Re: Accessing GPS on Nokia N810
Please don't take this topic off list. Andrew Daviel [EMAIL PROTECTED] [2008-03-10 17:07:14]: I probably did ps ax instead of ps axw and truncated the command line - no wonder I could not find the device. So if that emits NMEA 0183, gpsd translates it to tcp where multiple clients can access it at once. I notice gpsdriver is running all the time before the map program is started. I wonder why. Because 'gpsdriver' seems to be some kind of middleware between userspace applications and kernel driver. It powers On/Off the GPS, uploads also something like GPS Almanac data from /var/lib/gps/nvd_data to GPS driver and it seems, that it also writes back this blob when the GPS is about to shutdown. Do you happen to know where the N810 keeps its battery information. /dev/acpi/battery like on my laptop does not exist . No, but there's battery applet which needs to read that info from somewhere... -- ynezz ___ maemo-users mailing list maemo-users@maemo.org https://lists.maemo.org/mailman/listinfo/maemo-users
Re: Accessing GPS on Nokia N810
Petr Stetiar wrote: Because 'gpsdriver' seems to be some kind of middleware between userspace applications and kernel driver. It powers On/Off the GPS, uploads also How does it power the GPS on/off? I.e. how do you ask it to do it? -- Tuomas signature.asc Description: OpenPGP digital signature ___ maemo-users mailing list maemo-users@maemo.org https://lists.maemo.org/mailman/listinfo/maemo-users
Re: Accessing GPS on Nokia N810
Tuomas Kulve [EMAIL PROTECTED] [2008-03-11 10:26:50]: Petr Stetiar wrote: Because 'gpsdriver' seems to be some kind of middleware between userspace applications and kernel driver. It powers On/Off the GPS, uploads also How does it power the GPS on/off? I.e. how do you ask it to do it? That's what I want to find out. I'm quite lost in strace's output, since there are some unknown syscalls used like SYS_284 and SYS_285, and I didn't find out what they're yet. I don't have the systrace's output here, but it's something like this - if for example 'navicore' want access to GPS, it write's somehow 'P 3\n' to gpsdriver and gpsdriver powers on GPS using GPS GPIO's in /sys (you can find them easily by using strings on gpsdriver binary), uploads nvd_data file, creates /dev/pts/X device and makes /dev/pgps symlink to it and then starts gpsd daemon using this /dev/pgps device. Then if 'navicore' don't want to use GPS device, so it writes 'P 0\n' to gpsdriver somehow and gpsdriver powers off the GPS device. -- ynezz ___ maemo-users mailing list maemo-users@maemo.org https://lists.maemo.org/mailman/listinfo/maemo-users
Re: Accessing GPS on Nokia N810
Tuomas Kulve wrote: Petr Stetiar wrote: Because 'gpsdriver' seems to be some kind of middleware between userspace applications and kernel driver. It powers On/Off the GPS, uploads also How does it power the GPS on/off? I.e. how do you ask it to do it? In all normal situations you'd use system libraries that do it for you (like liblocation, I suppose). If you really want to do it by hand, take a look at gpsctrl.h: gpsctrl_set_chip_on() gpsctrl_set_chip_off() Somewhat surprisingly this is in libgpsbt-package. Jussi ___ maemo-users mailing list maemo-users@maemo.org https://lists.maemo.org/mailman/listinfo/maemo-users
Re: Accessing GPS on Nokia N810
Jussi Kukkonen wrote: Tuomas Kulve wrote: Petr Stetiar wrote: Because 'gpsdriver' seems to be some kind of middleware between userspace applications and kernel driver. It powers On/Off the GPS, uploads also How does it power the GPS on/off? I.e. how do you ask it to do it? In all normal situations you'd use system libraries that do it for you I think we not now talking about normal (maemo) situations, at least I'm not :) In normal maemo glib environment, I recommend using liblocation. -- Tuomas signature.asc Description: OpenPGP digital signature ___ maemo-users mailing list maemo-users@maemo.org https://lists.maemo.org/mailman/listinfo/maemo-users
Re: Accessing GPS on Nokia N810
Andrew Daviel [EMAIL PROTECTED] [2008-03-10 12:08:40]: I built cgps from the gpsd toolkit, which can get data from gpsd if it's running. If I start the Nokia map, gpsd starts up. But I can't see how to start it manually - if I try, it says GPS device /dev/pgp nonexistent or can't be read That /dev/pgps device is just symlink to /dev/pts/X created by gpsdriver on demand done via D-Bus and Unix socket probably. I'm investigating it further with strace, because I would like to control GPS from scripts also. -- ynezz ___ maemo-users mailing list maemo-users@maemo.org https://lists.maemo.org/mailman/listinfo/maemo-users
