Re: [Libphidget-devel] libphidget newbie post...

[Tom B. <tb...@ba...>]

On Sun, 29 Jun 2003 fit...@ph... wrote:

> 
> Hi Tom, jack, vadim,
> 
> > sorry, I have that (the protocol). I just didn't expect the
> > behaviour I got from the system for a buffer size mismatch.
> > AFAIK, I'm pretty much homefree from here, the rest should be
> > pretty trivial... just a case of finding another block of 5
> > hours...
> 
> It's not just a buffer mismatch; it's the length of the packet.

well, in most socket/file-descriptor communications it wouldn't be such a
big deal... having read through some of the kernel source, the libusb
code, and of course libphidget.c ... I think I'm ok now. I know I've been
remiss in not reading as much of the USB documentation as I should.

> Very good.
> 
> > is there somewhere were these magic constants like
> > "0x21, 0x09, 0x200" and the ones used to obtain the serial number
> > are described?
> 
> These are all HID commands.  0x21,0x09,0x200 is a SetReport packet.
> http://www.usb.org/developers/hidpage/

Thanks! 

> 
> Chester
> 
> 
> 
> 
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