Initialization and de-initialization functions
[I2C Exported Functions]

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              ##### Initialization and de-initialization functions #####
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    [..]  This subsection provides a set of functions allowing to initialize and 
          deinitialize the I2Cx peripheral:

      (+) User must Implement HAL_I2C_MspInit() function in which he configures 
          all related peripherals resources (CLOCK, GPIO, DMA, IT and NVIC ).

      (+) Call the function HAL_I2C_Init() to configure the selected device with 
          the selected configuration:
        (++) Clock Timing
        (++) Own Address 1
        (++) Addressing mode (Master, Slave)
        (++) Dual Addressing mode
        (++) Own Address 2
        (++) Own Address 2 Mask
        (++) General call mode
        (++) Nostretch mode

      (+) Call the function HAL_I2C_DeInit() to restore the default configuration 
          of the selected I2Cx peripheral.