/** ****************************************************************************** * @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 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 stm32f1xx_hal_timebase_tim use is recommended for the Applications/Examples requiring low power modes @endverbatim ****************************************************************************** * @attention * *

© Copyright (c) 2017 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 "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; 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; PeriphClkInitStruct.RTCClockSelection = RCC_RTCCLKSOURCE_HSE_DIV128; #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(); /* Configure RTC time base to 10Khz */ hRTC_Handle.Instance = RTC; hRTC_Handle.Init.AsynchPrediv = (HAL_RCCEx_GetPeriphCLKFreq(RCC_PERIPHCLK_RTC) / 10000) - 1; hRTC_Handle.Init.OutPut = RTC_OUTPUTSOURCE_NONE; status = HAL_RTC_Init(&hRTC_Handle); } } if (status == HAL_OK) { /* 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 */ { status = HAL_ERROR; } } } if (status == HAL_OK) { /* 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 */ { status = HAL_ERROR; } } } if (status == HAL_OK) { /* Enable the RTC global Interrupt */ HAL_NVIC_EnableIRQ(RTC_Alarm_IRQn); /* Configure the SysTick IRQ priority */ if (TickPriority < (1UL << __NVIC_PRIO_BITS)) { HAL_NVIC_SetPriority(RTC_Alarm_IRQn, TickPriority ,0U); uwTickPrio = TickPriority; } else { status = HAL_ERROR; } } return status; } /** * @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****/