30. PWM with 4-bit Resolution

How do you plan to solve it?

module pwm4_basic(
    input clk,
    input 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 < duty)
                pwm_out <= 1;
            else
                pwm_out <= 0;
            if (cnt == 4'd15)
                cnt <= 0;
            else
                cnt <= cnt + 1;

            
        end
    end
endmodule