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<=0;
        pwm_out<=0;
    end else begin
        cnt<=cnt+1;
        pwm_out<=(cnt<duty);
    end
    end
    endmodule