/**
@page PWR_LPRUN Low Power Run Mode Example
@verbatim
******************************************************************************
* @file PWR/PWR_LPRUN/readme.txt
* @author MCD Application Team
* @brief Description of the Low Power Run Mode example.
******************************************************************************
*
* Copyright (c) 2020 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 and exit the Low-power run mode.
In the associated software, the system clock is set to 48 MHz.
The SysTick is programmed to generate an interrupt each 1 ms.
The User push-button (B1) can be pressed at any time to exit from Low Power Run.
The software then comes back in Run mode for 5 sec. before automatically
entering LP Run mode again.
LED2 is used to monitor the system state as follows:
- LED2 toggling : system in Run mode
- LED2 off : system in LP Run mode
- LED2 on : system in error
These steps are repeated in an infinite loop.
@note This example can not be used in DEBUG mode 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 needs to ensure that the SysTick time base is always set to 1 millisecond
to have correct HAL operation.
@par Keywords
Power, PWR, Low Power, Run mode, Interrupt, EXTI, Wakeup, External reset
@par Directory contents
- PWR/PWR_LPRUN/Inc/stm32wlxx_nucleo_conf.h BSP configuration file
- PWR/PWR_LPRUN/Inc/stm32wlxx_conf.h HAL Configuration file
- PWR/PWR_LPRUN/Inc/stm32wlxx_it.h Header for stm32wlxx_it.c
- PWR/PWR_LPRUN/Inc/main.h Header file for main.c
- PWR/PWR_LPRUN/Src/system_stm32wlxx.c STM32WLxx system clock configuration file
- PWR/PWR_LPRUN/Src/stm32wlxx_it.c Interrupt handlers
- PWR/PWR_LPRUN/Src/stm32wlxx_hal_msp.c HAL MSP module
- PWR/PWR_LPRUN/Src/main.c Main program
@par Hardware and Software environment
- This example runs on STM32WLxx devices
- This example has been tested with STMicroelectronics NUCLEO-WL55JC RevC
board and can be easily tailored to any other supported device
and development board.
- NUCLEO-WL55JC RevC set-up:
- LED2 connected to PB.09 pin
- Use the User push-button (B1) connected to pin PA.00.
@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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