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/**
******************************************************************************
* @file k_rtc.c
* @author MCD Application Team
* @brief This file provides the kernel rtc functions
******************************************************************************
* @attention
*
* Copyright (c) 2017 STMicroelectronics.
* All rights reserved.
*
* This software is licensed under terms that can be found in the LICENSE file
* in the root directory of this software component.
* If no LICENSE file comes with this software, it is provided AS-IS.
*
******************************************************************************
*/
/* Includes ------------------------------------------------------------------*/
#include "k_rtc.h"
/** @addtogroup CORE
* @{
*/
/** @defgroup KERNEL_RTC
* @brief Kernel rtc routines
* @{
*/
/* External variables --------------------------------------------------------*/
/* Private typedef -----------------------------------------------------------*/
/* Private defines -----------------------------------------------------------*/
#define RTC_ASYNCH_PREDIV 0x7F /* LSI as RTC clock */
/* Private macros ------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
RTC_HandleTypeDef RtcHandle;
RCC_ClkInitTypeDef RCC_ClockFreq;
TIM_HandleTypeDef TimInputCaptureHandle;
static __IO uint32_t uwLsiFreq = 0;
__IO uint32_t uwCaptureNumber = 0;
__IO uint32_t uwPeriodValue = 0;
__IO uint32_t uwMeasurementDone = 0;
static uint32_t GetLSIFrequency(void);
/**
* @brief Configure the current time and date.
* @param None
* @retval None
*/
void k_CalendarBkupInit(void)
{
RCC_OscInitTypeDef RCC_OscInitStruct;
RCC_PeriphCLKInitTypeDef PeriphClkInitStruct;
/*##-1- Configure LSE as RTC clock source ##################################*/
RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_LSI | RCC_OSCILLATORTYPE_LSE;
RCC_OscInitStruct.PLL.PLLState = RCC_PLL_NONE;
RCC_OscInitStruct.LSEState = RCC_LSE_OFF;
RCC_OscInitStruct.LSIState = RCC_LSI_ON;
if(HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
{
return;
}
PeriphClkInitStruct.PeriphClockSelection = RCC_PERIPHCLK_RTC;
PeriphClkInitStruct.RTCClockSelection = RCC_RTCCLKSOURCE_LSI;
if(HAL_RCCEx_PeriphCLKConfig(&PeriphClkInitStruct) != HAL_OK)
{
return;
}
/*##-3- Get the LSI frequency: TIM5 is used to measure the LSI frequency ###*/
uwLsiFreq = GetLSIFrequency();
/*##-1- Configure the RTC peripheral #######################################*/
/* Configure RTC prescaler and RTC data registers */
/* RTC configured as follow:
- Hour Format = Format 24
- Asynch Prediv = Value according to source clock
- Synch Prediv = Value according to source clock
- OutPut = Output Disable
- OutPutPolarity = High Polarity
- OutPutType = Open Drain */
RtcHandle.Instance = RTC;
RtcHandle.Init.HourFormat = RTC_HOURFORMAT_24;
RtcHandle.Init.AsynchPrediv = RTC_ASYNCH_PREDIV;
RtcHandle.Init.SynchPrediv = (uwLsiFreq/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)
{
}
}
/**
* @brief RTC MSP Initialization
* This function configures the hardware resources used in this example:
* - Peripheral's clock enable
* @param hrtc: RTC handle pointer
* @retval None
*/
void HAL_RTC_MspInit(RTC_HandleTypeDef *hrtc)
{
/*##-2- Enable RTC peripheral Clocks #######################################*/
/* Enable RTC Clock */
__HAL_RCC_RTC_ENABLE();
}
/**
* @brief TIM MSP Initialization
* This function configures the hardware resources used in this example:
* - Peripheral's clock enable
* @param htim: TIM handle pointer
* @retval None
*/
void HAL_TIM_IC_MspInit(TIM_HandleTypeDef *htim)
{
/* TIM5 Peripheral clock enable */
__HAL_RCC_TIM5_CLK_ENABLE();
/* Configure the NVIC for TIM5 */
HAL_NVIC_SetPriority(TIM5_IRQn, 0, 0);
/* Enable the TIM5 global Interrupt */
HAL_NVIC_EnableIRQ(TIM5_IRQn);
}
/**
* @brief Configures TIM5 to measure the LSI oscillator frequency.
* @param None
* @retval LSI Frequency
*/
static uint32_t GetLSIFrequency(void)
{
uint32_t pclk1 = 0;
TIM_IC_InitTypeDef timinputconfig;
/* Configure the TIM peripheral */
/* Set TIM5 instance */
TimInputCaptureHandle.Instance = TIM5;
/* TIM5 configuration: Input Capture mode ---------------------
The LSI oscillator is connected to TIM5 CH4.
The Rising edge is used as active edge.
The TIM5 CCR4 is used to compute the frequency value.
------------------------------------------------------------ */
TimInputCaptureHandle.Init.Prescaler = 0;
TimInputCaptureHandle.Init.CounterMode = TIM_COUNTERMODE_UP;
TimInputCaptureHandle.Init.Period = 0xFFFF;
TimInputCaptureHandle.Init.ClockDivision = 0;
TimInputCaptureHandle.Init.RepetitionCounter = 0;
if(HAL_TIM_IC_Init(&TimInputCaptureHandle) != HAL_OK)
{}
/* Connect internally the TIM5_CH4 Input Capture to the LSI clock output */
HAL_TIMEx_RemapConfig(&TimInputCaptureHandle, TIM_TIM5_LSI);
/* Configure the Input Capture of channel 4 */
timinputconfig.ICPolarity = TIM_ICPOLARITY_RISING;
timinputconfig.ICSelection = TIM_ICSELECTION_DIRECTTI;
timinputconfig.ICPrescaler = TIM_ICPSC_DIV8;
timinputconfig.ICFilter = 0;
if(HAL_TIM_IC_ConfigChannel(&TimInputCaptureHandle, &timinputconfig, TIM_CHANNEL_4) != HAL_OK)
{}
/* Reset the flags */
TimInputCaptureHandle.Instance->SR = 0;
/* Start the TIM Input Capture measurement in interrupt mode */
if(HAL_TIM_IC_Start_IT(&TimInputCaptureHandle, TIM_CHANNEL_4) != HAL_OK)
{
}
/* Wait until the TIM5 get 2 LSI edges (refer to TIM5_IRQHandler() in
stm32f4xx_it.c file) */
while(uwMeasurementDone == 0)
{
}
uwCaptureNumber = 0;
/* Deinitialize the TIM5 peripheral registers to their default reset values */
HAL_TIM_IC_DeInit(&TimInputCaptureHandle);
/* Compute the LSI frequency, depending on TIM5 input clock frequency (PCLK1)*/
/* Get PCLK1 frequency */
pclk1 = HAL_RCC_GetPCLK1Freq();
/* Get PCLK1 prescaler */
if((RCC->CFGR & RCC_CFGR_PPRE1) == 0)
{
/* PCLK1 prescaler equal to 1 => TIMCLK = PCLK1 */
return ((pclk1 * 8) / uwPeriodValue);
}
else
{
/* PCLK1 prescaler different from 1 => TIMCLK = 2 * PCLK1 */
return (((2 * pclk1) * 8) / uwPeriodValue);
}
}
/**
* @brief RTC MSP De-Initialization
* This function frees the hardware resources used in this example:
* - Disable the Peripheral's clock
* @param hrtc: RTC handle pointer
* @retval None
*/
void HAL_RTC_MspDeInit(RTC_HandleTypeDef *hrtc)
{
/*##-1- Reset peripherals ##################################################*/
__HAL_RCC_RTC_DISABLE();
}
/**
* @brief Backup save parameter
* @param address: RTC Backup data Register number.
* This parameter can be: RTC_BKP_DRx where x can be from 0 to 19 to
* specify the register.
* @param Data: Data to be written in the specified RTC Backup data register.
* @retval None
*/
void k_BkupSaveParameter(uint32_t address, uint32_t data)
{
HAL_RTCEx_BKUPWrite(&RtcHandle,address,data);
}
/**
* @brief Backup restore parameter.
* @param address: RTC Backup data Register number.
* This parameter can be: RTC_BKP_DRx where x can be from 0 to 19 to
* specify the register.
* @retval None
*/
uint32_t k_BkupRestoreParameter(uint32_t address)
{
return HAL_RTCEx_BKUPRead(&RtcHandle,address);
}
/**
* @brief RTC Get time.
* @param Time: Pointer to Time structure
* @retval None
*/
void k_GetTime( RTC_TimeTypeDef *Time)
{
HAL_RTC_GetTime(&RtcHandle, Time, RTC_FORMAT_BIN);
}
/**
* @brief RTC Set time.
* @param Time: Pointer to Time structure
* @retval None
*/
void k_SetTime( RTC_TimeTypeDef *Time)
{
Time->StoreOperation = 0;
Time->SubSeconds = 0;
Time->DayLightSaving = 0;
HAL_RTC_SetTime(&RtcHandle, Time, RTC_FORMAT_BIN);
}
/**
* @brief RTC Get date
* @param Date: Pointer to Date structure
* @retval None
*/
void k_GetDate( RTC_DateTypeDef *Date)
{
HAL_RTC_GetDate(&RtcHandle, Date, RTC_FORMAT_BIN);
if((Date->Date == 0) || (Date->Month == 0))
{
Date->Date = Date->Month = 1;
}
}
/**
* @brief RTC Set date
* @param Date: Pointer to Date structure
* @retval None
*/
void k_SetDate( RTC_DateTypeDef *Date)
{
HAL_RTC_SetDate(&RtcHandle, Date, RTC_FORMAT_BIN);
}
/**
* @}
*/
/**
* @}
*/
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