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);
sRead.nLeft = sRead.pUrb->actual_length;
/* if the read was successful =0 , copy the data to userspace */
if (!retval) {
if (copy_to_user (buf, sRead.pBuff, sRead.nLeft))
retval = -EFAULT;
else{
retval = count;
}
}
}
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