[ntp:questions] Sure GPS: Programming it now works
unruh at wormhole.physics.ubc.ca
Fri Apr 8 18:45:14 UTC 2011
On 2011-04-08, Terje Mathisen <"terje.mathisen at tmsw.no"> wrote:
> unruh wrote:
>> On 2011-04-07, Uwe Klein<uwe at klein-habertwedt.de> wrote:
>>> unruh wrote:
>>>> Somewhat more awkward than Terje's program, but it works.
>>> I've collected a bit of information
>>> and wrote a basic parser script:
>>> Terje added some info too.
>>> I will add the commands stuff to my script
>>> in ~10days. no time now.
>>> Feel free to add.
>> Actually a more complete set of instructions that can be sent under the
>> MTK protocol is in
>> I of course have no idea which of these are actually valid for the
>> particular chipset that the Sure board uses.
>> This list includes the command 251($PMTK251) --change serial bitrate command,
> This is the one I got by reverse engineering (sniffing) the java
> program, nice to see it documented.
>> missing from the ETEK list. It also includes a rich set of Datum for the models used.
>> I do not know if the Sure can be changed from the WGS1984 Datum, in case
>> anyone might want to use, for example, number 147 -- Old Egyptian(1907)
>> datum instead.
> 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.
IK, I was going to try that as well, only one at a time.
> 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?)
> The 590 returns the flash information, I suspect that this means that
> there is also a 390 to program it (including baud rate) and a 490 to
> query the current flash status, giving the 590 info as a response.
Yes. Under the above docs
Packet Type: 390 PMTK_API_SET_USER_OPTION
Packet Type: 490 PMTK_API_GET_USER_OPTION
Note it can be set up to give various nmea sentences but only 5 of them,
not all 19
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