On Sat, Oct 20, 2012 at 3:11 AM, Andrius Sutas <andrius.su...@gmail.com> wrote: > On Wed, Oct 17, 2012 at 11:31 PM, Juan Pablo Carbajal > <ajuanpi+...@gmail.com> wrote: >> >> Hello, >> >> I am observing weird behaviors and I couldn't pin down at which level >> things are going bad. Using instrument-control 0.1.0 from Forge. >> Running Ubuntu 12.04 64 bit >> Linux 3.2.0-32-generic #51-Ubuntu SMP Wed Sep 26 21:33:09 UTC 2012 >> x86_64 x86_64 x86_64 GNU/Linux >> >> I am using serial communications. I am testing with a physical >> loopback (RxD connected to TxD) in this USB2Serial adapter >> https://www.sparkfun.com/products/718. >> >> Problem 1 [Ring bufffer?]: >> s = serial (); # 8-N-1 >> srl_baudrate (s,9600); >> >> srl_write(s,"hello") >> ans = 5 >> >> char(srl_read (s,5)) >> ans = hello >> >> char(srl_read (s,5)) >> ans = hello >> >> char(srl_read (s,15)) >> ans = hellohellohello >> >> char(srl_read (s,4)) >> ans = hell >> >> char(srl_read (s,6)) >> ans = ohello >> >> It looks like as if the buffer is a ring buffer or is really big and >> filled with "hello". Maybe flushing the input after reading will solve >> the problem? Continued from the example before I got this >> >> Problem 2 [Hang after flush]: >> srl_flush (s, 1) >> >> char(srl_read (s,5)) # This blocks as expected but ... >> srl_read: Interrupting... >> ans = >> >> srl_write(s,"hello") >> ans = 5 >> >> char(srl_read (s,5)) # This also blocks!!!! >> srl_read: Interrupting... >> ans = >> >> The only way of getting things to work from this point on is to close >> the port and open it again. >> >> Can anybody reproduce this? any suggestions of tests to run to see >> whether the problem is at hardware level? >> >> I also tested with a virtual loopback (command "socat -d -d PTY: >> PTY:", this is simpler than the suggestion in the wiki. I can update >> that), I do not observe Problem 1, but I can't interrupt the second >> call to srl_read >> >> s = serial("/dev/ptmx", 9600); >> srl_write(s,"hello") >> ans = 5 >> char(srl_read (s,5)) >> ans = hello >> octave:5> char(srl_read (s,5)) >> srl_read: Interrupting... >> srl_read: Interrupting... >> srl_read: Interrupting... >> srl_read: Interrupting... >> >> >> Thanks >> >> >> ------------------------------------------------------------------------------ >> Everyone hates slow websites. So do we. >> Make your web apps faster with AppDynamics >> Download AppDynamics Lite for free today: >> http://p.sf.net/sfu/appdyn_sfd2d_oct >> _______________________________________________ >> Octave-dev mailing list >> Octave-dev@lists.sourceforge.net >> https://lists.sourceforge.net/lists/listinfo/octave-dev > > > UPDATE: I did replicate the bug eventually. I can not reproduce it > consistently, will look further into this behavior.
Hi, Thanks for taking action. I tested again the following commands (Ubuntu 12.04 Linux 3.2.0-32-generic, FT232RL) Ring buffer http://agora.octave.org/snippet/Xd6x/ Read hangs after flush http://agora.octave.org/snippet/mu7J/ Weird data handling http://agora.octave.org/snippet/62x8/ Still working unsatisfactorily. Cheers, JPi ------------------------------------------------------------------------------ Everyone hates slow websites. So do we. Make your web apps faster with AppDynamics Download AppDynamics Lite for free today: http://p.sf.net/sfu/appdyn_sfd2d_oct _______________________________________________ Octave-dev mailing list Octave-dev@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/octave-dev
