On Mon, 2019-08-19 at 04:24 -0400, James Richters wrote: > I've been reading about libusb here: > https://www.cs.unm.edu/~hjelmn/libusb_hotplug_api/group__syncio.html > > some things I just don't really understand, I'm hoping someone can explain:
I can't help with the details, but these sites are very informative, especially the first one is nicely readable, the other has lots of details: http://www.usbmadesimple.co.uk/index.html https://www.beyondlogic.org/usbnutshell/usb1.shtml > The wValue, wIndex and wLength fields values should be given in host-endian > byte order. > What does host-endian byte order mean?? > > wLength > the length field for the setup packet. The data buffer should be at least > this size. > > What is this length supposed to be? I've been using the length of the data > I'm trying to send... so trying to send 8 bytes, I made it 8... but maybe > it's wanting some other length? > > It seems to me that there would be little point in asking for this value if > it was always just the length of the data field because the function could > just get len(data) on it's own, so why bother passing something so obvious > as a parameter... this leads me to wonder if this length needs to be > something else? > > James > _______________________________________________ > fpc-pascal maillist - fpc-pascal@lists.freepascal.org > https://lists.freepascal.org/cgi-bin/mailman/listinfo/fpc-pascal -- Marc Santhoff <m.santh...@web.de> _______________________________________________ fpc-pascal maillist - fpc-pascal@lists.freepascal.org https://lists.freepascal.org/cgi-bin/mailman/listinfo/fpc-pascal
