//--------------------------------------------------------------------------------------------------
//
// Title       : Light_Game
// Design      : Lab7_part2
// Author      : cse
// Company     : uw
//
//--------------------------------------------------------------
//
// File        : Light_Game.v
// Generated   : Tue Nov 18 12:38:04 2003
// From        : interface description file
//
//--------------------------------------------------------------
//
// Description : 
//
//--------------------------------------------------------------
`timescale 1ps / 1ps

module Light_Game (LEDS, LPB, RPB, CLK, RESET);
	
  input LPB ;
  input RPB ;
  input CLK ;
  input RESET;
	
  output [6:0] LEDS ;
	
  reg [6:0] position;
	
  reg 	    left;
  reg 	    right;
  
  wire 	    L, R;
	
  assign  L = ~left && LPB;
  assign  R = ~right && RPB;
	
  assign  LEDS = position;
	
  always @(posedge CLK)
    begin  
      left <= LPB;
      right <= RPB;
      if (RESET) position <= 7'b0001000;	
      else if ((position == 7'b0000001) || (position == 7'b1000000)) ;
      else if (L) position <= position << 1;
      else if (R) position <= position >> 1; 
    end
endmodule