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