186 lines
5.7 KiB
C
186 lines
5.7 KiB
C
/**
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******************************************************************************
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* @file stm32f2xx_hal_pwr_ex.c
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* @author MCD Application Team
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* @brief Extended PWR HAL module driver.
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* This file provides firmware functions to manage the following
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* functionalities of PWR extension peripheral:
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* + Peripheral Extended features functions
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*
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******************************************************************************
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* @attention
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*
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* <h2><center>© Copyright (c) 2017 STMicroelectronics.
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* All rights reserved.</center></h2>
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*
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* This software component is licensed by ST under BSD 3-Clause license,
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* the "License"; You may not use this file except in compliance with the
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* License. You may obtain a copy of the License at:
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* opensource.org/licenses/BSD-3-Clause
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*
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******************************************************************************
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*/
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/* Includes ------------------------------------------------------------------*/
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#include "stm32f2xx_hal.h"
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/** @addtogroup STM32F2xx_HAL_Driver
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* @{
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*/
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/** @defgroup PWREx PWREx
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* @brief PWR HAL module driver
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* @{
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*/
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#ifdef HAL_PWR_MODULE_ENABLED
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/* Private typedef -----------------------------------------------------------*/
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/* Private define ------------------------------------------------------------*/
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/** @addtogroup PWREx_Private_Constants
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* @{
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*/
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#define PWR_BKPREG_TIMEOUT_VALUE 1000U
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/**
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* @}
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*/
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/* Private macro -------------------------------------------------------------*/
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/* Private variables ---------------------------------------------------------*/
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/* Private function prototypes -----------------------------------------------*/
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/* Private functions ---------------------------------------------------------*/
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/** @defgroup PWREx_Exported_Functions PWR Exported Functions
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* @{
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*/
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/** @defgroup PWREx_Exported_Functions_Group1 Peripheral Extended features functions
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* @brief Peripheral Extended features functions
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*
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@verbatim
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===============================================================================
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##### Peripheral extended features functions #####
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===============================================================================
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*** Main and Backup Regulators configuration ***
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================================================
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[..]
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(+) The backup domain includes 4 Kbytes of backup SRAM accessible only from
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the CPU, and address in 32-bit, 16-bit or 8-bit mode. Its content is
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retained even in Standby or VBAT mode when the low power backup regulator
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is enabled. It can be considered as an internal EEPROM when VBAT is
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always present. You can use the HAL_PWREx_EnableBkUpReg() function to
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enable the low power backup regulator.
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(+) When the backup domain is supplied by VDD (analog switch connected to VDD)
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the backup SRAM is powered from VDD which replaces the VBAT power supply to
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save battery life.
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(+) The backup SRAM is not mass erased by a tamper event. It is read
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protected to prevent confidential data, such as cryptographic private
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key, from being accessed. The backup SRAM can be erased only through
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the Flash interface when a protection level change from level 1 to
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level 0 is requested.
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-@- Refer to the description of Read protection (RDP) in the Flash
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programming manual.
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Refer to the product datasheets for more details.
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*** FLASH Power Down configuration ****
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=======================================
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[..]
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(+) By setting the FPDS bit in the PWR_CR register by using the
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HAL_PWREx_EnableFlashPowerDown() function, the Flash memory also enters power
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down mode when the device enters Stop mode. When the Flash memory
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is in power down mode, an additional startup delay is incurred when
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waking up from Stop mode.
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@endverbatim
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* @{
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*/
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/**
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* @brief Enables the Backup Regulator.
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* @retval HAL status
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*/
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HAL_StatusTypeDef HAL_PWREx_EnableBkUpReg(void)
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{
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uint32_t tickstart = 0U;
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*(__IO uint32_t *) CSR_BRE_BB = (uint32_t)ENABLE;
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/* Get tick */
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tickstart = HAL_GetTick();
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/* Wait till Backup regulator ready flag is set */
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while(__HAL_PWR_GET_FLAG(PWR_FLAG_BRR) == RESET)
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{
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if((HAL_GetTick() - tickstart ) > PWR_BKPREG_TIMEOUT_VALUE)
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{
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return HAL_TIMEOUT;
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}
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}
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return HAL_OK;
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}
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/**
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* @brief Disables the Backup Regulator.
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* @retval HAL status
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*/
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HAL_StatusTypeDef HAL_PWREx_DisableBkUpReg(void)
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{
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uint32_t tickstart = 0U;
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*(__IO uint32_t *) CSR_BRE_BB = (uint32_t)DISABLE;
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/* Get tick */
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tickstart = HAL_GetTick();
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/* Wait till Backup regulator ready flag is set */
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while(__HAL_PWR_GET_FLAG(PWR_FLAG_BRR) != RESET)
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{
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if((HAL_GetTick() - tickstart ) > PWR_BKPREG_TIMEOUT_VALUE)
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{
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return HAL_TIMEOUT;
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}
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}
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return HAL_OK;
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}
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/**
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* @brief Enables the Flash Power Down in Stop mode.
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* @retval None
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*/
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void HAL_PWREx_EnableFlashPowerDown(void)
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{
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*(__IO uint32_t *) CR_FPDS_BB = (uint32_t)ENABLE;
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}
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/**
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* @brief Disables the Flash Power Down in Stop mode.
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* @retval None
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*/
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void HAL_PWREx_DisableFlashPowerDown(void)
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{
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*(__IO uint32_t *) CR_FPDS_BB = (uint32_t)DISABLE;
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}
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/**
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* @}
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*/
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/**
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* @}
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*/
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#endif /* HAL_PWR_MODULE_ENABLED */
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/**
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* @}
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*/
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/**
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* @}
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*/
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/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
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