* 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 !!