Re: [Libusb-devel] Am I setting up a read interrupt correctly ?

[Johannes E. <joh...@er...>]

On Sat, Mar 06, 2004, Scott Cowley <sco...@li...> wrote:
> What am I doing wrong here ?  HID device, (delorme earthmate):
> Thank you for any help!
> -------------------------------------------------------------------------
> struct usb_bus *bus;
> struct usb_device *dev;
> 
> int j;
> unsigned char rdstg[45];
> usb_dev_handle *udev;
> 
>   usb_init();
>   usb_find_busses();
>   usb_find_devices();
>   udev = usb_open(dev); /* (found on correct device) */ 
> 
> >>>>>  j = usb_interrupt_read( udev, 81, rdstg, 32, 16); <<<<<<
>   (j is returned as -1)

You probably want to use 0x81, not 81.

>     iInterface:         0
>       bEndpointAddress: 81h
>       bmAttributes:     03h
>       wMaxPacketSize:   32
>       bInterval:        6
>       bRefresh:         0
>       bSynchAddress:    0
>       bEndpointAddress: 02h
>       bmAttributes:     03h
>       wMaxPacketSize:   32
>       bInterval:        6
>       bRefresh:         0
>       bSynchAddress:    0

JE