Ah, sorry, I should have said in tos 1.x it's 29.
I wasn't aware that it appears to be all different in v2.
The main caviets are that longer messages have a higher
probability of getting a bit error which kills the whole
thing, and shorter messages have more header overhead.
Finding the right balance is of the essence.
MS
Tie Luo wrote:
/opt/tinyos-2.x/tos/types/message.h:7:#define TOSH_DATA_LENGTH 28
/opt/tinyos-2.x/tos/chips/cc2420/CC2420.h:70:#define TOSH_DATA_LENGTH 28
/opt/tinyos-2.x/tos/chips/xe1205/XE1205.h:102:#define TOSH_DATA_LENGTH 28
I did not find anywhere defining it to be 29.
p.s. If anyone point out the caveats of changing its value, I appreciate it.
Tie
On 10/15/06, *Michael Schippling* <[EMAIL PROTECTED]
<mailto:[EMAIL PROTECTED]>> wrote:
Where did you find 28? The 'main' tos/types/AM.h file defaults to 29.
And yes, you can change it. But search back on this list for caveats.
MS
Tie Luo wrote:
> It can be found in TinyOS source code that TOSH_DATA_LENGTH is
defined
> to be 28, but I found in this mail archive people are saying 29,
which
> one is correct?
>
> Another question is, since 802.15.4 supports up to 127-byte
packet, does
> that mean we can redefine TOSH_DATA_LENGTH to be larger, say 100, as
> long as the total packet size does not exceed 127?
> --
> Regards,
> Tie
>
>
>
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Regards,
Tie
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