/* Convert a nybble in HEX to 7-segment BIT-mask.
   Modified from Xilinx tutorial project watchver_u.
 */
module hex2led (HEX, LED);
input [3:0] HEX;
output [6:0] LED;

reg [6:0] LED;

// segment encoding
//      0
//     ---  
//  5 |   | 1
//     ---   <- 6
//  4 |   | 2
//     ---
//      3

always @(HEX)
begin
    case (HEX)
	4'b0001 : LED <= 7'b1111001;	//1
	4'b0010 : LED <= 7'b0100100;	//2
	4'b0011 : LED <= 7'b0110000;	//3
	4'b0100 : LED <= 7'b0011001;	//4
	4'b0101 : LED <= 7'b0010010;	//5
	4'b0110 : LED <= 7'b0000010;	//6
	4'b0111 : LED <= 7'b1111000;	//7
	4'b1000 : LED <= 7'b0000000;	//8
	4'b1001 : LED <= 7'b0010000;	//9
	4'b1010 : LED <= 7'b0001000;	//A
	4'b1011 : LED <= 7'b0000011;	//b
	4'b1100 : LED <= 7'b1000110;	//C
	4'b1101 : LED <= 7'b0100001;	//d
	4'b1110 : LED <= 7'b0000110;	//E
	4'b1111 : LED <= 7'b0001110;	//F
	default : LED <= 7'b1000000;	//0
    endcase
end

endmodule