30. PWM with 4-bit Resolution

How do you plan to solve it?

/*Write your code here*/
module pwm4_basic
(
    input wire clk,rst,
    input wire [3:0] duty,
    output reg pwm_out
);
reg [3:0] cnt = 0;
always@(posedge clk)
begin
    if(rst)
    begin
        pwm_out<=0;
        cnt<=0;
    end
    else
    begin
        if(cnt<duty)
            pwm_out<=1;
        else
            pwm_out<=0;
        cnt<=cnt+1;
    end
end
endmodule