개요

환경

사진

샘플 코드

module test2(input clk, input rst, output tx);
    localparam NEXT = 4'b0000;
    localparam DONE = 4'b1111;
    reg [5:0] n = 0;
    reg [7:0] char;
    reg [3:0] state = NEXT;
    reg send = 0;
    tx2 tx2(.clk(clk), .rst(rst), .send(send), .data(char), .tx(tx), .busy(busy));
    always @(posedge clk or negedge rst)
    begin
        if (rst == 0)
        begin
            state <= NEXT;
            n <= 0;
        end
        else if (send == 1)
        begin
            send <= 0;
        end
        else if (state == NEXT)
        begin
            state <= 1;
        end
        else if (busy == 0 && state != DONE)
        begin
            if (n == 26)
            begin
                state <= DONE;
            end
            else
            begin
                char <= 97 + n;
                send <= 1;
                n <= n + 1;
            end
        end
    end
endmodule