I'm not sure if you like origin stories but I've been reading a lot about hard and soft grains lately. I have never tried milling my own grain but it's on the list.
Here is a video
on the origin of Oat Cakes in the Scotch Highlands
In the colonial United States Corn was the main crop used to make johnnycakes that evolved from the Scottish Oatcake. The history is really interesting.
Here is a video from one of my favorite youtube channels "Townsends," Discussing the Johny Cake or the food of the downtrodden.
Here is another Townsend's video discussing ash
cakes made by soldiers on the move and travelers. Russians soldiers preferred rye and would make huge batches in common ovens. I may be lame but this is a fascinating subject.