diff options
Diffstat (limited to 'tmk_core/tool/mbed/mbed-sdk/libraries/mbed/targets/hal/TARGET_STM/TARGET_STM32L0/TARGET_DISCO_L053C8/rtc_api.c')
| -rw-r--r-- | tmk_core/tool/mbed/mbed-sdk/libraries/mbed/targets/hal/TARGET_STM/TARGET_STM32L0/TARGET_DISCO_L053C8/rtc_api.c | 215 |
1 files changed, 215 insertions, 0 deletions
diff --git a/tmk_core/tool/mbed/mbed-sdk/libraries/mbed/targets/hal/TARGET_STM/TARGET_STM32L0/TARGET_DISCO_L053C8/rtc_api.c b/tmk_core/tool/mbed/mbed-sdk/libraries/mbed/targets/hal/TARGET_STM/TARGET_STM32L0/TARGET_DISCO_L053C8/rtc_api.c new file mode 100644 index 0000000000..4395fcd9f0 --- /dev/null +++ b/tmk_core/tool/mbed/mbed-sdk/libraries/mbed/targets/hal/TARGET_STM/TARGET_STM32L0/TARGET_DISCO_L053C8/rtc_api.c @@ -0,0 +1,215 @@ +/* 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 |