Am I facing charges that will come in the mail if I didn't get any written citation or paperwork and was not arrested?

I was driving home from the bar and was pulled over. The cop asked if I had been drinking and I said I had been. He gave me a FST, then a breath analyzer (to which I blew a .17). He then told me I was twice over the legal limit, and asked where I was going. I was going to a friend's house just down the road. The cop asked me to lock up my car, and had me get into the back of his car to which he drove me to my friend's house. He let me out and went on his way.