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/**
******************************************************************************
* @file stm32f2xx_hal_timebase_rtc_wakeup_template.c
* @author MCD Application Team
* @brief HAL time base based on the hardware RTC_WAKEUP Template.
*
* This file overrides the native HAL time base functions (defined as weak)
* to use the RTC WAKEUP for the time base generation:
* + Intializes the RTC peripheral with required prescalers value for each
* RTC clock source (HSE, LSE or LSI)
* + The wakeup feature is configured to assert an interrupt each 1ms
* + HAL_IncTick is called inside the HAL_RTCEx_WakeUpTimerEventCallback
* + HSE (default), LSE or LSI can be selected as RTC clock source
*
******************************************************************************
* @attention
*
* Copyright (c) 2016 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.
*
******************************************************************************
@verbatim
==============================================================================
##### How to use this driver #####
==============================================================================
[..]
This file must be copied to the application folder and modified as follows:
(#) Rename it to 'stm32f2xx_hal_timebase_rtc_wakeup.c'
(#) Add this file and the RTC HAL drivers to your project and uncomment
HAL_RTC_MODULE_ENABLED define in stm32f2xx_hal_conf.h
[..]
(@) HAL RTC alarm and HAL RTC wakeup drivers can’t be used with low power modes:
The wake up capability of the RTC may be intrusive in case of prior low power mode
configuration requiring different wake up sources.
Application/Example behavior is no more guaranteed
(@) The stm32f2xx_hal_timebase_tim use is recommended for the Applications/Examples
requiring low power modes
@endverbatim
******************************************************************************
*/
/* Includes ------------------------------------------------------------------*/
#include "stm32f2xx_hal.h"
/** @addtogroup STM32F2xx_HAL_Driver
* @{
*/
/** @defgroup HAL_TimeBase_RTC_WakeUp_Template HAL TimeBase RTC WakeUp Template
* @{
*/
/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
/* Uncomment the line below to select the appropriate RTC Clock source for your application:
+ RTC_CLOCK_SOURCE_HSE: can be selected for applications requiring timing precision.
+ RTC_CLOCK_SOURCE_LSE: can be selected for applications with low constraint on timing
precision.
+ RTC_CLOCK_SOURCE_LSI: can be selected for applications with low constraint on timing
precision.
*/
#define RTC_CLOCK_SOURCE_HSE
/* #define RTC_CLOCK_SOURCE_LSE */
/* #define RTC_CLOCK_SOURCE_LSI */
#ifdef RTC_CLOCK_SOURCE_HSE
#define RTC_ASYNCH_PREDIV 99U
#define RTC_SYNCH_PREDIV 9U
#define RCC_RTCCLKSOURCE_1MHZ ((uint32_t)((uint32_t)RCC_BDCR_RTCSEL | (uint32_t)((HSE_VALUE/1000000U) << 16U)))
#elif defined (RTC_CLOCK_SOURCE_LSE)
#define RTC_ASYNCH_PREDIV 2U
#define RTC_SYNCH_PREDIV 0U
#else /* RTC_CLOCK_SOURCE_LSI */
#define RTC_ASYNCH_PREDIV 1U
#define RTC_SYNCH_PREDIV 0U
#endif /* RTC_CLOCK_SOURCE_HSE */
/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
RTC_HandleTypeDef hRTC_Handle;
/* Private function prototypes -----------------------------------------------*/
void RTC_WKUP_IRQHandler(void);
/* Private functions ---------------------------------------------------------*/
/**
* @brief This function configures the RTC_WKUP as a time base source.
* The time source is configured to have 1ms time base with a dedicated
* Tick interrupt priority.
* @note This function is called automatically at the beginning of program after
* reset by HAL_Init() or at any time when clock is configured, by HAL_RCC_ClockConfig().
* @param TickPriority Tick interrupt priority.
* @retval HAL status
*/
HAL_StatusTypeDef HAL_InitTick(uint32_t TickPriority)
{
__IO uint32_t counter = 0U;
RCC_OscInitTypeDef RCC_OscInitStruct;
RCC_PeriphCLKInitTypeDef PeriphClkInitStruct;
HAL_StatusTypeDef status;
#ifdef RTC_CLOCK_SOURCE_LSE
/* Configue LSE as RTC clock soucre */
RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_LSE;
RCC_OscInitStruct.PLL.PLLState = RCC_PLL_NONE;
RCC_OscInitStruct.LSEState = RCC_LSE_ON;
PeriphClkInitStruct.RTCClockSelection = RCC_RTCCLKSOURCE_LSE;
#elif defined (RTC_CLOCK_SOURCE_LSI)
/* Configue LSI as RTC clock soucre */
RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_LSI;
RCC_OscInitStruct.PLL.PLLState = RCC_PLL_NONE;
RCC_OscInitStruct.LSIState = RCC_LSI_ON;
PeriphClkInitStruct.RTCClockSelection = RCC_RTCCLKSOURCE_LSI;
#elif defined (RTC_CLOCK_SOURCE_HSE)
/* Configue HSE as RTC clock soucre */
RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE;
RCC_OscInitStruct.PLL.PLLState = RCC_PLL_NONE;
RCC_OscInitStruct.HSEState = RCC_HSE_ON;
/* Ensure that RTC is clocked by 1MHz */
PeriphClkInitStruct.RTCClockSelection = RCC_RTCCLKSOURCE_1MHZ;
#else
#error Please select the RTC Clock source
#endif /* RTC_CLOCK_SOURCE_LSE */
status = HAL_RCC_OscConfig(&RCC_OscInitStruct);
if (status == HAL_OK)
{
PeriphClkInitStruct.PeriphClockSelection = RCC_PERIPHCLK_RTC;
status = HAL_RCCEx_PeriphCLKConfig(&PeriphClkInitStruct);
}
if (status == HAL_OK)
{
/* Enable RTC Clock */
__HAL_RCC_RTC_ENABLE();
/* The time base should be 1ms
Time base = ((RTC_ASYNCH_PREDIV + 1) * (RTC_SYNCH_PREDIV + 1) * (WakeUpCounter + 1)) / RTC_CLOCK
HSE as RTC clock
Time base = ((99 + 1) * (9 + 1) * (0 + 1)) / 1Mhz
= 1ms
LSE as RTC clock
Time base = ((2 + 1) * (0 + 1) * (10 + 1)) / 32.768Khz
= ~1ms
LSI as RTC clock
Time base = ((1 + 1) * (0 + 1) * (15 + 1)) / 32Khz
= 1ms
*/
hRTC_Handle.Instance = RTC;
hRTC_Handle.Init.HourFormat = RTC_HOURFORMAT_24;
hRTC_Handle.Init.AsynchPrediv = RTC_ASYNCH_PREDIV;
hRTC_Handle.Init.SynchPrediv = RTC_SYNCH_PREDIV;
hRTC_Handle.Init.OutPut = RTC_OUTPUT_DISABLE;
hRTC_Handle.Init.OutPutPolarity = RTC_OUTPUT_POLARITY_HIGH;
hRTC_Handle.Init.OutPutType = RTC_OUTPUT_TYPE_OPENDRAIN;
status = HAL_RTC_Init(&hRTC_Handle);
}
if (status == HAL_OK)
{
/* Disable the write protection for RTC registers */
__HAL_RTC_WRITEPROTECTION_DISABLE(&hRTC_Handle);
/* Disable the Wake-up Timer */
__HAL_RTC_WAKEUPTIMER_DISABLE(&hRTC_Handle);
/* In case of interrupt mode is used, the interrupt source must disabled */
__HAL_RTC_WAKEUPTIMER_DISABLE_IT(&hRTC_Handle, RTC_IT_WUT);
/* Wait till RTC WUTWF flag is set */
while (__HAL_RTC_WAKEUPTIMER_GET_FLAG(&hRTC_Handle, RTC_FLAG_WUTWF) == RESET)
{
if (counter++ == SystemCoreClock / 48U)
{
status = HAL_ERROR;
}
}
}
if (status == HAL_OK)
{
/* Clear PWR wake up Flag */
__HAL_PWR_CLEAR_FLAG(PWR_FLAG_WU);
/* Clear RTC Wake Up timer Flag */
__HAL_RTC_WAKEUPTIMER_CLEAR_FLAG(&hRTC_Handle, RTC_FLAG_WUTF);
/* Configure the Wake-up Timer counter */
#ifdef RTC_CLOCK_SOURCE_HSE
hRTC_Handle.Instance->WUTR = 0U;
#elif defined (RTC_CLOCK_SOURCE_LSE)
hRTC_Handle.Instance->WUTR = 10U;
#else
hRTC_Handle.Instance->WUTR = 15U;
#endif
/* Clear the Wake-up Timer clock source bits in CR register */
hRTC_Handle.Instance->CR &= (uint32_t)~RTC_CR_WUCKSEL;
/* Configure the clock source */
hRTC_Handle.Instance->CR |= (uint32_t)RTC_WAKEUPCLOCK_CK_SPRE_16BITS;
/* RTC WakeUpTimer Interrupt Configuration: EXTI configuration */
__HAL_RTC_WAKEUPTIMER_EXTI_ENABLE_IT();
__HAL_RTC_WAKEUPTIMER_EXTI_ENABLE_RISING_EDGE();
/* Configure the Interrupt in the RTC_CR register */
__HAL_RTC_WAKEUPTIMER_ENABLE_IT(&hRTC_Handle, RTC_IT_WUT);
/* Enable the Wake-up Timer */
__HAL_RTC_WAKEUPTIMER_ENABLE(&hRTC_Handle);
/* Enable the write protection for RTC registers */
__HAL_RTC_WRITEPROTECTION_ENABLE(&hRTC_Handle);
/* Enable the RTC global Interrupt */
HAL_NVIC_EnableIRQ(RTC_WKUP_IRQn);
/* Configure the SysTick IRQ priority */
if (TickPriority < (1UL << __NVIC_PRIO_BITS))
{
HAL_NVIC_SetPriority(RTC_WKUP_IRQn, TickPriority, 0U);
uwTickPrio = TickPriority;
}
else
{
status = HAL_ERROR;
}
}
return status;
}
/**
* @brief Suspend Tick increment.
* @note Disable the tick increment by disabling RTC_WKUP interrupt.
* @param None
* @retval None
*/
void HAL_SuspendTick(void)
{
/* Disable the write protection for RTC registers */
__HAL_RTC_WRITEPROTECTION_DISABLE(&hRTC_Handle);
/* Disable WAKE UP TIMER Interrupt */
__HAL_RTC_WAKEUPTIMER_DISABLE_IT(&hRTC_Handle, RTC_IT_WUT);
/* Enable the write protection for RTC registers */
__HAL_RTC_WRITEPROTECTION_ENABLE(&hRTC_Handle);
}
/**
* @brief Resume Tick increment.
* @note Enable the tick increment by Enabling RTC_WKUP interrupt.
* @param None
* @retval None
*/
void HAL_ResumeTick(void)
{
/* Disable the write protection for RTC registers */
__HAL_RTC_WRITEPROTECTION_DISABLE(&hRTC_Handle);
/* Enable WAKE UP TIMER interrupt */
__HAL_RTC_WAKEUPTIMER_ENABLE_IT(&hRTC_Handle, RTC_IT_WUT);
/* Enable the write protection for RTC registers */
__HAL_RTC_WRITEPROTECTION_ENABLE(&hRTC_Handle);
}
/**
* @brief Wake Up Timer Event Callback in non blocking mode
* @note This function is called when RTC_WKUP interrupt took place, inside
* RTC_WKUP_IRQHandler(). It makes a direct call to HAL_IncTick() to increment
* a global variable "uwTick" used as application time base.
* @param hrtc RTC handle
* @retval None
*/
void HAL_RTCEx_WakeUpTimerEventCallback(RTC_HandleTypeDef *hrtc)
{
HAL_IncTick();
}
/**
* @brief This function handles WAKE UP TIMER interrupt request.
* @param None
* @retval None
*/
void RTC_WKUP_IRQHandler(void)
{
HAL_RTCEx_WakeUpTimerIRQHandler(&hRTC_Handle);
}
/**
* @}
*/
/**
* @}
*/