I use a bread machine too.

I found a website which said that 1.42 cups of oatmeal (pulverized) equals 1 cup of flour, so I tried it. It produced a loaf about 2.5 inches high in the middle and one inch at the ends. It's okay for toast, but just this one time.

My next step will be to take an oatmeal bread recipe and see if the cracked wheat will "float" in it, like raisins. I've found a site which tells when to check the dough for stickness vs dryness.