/** ****************************************************************************** * @file stm32f0xx_hal_timebase_rtc_alarm_template.c * @brief HAL time base based on the hardware RTC_ALARM Template. * * 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 'stm32f0xx_hal_timebase_rtc_alarm.c' (#) Add this file and the RTC HAL drivers to your project and uncomment HAL_RTC_MODULE_ENABLED define in stm32f0xx_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 stm32f0xx_hal_timebase_tim use is recommended for the Applications/Examples requiring low power modes @endverbatim ****************************************************************************** * @attention * *

© Copyright (c) 2016 STMicroelectronics. * All rights reserved.

* * 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 "stm32f0xx_hal.h" /** @addtogroup STM32F0xx_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 */ #if defined(RTC_CLOCK_SOURCE_HSE) #define RTC_ASYNCH_PREDIV 49U #define RTC_SYNCH_PREDIV 4U #elif defined(RTC_CLOCK_SOURCE_LSE) #define RTC_ASYNCH_PREDIV 0U #define RTC_SYNCH_PREDIV 31U #else /* CLOCK_SOURCE_LSI */ #define RTC_ASYNCH_PREDIV 0U #define RTC_SYNCH_PREDIV 39U #endif /* RTC_CLOCK_SOURCE_HSE */ /* Private macro -------------------------------------------------------------*/ /* Private variables ---------------------------------------------------------*/ RTC_HandleTypeDef hRTC_Handle; /* Private function prototypes -----------------------------------------------*/ void RTC_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_DIV32; #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(); /* The time base should be 1ms Time base = ((RTC_ASYNCH_PREDIV + 1) * (RTC_SYNCH_PREDIV + 1)) / RTC_CLOCK HSE/32 as RTC clock and HSE 8MHz Time base = ((49 + 1) * (4 + 1)) / 250kHz = 1ms LSE as RTC clock Time base = ((31 + 1) * (0 + 1)) / 32.768KHz = ~1ms LSI as RTC clock Time base = ((39 + 1) * (0 + 1)) / 40KHz = 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; HAL_RTC_Init(&hRTC_Handle); /* Disable the write protection for RTC registers */ __HAL_RTC_WRITEPROTECTION_DISABLE(&hRTC_Handle); /* Disable the Alarm A interrupt */ __HAL_RTC_ALARMA_DISABLE(&hRTC_Handle); /* Clear flag alarm A */ __HAL_RTC_ALARM_CLEAR_FLAG(&hRTC_Handle, RTC_FLAG_ALRAF); counter = 0U; /* Wait till RTC ALRAWF flag is set and if Time out is reached exit */ while(__HAL_RTC_ALARM_GET_FLAG(&hRTC_Handle, RTC_FLAG_ALRAWF) == RESET) { if(counter++ == (SystemCoreClock /48U)) /* Timeout = ~ 1s */ { return HAL_ERROR; } } hRTC_Handle.Instance->ALRMAR = 0x01U; /* Configure the Alarm state: Enable Alarm */ __HAL_RTC_ALARMA_ENABLE(&hRTC_Handle); /* Configure the Alarm interrupt */ __HAL_RTC_ALARM_ENABLE_IT(&hRTC_Handle, RTC_IT_ALRA); /* RTC Alarm Interrupt Configuration: EXTI configuration */ __HAL_RTC_ALARM_EXTI_ENABLE_IT(); __HAL_RTC_ALARM_EXTI_ENABLE_RISING_EDGE(); /* Check if the Initialization mode is set */ if((hRTC_Handle.Instance->ISR & RTC_ISR_INITF) == (uint32_t)RESET) { /* Set the Initialization mode */ hRTC_Handle.Instance->ISR = (uint32_t)RTC_INIT_MASK; counter = 0U; while((hRTC_Handle.Instance->ISR & RTC_ISR_INITF) == (uint32_t)RESET) { if(counter++ == (SystemCoreClock /48U)) /* Timeout = ~ 1s */ { return HAL_ERROR; } } } hRTC_Handle.Instance->DR = 0U; hRTC_Handle.Instance->TR = 0U; hRTC_Handle.Instance->ISR &= (uint32_t)~RTC_ISR_INIT; /* Enable the write protection for RTC registers */ __HAL_RTC_WRITEPROTECTION_ENABLE(&hRTC_Handle); HAL_NVIC_SetPriority(RTC_IRQn, TickPriority, 0U); HAL_NVIC_EnableIRQ(RTC_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 the write protection for RTC registers */ __HAL_RTC_WRITEPROTECTION_DISABLE(&hRTC_Handle); /* Disable RTC ALARM update Interrupt */ __HAL_RTC_ALARM_DISABLE_IT(&hRTC_Handle, RTC_IT_ALRA); /* 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 ALARM interrupt. * @param None * @retval None */ void HAL_ResumeTick(void) { /* Disable the write protection for RTC registers */ __HAL_RTC_WRITEPROTECTION_DISABLE(&hRTC_Handle); /* 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); } /** * @brief ALARM A Event Callback in non blocking mode * @note This function is called when RTC_ALARM interrupt took place, inside * RTC_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 the Initialization mode */ hrtc->Instance->ISR = (uint32_t)RTC_INIT_MASK; while((hrtc->Instance->ISR & RTC_ISR_INITF) == (uint32_t)RESET) { if(counter++ == (SystemCoreClock /48U)) /* Timeout = ~ 1s */ { break; } } hrtc->Instance->DR = 0U; hrtc->Instance->TR = 0U; hrtc->Instance->ISR &= (uint32_t)~RTC_ISR_INIT; /* Enable the write protection for RTC registers */ __HAL_RTC_WRITEPROTECTION_ENABLE(hrtc); } /** * @brief This function handles RTC ALARM interrupt request. * @param None * @retval None */ void RTC_IRQHandler(void) { HAL_RTC_AlarmIRQHandler(&hRTC_Handle); } /** * @} */ /** * @} */ /************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/