Lancaster University / mbed-src

Lancaster University's (short term!) clone of mbed-src for micro:bit. This is a copy of the github branch https://github.com/lancaster-university/mbed-classic

Fork of mbed-src by mbed official

targets/hal/TARGET_STM/TARGET_STM32F7/rtc_api.c@582:a89625bcd809, 2015-07-06 (annotated)

Committer:
mbed_official
Date:
Mon Jul 06 09:00:34 2015 +0100
Revision:
582:a89625bcd809
Parent:
573:ad23fe03a082 
Synchronized with git revision 45004fb61e4af8f74f4e916318df5207fcf6076d



Full URL: https://github.com/mbedmicro/mbed/commit/45004fb61e4af8f74f4e916318df5207fcf6076d/



DISCO_F746NG - Fix several issues

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 573:ad23fe03a082 1 /* mbed Microcontroller Library
mbed_official 573:ad23fe03a082 2 *******************************************************************************
mbed_official 573:ad23fe03a082 3 * Copyright (c) 2015, STMicroelectronics
mbed_official 573:ad23fe03a082 4 * All rights reserved.
mbed_official 573:ad23fe03a082 5 *
mbed_official 573:ad23fe03a082 6 * Redistribution and use in source and binary forms, with or without
mbed_official 573:ad23fe03a082 7 * modification, are permitted provided that the following conditions are met:
mbed_official 573:ad23fe03a082 8 *
mbed_official 573:ad23fe03a082 9 * 1. Redistributions of source code must retain the above copyright notice,
mbed_official 573:ad23fe03a082 10 * this list of conditions and the following disclaimer.
mbed_official 573:ad23fe03a082 11 * 2. Redistributions in binary form must reproduce the above copyright notice,
mbed_official 573:ad23fe03a082 12 * this list of conditions and the following disclaimer in the documentation
mbed_official 573:ad23fe03a082 13 * and/or other materials provided with the distribution.
mbed_official 573:ad23fe03a082 14 * 3. Neither the name of STMicroelectronics nor the names of its contributors
mbed_official 573:ad23fe03a082 15 * may be used to endorse or promote products derived from this software
mbed_official 573:ad23fe03a082 16 * without specific prior written permission.
mbed_official 573:ad23fe03a082 17 *
mbed_official 573:ad23fe03a082 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
mbed_official 573:ad23fe03a082 19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
mbed_official 573:ad23fe03a082 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
mbed_official 573:ad23fe03a082 21 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
mbed_official 573:ad23fe03a082 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
mbed_official 573:ad23fe03a082 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
mbed_official 573:ad23fe03a082 24 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
mbed_official 573:ad23fe03a082 25 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
mbed_official 573:ad23fe03a082 26 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
mbed_official 573:ad23fe03a082 27 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
mbed_official 573:ad23fe03a082 28 *******************************************************************************
mbed_official 573:ad23fe03a082 29 */
mbed_official 573:ad23fe03a082 30 #include "rtc_api.h"
mbed_official 573:ad23fe03a082 31
mbed_official 573:ad23fe03a082 32 #if DEVICE_RTC
mbed_official 573:ad23fe03a082 33
mbed_official 573:ad23fe03a082 34 #include "mbed_error.h"
mbed_official 573:ad23fe03a082 35
mbed_official 573:ad23fe03a082 36 static int rtc_inited = 0;
mbed_official 573:ad23fe03a082 37
mbed_official 573:ad23fe03a082 38 static RTC_HandleTypeDef RtcHandle;
mbed_official 573:ad23fe03a082 39
mbed_official 573:ad23fe03a082 40 void rtc_init(void)
mbed_official 573:ad23fe03a082 41 {
mbed_official 573:ad23fe03a082 42 RCC_OscInitTypeDef RCC_OscInitStruct;
mbed_official 573:ad23fe03a082 43 uint32_t rtc_freq = 0;
mbed_official 573:ad23fe03a082 44
mbed_official 573:ad23fe03a082 45 if (rtc_inited) return;
mbed_official 573:ad23fe03a082 46 rtc_inited = 1;
mbed_official 573:ad23fe03a082 47
mbed_official 573:ad23fe03a082 48 RtcHandle.Instance = RTC;
mbed_official 573:ad23fe03a082 49
mbed_official 573:ad23fe03a082 50 // Enable Power clock
mbed_official 573:ad23fe03a082 51 __PWR_CLK_ENABLE();
mbed_official 573:ad23fe03a082 52
mbed_official 573:ad23fe03a082 53 // Enable access to Backup domain
mbed_official 573:ad23fe03a082 54 HAL_PWR_EnableBkUpAccess();
mbed_official 573:ad23fe03a082 55
mbed_official 573:ad23fe03a082 56 // Reset Backup domain
mbed_official 573:ad23fe03a082 57 __HAL_RCC_BACKUPRESET_FORCE();
mbed_official 573:ad23fe03a082 58 __HAL_RCC_BACKUPRESET_RELEASE();
mbed_official 573:ad23fe03a082 59
mbed_official 573:ad23fe03a082 60 // Enable LSE Oscillator
mbed_official 573:ad23fe03a082 61 RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_LSE;
mbed_official 582:a89625bcd809 62 RCC_OscInitStruct.PLL.PLLState = RCC_PLL_NONE; // Mandatory, otherwise the PLL is reconfigured!
mbed_official 582:a89625bcd809 63 RCC_OscInitStruct.LSEState = RCC_LSE_ON; // External 32.768 kHz clock on OSC_IN/OSC_OUT
mbed_official 573:ad23fe03a082 64 if (HAL_RCC_OscConfig(&RCC_OscInitStruct) == HAL_OK) {
mbed_official 573:ad23fe03a082 65 // Connect LSE to RTC
mbed_official 573:ad23fe03a082 66 __HAL_RCC_RTC_CLKPRESCALER(RCC_RTCCLKSOURCE_LSE);
mbed_official 573:ad23fe03a082 67 __HAL_RCC_RTC_CONFIG(RCC_RTCCLKSOURCE_LSE);
mbed_official 573:ad23fe03a082 68 rtc_freq = LSE_VALUE;
mbed_official 573:ad23fe03a082 69 } else {
mbed_official 573:ad23fe03a082 70 // Enable LSI clock
mbed_official 573:ad23fe03a082 71 RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_LSI | RCC_OSCILLATORTYPE_LSE;
mbed_official 573:ad23fe03a082 72 RCC_OscInitStruct.PLL.PLLState = RCC_PLL_NONE; // Mandatory, otherwise the PLL is reconfigured!
mbed_official 573:ad23fe03a082 73 RCC_OscInitStruct.LSEState = RCC_LSE_OFF;
mbed_official 573:ad23fe03a082 74 RCC_OscInitStruct.LSIState = RCC_LSI_ON;
mbed_official 573:ad23fe03a082 75 if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK) {
mbed_official 573:ad23fe03a082 76 error("RTC error: LSI clock initialization failed.");
mbed_official 573:ad23fe03a082 77 }
mbed_official 573:ad23fe03a082 78 // Connect LSI to RTC
mbed_official 573:ad23fe03a082 79 __HAL_RCC_RTC_CLKPRESCALER(RCC_RTCCLKSOURCE_LSI);
mbed_official 573:ad23fe03a082 80 __HAL_RCC_RTC_CONFIG(RCC_RTCCLKSOURCE_LSI);
mbed_official 573:ad23fe03a082 81 // [TODO] This value is LSI typical value. To be measured precisely using a timer input capture
mbed_official 573:ad23fe03a082 82 rtc_freq = LSI_VALUE;
mbed_official 573:ad23fe03a082 83 }
mbed_official 573:ad23fe03a082 84
mbed_official 573:ad23fe03a082 85 // Enable RTC
mbed_official 573:ad23fe03a082 86 __HAL_RCC_RTC_ENABLE();
mbed_official 573:ad23fe03a082 87
mbed_official 573:ad23fe03a082 88 RtcHandle.Init.HourFormat = RTC_HOURFORMAT_24;
mbed_official 573:ad23fe03a082 89 RtcHandle.Init.AsynchPrediv = 127;
mbed_official 573:ad23fe03a082 90 RtcHandle.Init.SynchPrediv = (rtc_freq / 128) - 1;
mbed_official 573:ad23fe03a082 91 RtcHandle.Init.OutPut = RTC_OUTPUT_DISABLE;
mbed_official 573:ad23fe03a082 92 RtcHandle.Init.OutPutPolarity = RTC_OUTPUT_POLARITY_HIGH;
mbed_official 573:ad23fe03a082 93 RtcHandle.Init.OutPutType = RTC_OUTPUT_TYPE_OPENDRAIN;
mbed_official 573:ad23fe03a082 94
mbed_official 573:ad23fe03a082 95 if (HAL_RTC_Init(&RtcHandle) != HAL_OK) {
mbed_official 573:ad23fe03a082 96 error("RTC error: RTC initialization failed.");
mbed_official 573:ad23fe03a082 97 }
mbed_official 573:ad23fe03a082 98 }
mbed_official 573:ad23fe03a082 99
mbed_official 573:ad23fe03a082 100 void rtc_free(void)
mbed_official 573:ad23fe03a082 101 {
mbed_official 573:ad23fe03a082 102 // Enable Power clock
mbed_official 573:ad23fe03a082 103 __PWR_CLK_ENABLE();
mbed_official 573:ad23fe03a082 104
mbed_official 573:ad23fe03a082 105 // Enable access to Backup domain
mbed_official 573:ad23fe03a082 106 HAL_PWR_EnableBkUpAccess();
mbed_official 573:ad23fe03a082 107
mbed_official 573:ad23fe03a082 108 // Reset Backup domain
mbed_official 573:ad23fe03a082 109 __HAL_RCC_BACKUPRESET_FORCE();
mbed_official 573:ad23fe03a082 110 __HAL_RCC_BACKUPRESET_RELEASE();
mbed_official 573:ad23fe03a082 111
mbed_official 573:ad23fe03a082 112 // Disable access to Backup domain
mbed_official 573:ad23fe03a082 113 HAL_PWR_DisableBkUpAccess();
mbed_official 573:ad23fe03a082 114
mbed_official 573:ad23fe03a082 115 // Disable LSI and LSE clocks
mbed_official 573:ad23fe03a082 116 RCC_OscInitTypeDef RCC_OscInitStruct;
mbed_official 573:ad23fe03a082 117 RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_LSI | RCC_OSCILLATORTYPE_LSE;
mbed_official 573:ad23fe03a082 118 RCC_OscInitStruct.PLL.PLLState = RCC_PLL_NONE;
mbed_official 573:ad23fe03a082 119 RCC_OscInitStruct.LSIState = RCC_LSI_OFF;
mbed_official 573:ad23fe03a082 120 RCC_OscInitStruct.LSEState = RCC_LSE_OFF;
mbed_official 573:ad23fe03a082 121 HAL_RCC_OscConfig(&RCC_OscInitStruct);
mbed_official 573:ad23fe03a082 122
mbed_official 573:ad23fe03a082 123 rtc_inited = 0;
mbed_official 573:ad23fe03a082 124 }
mbed_official 573:ad23fe03a082 125
mbed_official 573:ad23fe03a082 126 int rtc_isenabled(void)
mbed_official 573:ad23fe03a082 127 {
mbed_official 573:ad23fe03a082 128 return rtc_inited;
mbed_official 573:ad23fe03a082 129 }
mbed_official 573:ad23fe03a082 130
mbed_official 573:ad23fe03a082 131 /*
mbed_official 573:ad23fe03a082 132 RTC Registers
mbed_official 573:ad23fe03a082 133 RTC_WeekDay 1=monday, 2=tuesday, ..., 7=sunday
mbed_official 573:ad23fe03a082 134 RTC_Month 1=january, 2=february, ..., 12=december
mbed_official 573:ad23fe03a082 135 RTC_Date day of the month 1-31
mbed_official 573:ad23fe03a082 136 RTC_Year year 0-99
mbed_official 573:ad23fe03a082 137 struct tm
mbed_official 573:ad23fe03a082 138 tm_sec seconds after the minute 0-61
mbed_official 573:ad23fe03a082 139 tm_min minutes after the hour 0-59
mbed_official 573:ad23fe03a082 140 tm_hour hours since midnight 0-23
mbed_official 573:ad23fe03a082 141 tm_mday day of the month 1-31
mbed_official 573:ad23fe03a082 142 tm_mon months since January 0-11
mbed_official 573:ad23fe03a082 143 tm_year years since 1900
mbed_official 573:ad23fe03a082 144 tm_wday days since Sunday 0-6
mbed_official 573:ad23fe03a082 145 tm_yday days since January 1 0-365
mbed_official 573:ad23fe03a082 146 tm_isdst Daylight Saving Time flag
mbed_official 573:ad23fe03a082 147 */
mbed_official 573:ad23fe03a082 148 time_t rtc_read(void)
mbed_official 573:ad23fe03a082 149 {
mbed_official 573:ad23fe03a082 150 RTC_DateTypeDef dateStruct;
mbed_official 573:ad23fe03a082 151 RTC_TimeTypeDef timeStruct;
mbed_official 573:ad23fe03a082 152 struct tm timeinfo;
mbed_official 573:ad23fe03a082 153
mbed_official 573:ad23fe03a082 154 RtcHandle.Instance = RTC;
mbed_official 573:ad23fe03a082 155
mbed_official 573:ad23fe03a082 156 // Read actual date and time
mbed_official 573:ad23fe03a082 157 // Warning: the time must be read first!
mbed_official 573:ad23fe03a082 158 HAL_RTC_GetTime(&RtcHandle, &timeStruct, FORMAT_BIN);
mbed_official 573:ad23fe03a082 159 HAL_RTC_GetDate(&RtcHandle, &dateStruct, FORMAT_BIN);
mbed_official 573:ad23fe03a082 160
mbed_official 573:ad23fe03a082 161 // Setup a tm structure based on the RTC
mbed_official 573:ad23fe03a082 162 timeinfo.tm_wday = dateStruct.WeekDay;
mbed_official 573:ad23fe03a082 163 timeinfo.tm_mon = dateStruct.Month - 1;
mbed_official 573:ad23fe03a082 164 timeinfo.tm_mday = dateStruct.Date;
mbed_official 573:ad23fe03a082 165 timeinfo.tm_year = dateStruct.Year + 100;
mbed_official 573:ad23fe03a082 166 timeinfo.tm_hour = timeStruct.Hours;
mbed_official 573:ad23fe03a082 167 timeinfo.tm_min = timeStruct.Minutes;
mbed_official 573:ad23fe03a082 168 timeinfo.tm_sec = timeStruct.Seconds;
mbed_official 573:ad23fe03a082 169
mbed_official 573:ad23fe03a082 170 // Convert to timestamp
mbed_official 573:ad23fe03a082 171 time_t t = mktime(&timeinfo);
mbed_official 573:ad23fe03a082 172
mbed_official 573:ad23fe03a082 173 return t;
mbed_official 573:ad23fe03a082 174 }
mbed_official 573:ad23fe03a082 175
mbed_official 573:ad23fe03a082 176 void rtc_write(time_t t)
mbed_official 573:ad23fe03a082 177 {
mbed_official 573:ad23fe03a082 178 RTC_DateTypeDef dateStruct;
mbed_official 573:ad23fe03a082 179 RTC_TimeTypeDef timeStruct;
mbed_official 573:ad23fe03a082 180
mbed_official 573:ad23fe03a082 181 RtcHandle.Instance = RTC;
mbed_official 573:ad23fe03a082 182
mbed_official 573:ad23fe03a082 183 // Convert the time into a tm
mbed_official 573:ad23fe03a082 184 struct tm *timeinfo = localtime(&t);
mbed_official 573:ad23fe03a082 185
mbed_official 573:ad23fe03a082 186 // Fill RTC structures
mbed_official 573:ad23fe03a082 187 dateStruct.WeekDay = timeinfo->tm_wday;
mbed_official 573:ad23fe03a082 188 dateStruct.Month = timeinfo->tm_mon + 1;
mbed_official 573:ad23fe03a082 189 dateStruct.Date = timeinfo->tm_mday;
mbed_official 573:ad23fe03a082 190 dateStruct.Year = timeinfo->tm_year - 100;
mbed_official 573:ad23fe03a082 191 timeStruct.Hours = timeinfo->tm_hour;
mbed_official 573:ad23fe03a082 192 timeStruct.Minutes = timeinfo->tm_min;
mbed_official 573:ad23fe03a082 193 timeStruct.Seconds = timeinfo->tm_sec;
mbed_official 573:ad23fe03a082 194 timeStruct.TimeFormat = RTC_HOURFORMAT12_PM;
mbed_official 573:ad23fe03a082 195 timeStruct.DayLightSaving = RTC_DAYLIGHTSAVING_NONE;
mbed_official 573:ad23fe03a082 196 timeStruct.StoreOperation = RTC_STOREOPERATION_RESET;
mbed_official 573:ad23fe03a082 197
mbed_official 573:ad23fe03a082 198 // Change the RTC current date/time
mbed_official 573:ad23fe03a082 199 HAL_RTC_SetDate(&RtcHandle, &dateStruct, FORMAT_BIN);
mbed_official 573:ad23fe03a082 200 HAL_RTC_SetTime(&RtcHandle, &timeStruct, FORMAT_BIN);
mbed_official 573:ad23fe03a082 201 }
mbed_official 573:ad23fe03a082 202
mbed_official 573:ad23fe03a082 203 #endif