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 pwm_out);
    reg pwm;
    reg[3:0] counter;
    always@(posedge clk)begin
    if(rst) begin
    pwm<=1'b0;
    counter<=4'd0;
    end
    else begin
       
        counter<=counter+1;
        if(counter<duty) begin
        pwm<=1'b1;
        end
        else  pwm<=1'b0;
    end
    end
    assign pwm_out=pwm;
endmodule