/**
@page PWR_STOP Power Stop Mode Example
@verbatim
******************** (C) COPYRIGHT 2017 STMicroelectronics *******************
* @file PWR/PWR_STOP/readme.txt
* @author MCD Application Team
* @brief Description of the Power Stop Mode example.
******************************************************************************
*
* 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
*
******************************************************************************
@endverbatim
@par Example Description
How to enter the Stop mode and wake up from this mode by using the RTC wakeup
timer event or an interrupt.
LED1 is ON during RUN mode and OFF during STOP mode.
In the associated software
- the system clock is set to 100 MHz.
- the EXTI0 is configured to generate an interrupt on falling edge.
- the SysTick is programmed to generate an interrupt each 1 ms.
The system enters STOP mode after 5s and will wait for the Joystick sel-button is pressed
to wake up from STOP mode.
Current consumption could be monitored through an ampere-meter.
After the system woken up from STOP, the clock system is reconfigured because the default clock
after wake up is the HSI.
This behavior is repeated in an infinite loop.
- STOP Mode
============
- Regulator in LP mode
- VREFINT OFF with fast wakeup enabled
- HSI as SysClk after Wake Up
- No IWDG
- Wakeup using EXTI Line (Joystick sel-button PA.00)
@note To measure the current consumption in STOP mode, please refer to
@subpage PWR_CurrentConsumption example.
@note This example can not be used in DEBUG mode, this is due to the fact
that the Cortex-M4 core is no longer clocked during low power mode
so debugging features are disabled
@note Care must be taken when using HAL_Delay(), this function provides accurate delay (in milliseconds)
based on variable incremented in SysTick ISR. This implies that if HAL_Delay() is called from
a peripheral ISR process, then the SysTick interrupt must have higher priority (numerically lower)
than the peripheral interrupt. Otherwise the caller ISR process will be blocked.
To change the SysTick interrupt priority you have to use HAL_NVIC_SetPriority() function.
@note The application need to ensure that the SysTick time base is always set to 1 millisecond
to have correct HAL operation.
@note Care must be taken when HAL_RCCEx_PeriphCLKConfig() is used to select the RTC clock source; in this
case the Backup domain will be reset in order to modify the RTC Clock source, as consequence RTC
registers (including the backup registers) and RCC_BDCR register are set to their reset values.
@par Keywords
Power, PWR, Stop mode, Interrupt, EXTI, Wakeup, Low Power, External reset,
@par Directory contents
- PWR/PWR_STOP/Inc/stm32f4xx_conf.h HAL Configuration file
- PWR/PWR_STOP/Inc/stm32f4xx_it.h Header for stm32f4xx_it.c
- PWR/PWR_STOP/Inc/main.h Header file for main.c
- PWR/PWR_STOP/Src/system_stm32f4xx.c STM32F4xx system clock configuration file
- PWR/PWR_STOP/Src/stm32f4xx_it.c Interrupt handlers
- PWR/PWR_STOP/Src/main.c Main program
- PWR/PWR_STOP/Src/stm32f4xx_hal_msp.c HAL MSP module
@par Hardware and Software environment
- STM32412G-DISCOVERY Set-up :
- Use the Joystick sel-button connected to pin PA.00 (EXTI0)
- Connect an ampere-meter to JP7 to measure the IDD current.
- This example runs on STM32F412xG devices.
- This example has been tested with STMicroelectronics STM32412G-DISCOVERY
evaluation board and can be easily tailored to any other supported device
and development board.
@par How to use it ?
In order to make the program work, you must do the following :
- Open your preferred toolchain
- Rebuild all files and load your image into target memory
- Run the example
* <h3><center>© COPYRIGHT STMicroelectronics</center></h3>
*/
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