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

[Stephen Dawson-Haggerty]

On Mon, Feb 16, 2009 at 2:50 PM, Razvan Musaloiu-E. <razvanm at cs.jhu.edu>wrote:

> Hi!
>
> On Mon, 16 Feb 2009, Stephen Dawson-Haggerty wrote:
>
>  I don't know what other tests people have run, but at least in my
>> experience
>> (all on linux) 115200 seems to have more dropped packets and be less
>> stable
>> when you're sending quickly.
>>
>
> In which direction did you see this? In my case I see dropped packets when
> I send from PC to the mote. The other direction (from the mote to PC) seems
> fine. Which is probably why many people don't have big issues with 115200.
> :P



I think I agree with you-- packets make it to the pc just fine but they get
dropped on the way to the mote.

This seems consistent with what Eric said about the receive path being a
little too long on the mote-- presumably the pc doesn't have this problem.

Steve


>
>
> I didn't had time to do more tests beside the program that I sent at the
> beginning at this thread.
>
> --
> Razvan ME
>
>
>  I haven't run any micro tests on this, though; I'd be happy to if someone
>> has one.  Perhaps the cygwin serial is going to be equally unreliable at all
>> rates...
>>
>> This mail thread seemed to end without resolution, so I'm also curious
>> about
>> what happened...
>>
>> Steve
>>
>> On Mon, Feb 16, 2009 at 2:09 PM, Philip Levis <pal at cs.stanford.edu>
>> wrote:
>>
>>
>>> On Feb 16, 2009, at 1:26 PM, Stephen Dawson-Haggerty wrote:
>>>
>>>  Everybody seems to have agreed that the default msp430 uart speed should
>>>
>>>> be 57600-- can somebody in core make the change?  It is definitely much
>>>> more
>>>> reliable at the slower baud rate...
>>>>
>>>> Best,
>>>> Steve
>>>>
>>>>
>>>>  Hold on -- I think we went over this a long long time ago, and found
>>> out
>>> the problem was Cygwin, not TinyOS per se. Can someone summarize the
>>> tests
>>> that have been run (read/write load, host OS)? The mail thread doesn't
>>> seem
>>> to have much detail.
>>>
>>> Phil
>>>
>>>
>>
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