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]counter;
always @(posedge clk)
begin
    if(rst == 1'b0) begin
        pwm_out <= (counter < duty) ? 1'b1 : 1'b0;
        counter <= counter + 4'd1;
    end
    else begin
        counter <= 4'd0;
        pwm_out <= 1'b0;
    end
end

endmodule