/**
  @page USART_Printf USART Printf example
  
  @verbatim
  ******************** (C) COPYRIGHT 2012 STMicroelectronics *******************
  * @file    USART/Printf/readme.txt 
  * @author  MCD Application Team
  * @version V1.1.1
  * @date    13-April-2012
  * @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  USART3 
(EVAL_COM1).

The USARTx is configured as follow:
    - 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/Printf/stm32l1xx_conf.h     Library Configuration file
  - USART/Printf/stm32l1xx_it.h       Interrupt handlers header file
  - USART/Printf/stm32l1xx_it.c       Interrupt handlers
  - USART/Printf/main.c               Main program
  - USART/Printf/system_stm32l1xx.c   STM32L1xx system source file

@note The "system_stm32l1xx.c" is generated by an automatic clock configuration 
      system and can be easily customized to your own configuration. 
      To select different clock setup, use the "STM32L1xx_Clock_Configuration_V1.1.0.xls" 
      provided with the AN3309 package available on <a href="http://www.st.com/internet/mcu/family/141.jsp">  ST Microcontrollers </a>
         
@par Hardware and Software environment

  - This example runs on STM32L1xx Ultra Low Power High-, Medium-Density and Medium-Density Plus Devices.
  
  - This example has been tested with STMicroelectronics STM32L152D-EVAL (STM32L1xx 
    Ultra Low Power High-Density) and STM32L152-EVAL (STM32L1xx Ultra Low 
    Power Medium-Density) evaluation board and can be easily tailored to any 
    other supported device and development board.

  - STM32L152D-EVAL Set-up
    - USART1 (EVAL_COM1)  
       - Connect a null-modem female/female RS232 cable between the DB9 connector 
         CN1(when USART1 (EVAL_COM1) is used) and PC serial port.
       
  - STM32L152-EVAL Set-up
    - USART2 (EVAL_COM1)  
       - Connect a null-modem female/female RS232 cable between the DB9 connector 
         CN2(when USART2 (EVAL_COM1) is used) and PC serial port.
       - Make sure that JP9 is open and JP5 is in position 2<->3
    - USART3 (EVAL_COM2)  
       - Connect a null-modem female/female RS232 cable between the DB9 connector 
         CN5(when USART3 (EVAL_COM2) is used) and PC serial port.
       - Make sure that JP7 and JP8 are 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\STM32L1xx_StdPeriph_Templates
 - Open your preferred toolchain 
@note 
  - The free Lite version of TrueSTUDIO do not support printf() redirection.
    For more information, see "note.txt" under "STM32L1xx_StdPeriph_Templates\TrueSTUDIO".
     
 - Rebuild all files and load your image into target memory
 - Run the example

@note
- Ultra Low Power Medium-density devices are STM32L151xx and STM32L152xx 
  microcontrollers where the Flash memory density ranges between 64 and 128 Kbytes.
- Ultra Low Power Medium-density Plus devices are STM32L151xx, STM32L152xx and 
  STM32L162xx microcontrollers where the Flash memory density is 256 Kbytes.
- Ultra Low Power High-density devices are STM32L151xx, STM32L152xx and STM32L162xx 
  microcontrollers where the Flash memory density is 384 Kbytes.
   
 * <h3><center>&copy; COPYRIGHT STMicroelectronics</center></h3>
 */


