30. PWM with 4-bit Resolution

How do you plan to solve it?

module pwm4_basic(
    input clk,rst,
    input [3:0]duty,
    output reg pwm_out
);
reg[3:0]cunt;
always@(posedge clk)begin
    if(rst)begin
        pwm_out<=0;
        cunt<=0;
    end
    else begin
        cunt<=cunt+1;
        if(cunt<duty)begin
            pwm_out<=1;
        end
        else
            pwm_out<=0;
    end
end
endmodule