icebling-top.v

icebling-top.v

// LED pattern
parameter PAT_LETTERS   = 2'b00;
parameter PAT_CONWAY    = 2'b01;
parameter PAT_RAIN      = 2'b10;
reg [1:0] curr_patt;
...

// assign buffer based on curent pattern
wire [63:0] w_fb = (curr_patt == PAT_LETTERS) ? w_fb_lett : 
                            ((curr_patt == PAT_CONWAY) ? 
                              w_fb_conway : w_fb_rain);
...
    // letters module
    wire [63:0] w_fb_lett;
    letters88 let (
        .resetn(resetn),
        .clk(clk),
        .fb(w_fb_lett)
    );

    // rain module
    wire [63:0] w_fb_rain;
    rain88 rn(
        .resetn(resetn),
        .clk(clk),
        .fb(w_fb_rain)
    );

    // Conway's GOL
    wire [63:0] w_fb_conway;
    conway88 c88 (
        .resetn(resetn),
        .clk(clk),
        .fb(w_fb_conway)
    );

    // instatiate dot88
    dot88 d88(
        .resetn(resetn),
        .clk(clk),
        .fb(w_fb),
        .row(row),
        .col(col)
    );
 
always @(posedge clk) 
    begin
        // initialise rot
        if (!resetn) 
            begin
                counter <= 0;
                curr_patt <= PAT_LETTERS;
                sw_counter <= 0;
            end
        else  
            begin
                
                // increment counters
                counter <= counter + 1;
                sw_counter <= sw_counter + 1;

                // switch pattern 
                if (!sw_counter)
                    curr_patt <= curr_patt + 1;

                // blink LED
                if (!counter) 
                    begin
                        L2 = ~L2;
                    end
            end