122 lines
5.6 KiB
Plaintext
122 lines
5.6 KiB
Plaintext
/**
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@page UART_Printf UART Printf example
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@verbatim
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******************** (C) COPYRIGHT 2017 STMicroelectronics *******************
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* @file UART/UART_Printf/readme.txt
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* @author MCD Application Team
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* @brief Description of the UART Printf example.
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******************************************************************************
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*
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* Redistribution and use in source and binary forms, with or without modification,
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* are permitted provided that the following conditions are met:
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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* 3. Neither the name of STMicroelectronics nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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******************************************************************************
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@endverbatim
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@par Example Description
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This example shows how to reroute the C library printf function to the UART. It
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outputs a message sent by the UART on the HyperTerminal.
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_________________________
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| ______________| _______________
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| |USART1 | | Hyperterminal |
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| | TX(PA9)|______________________|RX |
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| | | RS232 Cable | |
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| | RX(PA10)|______________________|TX |
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| |______________| |_______________|
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|_STM324x9I_______________|
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This implementation output the printf message on the Hyperterminal using USART1.
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The USART1 is configured as follows:
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- BaudRate = 9600 baud
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- Word Length = 8 Bits
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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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- Receive and transmit enabled
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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, Printf, Baud rate, RS-232, HyperTerminal, full-duplex
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@par Directory contents
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- UART/UART_Printf/Inc/stm32f4xx_hal_conf.h HAL configuration file
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- UART/UART_Printf/Inc/stm32f4xx_it.h Interrupt handlers header file
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- UART/UART_Printf/Inc/main.h Main program header file
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- UART/UART_Printf/Src/stm32f4xx_it.c Interrupt handlers
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- UART/UART_Printf/Src/main.c Main program
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- UART/UART_Printf/Src/stm32f4xx_hal_msp.c HAL MSP module
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- UART/UART_Printf/Src/system_stm32f4xx.c STM32F4xx system clock configuration file
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@par Hardware and Software environment
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- This example runs on STM32F42xxx/STM32F43xxx devices
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- This example has been tested with STM324x9I-EVAL RevB evaluation board and can be
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easily tailored to any other supported device and development board.
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- STM324x9I-EVAL RevB Set-up
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- Connect a null-modem female/female RS232 cable between the DB9 connector
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CN8 (USART1) and PC serial port if you want to display data on the Hyperterminal.
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- Please ensure that jumper JP7 is in position RS232_RX
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- Hyperterminal 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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