147 lines
6.7 KiB
Plaintext
147 lines
6.7 KiB
Plaintext
/**
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@page UART_HyperTerminal_IT UART Hyperterminal IT example (HAL/LL mixed usage example)
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@verbatim
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******************************************************************************
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* @file UART/UART_HyperTerminal_IT/readme.txt
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* @author MCD Application Team
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* @brief Description of the UART HAL/LL mixed Hyperterminal 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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Use of a UART to transmit data (transmit/receive)
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between a board and an HyperTerminal PC application in Interrupt mode. This example
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describes how to use the USART peripheral through the STM32WLxx UART HAL
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and LL API, the LL API being used for performance improvement.
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Board: NUCLEO-WL55JC RevC
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Tx Pin: PA.02 (available through ST-Link)
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Rx Pin: PA.03 (available through ST-Link)
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_________________________
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| ______________| _______________
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| |USART2 | | HyperTerminal |
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| | | | |
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| | TX |______________________|RX |
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| | | | |
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| | | Virtual Com Port | |
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| | | | |
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| | RX |______________________|TX |
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| | | | |
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| |______________| |_______________|
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|_STM32_Board_____________|
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At the beginning of the main program the HAL_Init() function is called to reset
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all the peripherals, initialize the Flash interface and the systick.
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Then the SystemClock_Config() function is used to configure the system
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clock (SYSCLK) to run at 48 MHz for STM32WLxx Devices.
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The UART peripheral configuration is ensured by the HAL_UART_Init() function.
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This later is calling the HAL_UART_MspInit() function which core is implementing
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the configuration of the needed UART resources according to the used hardware.
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You may update this function to change UART configuration.
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The UART/Hyperterminal communication is then initiated.
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Receive and Transmit functions which allow respectively
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the reception of Data from Hyperterminal and the transmission of a predefined data
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buffer, are implemented using LL USART API.
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The Asynchronous communication aspect of the UART is clearly highlighted as the
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data buffers transmission/reception to/from Hyperterminal are done simultaneously.
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For this example the TX buffer (aTxStartMessage) is predefined and the RX buffer (aRxBuffer)
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size is limited to 10 data by the mean of the RXBUFFERSIZE define in the main.c file.
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In a first step the received data will be stored in the RX buffer and the
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TX buffer content will be displayed in the Hyperterminal interface.
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In a second step the received data in the RX buffer will be sent back to
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Hyperterminal and displayed.
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STM32 Nucleo board's LEDs can be used to monitor the transfer status:
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- LED2 is ON when transmission/reception of 10 characters is complete.
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- LED1 is ON when the reception process is complete.
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- LED3 is ON when there is an error in transmission/reception process.
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- LED3 toggles when there another error is detected.
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The UART is configured as follows:
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- BaudRate = 9600 baud
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- Word Length = 8 Bits (7 data bit + 1 parity bit)
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- One Stop Bit
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- Odd parity
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- Hardware flow control disabled (RTS and CTS signals)
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- Reception and transmission are enabled in the time
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@note When the parity is enabled, the computed parity is inserted at the MSB
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position of the transmitted data.
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@note Care must be taken when using HAL_Delay(), this function provides accurate delay (in milliseconds)
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based on variable incremented in SysTick ISR. This implies that if HAL_Delay() is called from
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a peripheral ISR process, then the SysTick interrupt must have higher priority (numerically lower)
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than the peripheral interrupt. Otherwise the caller ISR process will be blocked.
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To change the SysTick interrupt priority you have to use HAL_NVIC_SetPriority() function.
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@note The application needs to ensure that the SysTick time base is always set to 1 millisecond
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to have correct HAL operation.
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@par Keywords
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Connectivity, UART/USART, baud rate, RS-232, HyperTerminal, full-duplex, Interrupt
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Transmitter, Receiver, Asynchronous
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@par Directory contents
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- UART/UART_Hyperterminal_IT/Inc/stm32wlxx_hal_conf.h HAL configuration file
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- UART/UART_Hyperterminal_IT/Inc/stm32wlxx_it.h IT interrupt handlers header file
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- UART/UART_Hyperterminal_IT/Inc/main.h Main program header file
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- UART/UART_Hyperterminal_IT/Src/stm32wlxx_it.c IT interrupt handlers
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- UART/UART_Hyperterminal_IT/Src/main.c Main program
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- UART/UART_Hyperterminal_IT/Src/stm32wlxx_hal_msp.c HAL MSP file
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- UART/UART_Hyperterminal_IT/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 STMicroelectronics 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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Example is delivered for using Virtual Com port feature of STLINK for connection between NUCLEO-WL55JC RevC and PC,
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Please ensure that USART communication between the target MCU and ST-LINK MCU is properly enabled
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on HW board in order to support Virtual Com Port (Default HW SB configuration allows use of VCP)
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GPIOs connected to USART2 TX/RX (PA2 and PA3) are automatically mapped
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on RX and TX pins of PC UART Com port selected on PC side (please ensure VCP com port is selected).
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- Launch serial communication SW on PC (as HyperTerminal or TeraTerm) with proper configuration
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- Word Length = 7 Bits
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- One Stop Bit
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- Odd parity
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- BaudRate = 9600 baud
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- Flow control: None
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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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