| /** |
| ****************************************************************************** |
| * @file stm32f2xx_hal_timebase_rtc_alarm_template.c |
| * @author MCD Application Team |
| * @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 with required prescalers value for each |
| * RTC clock source (HSE, LSE or LSI) |
| * + 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 'stm32f2xx_hal_timebase_rtc_alarm.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 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 stm32f2xx_hal_timebase_tim use is recommended for the Applications/Examples |
| requiring low power modes |
| |
| @endverbatim |
| ****************************************************************************** |
| * @attention |
| * |
| * <h2><center>© Copyright (c) 2016 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 "stm32f2xx_hal.h" |
| |
| /** @addtogroup STM32F2xx_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 */ |
| |
| #ifdef RTC_CLOCK_SOURCE_HSE |
| #define RTC_ASYNCH_PREDIV 9U |
| #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_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; |
| /* 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) * ALARM_VALUE) / RTC_CLOCK |
| HSE as RTC clock |
| Time base = ((9 + 1) * (9 + 1) * 10) / 1MHz |
| = 1ms |
| LSE as RTC clock |
| Time base = ((2 + 1) * (0 + 1) * 11) / 32.768KHz |
| = ~1ms |
| LSI as RTC clock |
| Time base = ((1 + 1) * (0 + 1) * 16) / 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 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 */ |
| { |
| status = HAL_ERROR; |
| } |
| } |
| } |
| if (status == HAL_OK) |
| { |
| /* Set alarm value for each RTC clock source */ |
| #ifdef RTC_CLOCK_SOURCE_HSE |
| hRTC_Handle.Instance->ALRMAR = 0x10U; |
| #elif defined (RTC_CLOCK_SOURCE_LSE) |
| hRTC_Handle.Instance->ALRMAR = 0x11U; |
| #else |
| hRTC_Handle.Instance->ALRMAR = 0x16U; |
| #endif |
| |
| /* 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 */ |
| { |
| status = HAL_ERROR; |
| } |
| } |
| } |
| } |
| if (status == HAL_OK) |
| { |
| 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); |
| |
| /* Enable the RTC Alarm 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 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_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 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_Alarm_IRQHandler(void) |
| { |
| HAL_RTC_AlarmIRQHandler(&hRTC_Handle); |
| } |
| |
| /** |
| * @} |
| */ |
| |
| /** |
| * @} |
| */ |
| |
| /************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/ |