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
>
>
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UPDATE: I did replicate the bug eventually. I can not reproduce
it consistently, will look further into this behavior.
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