The device is CDC-ACM compatible.
I actually send him an AT command, waiting to see a response + OK (which
works fine for len>10).
I suspect that the device itself is not the problem here.
At 04:11 AM 9/23/01 -0700, Matthew Dharm wrote:
>Are you sure that the device supports only reading one byte back? Many
>devices are broken and will bus-babble or otherwise do bad things under
>these conditions. In general, you have to be careful when reading less
>than a full packet of data.
>
>Matt
>
>On Sun, Sep 23, 2001 at 01:03:48PM +0200, Gilad Bornstein wrote:
> > When ever I'm trying to read from a bulk end-point fewer bytes then the
> > ones which are available I get a broken-pipe signal.
> > My program is something like:
> >
> > fd = open("/proc/bus/usb/001/007",O_RDWR);
> > int interface = 0;
> > ret = ioctl(fd, USBDEVFS_CLAIMINTERFACE, &interface);
> >
> > // Write something to the write end-point
> > // .
> > // .
> > // .
> >
> > // Read the response
> > struct usbdevfs_bulktransfer bulk;
> > char buf[255];
> > bulk.ep = 0x8a;
> > bulk.len = 1;
> > bulk.timeout = 500;
> > bulk.data= (void*)&buf;
> > int ret = ioctl(fd,USBDEVFS_BULK,&bulk);
> >
> > Since there are 10 bytes waiting for me in the buffer, I get a broken-pipe
> > error message. If I change the bulk.len line to be >=10 then it works
> fine.
> > What should I do in-order to support "short" reads?
> >
> > Thanks,
> >
> > -- Gilad
> >
> >
> > _______________________________________________
> > [EMAIL PROTECTED]
> > To unsubscribe, use the last form field at:
> > https://lists.sourceforge.net/lists/listinfo/linux-usb-devel
>
>--
>Matthew Dharm Home:
>[EMAIL PROTECTED]
>Maintainer, Linux USB Mass Storage Driver
>
>It was a new hope.
> -- Dust Puppy
>User Friendly, 12/25/1998
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