* Controllers on STM32 discovery board. Various configuration available:
  - 2 inputs to 1 output (one input at a time)
  - 2 inputs to 2 outputs (2 controller running simultaneously)
  - input can be ADC integrated on STM32 or external MCP3551 ADC device.
  
  * Set a new configuration:
  - Board must be powered on.
  - Connect USB cable between PC and connector CN5 of board (micro USB type B).
  - Board must appear as a removable media 'PYBFLASH'.
  - Mount the board.
  - Copy files to board with respect to your usage:
    ° copy files of servo_commmon directory to STM32 discovery board.
    ° copy 'servo2toX_core.py' file to STM32 discovery board.
    ° copy 'servo2toX_INPUT_OUTPUT' file (with respect to INPUT and OUTPUT device) to STM32 discovery board.
    ° update content of 'boot.py' file to 'servo2toX_INPUT_OUTPUT', example:
    -> pyb.main('servo2to1_adc_vnh.py')
  
  * Use GUI client "client_2tox.py" to handle controllers parameters.
  !! Need to connect USB cable to CN5 to open a serial link with board !!