96 lines
4.4 KiB
Plaintext
96 lines
4.4 KiB
Plaintext
/**
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@page USART_HardwareFlowControl_Init USART example (IT Mode with HW Flow Control)
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@verbatim
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******************************************************************************
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* @file Examples_LL/USART/USART_HardwareFlowControl_Init/readme.txt
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* @author MCD Application Team
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* @brief Description of the USART_HardwareFlowControl_Init 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 peripheral
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to receive characters asynchronously from an HyperTerminal (PC) in Interrupt mode
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with the Hardware Flow Control feature enabled. This example is based on STM32WLxx
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USART LL API. The peripheral initialization
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uses LL unitary service functions for optimization purposes (performance and size).
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USART1 Peripheral is configured in asynchronous mode (115200 bauds, 8 data bit, 1 start bit, 1 stop bit, no parity).
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HW flow control is used.
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GPIO associated to User push-button (B1) is linked with EXTI.
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Example execution:
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After startup from reset and system configuration, LED2 is blinking quickly.
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On press on User push-button (B1), USART TX Empty interrupt is enabled.
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First character of buffer to be transmitted is written into USART Transmit Data Register (TDR)
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in order to initialise transfer procedure.
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When character is sent from TDR, a TXE interrupt occurs.
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USART1 IRQ Handler routine is sending next character on USART Tx line.
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IT will be raised until last byte is to be transmitted : Then, Transmit Complete (TC) interrupt is enabled
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instead of TX Empty (TXE).
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When character is received on USART Rx line, a RXNE interrupt occurs.
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USART1 IRQ Handler routine is then checking received character value.
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On a specific value ('S' or 's'), LED2 is turned On.
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Received character is echoed on Tx line.
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In case of errors, LED2 is blinking.
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@par Keywords
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Connectivity, UART/USART, Asynchronous, RS-232, baud rate, Interrupt, HyperTerminal,
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hardware flow control, CTS/RTS, Transmitter, Receiver
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@par Directory contents
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- USART/USART_HardwareFlowControl_Init/Inc/stm32wlxx_it.h Interrupt handlers header file
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- USART/USART_HardwareFlowControl_Init/Inc/main.h Header for main.c module
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- USART/USART_HardwareFlowControl_Init/Inc/stm32_assert.h Template file to include assert_failed function
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- USART/USART_HardwareFlowControl_Init/Src/stm32wlxx_it.c Interrupt handlers
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- USART/USART_HardwareFlowControl_Init/Src/main.c Main program
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- USART/USART_HardwareFlowControl_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 STM32WLxx 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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GPIOs connected to USART1 TX/RX/CTS/RTS signals should be wired
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to corresponding pins on PC UART (could be done through a USB to UART adapter).
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- Connect STM32 MCU board USART1 TX pin (PB.06 connected to pin 35 of connector CN10)
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to PC COM port RX signal
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- Connect STM32 MCU board USART1 RX pin (PB.07 connected to pin 37 of connector CN10)
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to PC COM port TX signal
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- Connect STM32 MCU board USART1 CTS pin (PA.11 connected to pin 5 of Morpho connector CN10)
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to PC COM port RTS signal
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- Connect STM32 MCU board USART1 RTS pin (PA.12 connected to pin 3 of Morpho connector CN10)
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to PC COM port CTS 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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(115200 bauds, 8 bits data, 1 stop bit, no parity, HW flow control enabled).
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- Launch the program. Enter characters on PC communication SW side.
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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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