Re: GPS based on SIM68M chip

[Gary E. Miller]

Yo Nick!

On Fri, 5 Feb 2021 10:34:47 +0000
Nick Taylor <nicktaylor@dataskill.uk> wrote:

> I am working on a project using a custom TI 43xx armhf platform using 
> the SIM68M GPS chip:
> https://www.simcom.com/product/SIM68M.html

My condolences.  All their doc requires a login, which I do not have.

> Wondering whether someone can confirm the support level of this chip 
> within gpsd, from what I gather from Gary Miller, support for multi 
> system receivers in gpsd is still being developed.

I can confirm we have never heard of it before.  Without documentation
hard to say anything about it.  The HTML says it may be an MTK 3333 or
MTK 3337.  gpsd has some support for MTK.

> I'm attaching debug log from gpsd -D9 and output from gpspipe in case 
> that provides info about the standards used within the SIM68M

Can't tell standards compliance from logs.  That requires doc.

I can verify is it NOT working with your gpsd:

gpsd:UNK: Packet type 1 accepted 85 = 
$GPGRS,100300.000,1,4.17,-2.23,2.08,9.39,-8.72,4.76,0.48,9.77,-4.48,-1.76,-4.09,*4F\x0d\x0a
gpsd:UNK: Packet discard of 85, chars remaining is 14 = $GPGST

When gpsd has to discard input, that is bad.

> If it will help with development, we may be able to discuss the 
> possibility of donating one of our devices to the development team,
> or alternatively financial donation to the cause...

That would be nice.

RGDS
GARY
---------------------------------------------------------------------------
Gary E. Miller Rellim 109 NW Wilmington Ave., Suite E, Bend, OR 97703
        gem@rellim.com  Tel:+1 541 382 8588

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    "If you can't measure it, you can't improve it." - Lord Kelvin

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