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] counter;

always @(posedge clk) 
begin
  if (rst) 
  begin
    pwm_out <= 1'b0;
    counter <= 4'd0;
  end
  else
  begin
    counter <= counter + 1'b1; 
    if (counter < duty) 
     pwm_out <= 1'b1;
     else
     pwm_out <= 1'b0;
  end 

end

endmodule