SC1005 Lab 5

module convert (input [3:0] in,
                output reg [3:0] out);
    // Converts 0-15 into the 0th - 15th character of "AAC0FFEEA15A900D" respectively
    always @ * begin
        case (in)   // AAC0FFEEA15A900D, we are using 'A' as space
            4'd0: out = 4'hA;
            4'd1: out = 4'hA;
            4'd2: out = 4'hC;
            4'd3: out = 4'h0;
            4'd4: out = 4'hF;
            4'd5: out = 4'hF;
            4'd6: out = 4'hE;
            4'd7: out = 4'hE;
            4'd8: out = 4'hA;
            4'd9: out = 4'h1;
            4'd10: out = 4'h4;
            4'd11: out = 4'hA;
            4'd12: out = 4'h9;
            4'd13: out = 4'h0;
            4'd14: out = 4'h0;
            4'd15: out = 4'hD;
            default: out = 4'hA;
        endcase
    end
endmodule


module scroll(input clk, rst,
              output [15:0] display);

    reg [3:0] count;

    always @ (posedge clk) begin
        if (rst)
            count <= 4'd0;
        else
            count <= count + 1'b1;
    end
    // Count goes from 0 to 15, 1 step per clock cycle

    wire [3:0] a, b, c, d;
    assign a = count;
    assign b = count+1;
    assign c = count+2;
    assign d = count+3;
    // a,b,c,d is 4 consecutive numbers starting from count (with loop-around so 16->0)

    convert c1 (a, display[15:12]);
    convert c2 (b, display[11:8]);
    convert c3 (c, display[7:4]);
    convert c4 (d, display[3:0]);

endmodule