149 lines
7.0 KiB
Plaintext
149 lines
7.0 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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******************** (C) COPYRIGHT 2016 STMicroelectronics *******************
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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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* @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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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 STM32F1xx UART HAL
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and LL API, the LL API being used for performance improvement.
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Board: STM32F103RB-Nucleo
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Tx Pin: PA.02
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Rx Pin: PA.03
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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 72 MHz for STM32F1xx 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 TxBuffer is predefined and the RxBuffer size is limited to
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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 RxBuffer buffer and the
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TxBuffer buffer content will be displayed in the Hyperterminal interface.
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In a second step the received data in the RxBuffer 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 toggles when the transmission process is complete.
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- LED2 stays ON when the reception process is complete.
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- LED2 is OFF when there is an error in transmission/reception process.
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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 USARTx/UARTx instance used and associated resources can be updated in "main.h"
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file depending hardware configuration used.
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For example, current example is provided in a configuration based on Virtual Com Port use (USART2).
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Another USART instance could be used, assuming corresponding TX and RX pins are properly wired
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to PC Com port (updates to be done accordinlgy in main.h).
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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 Directory contents
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- UART/UART_Hyperterminal_IT/Inc/stm32f1xx_hal_conf.h HAL configuration file
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- UART/UART_Hyperterminal_IT/Inc/stm32f1xx_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/stm32f1xx_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/stm32f1xx_hal_msp.c HAL MSP file
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- UART/UART_Hyperterminal_IT/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 STMicroelectronics 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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Example is delivered for using Virtual Com port feature of STLINK for connection between STM32F103RB-Nucleo 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 (PA.02 and PA.03) 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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*/
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