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]cnt;
    always @(posedge clk)begin
        if(rst)begin
        cnt=1'b0;
        pwm_out=0;
        end else begin
            pwm_out<=(cnt<duty);
            cnt<=cnt+1;
        end
    end
endmodule