Stomp test not bringing up any codes?

[we_call_him_doher]

So today I was sitting in my car, and out of pure curiosity I did a stomp test just to see if it would work. Well it did; the check engine light started blinking and blinking and blinking, but nothing came up on the LCD display. I thought that at the very least there was some code that was a no fault code that should have came up? Am I wrong? Nothing is wrong with my car (as far as I can tell), so I didn't expect any fault codes to come up, but shouldnt something come up?

Thanks

[632 Regal]

you are supposed to count the short blinks, thats your code. the long blink seperates the codes.

Do 90s have this option?

[SharkmanBMW]

it doesn't seem to work for every car.
but if you got it to flash codes, you need to learn how to read them - Jeff was right, count the flashes!