/**
  @page USART_HyperTerminal_Interrupt USART Hyperterminal interrupt Example
  
  @verbatim
  ******************** (C) COPYRIGHT 2012 STMicroelectronics *******************
  * @file    USART/HyperTerminal_Interrupt/readme.txt 
  * @author  MCD Application Team
  * @version V1.1.1
  * @date    13-April-2012
  * @brief   Description of the USART Hyperterminal interrupt 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 provides a description of how to use the EVAL_COM2 when using the
STM32L152-EVAL (or EVAL_COM1 when using the STM32L152D-EVAL) Transmit and Receive 
interrupts to communicate with the hyperterminal.


First, the EVAL_COM2 when using the STM32L152-EVAL (or EVAL_COM1 when using the STM32L152D-EVAL)
sends the TxBuffer to the hyperterminal and still waiting for a string from the hyperterminal
that you must enter.The string that you have entered is stored in the RxBuffer array. The receive
buffer have a RxBufferSize bytes as maximum (the reception is stopped when this
maximum receive value is reached).

The EVAL_COM2 (or EVAL_COM1) is configured as follow:
    - BaudRate = 9600 baud  
    - Word Length = 8 Bits (7 data bit + 1 parity bit)
    - Two Stop Bit
    - Odd parity
    - Hardware flow control disabled (RTS and CTS signals)
    - Receive and transmit enabled

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

  - USART/HyperTerminal_Interrupt/stm32l1xx_conf.h     Library Configuration file
  - USART/HyperTerminal_Interrupt/stm32l1xx_it.h       Interrupt handlers header file
  - USART/HyperTerminal_Interrupt/stm32l1xx_it.c       Interrupt handlers source file
  - USART/HyperTerminal_Interrupt/main.c               Main program
  - USART/HyperTerminal_Interrupt/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.

  - STM32L152-EVAL Set-up
    - Connect a null-modem female/female RS232 cable between the DB9 connector 
      CN5(when USART3 is used) and PC serial port.
    - Make sure that JP7 and JP8 are in position 2<->3 
     
  
  - STM32L152D-EVAL Set-up
    - Connect a null-modem female/female RS232 cable between the DB9 connector 
         CN1(when USART1 (EVAL_COM1) is used) and PC serial port.

  - Hyperterminal configuration:
    - Word Length = 7 Bits
    - Two 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 :
 - Copy all source files from this example folder to the template folder under
   Project\STM32L1xx_StdPeriph_Templates
 - Open your preferred toolchain 
 - 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>
 */


