`timescale 1ns/1ps

/*
* Chance Reimer
* Ver 1 
* Date: 8/30/2018
*/

module displayNUM(input clk,
	          input rst,
	          input [7:0] data, 
		  input reg [1:0] toggle_Display,
		  output reg [7:0] anode, 
		  output reg [7:0] _7LED,
	  	  output reg [2:0] modeLED);

	//LUT for the display
	logic [7:0] anodeSelect [0:15]; //here is our select for our Anode use codes 0-9 for our LUT
	assign anodeSelect[0]  = 8'b00000010; //0 //ABCDEFGDP is pinout, active low
	assign anodeSelect[1]  = 8'b10011110; //1
	assign anodeSelect[2]  = 8'b00100100; //2
	assign anodeSelect[3]  = 8'b00001100; //3
	assign anodeSelect[4]  = 8'b10011000; //4
	assign anodeSelect[5]  = 8'b01001000; //5 
	assign anodeSelect[6]  = 8'b01000000; //6
	assign anodeSelect[7]  = 8'b00011110; //7
	assign anodeSelect[8]  = 8'b00000000; //8
	assign anodeSelect[9]  = 8'b00001000; //9
	assign anodeSelect[10] = 8'b00010000; //A
	assign anodeSelect[11] = 8'b11000000; //b
	assign anodeSelect[12] = 8'b01100010; //C
	assign anodeSelect[13] = 8'b10000100; //d
	assign anodeSelect[14] = 8'b01100000; //E
	assign anodeSelect[15] = 8'b01110000; //F

	reg [19:0] refresh; //sets enable for refresh rate
	reg [3:0] select; //determines what value will be sent out to chosen 7 seg
	reg [3:0] ones;
	reg [3:0] tens;
	reg [3:0] hundreds;
	
	wire [2:0] enable; //tells when to switch to next anode
	
	//this always block gives the refresh rate for the 7seg display
	always_ff@(posedge clk or posedge rst)
	begin
		if(rst)
			refresh <= 0;
		else
			refresh <= refresh+1;
	end
	
	//this enable value is actually what is checked to move to the next 7seg
	assign enable = refresh[19:17];

	//this will always select the proper output based on the toggle
	always_ff@(posedge clk)
	begin 
	        ones <= ((data % 100)%10);
            tens <= (data%100)/10;
            hundreds <= data/100;
	end
	always_comb
	begin
		case(toggle_Display) //Toggle is more important than the second one which is now a helper class
			2'b00: begin //this is the binary one	
				modeLED = 3'b001; //checker to know what mode we are in
				case(enable)
					3'b000: begin
						anode = 8'b01111111; //remember all of the anode LED turn ons are active LOW
						select = data[7];
					end
					3'b001: begin
						anode = 8'b10111111;
						select = data[6];
					end
					3'b010: begin
						anode = 8'b11011111;
						select = data[5];
					end
					3'b011: begin
						anode = 8'b11101111;
						select = data[4];
					end
					3'b100: begin
						anode = 8'b11110111;
						select = data[3];
					end
					3'b101: begin
						anode = 8'b11111011;
						select = data[2];
					end
					3'b110: begin
						anode = 8'b11111101;
						select = data[1];
					end
					3'b111: begin
						anode = 8'b11111110;
						select = data[0];
					end
				endcase
			end
			2'b01:begin //this is the decimal one
				modeLED = 3'b011;
				case(enable)
       					 3'b000: begin
       					        select = hundreds;
            				 	anode = 8'b11111011; //this is for the hundreds
              				end
        				3'b100: begin
        				        select = tens;
            					anode = 8'b11111101; //this is for the tens
              				end
        				3'b110: begin
        				        select = ones;
            					anode = 8'b11111110; //This is for the ones
                			end
        			endcase
			end
			2'b10:begin //this is the hexadecimal one
				modeLED = 3'b111;
				case(enable)
					3'b000: begin
					    select = data/16;
						anode = 8'b11111101; //for 16^1
					end
					3'b100: begin
					    select = data%16;
						anode = 8'b11111110; //for 16^0
					end
				endcase
			end
		endcase
	end

	//here we assign our LUT to the _7LED
	always_comb
	begin
		case(select)
			4'b0000: _7LED = anodeSelect[0];  // 0     
        		4'b0001: _7LED = anodeSelect[1];  // 1 
        		4'b0010: _7LED = anodeSelect[2];  // 2 
        		4'b0011: _7LED = anodeSelect[3];  // 3 
        		4'b0100: _7LED = anodeSelect[4];  // 4 
        		4'b0101: _7LED = anodeSelect[5];  // 5
       		        4'b0110: _7LED = anodeSelect[6];  // 6 
        		4'b0111: _7LED = anodeSelect[7];  // 7 
        		4'b1000: _7LED = anodeSelect[8];  // 8    
        		4'b1001: _7LED = anodeSelect[9];  // 9 
			4'b1010: _7LED = anodeSelect[10]; // A
			4'b1011: _7LED = anodeSelect[11]; // B
			4'b1100: _7LED = anodeSelect[12]; // C
			4'b1101: _7LED = anodeSelect[13]; // D
			4'b1110: _7LED = anodeSelect[14]; // E
			4'b1111: _7LED = anodeSelect[15]; // F
        		default: _7LED = anodeSelect[0];  // 0		
		endcase
	end
endmodule