84 lines
3.6 KiB
Plaintext
84 lines
3.6 KiB
Plaintext
/**
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@page LPUART_WakeUpFromStop2_Init LPUART example
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@verbatim
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******************************************************************************
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* @file Examples_LL/LPUART/LPUART_WakeUpFromStop2_Init/readme.txt
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* @author MCD Application Team
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* @brief Description of the LPUART_WakeUpFromStop2_Init LPUART example.
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******************************************************************************
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*
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* Copyright (c) 2020 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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Configuration of GPIO and LPUART peripherals to allow characters
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received on LPUART_RX pin to wake up the MCU from low-power mode. This example is based
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on the LPUART LL API. The peripheral initialization uses LL
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initialization function to demonstrate LL init usage.
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LPUART 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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LPUART 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 2" mode (LED2 off).
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On first character reception by the LPUART from PC Com port (ex: using HyperTerminal)
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after "Stop 2" Mode period, MCU wakes up from "Stop 2" 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 2" 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 Keywords
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Connectivity, LPUART, baud rate, RS-232, HyperTerminal, full-duplex,
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Transmitter, Receiver, Asynchronous, Low Power
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@par Directory contents
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- LPUART/LPUART_WakeUpFromStop2_Init/Inc/stm32wlxx_it.h Interrupt handlers header file
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- LPUART/LPUART_WakeUpFromStop2_Init/Inc/main.h Header for main.c module
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- LPUART/LPUART_WakeUpFromStop2_Init/Inc/stm32_assert.h Template file to include assert_failed function
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- LPUART/LPUART_WakeUpFromStop2_Init/Src/stm32wlxx_it.c Interrupt handlers
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- LPUART/LPUART_WakeUpFromStop2_Init/Src/main.c Main program
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- LPUART/LPUART_WakeUpFromStop2_Init/Src/system_stm32wlxx.c STM32WLxx system source file
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@par Hardware and Software environment
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- This example runs on STM32WL55JCIx devices.
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- This example has been tested with NUCLEO-WL55JC RevC board and can be
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easily tailored to any other supported device and development board.
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- NUCLEO-WL55JC RevC Set-up
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- Connect STM32 MCU board LPUART1 TX pin (GPIO PC1 PC1 connected to pin 23 of CN10 connector)
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to PC COM port RX signal
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- Connect STM32 MCU board LPUART1 RX pin (GPIO PC0 PC0 connected to pin 14 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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- Launch serial communication SW on PC (as HyperTerminal or TeraTerm) with proper configuration
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(9600 bauds, 8 bits data, 1 stop bit, no parity, no HW flow control).
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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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