Revision 100:7c647ea3c13d, committed 2016-03-25

Comitter:

mbed_official

Date:

Fri Mar 25 14:45:11 2016 +0000

Parent:

99:740f8f9b184c

Child:

101:df8ef1d8a4b1

Commit message:

Synchronized with git revision 4e40445b73e6e935b7d25568a0fab03a338b9a29

Full URL: https://github.com/mbedmicro/mbed/commit/4e40445b73e6e935b7d25568a0fab03a338b9a29/

[STM32L0] RTC update

Changed in this revision

--- a/targets/hal/TARGET_STM/TARGET_STM32L0/TARGET_DISCO_L053C8/rtc_api.c	Thu Mar 24 09:30:10 2016 +0000
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,229 +0,0 @@
-/* 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"
-
-/* 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"
-
-#if DEVICE_RTC_LSI
-static int rtc_inited = 0;
-#endif
-
-static RTC_HandleTypeDef RtcHandle;
-
-void rtc_init(void)
-{
-    RCC_OscInitTypeDef RCC_OscInitStruct;
-    uint32_t rtc_freq = 0;
-
-#if DEVICE_RTC_LSI
-    if (rtc_inited) return;
-    rtc_inited = 1;
-#endif
-
-    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();
-
-#if !DEVICE_RTC_LSI
-    // 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 {
-	    error("Cannot initialize RTC with LSE\n");
-    }
-#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);
-	// This value is LSI typical value. To be measured precisely using a timer input capture for example.
-	rtc_freq = 37000;
-#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);
-
-#if DEVICE_RTC_LSI
-    rtc_inited = 0;
-#endif
-}
-
-int rtc_isenabled(void)
-{
-#if DEVICE_RTC_LSI
-  return rtc_inited;
-#else
-  if ((RTC->ISR & RTC_ISR_INITS) ==  RTC_ISR_INITS) {
-    return 1;
-  } else {
-    return 0;
-  }
-#endif
-}
-
-/*
- 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

--- a/targets/hal/TARGET_STM/TARGET_STM32L0/TARGET_NUCLEO_L053R8/rtc_api.c	Thu Mar 24 09:30:10 2016 +0000
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,221 +0,0 @@
-/* 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"
-
-#if DEVICE_RTC_LSI
-static int rtc_inited = 0;
-#endif
-
-static RTC_HandleTypeDef RtcHandle;
-
-void rtc_init(void)
-{
-    RCC_OscInitTypeDef RCC_OscInitStruct;
-    uint32_t rtc_freq = 0;
-
-#if DEVICE_RTC_LSI
-    if (rtc_inited) return;
-    rtc_inited = 1;
-#endif
-
-    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();
-
-#if !DEVICE_RTC_LSI
-    // 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 {
-	    error("Cannot initialize RTC with LSE\n");
-    }
-#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);
-	// This value is LSI typical value. To be measured precisely using a timer input capture for example.
-	rtc_freq = 32000;
-#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);
-
-#if DEVICE_RTC_LSI
-    rtc_inited = 0;
-#endif
-}
-
-int rtc_isenabled(void)
-{
-#if DEVICE_RTC_LSI
-  return rtc_inited;
-#else
-  if ((RTC->ISR & RTC_ISR_INITS) ==  RTC_ISR_INITS) {
-    return 1;
-  } else {
-    return 0;
-  }
-#endif
-}
-
-/*
- 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

--- a/targets/hal/TARGET_STM/TARGET_STM32L0/TARGET_NUCLEO_L073RZ/rtc_api.c	Thu Mar 24 09:30:10 2016 +0000
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,221 +0,0 @@
-/* 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"
-
-#if DEVICE_RTC_LSI
-static int rtc_inited = 0;
-#endif
-
-static RTC_HandleTypeDef RtcHandle;
-
-void rtc_init(void)
-{
-    RCC_OscInitTypeDef RCC_OscInitStruct;
-    uint32_t rtc_freq = 0;
-
-#if DEVICE_RTC_LSI
-    if (rtc_inited) return;
-    rtc_inited = 1;
-#endif
-
-    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();
-
-#if !DEVICE_RTC_LSI
-    // 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 {
-	    error("Cannot initialize RTC with LSE\n");
-    }
-#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);
-	// This value is LSI typical value. To be measured precisely using a timer input capture for example.
-	rtc_freq = 32000;
-#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);
-
-#if DEVICE_RTC_LSI
-    rtc_inited = 0;
-#endif
-}
-
-int rtc_isenabled(void)
-{
-#if DEVICE_RTC_LSI
-  return rtc_inited;
-#else
-  if ((RTC->ISR & RTC_ISR_INITS) ==  RTC_ISR_INITS) {
-    return 1;
-  } else {
-    return 0;
-  }
-#endif
-}
-
-/*
- 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

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/targets/hal/TARGET_STM/TARGET_STM32L0/rtc_api.c	Fri Mar 25 14:45:11 2016 +0000
@@ -0,0 +1,221 @@
+/* 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"
+
+#if DEVICE_RTC_LSI
+static int rtc_inited = 0;
+#endif
+
+static RTC_HandleTypeDef RtcHandle;
+
+void rtc_init(void)
+{
+    RCC_OscInitTypeDef RCC_OscInitStruct;
+    uint32_t rtc_freq = 0;
+
+#if DEVICE_RTC_LSI
+    if (rtc_inited) return;
+    rtc_inited = 1;
+#endif
+
+    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();
+
+#if !DEVICE_RTC_LSI
+    // 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 {
+        error("Cannot initialize RTC with LSE\n");
+    }
+#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);
+    // This value is LSI typical value. To be measured precisely using a timer input capture for example.
+    rtc_freq = 38000;
+#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);
+
+#if DEVICE_RTC_LSI
+    rtc_inited = 0;
+#endif
+}
+
+int rtc_isenabled(void)
+{
+#if DEVICE_RTC_LSI
+  return rtc_inited;
+#else
+  if ((RTC->ISR & RTC_ISR_INITS) ==  RTC_ISR_INITS) {
+    return 1;
+  } else {
+    return 0;
+  }
+#endif
+}
+
+/*
+ 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