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with HAL;              use HAL;
with NeoPixel;         use NeoPixel;
with MicroBit.Buttons; use MicroBit.Buttons;

--  Human-Machine Interface helper subprograms for line follower demo
--  (button control and NeoPixel strip).

--  These are declared in a library package, rather than as local (nested)
--  subprograms in Main to work around access-to-subprogram restrictions
--  that would arise.

package HMI is

   Motors_Enable : Boolean := False;
   procedure Button_CB
     (Button : Button_Id;
      State  : Button_State);
   --  Pressing button A toggles Motors_Enable

   Strip : LED_Strip := Create (Mode => GRB, Count => 5);
   procedure Kitronik_Write (Buffer : UInt8_Array);
   --  Write buffer to the NeoPixel strip of Kitronik
   --  Servo:Lite board.

end HMI;