[Tinyos-devel] again about the baudrate issue for telos

[Andreas Köpke]

Am Donnerstag, den 04.09.2008, 00:13 -0700 schrieb Eric Decker:
> 
> 
> On Wed, Sep 3, 2008 at 11:40 PM, Andreas Köpke
> <koepke at tkn.tu-berlin.de> wrote:
>         You try to send 115200 at the same time in _both_ directions.
>         That is
>         indeed a problem.
> 
> 
> Why do you say this?  It is full duplex.  And if the interrupt service
> time wasn't so
> long it should work.  
> 
> 
> So what are you hinting at?
> 
> 
> eric

The ISR time is short enough for half-duplex, but too long for
full-duplex. 

>         
>         Am Mittwoch, den 03.09.2008, 18:40 -0400 schrieb Razvan
>         Musaloiu-E.:
>         
>         > Hi!
>         >
>         > I attached a small application and a Python testing script
>         that shows that
>         > 115200 doesn't work reliably for telos. The nesC application
>         is sending
>         > packets back to back while the script will accept all the
>         incoming packets
>         > and tried from time to time to send some (one at a time).
>         Using the 57600
>         > (enabled by default in the application) the acks work
>         properly. When the
>         > 115200 is enabled the acks stop working (or they come very
>         infrequently).
>         >
>         > This issue was discussed before [1] but no solution surface
>         from that. In
>         > this context I think it would be good to switch to safer
>         57600 rate for
>         > now. Is anybody against this? :P
>         >
>         > Note: I don't have a Windows TinyOS installation so I only
>         tested on Linux
>         > on real machines and VMWare.
>         >
>         > [1]
>         http://mail.millennium.berkeley.edu/pipermail/tinyos-devel/2008-April/thread.html#2651
>         >
>         > --
>         > Razvan ME
>         
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> 
> 
> 
> -- 
> Eric B. Decker
> Senior (over 50 :-) Researcher
> Autonomous Systems Lab
> Jack Baskin School of Engineering
> UCSC
> 
>