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Aha! Found this in the Seeed WM1110_Geolocation repo:
Updated the rf switch table:
But the GNSS scan code doesn't set the rf switch table so have to add that... And the LR11x0::setRfSwitchTable doesn't seems to allow GPIO pins to be used. Hmmm... Gonna turn it on globally for now... With the LNA turned on I'm finally seeing some SVs:
But I mostly get a "demod status: -17" which the manual says is "20 ms real time failure". So far I have not found what that means... Other times I get 'The satellite selected for demodulation lost' (sic), or 'No bit change found during advanced scan', or 'Too many parity check found' (sic). I'm wondering whether there's something I'm missing that is required to cold-start the lr1110... Hmm, GnssReadTime says "No 32kHz clock available". Gotta look at schematics to see what I need to do to enable that. My WIP code is in the lr1110-gnss branch of my fork https://github.com/tve/RadioLib/tree/lr1110-gnss |
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I'm starting to accumulate some questions about the LR1110 operation for which I can't find answers... I've submitted a support request but have not heard back and may not hear back since I don't work for some big ass company... So far I have:
WRT the filtering, after a cold-start I've noticed the following: first fix:
(the real error is based on me having hard-coded the real GPS location and using the haversine formula) second fix:
What I find significant is:
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First le me say thank you for having started to implement the Gnss scanning for the LR1110!!! I got a WM1110 Tracker dev board and tried to use the Seed stuff, which was a total no-go 'cause they're stuck on the 3.x firmware, which doesn't support autonomous almanac updates or calculating a 2D fix. I spent a day trying to upgrade the software but it's just such a nightmare... Eventually it dawned on me that I might want to check RadioLib...
Anyway, I'm using master and am wondering whether there is any further progress in some fork or other repo?
If not, that's OK, I'll just plug away at implementing the stuff that I find missing. I've adapted the WiFi scan example and I now see a GNSS scan result in the debug output but so far it's not seeing any SV after 63 secs (I'm indoors with a "repeater" antenna and my phone does see the expected number of SVs). I'll start by reading the LR1110 docs to understand where I need to start...
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