92 lines
4.1 KiB
Plaintext
92 lines
4.1 KiB
Plaintext
/**
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@page USART_HardwareFlowControl USART example (IT Mode with HW Flow Control)
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@verbatim
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******************** (C) COPYRIGHT 2016 STMicroelectronics *******************
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* @file Examples_LL/USART/USART_HardwareFlowControl/readme.txt
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* @author MCD Application Team
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* @brief Description of the USART_HardwareFlowControl 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 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 STM32F1xx
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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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USART 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 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 push button , USART TX Empty interrupt is enabled.
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First character of buffer to be transmitted is written into USART Transmit Data Register (DR)
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in order to initialise transfer procedure.
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When character is sent from DR, a TXE interrupt occurs.
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USART 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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USART 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 Directory contents
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- USART/USART_HardwareFlowControl/Inc/stm32f1xx_it.h Interrupt handlers header file
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- USART/USART_HardwareFlowControl/Inc/main.h Header for main.c module
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- USART/USART_HardwareFlowControl/Inc/stm32_assert.h Template file to include assert_failed function
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- USART/USART_HardwareFlowControl/Src/stm32f1xx_it.c Interrupt handlers
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- USART/USART_HardwareFlowControl/Src/main.c Main program
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- USART/USART_HardwareFlowControl/Src/system_stm32f1xx.c STM32F1xx system source file
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@par Hardware and Software environment
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- This example runs on STM32F103xB devices.
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- This example has been tested with STM32F103RB-Nucleo board and can be
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easily tailored to any other supported device and development board.
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- STM32F103RB-Nucleo 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 (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 USART1 RTS pin (GPIO PA12 connected to pin 12 of CN10 connector)
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to PC COM port CTS signal
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- Connect STM32 MCU board USART1 CTS pin (GPIO PA11 connected to pin 14 of CN10 connector)
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to PC COM port RTS 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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*/
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