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04:54.50 | DocScrutinizer05 | sounds pretty recent |
04:56.27 | DocScrutinizer05 | whether it's "stable" or not is another question |
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05:32.43 | pabs3 | hmm at http://shr-project.org/trac/wiki/Rock-solid%20Farewell%20Release%20%28GTA02%29 |
05:34.59 | DocScrutinizer05 | >>pretty much lost its initial fraction<< hmm indeed |
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09:23.20 | PaulFertser | dos11: hi |
09:23.40 | PaulFertser | dos11: regarding wifi, do you remember my mail with "tips and tricks" for ar6001? |
09:25.12 | PaulFertser | dos11: regarding fso-gpsd, hm, why? Upstream gpsd doesn't save ephemeris, that's true. But in general it seems like a saner solution. |
09:26.19 | dos11 | PaulFertser: hello, but sorry, have to go |
09:26.29 | dos11 | I don't rememeber, but I'll check it later |
09:27.03 | dos11 | fso-gpsd - well, looks like gps doesn't work oob now (at least here), so read that as just "fix gps", either with gpsd or fso-gpsd :) |
09:27.21 | PaulFertser | dos11: please ping me if you have any questions. |
09:27.35 | PaulFertser | dos11: i have issues with gps myself but i suspect hardware failure |
09:27.45 | PaulFertser | dos11: it feel like my antenna has reduced sensitivity :/ |
09:27.49 | dos11 | sure, thanks, cya :) |
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09:44.01 | DocScrutinizer05 | agps broken? |
09:44.40 | DocScrutinizer05 | we recently seen quite a few messups with agps servers |
09:45.36 | DocScrutinizer05 | and I'd wonder if and how gta02 is using agps data, and which. I guess ublox no longer supports their supl server |
09:45.49 | DocScrutinizer05 | s/agps server/SUPL/ |
09:46.05 | PaulFertser | DocScrutinizer05: not agps, but we do not even have flash to save current ephemeris and almanac on gps module itself, so it's recommended to store them on disk before powering i off. |
09:46.28 | PaulFertser | I'm not sure about the supl server, it used to work, but I have no clue what's going on with it now. |
09:46.34 | DocScrutinizer05 | sure, that's how many gps work |
09:47.50 | PaulFertser | There're dirt-chip mtk3329 devices on the market that have embedded flash, integrated antenna, that are smaller and way more sensitive than our ublox. |
09:47.57 | DocScrutinizer05 | n900 agps recently borked. not even supl.google.com did work anymore (supl.nokia.com been broken since quite some time), but it turned out it been a expired or messed up cert in N900 cert store |
09:48.26 | PaulFertser | DocScrutinizer05: have you seen http://www.u-blox.com/en/positioning-antennas/gnss-antenna-modules/uc530.html ? |
09:48.45 | DocScrutinizer05 | no, what's exciting about it? |
09:49.41 | PaulFertser | Very small and very sensitive at the same time |
09:49.49 | DocScrutinizer05 | nice |
09:50.24 | PaulFertser | Tracking: –165 dBm Cold start: –148 dBm |
09:50.41 | DocScrutinizer05 | I'd be already happy when the Option modules came with embedded LNA |
09:50.56 | PaulFertser | Heh |
09:51.16 | DocScrutinizer05 | building a LNA is kinda PITA |
09:51.59 | PaulFertser | I very much hope you'll finally find the way to fit some module in n900 case. |
09:52.00 | DocScrutinizer05 | a LNA module would actually be sth nice to find |
09:52.21 | DocScrutinizer05 | ooh, the fit is already solved |
09:52.48 | DocScrutinizer05 | we go completely bonkers and extend the case ;-P |
09:53.41 | DocScrutinizer05 | or - maybe - we just move the SIM tray a bit and cut a hole for it |
09:54.01 | DocScrutinizer05 | and dig a hole into PCB for the Option |
09:55.51 | DocScrutinizer05 | but we need a LNA to use the intergrated GPS which otherwise is really fine |
09:56.13 | DocScrutinizer05 | GPS&GLONASS combined |
09:56.31 | DocScrutinizer05 | just like the uBlox |
09:59.29 | PaulFertser | PCB holes are cheap |
09:59.45 | DocScrutinizer05 | actually I don't get it if uBlox uc530 is glonass and (us)gps combined. And it seems to provide no assisted mode, cold and warm TTFF 31s is a tad long |
10:00.16 | PaulFertser | TTFF of 31s is excellent when you have no supl data |
10:00.29 | DocScrutinizer05 | yes, that's what I say |
10:00.42 | DocScrutinizer05 | for a phone you want supl |
10:01.24 | DocScrutinizer05 | when you start an app that's location aware, user hardly wants to wait half a minute for it to warm up |
10:02.00 | DocScrutinizer05 | here: heat up |
10:02.22 | PaulFertser | http://www.gtop-tech.com/en/product/AGPS-Assisted-GPS/Software_Services_07.html they say they support mt3339 |
10:02.38 | PaulFertser | I've never used agps on my gta02 :/ |
10:03.32 | DocScrutinizer05 | ooh, and it doesn't support GLONASS |
10:05.47 | DocScrutinizer05 | then OTOH 45mW isn't too much |
10:06.20 | PaulFertser | Glonass meh, does it work anywhere? |
10:06.36 | PaulFertser | I'm not proposing that gps module for neo-n900 anyway :) |
10:07.35 | DocScrutinizer05 | well, it seems glonass is a nice supplementary to gps |
10:08.00 | DocScrutinizer05 | and 10mA is quite nice but too much to keep it always on |
10:08.01 | PaulFertser | I was just shocked when I saw such a tiny module with integrated antenna. |
10:08.12 | DocScrutinizer05 | hehe |
10:08.31 | PaulFertser | This one has some autonomous logging facilities. |
10:09.27 | PaulFertser | It's funny how ublox sells chinese MTK devices now :) |
10:09.29 | DocScrutinizer05 | yep |
10:09.42 | DocScrutinizer05 | hm, chinese devices? |
10:10.05 | DocScrutinizer05 | ooh I see |
10:10.21 | DocScrutinizer05 | you say it's based on mtk3339? |
10:11.36 | PaulFertser | Yes |
10:16.22 | DocScrutinizer05 | I don't get it why ublox doesn't support agps |
10:16.45 | PaulFertser | It should support agps, why do you think it doesn't? |
10:17.06 | DocScrutinizer05 | because of the 31s cold and warm TTFF |
10:18.32 | PaulFertser | That's unassisted case |
10:18.35 | PaulFertser | I think |
10:19.10 | DocScrutinizer05 | yes, that's why I think they don't offer / support A |
10:19.34 | DocScrutinizer05 | NB they state best case values |
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10:20.27 | DocScrutinizer05 | though the gtop page says 41s is minimum for unassisted |
10:20.34 | DocScrutinizer05 | is puzzled |
10:21.15 | DocScrutinizer05 | anyway I just tested N900 and it got a fix in 15s thru the closed window |
10:22.09 | PaulFertser | Great stuff, agps works. |
10:23.54 | DocScrutinizer05 | yeah, and on second test it took 1s |
10:24.09 | DocScrutinizer05 | to get 5 sats |
10:24.23 | DocScrutinizer05 | stored data |
10:25.11 | DocScrutinizer05 | the u530 seems incapable of either. And it's not what this module is made for. It's made to run 16h continuously |
10:29.38 | PaulFertser | I'm not so sure. uc530 stores data, so for 2 hours it should be able to get a fix really fast. |
10:30.07 | PaulFertser | And it's most probable that it supports agps too. |
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10:41.12 | DocScrutinizer05 | datasheets says "no" |
10:42.07 | DocScrutinizer05 | err, it says nothing |
10:43.11 | DocScrutinizer05 | Receiver type MT3339 engine |
10:43.12 | DocScrutinizer05 | <PROTECTED> |
10:43.14 | DocScrutinizer05 | <PROTECTED> |
10:43.34 | DocScrutinizer05 | Acquisition Cold starts: 31 s Warm starts: 31 s Hot starts: 1 s |
10:44.32 | DocScrutinizer05 | it has backup voltage input, so it probably stores some data for "hot" |
10:44.50 | DocScrutinizer05 | dunno what's their definition of cold, warm, hot though |
10:46.48 | DocScrutinizer05 | protocols: NMEA, RTCM (whatever that means, does that include AGPS data upload?) |
10:47.38 | DocScrutinizer05 | well, this pamphlet doesn't give away a lot |
10:48.10 | PaulFertser | Mediatek, sigh :/ |
10:49.07 | PaulFertser | http://www.gizchina.com/2013/07/23/how-to-fix-poor-gps-on-mediatek-phones/ they seem to be able to use some assisted data |
10:50.15 | DocScrutinizer05 | how is that related? |
10:50.18 | PaulFertser | ftp://ftp.leadtek.com.tw/gps/9023/G-monitor%203.26/User%20Manual/EPO%20Format%20and%20Protocol/LEADTEK%20EPO%20Format%20and%20Protocol%20Reference%20Manual%20V1.0.pdf |
10:50.29 | PaulFertser | I'd guess all mediatek gpses to use the same protocol |
10:53.22 | PaulFertser | DocScrutinizer05: http://www.adafruit.com/datasheets/GlobalTop-FGPMMOPA6C-Datasheet-V0A-Preliminary.pdf here's data for the same MTK3339 chipset afaict. |
10:57.38 | DocScrutinizer05 | I don't expect a module to provide all capabilities of the chipset used |
10:59.19 | DocScrutinizer05 | e.g. only UC530M supports GLONASS |
11:00.19 | DocScrutinizer05 | http://www.u-blox.com/images/downloads/Product_Docs/UC530M_ProductSummary_%28FTX-HW-12002%29.pdf |
11:02.03 | DocScrutinizer05 | UC530M supports autonomous A-GPS, allowing a reductio nof the warm start TTFF by as much as 90%. |
11:03.00 | DocScrutinizer05 | Acquisition |
11:03.02 | DocScrutinizer05 | <PROTECTED> |
11:03.03 | DocScrutinizer05 | <PROTECTED> |
11:03.05 | DocScrutinizer05 | <PROTECTED> |
11:06.37 | DocScrutinizer05 | while IT530 comes without antenna, without GLONASS but with AGPS and some anit-jamming |
11:07.14 | DocScrutinizer05 | oops, withOUT AGPS |
11:07.35 | DocScrutinizer05 | err, what now? |
11:07.35 | PaulFertser | Hm, probably that's a firmware-only restriction? |
11:07.58 | DocScrutinizer05 | it says warm:31 but states it supports A-GPS??? |
11:08.40 | DocScrutinizer05 | weird |
11:08.45 | DocScrutinizer05 | ds-err |
11:08.55 | DocScrutinizer05 | http://www.u-blox.com/en/download/documents-a-resources/fastrax-gpsgnss-modules.html |
11:12.53 | DocScrutinizer05 | AHA and MAX-M5Q announces *concurrent* GPS and GLONASS |
11:13.13 | DocScrutinizer05 | and QZSS (whatever that is) |
11:18.22 | DocScrutinizer05 | funny enough it yields 3m CEP, while the 530 does 2(.5)m |
11:18.33 | DocScrutinizer05 | MT3333 |
11:24.00 | DocScrutinizer05 | actually if we hadn't the Option already, or when this one came with LNA built in... |
11:24.32 | DocScrutinizer05 | though 2.5mm is quite a statement |
11:25.09 | DocScrutinizer05 | not exactly trivial to integrate into Neo900 |
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18:13.08 | ayaka | I am doing some work with exynos 4412's hardware encoder, but I can't find many sample code about it, I hear that xbmc support it but I can't find it in its git |
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19:07.31 | dos1 | PaulFertser: funny stuff with ESSID |
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