76 lines
3.2 KiB
Plaintext
76 lines
3.2 KiB
Plaintext
/**
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@page USART_WakeUpFromStop USART example
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@verbatim
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******************** (C) COPYRIGHT 2016 STMicroelectronics *******************
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* @file Examples_LL/USART/USART_WakeUpFromStop/readme.txt
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* @author MCD Application Team
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* @brief Description of the USART_WakeUpFromStop USART example.
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******************************************************************************
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* @attention
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*
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* Copyright (c) 2016 STMicroelectronics.
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* All rights reserved.
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*
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* This software is licensed under terms that can be found in the LICENSE file
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* in the root directory of this software component.
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* If no LICENSE file comes with this software, it is provided AS-IS.
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*
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******************************************************************************
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@endverbatim
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@par Example Description
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Configuration of GPIO and USART peripherals to allow the characters received on USART RX pin to wake up the MCU from low-power mode.
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This example is based on the STM32F3xx USART LL API. The peripheral
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initialization uses LL unitary service functions for optimization purposes (performance and size).
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USART Peripheral is configured in asynchronous mode (9600 bauds, 8 data bit, 1 start bit, 1 stop bit, no parity).
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No HW flow control is used.
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USART Clock is based on HSI.
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Example execution:
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After startup from reset and system configuration, LED2 is blinking quickly during 3 sec,
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then MCU enters Stop mode (LED2 off).
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On first character reception by the USART from PC Com port (ex: using HyperTerminal)
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after Stop Mode period, MCU wakes up from Stop Mode.
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Received character value is checked :
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- On a specific value ('S' or 's'), LED2 is turned On and program ends.
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- If different from 'S' or 's', program performs a quick LED2 blinks during 3 sec and
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enters again Stop mode, waiting for next character to wake up.
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In case of errors, LED2 is slowly blinking (1 sec period).
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@par Directory contents
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- USART/USART_WakeUpFromStop/Inc/stm32f3xx_it.h Interrupt handlers header file
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- USART/USART_WakeUpFromStop/Inc/main.h Header for main.c module
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- USART/USART_WakeUpFromStop/Inc/stm32_assert.h Template file to include assert_failed function
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- USART/USART_WakeUpFromStop/Src/stm32f3xx_it.c Interrupt handlers
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- USART/USART_WakeUpFromStop/Src/main.c Main program
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- USART/USART_WakeUpFromStop/Src/system_stm32f3xx.c STM32F3xx system source file
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@par Hardware and Software environment
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- This example runs on STM32F334R8 devices.
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- This example has been tested with STM32F334R8-Nucleo Rev C board and can be
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easily tailored to any other supported device and development board.
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- STM32F334R8-Nucleo Rev C Set-up
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- Connect STM32 MCU board USART1 TX pin (GPIO PA9 connected to pin 21 of CN10 connector)
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to PC COM port RX signal
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- Connect STM32 MCU board USART1 RX pin (GPIO PA10 connected to pin 33 of CN10 connector)
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to PC COM port TX signal
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- Connect STM32 MCU board GND to PC COM port GND signal
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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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*/
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