/**
  @page USART_Synchronous USART Synchronous example
  
  @verbatim
  ******************** (C) COPYRIGHT 2011 STMicroelectronics *******************
  * @file    USART/Synchronous/readme.txt 
  * @author  MCD Application Team
  * @version V3.5.0
  * @date    08-April-2011
  * @brief   Description of the USART Synchronous example.
  ******************************************************************************
  * THE PRESENT FIRMWARE WHICH IS FOR GUIDANCE ONLY AIMS AT PROVIDING CUSTOMERS
  * WITH CODING INFORMATION REGARDING THEIR PRODUCTS IN ORDER FOR THEM TO SAVE
  * TIME. AS A RESULT, STMICROELECTRONICS SHALL NOT BE HELD LIABLE FOR ANY
  * DIRECT, INDIRECT OR CONSEQUENTIAL DAMAGES WITH RESPECT TO ANY CLAIMS ARISING
  * FROM THE CONTENT OF SUCH FIRMWARE AND/OR THE USE MADE BY CUSTOMERS OF THE
  * CODING INFORMATION CONTAINED HEREIN IN CONNECTION WITH THEIR PRODUCTS.
  ******************************************************************************
   @endverbatim

@par Example Description 

This example provides a basic communication between USARTy (Synchronous mode) 
and SPIy using flags. USARTy and SPIy can be USART1 and SPI1 or USART2 and SPI3,
depending on the STMicroelectronics EVAL board you are using.

First, the USARTy sends data from TxBuffer1 buffer to SPIy using USARTy TXE flag.
Data received, using RXNE flag, by SPIy is stored in RxBuffer2 then compared with
the sent ones and the result of this comparison is stored in the "TransferStatus1" 
variable.
 
Then, the SPIy sends data from TxBuffer2 buffer to USARTy using SPIy TXE flag.
Data received, using RXNE flag, by USARTy is stored in RxBuffer1 then compared with
the sent ones and the result of this comparison is stored in the "TransferStatus2" 
variable.

USARTy 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
  - USART Clock enabled
  - USART CPOL: Clock is active high
  - USART CPHA: Data is captured on the second edge 
  - USART LastBit: The clock pulse of the last data bit is output to the SCLK pin

SPIy configured as follow:
  - Direction = 2 Lines FullDuplex
  - Mode = Slave Mode
  - DataSize = 8 Bits
  - CPOL = Clock is active high
  - CPHA = Data is captured on the second edge 
  - NSS = NSS Software
  - First Bit = First Bit is the LSB  


@par Directory contents 
  
  - USART/Synchronous/platform_config.h    Evaluation board specific configuration file
  - USART/Synchronous/stm32f10x_conf.h     Library Configuration file
  - USART/Synchronous/stm32f10x_it.h       Interrupt handlers header file
  - USART/Synchronous/stm32f10x_it.c       Interrupt handlers
  - USART/Synchronous/main.c               Main program
  - USART/Synchronous/system_stm32f10x.c   STM32F10x system source file

@par Hardware and Software environment 

  - This example runs on STM32F10x Connectivity line, High-Density, High-Density 
    Value line, Medium-Density, XL-Density, Medium-Density Value line, Low-Density 
    and Low-Density Value line Devices.
  
  - This example has been tested with STMicroelectronics STM32100E-EVAL (High-Density 
    Value line), STM32100B-EVAL (Medium-Density Value line), STM3210E-EVAL 
    (High-Density and XL-Density) and STM3210B-EVAL (Medium-Density) evaluation 
    boards and can be easily tailored to any other supported device and development 
    board.
    This example can't be tested with STM3210C-EVAL (Connectivity Line) evaluation
    board since the USART CK pins are already used by other on-board modules.
    To select the STMicroelectronics evaluation board used to run the example, 
    uncomment the corresponding line in USART/Synchronous/platform_config.h file

  - STM32100E-EVAL Set-up 
    - Connect USART1_Tx(PA.09) to SPI1_MOSI(PA.07), USART1_Rx(PA.10) to 
      SPI1_MISO(PA.06) and USART1_CK(PA.08) to SPI1_SCK(PA.05).  
      
  - STM32100B-EVAL Set-up 
    - Connect USART1_Tx(PA.09) to SPI1_MOSI(PA.07), USART1_Rx(PA.10) to 
      SPI1_MISO(PA.06) and USART1_CK(PA.08) to SPI1_SCK(PA.05).      

  - STM3210E-EVAL Set-up 
    - Connect USART1_Tx(PA.09) to SPI1_MOSI(PA.07), USART1_Rx(PA.10) to 
      SPI1_MISO(PA.06) and USART1_CK(PA.08) to SPI1_SCK(PA.05).

  - STM3210B-EVAL Set-up 
    - Connect USART1_Tx(PA.09) to SPI1_MOSI(PA.07), USART1_Rx(PA.10) to 
      SPI1_MISO(PA.06) and USART1_CK(PA.08) to SPI1_SCK(PA.05).        
 
@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\STM32F10x_StdPeriph_Template
 - Open your preferred toolchain 
 - Rebuild all files and load your image into target memory
 - Run the example 

@note
 - Low-density Value line devices are STM32F100xx microcontrollers where the 
   Flash memory density ranges between 16 and 32 Kbytes.
 - Low-density devices are STM32F101xx, STM32F102xx and STM32F103xx 
   microcontrollers where the Flash memory density ranges between 16 and 32 Kbytes.
 - Medium-density Value line devices are STM32F100xx microcontrollers where
   the Flash memory density ranges between 64 and 128 Kbytes.  
 - Medium-density devices are STM32F101xx, STM32F102xx and STM32F103xx 
   microcontrollers where the Flash memory density ranges between 64 and 128 Kbytes.
 - High-density Value line devices are STM32F100xx microcontrollers where
   the Flash memory density ranges between 256 and 512 Kbytes.
 - High-density devices are STM32F101xx and STM32F103xx microcontrollers where
   the Flash memory density ranges between 256 and 512 Kbytes.
 - XL-density devices are STM32F101xx and STM32F103xx microcontrollers where
   the Flash memory density ranges between 512 and 1024 Kbytes.
 - Connectivity line devices are STM32F105xx and STM32F107xx microcontrollers.
    
 * <h3><center>&copy; COPYRIGHT 2011 STMicroelectronics</center></h3>
 */
