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
        if(rst) begin
            cnt <=0;
            pwm_out <=0;
        end
        else begin
            if (cnt == 4'd15)
                cnt <= 4'd0;
            else
                cnt <= cnt+1;
            
            if(cnt<duty) begin
                pwm_out <= 1'b1;
            end
            else begin
                pwm_out <= 1'b0;
            end
        end
    end
endmodule