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82 lines
3.9 KiB
Plaintext
82 lines
3.9 KiB
Plaintext
/**
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@page WWDG_RefreshUntilUserEvent WWDG example
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@verbatim
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******************** (C) COPYRIGHT 2017 STMicroelectronics *******************
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* @file Examples_LL/WWDG/WWDG_RefreshUntilUserEvent/readme.txt
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* @author MCD Application Team
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* @brief Description of the WWDG_RefreshUntilUserEvent example.
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******************************************************************************
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*
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* Redistribution and use in source and binary forms, with or without modification,
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* are permitted provided that the following conditions are met:
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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* 3. Neither the name of STMicroelectronics nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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******************************************************************************
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@endverbatim
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@par Example Description
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This example describes how to configure the WWDG, periodically update the counter,
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and generate an MCU WWDG reset when a user button is pressed. Peripheral initialization
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is done using LL unitary services functions for optimization purpose (performance and size).
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Example Configuration:
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Configure the WWDG (Window, Prescaler & Counter) and enable it.
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Refresh the WWDG downcounter in the main loop - LED2 is blinking fastly & continuously
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Example Execution:
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When User Button is pressed, the Downcounter automatic refresh mechanism is disable and thus, reset will occur.
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After a reset when re-entering in the main, RCC WWDG Reset Flag will be checked and if we are back from a WWDG reset the LED2 will be switch ON.
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Waiting a new user button pressed to re-activate the WWDG
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@par Keywords
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System, WWDG, Timeout, Refresh, Counter update, MCU Reset, Downcounter, Event, Window
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@par Directory contents
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- WWDG/WWDG_RefreshUntilUserEvent/Inc/stm32f4xx_it.h Interrupt handlers header file
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- WWDG/WWDG_RefreshUntilUserEvent/Inc/main.h Header for main.c module
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- WWDG/WWDG_RefreshUntilUserEvent/Inc/stm32_assert.h Template file to include assert_failed function
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- WWDG/WWDG_RefreshUntilUserEvent/Src/stm32f4xx_it.c Interrupt handlers
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- WWDG/WWDG_RefreshUntilUserEvent/Src/main.c Main program
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- WWDG/WWDG_RefreshUntilUserEvent/Src/system_stm32f4xx.c STM32F4xx system source file
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@par Hardware and Software environment
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- This example runs on STM32F411xx devices.
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- This example has been tested with NUCLEO-F411RE board and can be
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easily tailored to any other supported device 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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