This is a RTC additional function. This is only for Nucleo F401RE & F411RE mbed(Added L152RE, F334R8, L476RG & F746xx). If you connected battery backup circuit for internal RTC, you can make a power-off and reset condition. RTC still has proper time and date.
Dependents: Nucleo_rtos_sample PB_Emma_Ethernet
Please refer following NOTE information.
/users/kenjiArai/notebook/nucleo-series-rtc-control-under-power-onoff-and-re/
Diff: rtc_api_F4xx.c
- Revision:
- 1:3129de8d50ea
diff -r e4c20fd769f1 -r 3129de8d50ea rtc_api_F4xx.c --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/rtc_api_F4xx.c Sat Feb 14 11:31:51 2015 +0000 @@ -0,0 +1,277 @@ +#if 0 +/* mbed Microcontroller Library + ******************************************************************************* + * Copyright (c) 2014, STMicroelectronics + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are met: + * + * 1. Redistributions of source code must retain the above copyright notice, + * this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright notice, + * this list of conditions and the following disclaimer in the documentation + * and/or other materials provided with the distribution. + * 3. Neither the name of STMicroelectronics nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" + * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE + * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR + * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER + * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, + * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + ******************************************************************************* + */ +#include "rtc_api.h" + +#if DEVICE_RTC + +#include "mbed_error.h" + +static int rtc_inited = 0; + +static RTC_HandleTypeDef RtcHandle; + +//#define ORIGINAL +#if defined(ORIGINAL) +#warning "You cannot use SetRTC functions" +#else +#warning "You modified mbed-src rtc_api.c for SetRTC functions" +#endif + +#if defined(ORIGINAL) // modify part1 of 4 (Start) +#else +#define RTC_DAT0 0x55aa55aa +#define RTC_DAT1 0xaa55aa55 + +uint32_t RTC_ReadBackupRegister(uint32_t RTC_BKP_DR){ + __IO uint32_t tmp = 0; + + // Check the parameters + assert_param(IS_RTC_BKP(RTC_BKP_DR)); + tmp = RTC_BASE + 0x50; + tmp += (RTC_BKP_DR * 4); + // Read the specified register + return (*(__IO uint32_t *)tmp); +} + +/* Check RTC Backup registers contents */ +uint32_t Check_Rtc_backup_reg( void ){ + if ( RTC_ReadBackupRegister( RTC_BKP_DR0 ) == RTC_DAT0 ){ + if ( RTC_ReadBackupRegister( RTC_BKP_DR1 ) == RTC_DAT1 ){ + return 1; + } + } + return 0; +} + +void RTC_WriteBackupRegister(uint32_t RTC_BKP_DR, uint32_t Data){ + __IO uint32_t tmp = 0; + + // Check the parameters/ + assert_param(IS_RTC_BKP(RTC_BKP_DR)); + tmp = RTC_BASE + 0x50; + tmp += (RTC_BKP_DR * 4); + // Write the specified register/ + *(__IO uint32_t *)tmp = (uint32_t)Data; +} +#endif // modify part1 of 4 (End) + +void rtc_init(void) +{ + RCC_OscInitTypeDef RCC_OscInitStruct; + uint32_t rtc_freq = 0; + +#if defined(ORIGINAL) // modify part2 of 4 (Start) + if (rtc_inited) return; + rtc_inited = 1; + + RtcHandle.Instance = RTC; + + // Enable Power clock + __PWR_CLK_ENABLE(); + + // Enable access to Backup domain + HAL_PWR_EnableBkUpAccess(); +#else + RtcHandle.Instance = RTC; + + // Enable Power clock + __PWR_CLK_ENABLE(); + + // Enable access to Backup domain + HAL_PWR_EnableBkUpAccess(); + + // Check backup condition + if ( Check_Rtc_backup_reg() ){ + return; + } +#endif // modify part2 of 4 (End) + + // Reset Backup domain + __HAL_RCC_BACKUPRESET_FORCE(); + __HAL_RCC_BACKUPRESET_RELEASE(); + + // Enable LSE Oscillator + RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_LSE; + RCC_OscInitStruct.PLL.PLLState = RCC_PLL_NONE; /* Mandatory, otherwise the PLL is reconfigured! */ + RCC_OscInitStruct.LSEState = RCC_LSE_ON; /* External 32.768 kHz clock on OSC_IN/OSC_OUT */ + if (HAL_RCC_OscConfig(&RCC_OscInitStruct) == HAL_OK) { + // Connect LSE to RTC + __HAL_RCC_RTC_CLKPRESCALER(RCC_RTCCLKSOURCE_LSE); + __HAL_RCC_RTC_CONFIG(RCC_RTCCLKSOURCE_LSE); + rtc_freq = LSE_VALUE; + } else { + // Enable LSI clock + RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_LSI | RCC_OSCILLATORTYPE_LSE; + RCC_OscInitStruct.PLL.PLLState = RCC_PLL_NONE; // Mandatory, otherwise the PLL is reconfigured! + RCC_OscInitStruct.LSEState = RCC_LSE_OFF; + RCC_OscInitStruct.LSIState = RCC_LSI_ON; + if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK) { + error("RTC error: LSI clock initialization failed."); + } + // Connect LSI to RTC + __HAL_RCC_RTC_CLKPRESCALER(RCC_RTCCLKSOURCE_LSI); + __HAL_RCC_RTC_CONFIG(RCC_RTCCLKSOURCE_LSI); + // [TODO] This value is LSI typical value. To be measured precisely using a timer input capture + rtc_freq = LSI_VALUE; + } + + // Enable RTC + __HAL_RCC_RTC_ENABLE(); + + RtcHandle.Init.HourFormat = RTC_HOURFORMAT_24; + RtcHandle.Init.AsynchPrediv = 127; + RtcHandle.Init.SynchPrediv = (rtc_freq / 128) - 1; + RtcHandle.Init.OutPut = RTC_OUTPUT_DISABLE; + RtcHandle.Init.OutPutPolarity = RTC_OUTPUT_POLARITY_HIGH; + RtcHandle.Init.OutPutType = RTC_OUTPUT_TYPE_OPENDRAIN; + +#if defined(ORIGINAL) // modify part3 of 4 (Start) +#else + /* Write backup data into the backup RAM */ + RTC_WriteBackupRegister( RTC_BKP_DR0, RTC_DAT0 ); + RTC_WriteBackupRegister( RTC_BKP_DR1, RTC_DAT1 ); +#endif // modify part3 of 4 (End) + + if (HAL_RTC_Init(&RtcHandle) != HAL_OK) { + error("RTC error: RTC initialization failed."); + } +} + +void rtc_free(void) +{ + // Enable Power clock + __PWR_CLK_ENABLE(); + + // Enable access to Backup domain + HAL_PWR_EnableBkUpAccess(); + + // Reset Backup domain + __HAL_RCC_BACKUPRESET_FORCE(); + __HAL_RCC_BACKUPRESET_RELEASE(); + + // Disable access to Backup domain + HAL_PWR_DisableBkUpAccess(); + + // Disable LSI and LSE clocks + RCC_OscInitTypeDef RCC_OscInitStruct; + RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_LSI | RCC_OSCILLATORTYPE_LSE; + RCC_OscInitStruct.PLL.PLLState = RCC_PLL_NONE; + RCC_OscInitStruct.LSIState = RCC_LSI_OFF; + RCC_OscInitStruct.LSEState = RCC_LSE_OFF; + HAL_RCC_OscConfig(&RCC_OscInitStruct); + + rtc_inited = 0; +} + +int rtc_isenabled(void) +{ +#if defined(ORIGINAL) // modify part4 of 4 (Start) + return rtc_inited; +#else + return Check_Rtc_backup_reg(); +#endif // modify part4 of 4 (End) +} + +/* + RTC Registers + RTC_WeekDay 1=monday, 2=tuesday, ..., 7=sunday + RTC_Month 1=january, 2=february, ..., 12=december + RTC_Date day of the month 1-31 + RTC_Year year 0-99 + struct tm + tm_sec seconds after the minute 0-61 + tm_min minutes after the hour 0-59 + tm_hour hours since midnight 0-23 + tm_mday day of the month 1-31 + tm_mon months since January 0-11 + tm_year years since 1900 + tm_wday days since Sunday 0-6 + tm_yday days since January 1 0-365 + tm_isdst Daylight Saving Time flag +*/ +time_t rtc_read(void) +{ + RTC_DateTypeDef dateStruct; + RTC_TimeTypeDef timeStruct; + struct tm timeinfo; + + RtcHandle.Instance = RTC; + + // Read actual date and time + // Warning: the time must be read first! + HAL_RTC_GetTime(&RtcHandle, &timeStruct, FORMAT_BIN); + HAL_RTC_GetDate(&RtcHandle, &dateStruct, FORMAT_BIN); + + // Setup a tm structure based on the RTC + timeinfo.tm_wday = dateStruct.WeekDay; + timeinfo.tm_mon = dateStruct.Month - 1; + timeinfo.tm_mday = dateStruct.Date; + timeinfo.tm_year = dateStruct.Year + 100; + timeinfo.tm_hour = timeStruct.Hours; + timeinfo.tm_min = timeStruct.Minutes; + timeinfo.tm_sec = timeStruct.Seconds; + + // Convert to timestamp + time_t t = mktime(&timeinfo); + + return t; +} + +void rtc_write(time_t t) +{ + RTC_DateTypeDef dateStruct; + RTC_TimeTypeDef timeStruct; + + RtcHandle.Instance = RTC; + + // Convert the time into a tm + struct tm *timeinfo = localtime(&t); + + // Fill RTC structures + dateStruct.WeekDay = timeinfo->tm_wday; + dateStruct.Month = timeinfo->tm_mon + 1; + dateStruct.Date = timeinfo->tm_mday; + dateStruct.Year = timeinfo->tm_year - 100; + timeStruct.Hours = timeinfo->tm_hour; + timeStruct.Minutes = timeinfo->tm_min; + timeStruct.Seconds = timeinfo->tm_sec; + timeStruct.TimeFormat = RTC_HOURFORMAT12_PM; + timeStruct.DayLightSaving = RTC_DAYLIGHTSAVING_NONE; + timeStruct.StoreOperation = RTC_STOREOPERATION_RESET; + + // Change the RTC current date/time + HAL_RTC_SetDate(&RtcHandle, &dateStruct, FORMAT_BIN); + HAL_RTC_SetTime(&RtcHandle, &timeStruct, FORMAT_BIN); +} + +#endif + +#endif \ No newline at end of file