STM32CubeF4

/**
  @page UART_Printf UART Printf example
  
  @verbatim
  ******************** (C) COPYRIGHT 2017 STMicroelectronics *******************
  * @file    UART/UART_Printf/readme.txt 
  * @author  MCD Application Team
  * @brief   Description of the UART Printf example.
  ******************************************************************************
  *
  * Copyright (c) 2017 STMicroelectronics. All rights reserved.
  *
  * This software component is licensed by ST under BSD 3-Clause license,
  * the "License"; You may not use this file except in compliance with the
  * License. You may obtain a copy of the License at:
  *                       opensource.org/licenses/BSD-3-Clause
  *
  ******************************************************************************
   @endverbatim

@par Example Description 

This example shows how to re-route the C library printf function to the UART.
The UART outputs a message on the HyperTerminal.

Board: STM32469I-EVAL
Tx Pin: PA.09
Rx Pin: PA.10
   _________________________ 
  |           ______________|                       _______________
  |          |USART         |                      | HyperTerminal |
  |          |              |                      |               |
  |          |           TX |______________________|RX             |
  |          |              |                      |               |
  |          |              |     RS232 Cable      |               |             
  |          |              |                      |               |
  |          |           RX |______________________|TX             |          
  |          |              |                      |               |           
  |          |______________|                      |_______________|          
  |                         |                       
  |                         |                    
  |                         |                      
  |                         |                      
  |_STM32_Board_____________|                      


The USART is configured as follows:
    - BaudRate = 9600 baud  
    - Word Length = 8 Bits (7 data bit + 1 parity bit)
    - One Stop Bit
    - Odd parity
    - Hardware flow control disabled (RTS and CTS signals)
    - Reception and transmission are enabled in the time

@note USARTx/UARTx instance used and associated resources can be updated in "main.h"
file depending hardware configuration used.

@note When the parity is enabled, the computed parity is inserted at the MSB
position of the transmitted data.

@note Care must be taken when using HAL_Delay(), this function provides accurate delay (in milliseconds)
      based on variable incremented in SysTick ISR. This implies that if HAL_Delay() is called from
      a peripheral ISR process, then the SysTick interrupt must have higher priority (numerically lower)
      than the peripheral interrupt. Otherwise the caller ISR process will be blocked.
      To change the SysTick interrupt priority you have to use HAL_NVIC_SetPriority() function.
      
@note The application needs to ensure that the SysTick time base is always set to 1 millisecond
      to have correct HAL operation.

@note The connection of the LCD reset pin to a dedicated GPIO PK7 instead of the STM32F469 NRST pin may cause residual display on LCD with applications/examples that do not require display.
	  The LCD clear can be ensured by hardware through the board's power off/power on or by software calling the BSP_LCD_Reset() function.

@par Keywords

Connectivity, UART, Printf, Baud rate, RS-232, HyperTerminal, full-duplex

@par Directory contents 

  - UART/UART_Printf/Inc/stm32f4xx_hal_conf.h    HAL configuration file
  - UART/UART_Printf/Inc/stm32f4xx_it.h          IT interrupt handlers header file
  - UART/UART_Printf/Inc/main.h                  Header for main.c module  
  - UART/UART_Printf/Src/stm32f4xx_it.c          Interrupt handlers
  - UART/UART_Printf/Src/main.c                  Main program
  - UART/UART_Printf/Src/stm32f4xx_hal_msp.c     HAL MSP module
  - UART/UART_Printf/Src/system_stm32f4xx.c      STM32F4xx system source file


@par Hardware and Software environment

  - This example runs on STM32F469xx/STM32F479xx devices.

  - This example has been tested and validated with STMicroelectronics STM32469I-EVAL RevC board and can be
    easily tailored to any other supported device and development board.    

  - TARGET_STM32469I_EVAL Set-up
  - Connect a null-modem female/female RS232 cable between the DB9 connector CN7 (USART1) 
  and PC serial port on which you want to display data on the HyperTerminal.
  @note Make sure that :
    - jumper JP8  is on RS232_RX position (1-2)  and 
    - jumper JP15 is on USART1_RX position 1-2)and 
    - jumper JP19 is on USART1_TX position (1-2).      

  - Hyperterminal configuration:
    - Data Length = 7 Bits
    - One Stop Bit
    - Odd parity
    - BaudRate = 9600 baud
    - Flow control: None 

@par How to use it ? 

In order to make the program work, you must do the following :
 - Open your preferred toolchain 
 - Rebuild all files and load your image into target memory
 - Run the example


 * <h3><center>&copy; COPYRIGHT STMicroelectronics</center></h3>
 */