/**
  @page DMA_I2C_RAM DMA I2C to RAM example
  
  @verbatim
  ******************** (C) COPYRIGHT 2011 STMicroelectronics *******************
  * @file    DMA/I2C_RAM/readme.txt 
  * @author  MCD Application Team
  * @version V3.5.0
  * @date    08-April-2011
  * @brief   Description of the DMA I2C to RAM 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 description of how to use two DMA channels to transfer a 
data buffer from memory to I2C2 through I2C1.

I2C1 is set as the master transmitter and I2C2 as the slave receiver. DMA1 Channel5 is
configured to store the data received from I2C2 into the Rx buffer (reception buffer).
DMA1 Channel6 is configured to transfer data from the Tx buffer (transmission buffer)
to the I2C1 DR register. After the generation of the Start condition and once the slave
address has been acknowledged, DMA capability is enabled for both I2C1 and I2C2. 
As soon as the two I2C DMAEN bits are set in the I2C1_CR2 and I2C2_CR2 registers, 
the transmission of the Tx buffer is started by DMA1 Channel5 and at the same time the
data received on I2C2 is stored in Rx buffer using DMA1 Channel6 .
The transmitted and the received buffers are compared to check that all data have been
correctly transferred.


@par Directory contents 

  - DMA/I2C_RAM/stm32f10x_conf.h    Library Configuration file
  - DMA/I2C_RAM/stm32f10x_it.c      Interrupt handlers
  - DMA/I2C_RAM/stm32f10x_it.h      Interrupt handlers header file
  - DMA/I2C_RAM/main.c              Main program
  - DMA/I2C_RAM/system_stm32f10x.c  STM32F10x system source file
  
  
@par Hardware and Software environment 

  - This example runs on STM32F10x Connectivity line, High-Density, Medium-Density, 
    XL-Density, High-Density Value line, Medium-Density Value line, Low-Density 
    and Low-Density Value line Devices.
  
  - This example has been tested with STMicroelectronics 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 STMicroelectronics STM3210C-EVAL (STM32F10x 
    Connectivity-Line) evaluation boards since the I2C2 pins (PB10 and PB11) are 
    already used by Ethernet PHY module. 
    This example can't be tested with STMicroelectronics STM32100B-EVAL (STM32F10x 
    Medium-Density Value line) and STM32100E-EVAL (High-Density Value line) 
    evaluation boards since the I2C1/I2C2 pins (PB6/PB10 and PB7/PB11) are already 
    used by HDMI-CEC module.     

  - STM3210E-EVAL Set-up 
    - Connect I2C1 SCL pin (PB.06) to I2C2 SCL pin (PB.10)
    - Connect I2C1 SDA pin (PB.07) to I2C2 SDA pin	(PB.11)
    - Check that a pull-up resistor is connected on one I2C SDA pin
    - Check that a pull-up resistor is connected on one I2C SCL pin

  - STM3210B-EVAL Set-up 
    - Connect I2C1 SCL pin (PB.06) to I2C2 SCL pin (PB.10)
    - Connect I2C1 SDA pin (PB.07) to I2C2 SDA pin	(PB.11)
    - Check that a pull-up resistor is connected on one I2C SDA pin
    - Check that a pull-up resistor is connected on one I2C SCL pin    

@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>
 */
