Lee Kai Xuan / mbed-os

mbed-os

Fork of mbed-os by erkin yucel

targets/TARGET_STM/TARGET_STM32F0/rtc_api.c@1:3deb71413561, 2017-07-20 (annotated)

Committer:
xuaner
Date:
Thu Jul 20 14:26:57 2017 +0000
Revision:
1:3deb71413561
Parent:
0:f269e3021894 
mbed_os

Who changed what in which revision?

UserRevisionLine numberNew contents of line
elessair 0:f269e3021894 1 /* mbed Microcontroller Library
elessair 0:f269e3021894 2 *******************************************************************************
elessair 0:f269e3021894 3 * Copyright (c) 2016, STMicroelectronics
elessair 0:f269e3021894 4 * All rights reserved.
elessair 0:f269e3021894 5 *
elessair 0:f269e3021894 6 * Redistribution and use in source and binary forms, with or without
elessair 0:f269e3021894 7 * modification, are permitted provided that the following conditions are met:
elessair 0:f269e3021894 8 *
elessair 0:f269e3021894 9 * 1. Redistributions of source code must retain the above copyright notice,
elessair 0:f269e3021894 10 * this list of conditions and the following disclaimer.
elessair 0:f269e3021894 11 * 2. Redistributions in binary form must reproduce the above copyright notice,
elessair 0:f269e3021894 12 * this list of conditions and the following disclaimer in the documentation
elessair 0:f269e3021894 13 * and/or other materials provided with the distribution.
elessair 0:f269e3021894 14 * 3. Neither the name of STMicroelectronics nor the names of its contributors
elessair 0:f269e3021894 15 * may be used to endorse or promote products derived from this software
elessair 0:f269e3021894 16 * without specific prior written permission.
elessair 0:f269e3021894 17 *
elessair 0:f269e3021894 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
elessair 0:f269e3021894 19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
elessair 0:f269e3021894 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
elessair 0:f269e3021894 21 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
elessair 0:f269e3021894 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
elessair 0:f269e3021894 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
elessair 0:f269e3021894 24 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
elessair 0:f269e3021894 25 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
elessair 0:f269e3021894 26 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
elessair 0:f269e3021894 27 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
elessair 0:f269e3021894 28 *******************************************************************************
elessair 0:f269e3021894 29 */
elessair 0:f269e3021894 30 #include "rtc_api.h"
elessair 0:f269e3021894 31 #include "rtc_api_hal.h"
elessair 0:f269e3021894 32
elessair 0:f269e3021894 33 #if DEVICE_RTC
elessair 0:f269e3021894 34
elessair 0:f269e3021894 35 #include "mbed_error.h"
elessair 0:f269e3021894 36
elessair 0:f269e3021894 37 #if RTC_LSI
elessair 0:f269e3021894 38 static int rtc_inited = 0;
elessair 0:f269e3021894 39 #endif
elessair 0:f269e3021894 40
elessair 0:f269e3021894 41 static RTC_HandleTypeDef RtcHandle;
elessair 0:f269e3021894 42
elessair 0:f269e3021894 43 #if RTC_LSI
elessair 0:f269e3021894 44 #define RTC_CLOCK LSI_VALUE
elessair 0:f269e3021894 45 #else
elessair 0:f269e3021894 46 #define RTC_CLOCK LSE_VALUE
elessair 0:f269e3021894 47 #endif
elessair 0:f269e3021894 48
elessair 0:f269e3021894 49 #if DEVICE_LOWPOWERTIMER
elessair 0:f269e3021894 50 #define RTC_ASYNCH_PREDIV ((RTC_CLOCK - 1) / 0x8000)
elessair 0:f269e3021894 51 #define RTC_SYNCH_PREDIV (RTC_CLOCK / (RTC_ASYNCH_PREDIV + 1) - 1)
elessair 0:f269e3021894 52 #else
elessair 0:f269e3021894 53 #define RTC_ASYNCH_PREDIV (0x007F)
elessair 0:f269e3021894 54 #define RTC_SYNCH_PREDIV (RTC_CLOCK / (RTC_ASYNCH_PREDIV + 1) - 1)
elessair 0:f269e3021894 55 #endif
elessair 0:f269e3021894 56
elessair 0:f269e3021894 57 #if DEVICE_LOWPOWERTIMER
elessair 0:f269e3021894 58 static void (*irq_handler)(void);
elessair 0:f269e3021894 59 static void RTC_IRQHandler(void);
elessair 0:f269e3021894 60 #endif
elessair 0:f269e3021894 61
elessair 0:f269e3021894 62 void rtc_init(void) {
elessair 0:f269e3021894 63 RCC_OscInitTypeDef RCC_OscInitStruct;
elessair 0:f269e3021894 64
elessair 0:f269e3021894 65 #if RTC_LSI
elessair 0:f269e3021894 66 if (rtc_inited) return;
elessair 0:f269e3021894 67 rtc_inited = 1;
elessair 0:f269e3021894 68 #endif
elessair 0:f269e3021894 69
elessair 0:f269e3021894 70 RtcHandle.Instance = RTC;
elessair 0:f269e3021894 71
elessair 0:f269e3021894 72 #if !RTC_LSI
elessair 0:f269e3021894 73 // Enable LSE Oscillator
elessair 0:f269e3021894 74 RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_LSE;
elessair 0:f269e3021894 75 RCC_OscInitStruct.PLL.PLLState = RCC_PLL_NONE; // Mandatory, otherwise the PLL is reconfigured!
elessair 0:f269e3021894 76 RCC_OscInitStruct.LSEState = RCC_LSE_ON; // External 32.768 kHz clock on OSC_IN/OSC_OUT
elessair 0:f269e3021894 77 RCC_OscInitStruct.LSIState = RCC_LSI_OFF;
elessair 0:f269e3021894 78 if (HAL_RCC_OscConfig(&RCC_OscInitStruct) == HAL_OK) { // Check if LSE has started correctly
elessair 0:f269e3021894 79 // Connect LSE to RTC
elessair 0:f269e3021894 80 __HAL_RCC_RTC_CONFIG(RCC_RTCCLKSOURCE_LSE);
elessair 0:f269e3021894 81 } else {
elessair 0:f269e3021894 82 error("Cannot initialize RTC with LSE\n");
elessair 0:f269e3021894 83 }
elessair 0:f269e3021894 84 #else
elessair 0:f269e3021894 85 // Enable Power clock
elessair 0:f269e3021894 86 __PWR_CLK_ENABLE();
elessair 0:f269e3021894 87
elessair 0:f269e3021894 88 // Enable access to Backup domain
elessair 0:f269e3021894 89 HAL_PWR_EnableBkUpAccess();
elessair 0:f269e3021894 90
elessair 0:f269e3021894 91 // Reset Backup domain
elessair 0:f269e3021894 92 __HAL_RCC_BACKUPRESET_FORCE();
elessair 0:f269e3021894 93 __HAL_RCC_BACKUPRESET_RELEASE();
elessair 0:f269e3021894 94
elessair 0:f269e3021894 95 // Enable LSI clock
elessair 0:f269e3021894 96 RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_LSI | RCC_OSCILLATORTYPE_LSE;
elessair 0:f269e3021894 97 RCC_OscInitStruct.PLL.PLLState = RCC_PLL_NONE; // Mandatory, otherwise the PLL is reconfigured!
elessair 0:f269e3021894 98 RCC_OscInitStruct.LSEState = RCC_LSE_OFF;
elessair 0:f269e3021894 99 RCC_OscInitStruct.LSIState = RCC_LSI_ON;
elessair 0:f269e3021894 100 if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK) {
elessair 0:f269e3021894 101 error("Cannot initialize RTC with LSI\n");
elessair 0:f269e3021894 102 }
elessair 0:f269e3021894 103 // Connect LSI to RTC
elessair 0:f269e3021894 104 __HAL_RCC_RTC_CONFIG(RCC_RTCCLKSOURCE_LSI);
elessair 0:f269e3021894 105 #endif
elessair 0:f269e3021894 106
elessair 0:f269e3021894 107 // Enable RTC
elessair 0:f269e3021894 108 __HAL_RCC_RTC_ENABLE();
elessair 0:f269e3021894 109
elessair 0:f269e3021894 110 RtcHandle.Init.HourFormat = RTC_HOURFORMAT_24;
elessair 0:f269e3021894 111 RtcHandle.Init.AsynchPrediv = RTC_ASYNCH_PREDIV;
elessair 0:f269e3021894 112 RtcHandle.Init.SynchPrediv = RTC_SYNCH_PREDIV;
elessair 0:f269e3021894 113 RtcHandle.Init.OutPut = RTC_OUTPUT_DISABLE;
elessair 0:f269e3021894 114 RtcHandle.Init.OutPutPolarity = RTC_OUTPUT_POLARITY_HIGH;
elessair 0:f269e3021894 115 RtcHandle.Init.OutPutType = RTC_OUTPUT_TYPE_OPENDRAIN;
elessair 0:f269e3021894 116
elessair 0:f269e3021894 117 if (HAL_RTC_Init(&RtcHandle) != HAL_OK) {
elessair 0:f269e3021894 118 error("RTC error: RTC initialization failed.");
elessair 0:f269e3021894 119 }
elessair 0:f269e3021894 120
elessair 0:f269e3021894 121 #if DEVICE_LOWPOWERTIMER
elessair 0:f269e3021894 122 #if RTC_LSI
elessair 0:f269e3021894 123 rtc_write(0);
elessair 0:f269e3021894 124 #else
elessair 0:f269e3021894 125 if (!rtc_isenabled()) {
elessair 0:f269e3021894 126 rtc_write(0);
elessair 0:f269e3021894 127 }
elessair 0:f269e3021894 128 #endif
elessair 0:f269e3021894 129 NVIC_ClearPendingIRQ(RTC_IRQn);
elessair 0:f269e3021894 130 NVIC_DisableIRQ(RTC_IRQn);
elessair 0:f269e3021894 131 NVIC_SetVector(RTC_IRQn, (uint32_t)RTC_IRQHandler);
elessair 0:f269e3021894 132 NVIC_EnableIRQ(RTC_IRQn);
elessair 0:f269e3021894 133 #endif
elessair 0:f269e3021894 134 }
elessair 0:f269e3021894 135
elessair 0:f269e3021894 136 void rtc_free(void) {
elessair 0:f269e3021894 137 #if RTC_LSI
elessair 0:f269e3021894 138 // Enable Power clock
elessair 0:f269e3021894 139 __PWR_CLK_ENABLE();
elessair 0:f269e3021894 140
elessair 0:f269e3021894 141 // Enable access to Backup domain
elessair 0:f269e3021894 142 HAL_PWR_EnableBkUpAccess();
elessair 0:f269e3021894 143
elessair 0:f269e3021894 144 // Reset Backup domain
elessair 0:f269e3021894 145 __HAL_RCC_BACKUPRESET_FORCE();
elessair 0:f269e3021894 146 __HAL_RCC_BACKUPRESET_RELEASE();
elessair 0:f269e3021894 147
elessair 0:f269e3021894 148 // Disable access to Backup domain
elessair 0:f269e3021894 149 HAL_PWR_DisableBkUpAccess();
elessair 0:f269e3021894 150 #endif
elessair 0:f269e3021894 151
elessair 0:f269e3021894 152 // Disable LSI and LSE clocks
elessair 0:f269e3021894 153 RCC_OscInitTypeDef RCC_OscInitStruct;
elessair 0:f269e3021894 154 RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_LSI | RCC_OSCILLATORTYPE_LSE;
elessair 0:f269e3021894 155 RCC_OscInitStruct.PLL.PLLState = RCC_PLL_NONE;
elessair 0:f269e3021894 156 RCC_OscInitStruct.LSIState = RCC_LSI_OFF;
elessair 0:f269e3021894 157 RCC_OscInitStruct.LSEState = RCC_LSE_OFF;
elessair 0:f269e3021894 158 HAL_RCC_OscConfig(&RCC_OscInitStruct);
elessair 0:f269e3021894 159
elessair 0:f269e3021894 160 #if RTC_LSI
elessair 0:f269e3021894 161 rtc_inited = 0;
elessair 0:f269e3021894 162 #endif
elessair 0:f269e3021894 163 }
elessair 0:f269e3021894 164
elessair 0:f269e3021894 165 int rtc_isenabled(void) {
elessair 0:f269e3021894 166 #if RTC_LSI
elessair 0:f269e3021894 167 return rtc_inited;
elessair 0:f269e3021894 168 #else
elessair 0:f269e3021894 169 if ((RTC->ISR & RTC_ISR_INITS) == RTC_ISR_INITS) {
elessair 0:f269e3021894 170 return 1;
elessair 0:f269e3021894 171 } else {
elessair 0:f269e3021894 172 return 0;
elessair 0:f269e3021894 173 }
elessair 0:f269e3021894 174 #endif
elessair 0:f269e3021894 175 }
elessair 0:f269e3021894 176
elessair 0:f269e3021894 177 /*
elessair 0:f269e3021894 178 RTC Registers
elessair 0:f269e3021894 179 RTC_WeekDay 1=monday, 2=tuesday, ..., 7=sunday
elessair 0:f269e3021894 180 RTC_Month 1=january, 2=february, ..., 12=december
elessair 0:f269e3021894 181 RTC_Date day of the month 1-31
elessair 0:f269e3021894 182 RTC_Year year 0-99
elessair 0:f269e3021894 183 struct tm
elessair 0:f269e3021894 184 tm_sec seconds after the minute 0-61
elessair 0:f269e3021894 185 tm_min minutes after the hour 0-59
elessair 0:f269e3021894 186 tm_hour hours since midnight 0-23
elessair 0:f269e3021894 187 tm_mday day of the month 1-31
elessair 0:f269e3021894 188 tm_mon months since January 0-11
elessair 0:f269e3021894 189 tm_year years since 1900
elessair 0:f269e3021894 190 tm_wday days since Sunday 0-6
elessair 0:f269e3021894 191 tm_yday days since January 1 0-365
elessair 0:f269e3021894 192 tm_isdst Daylight Saving Time flag
elessair 0:f269e3021894 193 */
elessair 0:f269e3021894 194 time_t rtc_read(void) {
elessair 0:f269e3021894 195 RTC_DateTypeDef dateStruct;
elessair 0:f269e3021894 196 RTC_TimeTypeDef timeStruct;
elessair 0:f269e3021894 197 struct tm timeinfo;
elessair 0:f269e3021894 198
elessair 0:f269e3021894 199 RtcHandle.Instance = RTC;
elessair 0:f269e3021894 200
elessair 0:f269e3021894 201 // Read actual date and time
elessair 0:f269e3021894 202 // Warning: the time must be read first!
elessair 0:f269e3021894 203 HAL_RTC_GetTime(&RtcHandle, &timeStruct, FORMAT_BIN);
elessair 0:f269e3021894 204 HAL_RTC_GetDate(&RtcHandle, &dateStruct, FORMAT_BIN);
elessair 0:f269e3021894 205
elessair 0:f269e3021894 206 // Setup a tm structure based on the RTC
elessair 0:f269e3021894 207 timeinfo.tm_wday = dateStruct.WeekDay;
elessair 0:f269e3021894 208 timeinfo.tm_mon = dateStruct.Month - 1;
elessair 0:f269e3021894 209 timeinfo.tm_mday = dateStruct.Date;
elessair 0:f269e3021894 210 timeinfo.tm_year = dateStruct.Year + 68;
elessair 0:f269e3021894 211 timeinfo.tm_hour = timeStruct.Hours;
elessair 0:f269e3021894 212 timeinfo.tm_min = timeStruct.Minutes;
elessair 0:f269e3021894 213 timeinfo.tm_sec = timeStruct.Seconds;
elessair 0:f269e3021894 214 timeinfo.tm_isdst = -1;
elessair 0:f269e3021894 215
elessair 0:f269e3021894 216 // Convert to timestamp
elessair 0:f269e3021894 217 time_t t = mktime(&timeinfo);
elessair 0:f269e3021894 218
elessair 0:f269e3021894 219 return t;
elessair 0:f269e3021894 220 }
elessair 0:f269e3021894 221
elessair 0:f269e3021894 222 void rtc_write(time_t t) {
elessair 0:f269e3021894 223 RTC_DateTypeDef dateStruct;
elessair 0:f269e3021894 224 RTC_TimeTypeDef timeStruct;
elessair 0:f269e3021894 225
elessair 0:f269e3021894 226 RtcHandle.Instance = RTC;
elessair 0:f269e3021894 227
elessair 0:f269e3021894 228 // Convert the time into a tm
elessair 0:f269e3021894 229 struct tm *timeinfo = localtime(&t);
elessair 0:f269e3021894 230
elessair 0:f269e3021894 231 // Fill RTC structures
elessair 0:f269e3021894 232 dateStruct.WeekDay = timeinfo->tm_wday;
elessair 0:f269e3021894 233 dateStruct.Month = timeinfo->tm_mon + 1;
elessair 0:f269e3021894 234 dateStruct.Date = timeinfo->tm_mday;
elessair 0:f269e3021894 235 dateStruct.Year = timeinfo->tm_year - 68;
elessair 0:f269e3021894 236 timeStruct.Hours = timeinfo->tm_hour;
elessair 0:f269e3021894 237 timeStruct.Minutes = timeinfo->tm_min;
elessair 0:f269e3021894 238 timeStruct.Seconds = timeinfo->tm_sec;
elessair 0:f269e3021894 239 timeStruct.TimeFormat = RTC_HOURFORMAT_24;
elessair 0:f269e3021894 240 timeStruct.DayLightSaving = RTC_DAYLIGHTSAVING_NONE;
elessair 0:f269e3021894 241 timeStruct.StoreOperation = RTC_STOREOPERATION_RESET;
elessair 0:f269e3021894 242
elessair 0:f269e3021894 243 // Change the RTC current date/time
elessair 0:f269e3021894 244 HAL_RTC_SetDate(&RtcHandle, &dateStruct, FORMAT_BIN);
elessair 0:f269e3021894 245 HAL_RTC_SetTime(&RtcHandle, &timeStruct, FORMAT_BIN);
elessair 0:f269e3021894 246 }
elessair 0:f269e3021894 247
elessair 0:f269e3021894 248 #if DEVICE_LOWPOWERTIMER
elessair 0:f269e3021894 249
elessair 0:f269e3021894 250 static void RTC_IRQHandler(void)
elessair 0:f269e3021894 251 {
elessair 0:f269e3021894 252 HAL_RTCEx_WakeUpTimerIRQHandler(&RtcHandle);
elessair 0:f269e3021894 253 }
elessair 0:f269e3021894 254
elessair 0:f269e3021894 255 void HAL_RTCEx_WakeUpTimerEventCallback(RTC_HandleTypeDef *hrtc)
elessair 0:f269e3021894 256 {
elessair 0:f269e3021894 257 if (irq_handler) {
elessair 0:f269e3021894 258 // Fire the user callback
elessair 0:f269e3021894 259 irq_handler();
elessair 0:f269e3021894 260 }
elessair 0:f269e3021894 261 }
elessair 0:f269e3021894 262
elessair 0:f269e3021894 263 void rtc_set_irq_handler(uint32_t handler)
elessair 0:f269e3021894 264 {
elessair 0:f269e3021894 265 irq_handler = (void (*)(void))handler;
elessair 0:f269e3021894 266 }
elessair 0:f269e3021894 267
elessair 0:f269e3021894 268 uint32_t rtc_read_subseconds(void)
elessair 0:f269e3021894 269 {
elessair 0:f269e3021894 270 return 1000000.f * ((double)(RTC_SYNCH_PREDIV - RTC->SSR) / (RTC_SYNCH_PREDIV + 1));
elessair 0:f269e3021894 271 }
elessair 0:f269e3021894 272
elessair 0:f269e3021894 273 void rtc_set_wake_up_timer(uint32_t delta)
elessair 0:f269e3021894 274 {
elessair 0:f269e3021894 275 uint32_t wake_up_counter = delta / (2000000 / RTC_CLOCK);
elessair 0:f269e3021894 276
elessair 0:f269e3021894 277 if (HAL_RTCEx_SetWakeUpTimer_IT(&RtcHandle, wake_up_counter,
elessair 0:f269e3021894 278 RTC_WAKEUPCLOCK_RTCCLK_DIV2) != HAL_OK) {
elessair 0:f269e3021894 279 error("Set wake up timer failed\n");
elessair 0:f269e3021894 280 }
elessair 0:f269e3021894 281 }
elessair 0:f269e3021894 282
elessair 0:f269e3021894 283 void rtc_deactivate_wake_up_timer(void)
elessair 0:f269e3021894 284 {
elessair 0:f269e3021894 285 HAL_RTCEx_DeactivateWakeUpTimer(&RtcHandle);
elessair 0:f269e3021894 286 }
elessair 0:f269e3021894 287
elessair 0:f269e3021894 288 void rtc_synchronize(void)
elessair 0:f269e3021894 289 {
elessair 0:f269e3021894 290 HAL_RTC_WaitForSynchro(&RtcHandle);
elessair 0:f269e3021894 291 }
elessair 0:f269e3021894 292 #endif // DEVICE_LOWPOWERTIMER
elessair 0:f269e3021894 293
elessair 0:f269e3021894 294 #endif