//--------------------------------------------------------------------------------------------------
//
// 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
// By          : Itf2Vhdl ver. 1.20
//
//-------------------------------------------------------------------------------------------------
//
// Description : 
//
//-------------------------------------------------------------------------------------------------
`timescale 1ps / 1ps

//{{ Section below this comment is automatically maintained
//   and may be overwritten
//{module {Light_Game}}
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