Am Dienstag, 5. August 2003 09:10 schrieb mama:
> Hello
>
> Could yout point me a reason why grabbing datas from usb device these datas
> includes some incorrect numbers ? Is it synchronization or what ??
>
> I put it in my endpoint2 fifo buffer incrementing datas ( from 1 to 64).
> I wrote a device driver and I use it to read these datas from.
>
> I insert fragment of my device driver .. please tell me what I'm doing wrong
> ?
>
> frame_size = 64 .
> endpoint_r = 82H .
>
> static ssize_t fx2_read (struct file *file, char *buf, size_t count, loff_t
> *ppos)
> {
> if ( buffersNotAllocated ) AllocateBuffers(); //these are my
> defined functions
> ssize_t retval = 0 ;
> sRead.nOffset = 0;
> retval=usb_bulk_msg (my_dev, usb_rcvbulkpipe
> (my_dev,endpoint_r),sRead.pBuff, frame_size, &count, HZ*5);
> wait_for_urb (sRead.pUrb);
Either use usb_bulk_msg() _or_ submit and wait on an URB.
Secondarily, you fail to handle AllocateBuffers() failing.
HTH
Oliver
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