hey folks,
i just added updates to the gps module driver (tos-1.x version, too)
that allow for more tuning of its output.
new commands are
restrictNMEASentences
resetNMEASentences
the first reduces the default output of six sentences to two (i chose
RMC and GGA). a comment above the code annotates the internal command
string so that you can make different combinations.
reset... just restores the default output.
the other two are
setNavThreshold
getNavThreshold
it turns out that the gps module has a filter on the ground speed output
that reports any value below 1 m/s as 0.00. setNavThreshold reduces
this to 0, which allows the module to report ground speeds all the way
down to its specified limit (0.1 m/s, or 0.05 m/s with a dgps fix).
of course, by peeking at the comment in the code, you'll be able to make
the threshold any of the supported values...
get... was added as a reality check.
pick up the update when you get a chance:
cd ~/tinyos-main/tos/platforms/shimmer2
svn update
while you're in there, you might want to update your entire tree, as
there have been a number of recent updates leading up to a tinyos release.
for tos-1.x users,
cd ~/tinyos-1.x/contrib/handhelds/tos/
cvs update interfaces lib
have fun,
steve
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