3 ms·

I realize this is just one data point, but I implemented a full EHCI (USB 2.0) stack in 3 weekends. Then I implemented a simple mass storage driver in 2 more (t

by sounds 14y ago

I realize this is just one data point, but I implemented a full EHCI (USB 2.0) stack in 3 weekends. Then I implemented a simple mass storage driver in 2 more (that was the hardware I was targeting). My HID implementation isn't worth talking about but it was helpful to test interrupt transfers.

krichman 14y ago
I'm assuming by the fact that it took you a few weekends, you are beyond the level of learning about OS's as an undergrad, though :) I'm sure it is doable, but the point is probably that it's a non-trivial detour from writing a basic OS.
- sounds 14y ago
  Yes, of course. I'm all for teaching as many undergrads as possible about writing an OS - so many valuable lessons that aren't easy to teach in any other context. Still – there are always a few who really take off. Such might enjoy a tutorial that walked through doing a full USB stack. Maybe... :) I feel compelled to speak for the over-achievers because they may not even realize they could go so far, so fast, until someone points them in the right direction. It's fun to watch.
sown 14y ago
That sounds neat. If by chance you ever write a tutorial I'd be all ears! :D
- sounds 14y ago
  I thought about a tutorial or a step-by-step but EHCI controllers vary widely by platform, and going with the "least common denominator" means doing it for x86... I could never convince myself it was worth a blog post. Maybe if the RPi becomes a favorite for OS development, I might do it. You could always poke around on http://osdev.org http://osdev.org and see if you find some useful stuff there. :)
  - sown 14y ago
    Some controller better than no controller. I was allegedly a kernel engineer at one time but never go to do any kind of development work, so this sort of thing intrigues me greatly. What hardware did you have?

3 ms·

I realize this is just one data point, but I implemented a full EHCI (USB 2.0) stack in 3 weekends. Then I implemented a simple mass storage driver in 2 more (t

by sounds 14y ago

krichman 14y ago
I'm assuming by the fact that it took you a few weekends, you are beyond the level of learning about OS's as an undergrad, though :) I'm sure it is doable, but the point is probably that it's a non-trivial detour from writing a basic OS.
- sounds 14y ago
  Yes, of course. I'm all for teaching as many undergrads as possible about writing an OS - so many valuable lessons that aren't easy to teach in any other context. Still – there are always a few who really take off. Such might enjoy a tutorial that walked through doing a full USB stack. Maybe... :) I feel compelled to speak for the over-achievers because they may not even realize they could go so far, so fast, until someone points them in the right direction. It's fun to watch.
sown 14y ago
That sounds neat. If by chance you ever write a tutorial I'd be all ears! :D
- sounds 14y ago
  I thought about a tutorial or a step-by-step but EHCI controllers vary widely by platform, and going with the "least common denominator" means doing it for x86... I could never convince myself it was worth a blog post. Maybe if the RPi becomes a favorite for OS development, I might do it. You could always poke around on http://osdev.org http://osdev.org and see if you find some useful stuff there. :)
  - sown 14y ago
    Some controller better than no controller. I was allegedly a kernel engineer at one time but never go to do any kind of development work, so this sort of thing intrigues me greatly. What hardware did you have?