/**
******************************************************************************
* @file stm32f1xx_hal_timebase_rtc_alarm_template.c
* @author MCD Application Team
* @brief HAL time base based on the hardware RTC_ALARM.
*
* This file override the native HAL time base functions (defined as weak)
* to use the RTC ALARM for time base generation:
* + Intializes the RTC peripheral to increment the seconds registers each 1ms
* + The alarm is configured to assert an interrupt when the RTC reaches 1ms
* + HAL_IncTick is called at each Alarm event and the time is reset to 00:00:00
* + HSE (default), LSE or LSI can be selected as RTC clock source
@verbatim
==============================================================================
##### How to use this driver #####
==============================================================================
[..]
This file must be copied to the application folder and modified as follows:
(#) Rename it to 'stm32f1xx_hal_timebase_rtc_alarm.c'
(#) Add this file and the RTC HAL drivers to your project and uncomment
HAL_RTC_MODULE_ENABLED define in stm32f1xx_hal_conf.h
[..]
(@) HAL RTC alarm and HAL RTC wakeup drivers cant 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 stm32f1xx_hal_timebase_tim use is recommended for the Applications/Examples
requiring low power modes
@endverbatim
******************************************************************************
* @attention
*
* <h2><center>© Copyright (c) 2017 STMicroelectronics.
* All rights reserved.</center></h2>
*
* This software component is licensed by ST under BSD 3-Clause license,
* the "License"; You may not use this file except in compliance with the
* License. You may obtain a copy of the License at:
* opensource.org/licenses/BSD-3-Clause
*
******************************************************************************
*/
/* Includes ------------------------------------------------------------------*/
#include "stm32f1xx_hal.h"
/** @addtogroup STM32F1xx_HAL_Driver
* @{
*/
/** @defgroup HAL_TimeBase_RTC_Alarm_Template HAL TimeBase RTC Alarm 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 */
/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
RTC_HandleTypeDef hRTC_Handle;
/* Private function prototypes -----------------------------------------------*/
void RTC_Alarm_IRQHandler(void);
/* Private functions ---------------------------------------------------------*/
/**
* @brief This function configures the RTC_ALARMA 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;
#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;
PeriphClkInitStruct.RTCClockSelection = RCC_RTCCLKSOURCE_HSE_DIV128;
#else
#error Please select the RTC Clock source
#endif /* RTC_CLOCK_SOURCE_LSE */
if (HAL_RCC_OscConfig(&RCC_OscInitStruct) == HAL_OK)
{
PeriphClkInitStruct.PeriphClockSelection = RCC_PERIPHCLK_RTC;
if (HAL_RCCEx_PeriphCLKConfig(&PeriphClkInitStruct) == HAL_OK)
{
/* Enable RTC Clock */
__HAL_RCC_RTC_ENABLE();
hRTC_Handle.Instance = RTC;
/* Configure RTC time base to 10Khz */
hRTC_Handle.Init.AsynchPrediv = (HAL_RCCEx_GetPeriphCLKFreq(RCC_PERIPHCLK_RTC) / 10000) - 1;
hRTC_Handle.Init.OutPut = RTC_OUTPUTSOURCE_NONE;
HAL_RTC_Init(&hRTC_Handle);
/* Disable the write protection for RTC registers */
__HAL_RTC_WRITEPROTECTION_DISABLE(&hRTC_Handle);
/* Clear flag alarm A */
__HAL_RTC_ALARM_CLEAR_FLAG(&hRTC_Handle, RTC_FLAG_ALRAF);
counter = 0U;
/* Wait till RTC ALRAF flag is set and if Time out is reached exit */
while (__HAL_RTC_ALARM_GET_FLAG(&hRTC_Handle, RTC_FLAG_ALRAF) != RESET)
{
if (counter++ == SystemCoreClock / 48U) /* Timeout = ~ 1s */
{
return HAL_ERROR;
}
}
/* Set RTC COUNTER MSB word */
hRTC_Handle.Instance->ALRH = 0x00U;
/* Set RTC COUNTER LSB word */
hRTC_Handle.Instance->ALRL = 0x09U;
/* RTC Alarm Interrupt Configuration: EXTI configuration */
__HAL_RTC_ALARM_EXTI_ENABLE_IT();
__HAL_RTC_ALARM_EXTI_ENABLE_RISING_EDGE();
/* Clear Second and overflow flags */
CLEAR_BIT(hRTC_Handle.Instance->CRL, (RTC_FLAG_SEC | RTC_FLAG_OW));
/* Set RTC COUNTER MSB word */
hRTC_Handle.Instance->CNTH = 0x00U;
/* Set RTC COUNTER LSB word */
hRTC_Handle.Instance->CNTL = 0x00U;
/* Configure the Alarm interrupt */
__HAL_RTC_ALARM_ENABLE_IT(&hRTC_Handle, RTC_IT_ALRA);
/* Enable the write protection for RTC registers */
__HAL_RTC_WRITEPROTECTION_ENABLE(&hRTC_Handle);
/* Wait till RTC is in INIT state and if Time out is reached exit */
counter = 0U;
while ((hRTC_Handle.Instance->CRL & RTC_CRL_RTOFF) == (uint32_t)RESET)
{
if (counter++ == SystemCoreClock / 48U) /* Timeout = ~ 1s */
{
return HAL_ERROR;
}
}
HAL_NVIC_SetPriority(RTC_Alarm_IRQn, TickPriority, 0U);
HAL_NVIC_EnableIRQ(RTC_Alarm_IRQn);
return HAL_OK;
}
}
return HAL_ERROR;
}
/**
* @brief Suspend Tick increment.
* @note Disable the tick increment by disabling RTC ALARM interrupt.
* @param None
* @retval None
*/
void HAL_SuspendTick(void)
{
/* Disable RTC ALARM update Interrupt */
__HAL_RTC_ALARM_DISABLE_IT(&hRTC_Handle, RTC_IT_ALRA);
}
/**
* @brief Resume Tick increment.
* @note Enable the tick increment by Enabling RTC ALARM interrupt.
* @param None
* @retval None
*/
void HAL_ResumeTick(void)
{
__IO uint32_t counter = 0U;
/* Disable the write protection for RTC registers */
__HAL_RTC_WRITEPROTECTION_DISABLE(&hRTC_Handle);
/* Set RTC COUNTER MSB word */
hRTC_Handle.Instance->CNTH = 0x00U;
/* Set RTC COUNTER LSB word */
hRTC_Handle.Instance->CNTL = 0x00U;
/* Clear Second and overflow flags */
CLEAR_BIT(hRTC_Handle.Instance->CRL, (RTC_FLAG_SEC | RTC_FLAG_OW | RTC_FLAG_ALRAF));
/* Enable RTC ALARM Update interrupt */
__HAL_RTC_ALARM_ENABLE_IT(&hRTC_Handle, RTC_IT_ALRA);
/* Enable the write protection for RTC registers */
__HAL_RTC_WRITEPROTECTION_ENABLE(&hRTC_Handle);
/* Wait till RTC is in INIT state and if Time out is reached exit */
while ((hRTC_Handle.Instance->CRL & RTC_CRL_RTOFF) == (uint32_t)RESET)
{
if (counter++ == SystemCoreClock / 48U) /* Timeout = ~ 1s */
{
break;
}
}
}
/**
* @brief ALARM A Event Callback in non blocking mode
* @note This function is called when RTC_ALARM interrupt took place, inside
* RTC_ALARM_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_RTC_AlarmAEventCallback(RTC_HandleTypeDef *hrtc)
{
__IO uint32_t counter = 0U;
HAL_IncTick();
__HAL_RTC_WRITEPROTECTION_DISABLE(hrtc);
/* Set RTC COUNTER MSB word */
WRITE_REG(hrtc->Instance->CNTH, 0x00U);
/* Set RTC COUNTER LSB word */
WRITE_REG(hrtc->Instance->CNTL, 0x00U);
/* Clear Second and overflow flags */
CLEAR_BIT(hrtc->Instance->CRL, (RTC_FLAG_SEC | RTC_FLAG_OW));
/* Enable the write protection for RTC registers */
__HAL_RTC_WRITEPROTECTION_ENABLE(hrtc);
/* Wait till RTC is in INIT state and if Time out is reached exit */
while ((hrtc->Instance->CRL & RTC_CRL_RTOFF) == (uint32_t)RESET)
{
if (counter++ == SystemCoreClock / 48U) /* Timeout = ~ 1s */
{
break;
}
}
}
/**
* @brief This function handles RTC ALARM interrupt request.
* @retval None
*/
void RTC_Alarm_IRQHandler(void)
{
HAL_RTC_AlarmIRQHandler(&hRTC_Handle);
}
/**
* @}
*/
/**
* @}
*/
/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/