examples/tinyfpga_rev1/morse.v

module top(input clk_pin, output led_pin);

    wire clk, led;

    (* LOC="B18" *) (* IO_TYPE="LVCMOS33" *)
    TRELLIS_IO #(.DIR("INPUT")) clk_buf (.B(clk_pin), .O(clk));

    (* LOC="C1" *) (* IO_TYPE="LVCMOS33" *)
    TRELLIS_IO #(.DIR("OUTPUT")) led_buf_0 (.B(led_pin), .I(led));
	// HELLO
	// .... . .-.. .-.. ---
    // 10101 000 1 000 101110101 000 101110101 000 11101110111 00000000
	localparam pattern_len = 55;
	localparam pattern = 55'b00000000_11101110111_000_101011101_000_101011101_000_1_000_10101;

	reg [20:0] div = 0;

	always @ ( posedge clk ) begin
		div <= div + 1'b1;
	end

	reg [5:0] ctr = 0;
	always @(posedge clk) begin
		if (div == 0) begin
			if (ctr == pattern_len - 1) begin
				ctr <= 0;
			end else begin
				ctr <= ctr + 1'b1;
			end
		end
	end

	assign led = pattern[ctr];

endmodule