mbed library sources
Dependents: FRDM-KL46Z_LCD_Test FRDM-KL46Z_LCD_Test FRDM-KL46Z_Plantilla FRDM-KL46Z_Plantilla ... more
Diff: targets/hal/TARGET_STM/TARGET_STM32F3XX/rtc_api.c
- Revision:
- 0:6bc4ac881c8e
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/targets/hal/TARGET_STM/TARGET_STM32F3XX/rtc_api.c Thu Jul 28 15:56:34 2016 +0000 @@ -0,0 +1,138 @@ +/* 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" + +static int rtc_inited = 0; + +void rtc_init(void) { + RCC_APB1PeriphClockCmd(RCC_APB1Periph_PWR, ENABLE); // Enable PWR clock + + PWR_BackupAccessCmd(ENABLE); // Enable access to RTC + + // Be sure to start correctly + RCC_BackupResetCmd(ENABLE); + RCC_BackupResetCmd(DISABLE); + + // Note: the LSI is used as RTC source clock + // The RTC Clock may vary due to LSI frequency dispersion. + RCC_LSICmd(ENABLE); // Enable LSI + + while (RCC_GetFlagStatus(RCC_FLAG_LSIRDY) == RESET) {} // Wait until ready + + RCC_RTCCLKConfig(RCC_RTCCLKSource_LSI); // Select LSI as RTC Clock Source + + RCC_RTCCLKCmd(ENABLE); // Enable RTC Clock + + RTC_WaitForSynchro(); // Wait for RTC registers synchronization + + uint32_t lsi_freq = 40000; // [TODO] To be measured precisely using a timer input capture + + RTC_InitTypeDef RTC_InitStructure; + RTC_InitStructure.RTC_AsynchPrediv = 127; + RTC_InitStructure.RTC_SynchPrediv = (lsi_freq / 128) - 1; + RTC_InitStructure.RTC_HourFormat = RTC_HourFormat_24; + RTC_Init(&RTC_InitStructure); + + rtc_inited = 1; +} + +void rtc_free(void) { + RCC_DeInit(); // Resets the RCC clock configuration to the default reset state + rtc_inited = 0; +} + +int rtc_isenabled(void) { + return rtc_inited; +} + +/* + 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; + + // Read actual date and time + RTC_GetTime(RTC_Format_BIN, &timeStruct); + RTC_GetDate(RTC_Format_BIN, &dateStruct); + + // Setup a tm structure based on the RTC + timeinfo.tm_wday = dateStruct.RTC_WeekDay; + timeinfo.tm_mon = dateStruct.RTC_Month - 1; + timeinfo.tm_mday = dateStruct.RTC_Date; + timeinfo.tm_year = dateStruct.RTC_Year + 100; + timeinfo.tm_hour = timeStruct.RTC_Hours; + timeinfo.tm_min = timeStruct.RTC_Minutes; + timeinfo.tm_sec = timeStruct.RTC_Seconds; + + // Convert to timestamp + time_t t = mktime(&timeinfo); + + return t; +} + +void rtc_write(time_t t) { + RTC_DateTypeDef dateStruct; + RTC_TimeTypeDef timeStruct; + + // Convert the time into a tm + struct tm *timeinfo = localtime(&t); + + // Fill RTC structures + dateStruct.RTC_WeekDay = timeinfo->tm_wday; + dateStruct.RTC_Month = timeinfo->tm_mon + 1; + dateStruct.RTC_Date = timeinfo->tm_mday; + dateStruct.RTC_Year = timeinfo->tm_year - 100; + timeStruct.RTC_Hours = timeinfo->tm_hour; + timeStruct.RTC_Minutes = timeinfo->tm_min; + timeStruct.RTC_Seconds = timeinfo->tm_sec; + timeStruct.RTC_H12 = RTC_HourFormat_24; + + // Change the RTC current date/time + PWR_BackupAccessCmd(ENABLE); // Enable access to RTC + RTC_SetDate(RTC_Format_BIN, &dateStruct); + RTC_SetTime(RTC_Format_BIN, &timeStruct); + PWR_BackupAccessCmd(DISABLE); // Disable access to RTC +}