30. PWM with 4-bit Resolution

How do you plan to solve it?

/*Write your code here*/
module pwm4_basic(
    input clk,rst,
    input [3:0] duty,
    output reg pwm_out
);

    reg [3:0] cnt;

    always@(posedge clk) begin
        if(rst) begin
            cnt <= 0;
            pwm_out <= 0;
        end
        else begin
            if(cnt<duty)
                pwm_out <= 1;
            else
                pwm_out <= 0;
            cnt <= cnt + 1;
        end
    end

endmodule