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] pwm ;

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


endmodule