Ok every body and his brother is making a “USB enabled” device today.
Are there any standards for talking to a particular class of device? For
example if you wanted to experiement with using a USB webcam or Digital
camera in a QNX app is there a common interface used by the industry or do
you have to write vendor specific code for each device? What about the
other billion different USB devices?
Pete Eddy
Hi Pete -
If you go www.usb.org and poke about, you will find documentation for
many different classes of device, from printers to audio to bulk, not to
mention the Human Interface Device class - and even a specification of
how class specifications should be written…including the relevant
#defines for each class.
If you go out and buy almost any device, bring it home and plug it in
to your RTP computer, and then run usb -vvv, the odds are pretty good
that you will find the class is “Vendor defined” - even if the device
really does follow the proper class specification otherwise!
I have had some luck in using the Linux drivers as documentation
sources, although now I know more about the Linux usb stack than I
really wanted to know…
Phil Olynyk
OBT Software Corp
Pete Eddy wrote:
Ok every body and his brother is making a “USB enabled” device today.
Are there any standards for talking to a particular class of device? For
example if you wanted to experiement with using a USB webcam or Digital
camera in a QNX app is there a common interface used by the industry or do
you have to write vendor specific code for each device? What about the
other billion different USB devices?Pete Eddy