[ntp:questions] Sure GPS: Programming it now works

Terje Mathisen "terje.mathisen at tmsw.no" at ntp.org
Fri Apr 8 08:57:36 UTC 2011


Uwe Klein wrote:
> Terje Mathisen wrote:
>
>> I have tested and verified that at least my Sure board does not allow
>> me to ask for most of the 19 NMEA sentences listed in the 314 command:
>> Turning on all actually resulted in 5 or 6.
>>
>> I'll try again after first setting the board to 38400 baud. (Maybe it
>> only allows those sentences that actually fit inside the output window?)
> just toggle on one sentence at a time ?

I can try that as well, but it really does seem like this is the full 
list of what you can get (notice PMTKCHN has room for up to 32 sats!)

$PMTKCHN,23322,32182,11382,31272,24282,20192,17432,13252,25031,50001,04001,12031
,00000,00000,00000,00000,00000,00000,00000,00000,00000,00000,00000,00000,00000,0
0000,00000,00000,00000,00000,00000,00000*44<CR><LF>
$GPGGA,084714.072,5955.1009,N,01038.4483,E,1,8,1.23,-13.1,M,40.8,M,,*48<CR><LF>
$GPGLL,5955.1009,N,01038.4483,E,084714.072,A,A*57<CR><LF>
$GPGSA,A,3,23,32,11,31,24,20,17,13,,,,,1.51,1.23,0.88*05<CR><LF>
$GPGSV,3,1,12,20,81,156,19,32,56,095,18,23,49,189,32,24,35,150,28*7D<CR><LF>
$GPGSV,3,2,12,17,35,254,43,31,33,070,27,04,26,301,,11,18,161,38*79<CR><LF>
$GPGSV,3,3,12,13,16,205,25,12,12,344,,25,09,023,,50,,,*46<CR><LF>
$GPRMC,084714.072,A,5955.1009,N,01038.4483,E,0.15,31.45,080411,,,A*5B<CR><LF>
$GPVTG,31.45,T,,M,0.15,N,0.28,K,A*00<CR><LF>
$GPZDA,084714.072,08,04,2011,,*53<CR><LF>

What I have found though, by trial & error, is that my board can run at 
a little over 3 Hz:

I can ask for any update interval from 307 ms and up, so 333 ms is fine.

When I ask for 200 ms (5Hz) I get a '2' response, i.e. command was OK 
but could not be executed.

Terje
-- 
- <Terje.Mathisen at tmsw.no>
"almost all programming can be viewed as an exercise in caching"




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