30. PWM with 4-bit Resolution

How do you plan to solve it?

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

    always @( posedge clk )
    begin
        if( rst )
        begin
            counter <= 4'b0;
            pwm_out <= 1'b0;
        end
        else
        begin
            pwm_out <= ( counter < duty );
            counter <= counter + 1;
        end
    end
endmodule