module top(
    input  wire CLOCK_50,
    output wire WS2812_OUT
);

    localparam integer LED_NUM       = 10;
    localparam integer TICK_1SEC     = 50_000_000;
    localparam integer COUNTER_WIDTH = 26;

    reg [COUNTER_WIDTH-1:0] sec_count;
    reg [LED_NUM-1:0]       led_mask;

    initial begin
        sec_count = 0;
        led_mask  = 10'b0000000001;
    end

    always @(posedge CLOCK_50) begin
        if (sec_count == TICK_1SEC - 1) begin
            sec_count <= 0;

            // LED0 -> LED1 -> ... -> LED9 -> LED0
            led_mask <= {led_mask[LED_NUM-2:0], led_mask[LED_NUM-1]};
        end
        else begin
            sec_count <= sec_count + 1'b1;
        end
    end

    omdazz_WS2812b #(
        .WS2812_NUM(LED_NUM),
        .CLK_FRE     (50_000_000)
    ) u_ws2812 (
        .CLOCK_50(CLOCK_50),
        .LED_MASK(led_mask),
        .WS2812  (WS2812_OUT)
    );

endmodule