Nasm usb driver
Nasm usb driver
Hi all. I'm probably asking a bit too much. Has anyone developed a simple usb driver (any version) in nasm assembly?
Re: Nasm usb driver
Hi,
I highly suggest that you do not write a USB driver in assembly. The code can get quite complex and a single error, syntax or otherwise, will be very difficult to find.
On that note though, quite a while ago I did write a simple example in assembly to find a UHCI device.
https://www.fysnet.net/usb.htm
Please note that it does very little error checking, has a lot of assumptions, and was for information purposes only.
Ben
- https://www.fysnet.net/osdesign_book_series.htm
I highly suggest that you do not write a USB driver in assembly. The code can get quite complex and a single error, syntax or otherwise, will be very difficult to find.
On that note though, quite a while ago I did write a simple example in assembly to find a UHCI device.
https://www.fysnet.net/usb.htm
Please note that it does very little error checking, has a lot of assumptions, and was for information purposes only.
Ben
- https://www.fysnet.net/osdesign_book_series.htm
Re: Nasm usb driver
I've just started off with usb keyboard driver and got as far as getting device and configuration descriptors but got stuck on several fronts here as I'm running my o/s in virtualbox under windows 11 which generates 2 different results compared to vmware pro; ie: set_configuration is acknowledged in vmware but not in virtualbox. Another issue is both interfaces (for keyboard & mouse) in vmware's configuration descriptor only give Classcode=3 but Subclass and Protocol are 0x00 and on top of all that both vms only allow 1 msi interrupt compared to 8 on baremetal. Yea... a bit of hassle for now.