hexdisplay.v

The objective of this project is to create a driver for a camera module (we used the OV7620). After

//////////////////////////////////////////////////////////////////////////////////
// Company: 
// Engineer: Patrick Moore and John Lagnese (group 1)
// 
// Create Date:    15:17:34 01/24/2007 
// Design Name: 
// Module Name:    HexDisplay, DigitDisplay 
// Project Name: Count
// Target Devices: 
// Tool versions: 
// Description: Displays a Hex number on the board
//
// Dependencies: none.
//
// Revision: 

// Revision 0.01 - File Created
// Additional Comments: 
//
//////////////////////////////////////////////////////////////////////////////////

module HexDisplay(value,CLK,an,seg);		//Display the value on the board in Hex

	input CLK;
	input [15:0] value;			//Value being passed in	output an3,an2,an1,an0,a,b,c,d,e,f,g;		
	output [3:0] an;
	output [6:0] seg;
	
	reg [3:0] digit;				//Represent the actual digit
	reg [3:0] an;			//Individual display digits
		
	DigitDiplay dd(digit,seg[0],seg[1],seg[2],seg[3],seg[4],seg[5],seg[6]);	//Displays the digit

	reg [15:0] counter;			//Keeps track of the clock
	
	
	always @ (posedge CLK)		//Cycles through the board display enabling\disabling, too fast for the eye to notice
		begin	
			casex(counter)

//Disables the left most display, digit represents the 1s place, and the right most is enabled.
				16'b0000000000000000:	
					begin
						an[3] = 1;
						digit = value & 16'h000F;
						an[0] = 0;

						counter = counter + 1;
					end
//Enables the 2nd most display, digit represents the 10s place, and the right most is disabled.				
				16'b0100000000000000:
					begin
						an[0] = 1;
						digit = (value >> 4) & 16'h000F;
						an[1] = 0;
						
						counter = counter + 1;
					end

//Enables the 2nd left most display, digit represents the 100s place, and the 2nd right most is disabled.			
			16'b1000000000000000:
					begin
						an[1] = 1;
						digit = (value >> 8) & 16'h000F;
						an[2] = 0;

						counter = counter + 1;
					end
//Disables the 2nd left most display, digit represents the 1000s place, and the left most digit is enabled	
	16'b1100000000000000:
					begin
						an[2] = 1;
						digit = (value >> 12) & 16'h000F;
						an[3] = 0;
						
						counter = counter + 1;
					end
				default
					begin
						counter = counter + 1;
					end
			endcase
		end
endmodule

module DigitDiplay(value,a,b,c,d,e,f,g);		//Digital logic to represent the digits on the LEDs.

	input [3:0] value; 
	output a,b,c,d,e,f,g;		//Individual display segments
	
	assign c = (value == 2 || value == 12 || value == 14 || value == 15);	//2,C,E,F
	assign a = (value == 1 || value == 4 || value == 11 || value == 13);		//1,4,b,D
	assign b = (value == 5 || value == 6 || value == 11 || value == 12 || value == 14 || value == 15); //5,6,b,D,E,F
	assign d = (value == 1 || value == 4 || value == 7 || value == 10 || value == 15);	//1,4,7,A,F
	assign g = (value == 0 || value == 1 || value == 7 || value == 12);		//0,1,7,C
	assign f = (value == 1 || value == 2 || value == 3 || value == 7 || value == 13);	//1,2,3,7,D
	assign e = (value == 1 || value == 3 || value == 4 || value == 5 || value == 7 || value == 9);  //1,3,4,5,7,9
endmodule