[Tinyos-devel] FTSP testing result

[Branislav Kusy]

> The current version of FTSP has a quantization bug in it while
> calculating the sum of squares. Therefore, the time synchronization
> error is always around +/- 4ms. I attached a patch to this email which
> fixes this. Not sure if this helps with your problems though.
it's interesting this bug didn't come up earlier. i guess because 
everybody used TMicro, or T32khz before - so it wasn't a big deal as the 
quantization error was on par with the timestamping error. nice catch!

i think the problems are in timestamping. i modified cc2420 radio stack 
to fix some timestamping bugs last year, but it seams it didn't 
propagate to the CVS head. should i just go ahead and commmit it? owners 
of the stack should take a look. only two files were modified:
http://tinyos.cvs.sourceforge.net/viewvc/*checkout*/tinyos/tinyos-2.x-contrib/stanford-lgl/apps/tests/TestPacketTimeStamp/CC2420ReceiveP.nc?revision=1.2
http://tinyos.cvs.sourceforge.net/viewvc/*checkout*/tinyos/tinyos-2.x-contrib/stanford-lgl/apps/tests/TestPacketTimeStamp/CC2420TransmitP.nc?revision=1.2

brano