130:1dec54e4aec3 9 * 1. Redistributions of source code must retain the above copyright notice,
mbed_official 130:1dec54e4aec3 10 * this list of conditions and the following disclaimer.
mbed_official 130:1dec54e4aec3 11 * 2. Redistributions in binary form must reproduce the above copyright notice,
mbed_official 130:1dec54e4aec3 12 * this list of conditions and the following disclaimer in the documentation
mbed_official 130:1dec54e4aec3 13 * and/or other materials provided with the distribution.
mbed_official 130:1dec54e4aec3 14 * 3. Neither the name of STMicroelectronics nor the names of its contributors
mbed_official 130:1dec54e4aec3 15 * may be used to endorse or promote products derived from this software
mbed_official 130:1dec54e4aec3 16 * without specific prior written permission.
mbed_official 130:1dec54e4aec3 17 *
mbed_official 130:1dec54e4aec3 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
mbed_official 130:1dec54e4aec3 19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
mbed_official 130:1dec54e4aec3 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
mbed_official 130:1dec54e4aec3 21 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
mbed_official 130:1dec54e4aec3 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
mbed_official 130:1dec54e4aec3 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
mbed_official 130:1dec54e4aec3 24 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
mbed_official 130:1dec54e4aec3 25 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
mbed_official 130:1dec54e4aec3 26 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
mbed_official 130:1dec54e4aec3 27 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
mbed_official 130:1dec54e4aec3 28 *******************************************************************************
mbed_official 130:1dec54e4aec3 29 */
mbed_official 130:1dec54e4aec3 30 #include "rtc_api.h"
mbed_official 130:1dec54e4aec3 31
mbed_official 240:9a7c54113eaf 32 #if DEVICE_RTC
mbed_official 240:9a7c54113eaf 33
mbed_official 240:9a7c54113eaf 34 #include "wait_api.h"
mbed_official 240:9a7c54113eaf 35
mbed_official 240:9a7c54113eaf 36 #define LSE_STARTUP_TIMEOUT ((uint16_t)500) // delay in ms
mbed_official 240:9a7c54113eaf 37
mbed_official 130:1dec54e4aec3 38 static int rtc_inited = 0;
mbed_official 130:1dec54e4aec3 39
mbed_official 130:1dec54e4aec3 40 void rtc_init(void) {
mbed_official 240:9a7c54113eaf 41 uint32_t StartUpCounter = 0;
mbed_official 240:9a7c54113eaf 42 uint32_t LSEStatus = 0;
mbed_official 240:9a7c54113eaf 43 uint32_t rtc_freq = 0;
mbed_official 240:9a7c54113eaf 44
mbed_official 130:1dec54e4aec3 45 RCC_APB1PeriphClockCmd(RCC_APB1Periph_PWR, ENABLE); // Enable PWR clock
mbed_official 130:1dec54e4aec3 46
mbed_official 240:9a7c54113eaf 47 PWR_BackupAccessCmd(ENABLE); // Enable access to Backup domain
mbed_official 240:9a7c54113eaf 48
mbed_official 240:9a7c54113eaf 49 // Reset back up registers
mbed_official 240:9a7c54113eaf 50 RCC_BackupResetCmd(ENABLE);
mbed_official 240:9a7c54113eaf 51 RCC_BackupResetCmd(DISABLE);
mbed_official 130:1dec54e4aec3 52
mbed_official 240:9a7c54113eaf 53 // Enable LSE clock
mbed_official 240:9a7c54113eaf 54 RCC_LSEConfig(RCC_LSE_ON);
mbed_official 240:9a7c54113eaf 55
mbed_official 240:9a7c54113eaf 56 // Wait till LSE is ready
mbed_official 240:9a7c54113eaf 57 do {
mbed_official 240:9a7c54113eaf 58 LSEStatus = RCC_GetFlagStatus(RCC_FLAG_LSERDY);
mbed_official 240:9a7c54113eaf 59 wait_ms(1);
mbed_official 240:9a7c54113eaf 60 StartUpCounter++;
mbed_official 240:9a7c54113eaf 61 } while ((LSEStatus == 0) && (StartUpCounter <= LSE_STARTUP_TIMEOUT));
mbed_official 130:1dec54e4aec3 62
mbed_official 240:9a7c54113eaf 63 if (StartUpCounter > LSE_STARTUP_TIMEOUT) {
mbed_official 240:9a7c54113eaf 64 // The LSE has not started, use LSI instead.
mbed_official 240:9a7c54113eaf 65 // The RTC Clock may vary due to LSI frequency dispersion.
mbed_official 240:9a7c54113eaf 66 RCC_LSEConfig(RCC_LSE_OFF);
mbed_official 130:1dec54e4aec3 67 RCC_LSICmd(ENABLE); // Enable LSI
mbed_official 130:1dec54e4aec3 68 while (RCC_GetFlagStatus(RCC_FLAG_LSIRDY) == RESET) {} // Wait until ready
mbed_official 240:9a7c54113eaf 69 RCC_RTCCLKConfig(RCC_RTCCLKSource_LSI); // Select the RTC Clock Source
mbed_official 240:9a7c54113eaf 70 rtc_freq = 40000; // [TODO] To be measured precisely using a timer input capture
mbed_official 240:9a7c54113eaf 71 } else {
mbed_official 240:9a7c54113eaf 72 // The LSE has correctly started
mbed_official 240:9a7c54113eaf 73 RCC_RTCCLKConfig(RCC_RTCCLKSource_LSE); // Select the RTC Clock Source
mbed_official 240:9a7c54113eaf 74 rtc_freq = LSE_VALUE;
mbed_official 240:9a7c54113eaf 75 }
mbed_official 130:1dec54e4aec3 76
mbed_official 130:1dec54e4aec3 77 RCC_RTCCLKCmd(ENABLE); // Enable RTC Clock
mbed_official 130:1dec54e4aec3 78
mbed_official 130:1dec54e4aec3 79 RTC_WaitForSynchro(); // Wait for RTC registers synchronization
mbed_official 130:1dec54e4aec3 80
mbed_official 130:1dec54e4aec3 81 RTC_InitTypeDef RTC_InitStructure;
mbed_official 130:1dec54e4aec3 82 RTC_InitStructure.RTC_AsynchPrediv = 127;
mbed_official 240:9a7c54113eaf 83 RTC_InitStructure.RTC_SynchPrediv = (rtc_freq / 128) - 1;
mbed_official 130:1dec54e4aec3 84 RTC_InitStructure.RTC_HourFormat = RTC_HourFormat_24;
mbed_official 130:1dec54e4aec3 85 RTC_Init(&RTC_InitStructure);
mbed_official 130:1dec54e4aec3 86
mbed_official 240:9a7c54113eaf 87 PWR_BackupAccessCmd(DISABLE); // Disable access to Backup domain
mbed_official 130:1dec54e4aec3 88
mbed_official 130:1dec54e4aec3 89 rtc_inited = 1;
mbed_official 130:1dec54e4aec3 90 }
mbed_official 130:1dec54e4aec3 91
mbed_official 130:1dec54e4aec3 92 void rtc_free(void) {
mbed_official 240:9a7c54113eaf 93 // Reset RTC
mbed_official 240:9a7c54113eaf 94 PWR_BackupAccessCmd(ENABLE); // Enable access to Backup Domain
mbed_official 240:9a7c54113eaf 95 RTC_DeInit();
mbed_official 240:9a7c54113eaf 96 RCC_BackupResetCmd(ENABLE);
mbed_official 240:9a7c54113eaf 97 RCC_BackupResetCmd(DISABLE);
mbed_official 240:9a7c54113eaf 98 // Disable RTC, LSE and LSI clocks
mbed_official 240:9a7c54113eaf 99 RCC_RTCCLKCmd(DISABLE);
mbed_official 240:9a7c54113eaf 100 RCC_LSEConfig(RCC_LSE_OFF);
mbed_official 240:9a7c54113eaf 101 RCC_LSICmd(DISABLE);
mbed_official 240:9a7c54113eaf 102
mbed_official 130:1dec54e4aec3 103 rtc_inited = 0;
mbed_official 130:1dec54e4aec3 104 }
mbed_official 130:1dec54e4aec3 105
mbed_official 130:1dec54e4aec3 106 int rtc_isenabled(void) {
mbed_official 130:1dec54e4aec3 107 return rtc_inited;
mbed_official 130:1dec54e4aec3 108 }
mbed_official 130:1dec54e4aec3 109
mbed_official 130:1dec54e4aec3 110 /*
mbed_official 130:1dec54e4aec3 111 RTC Registers
mbed_official 130:1dec54e4aec3 112 RTC_WeekDay 1=monday, 2=tuesday, ..., 7=sunday
mbed_official 130:1dec54e4aec3 113 RTC_Month 1=january, 2=february, ..., 12=december
mbed_official 130:1dec54e4aec3 114 RTC_Date day of the month 1-31
mbed_official 130:1dec54e4aec3 115 RTC_Year year 0-99
mbed_official 130:1dec54e4aec3 116 struct tm
mbed_official 130:1dec54e4aec3 117 tm_sec seconds after the minute 0-61
mbed_official 130:1dec54e4aec3 118 tm_min minutes after the hour 0-59
mbed_official 130:1dec54e4aec3 119 tm_hour hours since midnight 0-23
mbed_official 130:1dec54e4aec3 120 tm_mday day of the month 1-31
mbed_official 130:1dec54e4aec3 121 tm_mon months since January 0-11
mbed_official 130:1dec54e4aec3 122 tm_year years since 1900
mbed_official 130:1dec54e4aec3 123 tm_wday days since Sunday 0-6
mbed_official 130:1dec54e4aec3 124 tm_yday days since January 1 0-365
mbed_official 130:1dec54e4aec3 125 tm_isdst Daylight Saving Time flag
mbed_official 130:1dec54e4aec3 126 */
mbed_official 130:1dec54e4aec3 127 time_t rtc_read(void) {
mbed_official 130:1dec54e4aec3 128 RTC_DateTypeDef dateStruct;
mbed_official 130:1dec54e4aec3 129 RTC_TimeTypeDef timeStruct;
mbed_official 130:1dec54e4aec3 130 struct tm timeinfo;
mbed_official 130:1dec54e4aec3 131
mbed_official 130:1dec54e4aec3 132 // Read actual date and time
mbed_official 130:1dec54e4aec3 133 RTC_GetTime(RTC_Format_BIN, &timeStruct);
mbed_official 130:1dec54e4aec3 134 RTC_GetDate(RTC_Format_BIN, &dateStruct);
mbed_official 130:1dec54e4aec3 135
mbed_official 130:1dec54e4aec3 136 // Setup a tm structure based on the RTC
mbed_official 130:1dec54e4aec3 137 timeinfo.tm_wday = dateStruct.RTC_WeekDay;
mbed_official 130:1dec54e4aec3 138 timeinfo.tm_mon = dateStruct.RTC_Month - 1;
mbed_official 130:1dec54e4aec3 139 timeinfo.tm_mday = dateStruct.RTC_Date;
mbed_official 130:1dec54e4aec3 140 timeinfo.tm_year = dateStruct.RTC_Year + 100;
mbed_official 130:1dec54e4aec3 141 timeinfo.tm_hour = timeStruct.RTC_Hours;
mbed_official 130:1dec54e4aec3 142 timeinfo.tm_min = timeStruct.RTC_Minutes;
mbed_official 130:1dec54e4aec3 143 timeinfo.tm_sec = timeStruct.RTC_Seconds;
mbed_official 130:1dec54e4aec3 144
mbed_official 130:1dec54e4aec3 145 // Convert to timestamp
mbed_official 130:1dec54e4aec3 146 time_t t = mktime(&timeinfo);
mbed_official 130:1dec54e4aec3 147
mbed_official 130:1dec54e4aec3 148 return t;
mbed_official 130:1dec54e4aec3 149 }
mbed_official 130:1dec54e4aec3 150
mbed_official 130:1dec54e4aec3 151 void rtc_write(time_t t) {
mbed_official 130:1dec54e4aec3 152 RTC_DateTypeDef dateStruct;
mbed_official 130:1dec54e4aec3 153 RTC_TimeTypeDef timeStruct;
mbed_official 130:1dec54e4aec3 154
mbed_official 130:1dec54e4aec3 155 // Convert the time into a tm
mbed_official 130:1dec54e4aec3 156 struct tm *timeinfo = localtime(&t);
mbed_official 130:1dec54e4aec3 157
mbed_official 130:1dec54e4aec3 158 // Fill RTC structures
mbed_official 130:1dec54e4aec3 159 dateStruct.RTC_WeekDay = timeinfo->tm_wday;
mbed_official 130:1dec54e4aec3 160 dateStruct.RTC_Month = timeinfo->tm_mon + 1;
mbed_official 130:1dec54e4aec3 161 dateStruct.RTC_Date = timeinfo->tm_mday;
mbed_official 130:1dec54e4aec3 162 dateStruct.RTC_Year = timeinfo->tm_year - 100;
mbed_official 130:1dec54e4aec3 163 timeStruct.RTC_Hours = timeinfo->tm_hour;
mbed_official 130:1dec54e4aec3 164 timeStruct.RTC_Minutes = timeinfo->tm_min;
mbed_official 130:1dec54e4aec3 165 timeStruct.RTC_Seconds = timeinfo->tm_sec;
mbed_official 130:1dec54e4aec3 166 timeStruct.RTC_H12 = RTC_HourFormat_24;
mbed_official 130:1dec54e4aec3 167
mbed_official 130:1dec54e4aec3 168 // Change the RTC current date/time
mbed_official 130:1dec54e4aec3 169 PWR_BackupAccessCmd(ENABLE); // Enable access to RTC
mbed_official 130:1dec54e4aec3 170 RTC_SetDate(RTC_Format_BIN, &dateStruct);
mbed_official 130:1dec54e4aec3 171 RTC_SetTime(RTC_Format_BIN, &timeStruct);
mbed_official 130:1dec54e4aec3 172 PWR_BackupAccessCmd(DISABLE); // Disable access to RTC
mbed_official 130:1dec54e4aec3 173 }
mbed_official 240:9a7c54113eaf 174
mbed_official 240:9a7c54113eaf 175 #endif