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105 lines
4.3 KiB
Plaintext
105 lines
4.3 KiB
Plaintext
/**
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@page PWR_STOP Power Stop Mode Example
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@verbatim
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******************** (C) COPYRIGHT 2017 STMicroelectronics *******************
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* @file PWR/PWR_STOP/readme.txt
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* @author MCD Application Team
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* @brief Description of the Power Stop Mode example.
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******************************************************************************
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*
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* Copyright (c) 2017 STMicroelectronics. All rights reserved.
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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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@endverbatim
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@par Example Description
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How to enter the Stop mode and wake up from this mode by using the RTC wakeup
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timer event or an interrupt.
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LED1 is ON during RUN mode and OFF during STOP mode.
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In the associated software
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- the system clock is set to 100 MHz.
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- the EXTI_Line15_10 is configured to generate an interrupt on falling edge.
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- the SysTick is programmed to generate an interrupt each 1 ms.
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The system enters STOP mode after 5s and will wait for the User push-button is pressed
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to wake up from STOP mode.
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Current consumption could be monitored through an ampere-meter.
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After the system woken up from STOP, the clock system is reconfigured because the default clock
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after wake up is the HSI.
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This behavior is repeated in an infinite loop.
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- STOP Mode
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============
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- Regulator in LP mode
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- VREFINT OFF with fast wakeup enabled
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- HSI as SysClk after Wake Up
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- No IWDG
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- Wakeup using EXTI Line (User push-button PC.13)
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@note To measure the current consumption in STOP mode, please refer to
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@subpage PWR_CurrentConsumption example.
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@note This example can not be used in DEBUG mode, this is due to the fact
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that the Cortex-M4 core is no longer clocked during low power mode
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so debugging features are disabled
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@note Care must be taken when using HAL_Delay(), this function provides accurate delay (in milliseconds)
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based on variable incremented in SysTick ISR. This implies that if HAL_Delay() is called from
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a peripheral ISR process, then the SysTick interrupt must have higher priority (numerically lower)
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than the peripheral interrupt. Otherwise the caller ISR process will be blocked.
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To change the SysTick interrupt priority you have to use HAL_NVIC_SetPriority() function.
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@note The application need to ensure that the SysTick time base is always set to 1 millisecond
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to have correct HAL operation.
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@note Care must be taken when HAL_RCCEx_PeriphCLKConfig() is used to select the RTC clock source; in this
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case the Backup domain will be reset in order to modify the RTC Clock source, as consequence RTC
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registers (including the backup registers) and RCC_BDCR register are set to their reset values.
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@par Keywords
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Power, PWR, Stop mode, Interrupt, EXTI, Wakeup, Low Power, External reset
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@par Directory contents
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- PWR/PWR_STOP/Inc/stm32f4xx_conf.h HAL Configuration file
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- PWR/PWR_STOP/Inc/stm32f4xx_it.h Header for stm32f4xx_it.c
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- PWR/PWR_STOP/Inc/main.h Header file for main.c
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- PWR/PWR_STOP/Src/system_stm32f4xx.c STM32F4xx system clock configuration file
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- PWR/PWR_STOP/Src/stm32f4xx_it.c Interrupt handlers
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- PWR/PWR_STOP/Src/main.c Main program
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- PWR/PWR_STOP/Src/stm32f4xx_hal_msp.c HAL MSP module
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@par Hardware and Software environment
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- NUCLEO-F412ZG Rev B Set-up :
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- Use the User push-button connected to pin PC.13 (EXTI_Line15_10)
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- Connect an ampere-meter to JP5 to measure the IDD current.
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- This example runs on STM32F412Zx devices.
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- This example has been tested with STMicroelectronics NUCLEO-F412ZG Rev B
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board and can be easily tailored to any other supported device
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and development board.
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@par How to use it ?
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In order to make the program work, you must do the following :
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- Open your preferred toolchain
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- Rebuild all files and load your image into target memory
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- Run the example
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* <h3><center>© COPYRIGHT STMicroelectronics</center></h3>
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*/
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