+++ /dev/null
-/* 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"
-
-/* The mcu STM32L053C8 seems to have a problem in the RCC - LSE hardware block. The Disco_L053 don't have a 32kHz crystal connected to LSE port pins.
- * During initialization the HAL tests if it can start the LSE oscillator. The Flag LSERDY in RCC_CSR should be set to 1 by RCC clock control when
- * the oscillator runs stable. Without a crystal the flag shouldn't be set and the HAL trys to start the internal LSI oscillator.
- * But the flag is also set to 1 without a crystal. That's why the RTC doesn't start.
- *
- */
-#define DONT_USE_LSE
-
-#if DEVICE_RTC
-
-#include "mbed_error.h"
-
-static int rtc_inited = 0;
-
-static RTC_HandleTypeDef RtcHandle;
-
-void rtc_init(void)
-{
- RCC_OscInitTypeDef RCC_OscInitStruct;
- uint32_t rtc_freq = 0;
-
- if (rtc_inited) return;
- rtc_inited = 1;
-
- RtcHandle.Instance = RTC;
-
- // 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();
-
- // 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
-#ifndef DONT_USE_LSE
- 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 {
-#endif
- // 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);
- // This value is LSI typical value. To be measured precisely using a timer input capture for example.
- rtc_freq = 37000;
-#ifndef DONT_USE_LSE
- }
-#endif
-
- // 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 (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)
-{
- 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;
-
- 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