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