30. PWM with 4-bit Resolution

How do you plan to solve it?

/*Write your code here*/
module pwm4_basic (
    input wire clk,
    input wire rst,
    input [3:0] duty,
    output reg pwm_out
);

reg [3:0] cnt;

always @(posedge clk) begin
    pwm_out <= rst ? 0 : (cnt < duty);
    cnt <= rst ? 4'b0000 : (cnt + 4'b0001);
end
endmodule