I\'m a software developer. I\'ve been programming in high level languages for a few years.
I would like to know, how to take my first step into programming hardware. N
The actual programming isn't a big deal. The frustrating, annoying part is getting your development environment setup and getting the tools working. Once you've done that, you're half done.
I'd suggest buying a development kit ('dev kit') that has USB built in and works with your chosen OS. Get that working, and you're halfway done.
If you're missing the knowledge, it's also important to know the basics of how a processor works. You'll be programming at a much lower level than any other programming, so the fundamentals are a bit more important.