On Thu, Oct 18, 2012 at 12:31 AM, 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
Testing in Debian Squeeze 2.6.32-5-686 with the same hardware configuration doesn't show Problem 1 Note that: - Ubuntu 12.04 uses kernel 3.2.0 and the driver controlling the adapter is ftdi_sio: v1.6.0:USB FTDI Serial Converters Driver - Debian Squeeze uses kernel 2.6.32 and ftdi_sio: v1.5.0:USB FTDI Serial Converters Driver In Debian the problem observed is the following (opening the port the same as before) > srl_write(s,uint8(127)); srl_read(s,1) ans = 127 > srl_write(s,uint8(128)); srl_read(s,1) ans = 0 Should it go up to 255? ------------------------------------------------------------------------------ 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
