Stepper Motor Control DRV8825

[wildbill]

@sionaggutraidh

*at least I think it's called a prototype, I never use them, since the IDE doesn't insist on them and afaik takes care of the lack thereof under the hood

Prototype is the correct name and the IDE does generate them behind the scenes. However, this sometimes can cause bizarre compilation errors when that prototype generation process goes awry.