/**
  @page USART_USART_Printf USART Printf example 
  
  @verbatim
  ******************** (C) COPYRIGHT 2013 STMicroelectronics *******************
  * @file    USART/USART_Printf/readme.txt 
  * @author  MCD Application Team
  * @version V1.3.0
  * @date    13-November-2013
  * @brief   Description of the USART Printf example.
  ******************************************************************************
  *
  * Licensed under MCD-ST Liberty SW License Agreement V2, (the "License");
  * You may not use this file except in compliance with the License.
  * You may obtain a copy of the License at:
  *
  *        http://www.st.com/software_license_agreement_liberty_v2
  *
  * Unless required by applicable law or agreed to in writing, software 
  * distributed under the License is distributed on an "AS IS" BASIS, 
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  *
  ******************************************************************************
  @endverbatim

@par Example Description 

This example shows how to retarget the C library printf function to the USART. 
This implementation output the printf message on the Hyperterminal using USART.

The USARTx is configured as follows:
    - BaudRate = 115200 baud  
    - Word Length = 8 Bits
    - One Stop Bit
    - No parity
    - Hardware flow control disabled (RTS and CTS signals)
    - Receive and transmit enabled


@par Directory contents 
  
  - USART/USART_Printf/system_stm32f4xx.c   STM32F4xx system clock configuration file
  - USART/USART_Printf/stm32f4xx_conf.h     Library Configuration file
  - USART/USART_Printf/stm32f4xx_it.c       Interrupt handlers
  - USART/USART_Printf/stm32f4xx_it.h       Interrupt handlers header file
  - USART/USART_Printf/main.c               Main program
  - USART/USART_Printf/main.h               Main program header file
  
     
@par Hardware and Software environment
  
  - This example runs on STM32F405xx/407xx, STM32F415xx/417xx, STM32F427xx/437xx and 
    STM32F429xx/439xx devices.
    
  - This example has been tested with STMicroelectronics STM324xG-EVAL (STM32F40xx/
    STM32F41xx Devices), STM32437I-EVAL (STM32F427xx/STM32F437xx Devices) and 
    STM324x9I-EVAL RevB (STM32F429xx/STM32F439xx Devices) evaluation boards and 
    can be easily tailored to any other supported device and development board.

  - STM324xG-EVAL and STM32437I-EVAL Set-up 
    - Connect a null-modem female/female RS232 cable between the DB9 connector 
      CN16 (USART3) and PC serial port if you want to display data on the HyperTerminal.
      @note Make sure that jumper JP22 is in position 1-2
      
  - STM324x9I-EVAL RevB Set-up 
    - Connect a null-modem female/female RS232 cable between the DB9 connector 
      CN8 (USART1) and PC serial port if you want to display data on the HyperTerminal.
      @note Make sure that jumper JP7 is in position 1-2
 
  - Hyperterminal configuration:
    - Word Length = 8 Bits
    - One Stop Bit
    - No parity
    - BaudRate = 115200 baud
    - flow control: None 


@par How to use it ? 

In order to make the program work, you must do the following:
 - Copy all source files from this example folder to the template folder under
   Project\STM32F4xx_StdPeriph_Templates
 - Open your preferred toolchain 
 - Select the project workspace related to the used device 
   - If "STM32F40_41xxx" is selected as default project Add the following files in the project source list:
     - Utilities\STM32_EVAL\STM3240_41_G_EVAL\stm324xg_eval.c
           
   - If "STM32F427_437xx" is selected as default project Add the following files in the project source list:
     - Utilities\STM32_EVAL\STM324x7I_EVAL\stm324x7i_eval.c
          
   - If "STM32F429_439xx" is selected as default project Add the following files in the project source list:
     - Utilities\STM32_EVAL\STM324x9I_EVAL\stm324x9i_eval.c
                 
 - Rebuild all files and load your image into target memory
 - Run the example
  
 * <h3><center>&copy; COPYRIGHT STMicroelectronics</center></h3>
 */
