30. PWM with 4-bit Resolution

How do you plan to solve it?

/*Write your code here*/
module pwm4_basic(clk,rst,duty,pwm_out);
input clk,rst;
input [3:0] duty ;
output reg pwm_out ;
reg [3:0] cnt;
initial cnt<=1'b0;
always @(posedge clk )  begin 
    if(rst ==1'b1) begin 
        cnt<=4'b0000;
        pwm_out<=1'b0;
    end
    else  begin 
        if(cnt<duty)
        pwm_out<=1'b1;
        else 
        pwm_out<=1'b0;
        cnt<=cnt+1'b1;
    end
end
endmodule