Zachary, For your information, you don't need anymore to patch the kernel :p =>
https://github.com/RobertCNelson/linux-dev/commit/823fd45781f6e176ee1dc87062c95a010c7af588 On Tue, Jan 28, 2014 at 4:21 PM, Zachary Thorson <[email protected]>wrote: > >> Now, I have developed an application which is combination of both send >> and recv. I mean , after sending one byte on UART from BBB to other host >> machine, I just wait for input bytes to receive(added receive timepout at >> 10 sec). Now in this cae, even if I do not send any character from host >> machine, BBB detects one/two arbitary bytes. >> > > Could you clarify what you mean by this? I am assuming you are > essentially using one host as a master and one as the slave. Do you mean > when neither end is transmitting, you are seeing arbitrary bytes, or that > when the master sends a request out, you that same master sees bytes even > if nothing is transmitted by either host? > > If the random bytes are all 0's or all 1's (0x00, 0xFF) that might > indicate some problems in what the non-driven state of the line voltage is. > > If the bytes seem similar to what was being transmitted, you might be > getting reflections if the line is not terminated properly. > > This seems that driver changes GPIO position (from send mode to recv mode) >> before transmitte buffer gets empty. >> > > Is this a guess from the behavior, or did you watch the signal lines, or > use printk statements in the patch? > > >> Did any one has face this problem? Can you guys please share your >> thoughts on this? >> > > I have not seen this issue and have been using the patch at 38400 baud > with an ADM2582 chip for a number of months now. > > > > -- > For more options, visit http://beagleboard.org/discuss > --- > You received this message because you are subscribed to the Google Groups > "BeagleBoard" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > For more options, visit https://groups.google.com/groups/opt_out. > -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/groups/opt_out.
