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On Wed, 23 Jul 2003 07:28 am, William R. Dieter wrote:
> I admit I am not very familiar with USB details. I did look through the
> USB spec. and saw that low speed devices use 8 byte packets, so I am
> guessing this is a low speed device. The USB HID specification and the
> Linux HID documentation I found talked a lot about reports and
> endpoints, none of which are mentioned at all in the PIC documentation.
> It is not clear to me how the 8 byte packets in the PIC documentation
> map onto reports in hiddev API. Do I need to write my own kernel level
> driver that works at a lower USB layer than hiddev?
Probably not, although it helps enormously to know what you are actually
trying to do.
> Also I came across a small problem when trying the HIDIOCAPPLICATION
> ioctl example. The example code calls the ioctl and tests the return
> value like this:
>
> appl = ioctl(fd, HIDIOCAPPLICATION, yalv);
> if (appl > 0) {
> printf("Application %i is 0x%x ", yalv, appl);
> /* The magic values come from various usage table specs */
> switch ( appl >> 16)
> [...]
Probably I blundered, and should have made appl unsigned. However you have
messed up my code. Does it run if you use the code unmodified?
Brad
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