hi andrea,
sorry it took awhile to get back to you (travel/meetings), but i sat
down to look at this and realized that you uncovered what could be
considered a bug; at the very least an oversight on my part.
the msp430 usart uses a register that is shared among bus modes to
indicate that rx or tx event completion. the gps driver uses this bus
as a uart, and has events that fire when either the tx or rx interrupt
flags is set, even though this event is triggered by spi activities
to/from the sd card.
anyway, i added a fix to the driver that will prevent interference with
the sd driver from the gps driver, and it is now checked into the
tinyos-main repository.
all, please pick up this fix:
cd ~/tinyos-main/tos/platforms/shimmer2/chips/fgpmmopa6b
svn update
thanks for your patience, and apologies for the confusion.
-steve
On 05/16/2011 12:45 PM, Andrea Grante wrote:
Hi Steve,
actually my JustFATLogging app breaks with just these two lines in
JustFATLoggingC:
components GpsC as GpsMod;
JustFATLoggingP.Gps -> GpsMod.Gps;
and of course adding
interface Gps;
and
async event void Gps.NMEADataAvailable(char * data) {}
in the JustFATLoggingP.
I'm not even wiring the GpsInit interface, nor I ever call its init, so
my app doesn't ever access to the GPS.
Can your application, with only such changes, write on the SD card on
your shimmer2r ?
Thanks again, kind regards,
Andrea.
2011/5/16 steve ayer <[email protected] <mailto:[email protected]>>
hi andrea,
just adding the hooks for the gps module won't break the app, but
before you call its init, you must disable the sd stuff, and vice-versa.
-steve
On 05/16/2011 06:06 AM, Andrea Grante wrote:
Hello Steve,
thank you for your help.
I already tried to call the init() on the GPS, then getting the
data,
disabling it by calling either disable() or disableBus(),
without success.
Anyway, if you just add in JustFATLoggingC
{
...
components GpsC as GpsMod;
JustFATLoggingP.GpsInit -> GpsMod.Init;
JustFATLoggingP.Gps -> GpsMod.Gps;
...
}
and in JustFATLoggingP
{
...
interface Gps;
interface Init as GpsInit;
...
async event void Gps.NMEADataAvailable(char * data) {}
...
}
the app stops working. It's enough to add those lines, without
enabling/initializing the GPS module.
When the shimmer2r is undocked, the three leds turn on, and when
docked
back, the control of the mote is lost and nothing is written on
the SD card.
Is there something wrong in my code?
Thank you again, regards,
Andrea.
2011/5/12 steve ayer <[email protected]
<mailto:[email protected]> <mailto:[email protected]
<mailto:[email protected]>>>
hi andrea,
the sd card and the gps daughter card use the same usart bus
on the
shimmer, so to use the two together, you'll have to cache
gps data
while the sd card is disabled, then stop receiving data from
the gps
(though i would not disable it), bring up the sd card, write
your
data, then switch back. bus multiplexing...
i hope that this helps,
steve
On 05/12/2011 09:15 AM, Andrea Grante wrote:
Hello,
I'm a master student and I'm trying to write an application
which stores
data from the GPS expansion on the SD card.
Although I use applications which store data on the SD card
succesfully
(like JustFATLogging, for instance), I'm having problems
using
the GPS
module in the same apps.
Even if I just list the GPS component in the
configuration file (not
even calling its init() ), SD card storage stops working.
How could I make the GPS and SD modules work together?
Thank you so much for your help, regards,
Andrea Grante.
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