Re: External GPS antenna question
BTW, anyone have any info on the radiation pattern of the internal antenna? Rúben Em Seg, Julho 6, 2009 13:31, Helge Hafting escreveu: > Tomasz Suchan wrote: >> Hi Armin, >> >>> I use the atenna for GPS Tracking during biking and car tours. >>> As the FR is always running (no sleep) and with activated GPS >>> module - the battery last about 4h - then it's empty. >> >> Is accuracy much better with external antenna? > > If the external antenna can be placed in a better location than the > internal one - or if it gets better signal strength. > > An external antenna on the car roof may see more satellites than the > FR sitting on the dashboard, because that metal roof block radio > transmission. > > Now, the FR will see many satellites even inside a car, but those > signals cannot penetrate directly through the roof. Some satellites will > be seen directly through windows. Signals from the rest may bounce off > the hood and come in through windows, or diffract (bend) around the roof > edge. Such redirected signals are weaker, and they give greater position > error. The latter because they really give the position where your FR > would have been, _if_ the signal had not been diffracted or reflected. > > The GPS receiver is smart, and will discard data from satellites that > seem to disagree with the rest. But there are two problems with this: > * An extra satellite that gets discarded no longer helps improving >accuracy. > * If two groups of satellites seems to disagree on position, then the >receiver could lock onto the wrong group for a while. > > An external antenna see all the satellites directly, and > don't suffer such problems. Unless you are near tall buildings or > mountainsides, which cause the same kind of problems. > > > So an external antenna is great if you have a roof above you. > Such as in a car or boat. The problems above don't happen on a bike. > Still, an external antenna might help, it may be bigger/better than the > internal antenna and get more from a weak signal. For example, if you > move around in heavy rain in a forest. > > Helge Hafting > > > > ___ > Openmoko community mailing list > community@lists.openmoko.org > http://lists.openmoko.org/mailman/listinfo/community > -- Rúben Leote Mendes -- ru...@netureza.pt ___ Openmoko community mailing list community@lists.openmoko.org http://lists.openmoko.org/mailman/listinfo/community
Re: Detecting headset button press
Em Qua, Abril 29, 2009 09:50, Rui Miguel Silva Seabra escreveu: > On Tue, Apr 28, 2009 at 10:51:22PM +0100, Ruben Leote Mendes wrote: >> I followed the Freerunner schematics and the heaset button seems to be >> connected to EINT7/GPF7 so it seems it is possible to find out in >> software >> if the button is pressed. >> >> What is the best way to do it? > > Hey finally playing with it? Cool! :D Sort of. It might seem strange but it's not for use as a phone that I want to read the headset button. I still use another phone for that. :-( -- Rúben Leote Mendes -- ru...@nocturno.org ___ Openmoko community mailing list community@lists.openmoko.org http://lists.openmoko.org/mailman/listinfo/community
Re: Detecting headset button press
Em Qua, Abril 29, 2009 09:47, Helge Hafting escreveu: > Ruben Leote Mendes wrote: >> Hi, >> >> I followed the Freerunner schematics and the heaset button seems to be >> connected to EINT7/GPF7 so it seems it is possible to find out in >> software >> if the button is pressed. >> >> What is the best way to do it? > > Check to see if it is interpreted as a normal key already. > enlightenment can assign some actions to keys, that is how the two > regular buttons are handled. Go into that setup, press the key and see > if you get a keycode. If so, you can assign an enlightenment action. > > If you want to use it outside of e, run something like "xev" to check > what keycode is produced. Then write software to listen for it. Thanks. I'll try that when I get my hands on a 2.5" 4-ring jack. I currently do not own a compatible headset, but have an application in mind that needs a push button because touchscreen is not an option. -- Rúben Leote Mendes -- ru...@nocturno.org ___ Openmoko community mailing list community@lists.openmoko.org http://lists.openmoko.org/mailman/listinfo/community
Detecting headset button press
Hi, I followed the Freerunner schematics and the heaset button seems to be connected to EINT7/GPF7 so it seems it is possible to find out in software if the button is pressed. What is the best way to do it? Thanks. -- Rúben Leote Mendes -- ru...@nocturno.org ___ Openmoko community mailing list community@lists.openmoko.org http://lists.openmoko.org/mailman/listinfo/community
Re: [2008.12] Help with Om.2008.12 on microsd
Em Ter, Dezembro 30, 2008 14:51, Ed Kapitein escreveu: > did you try so set the glamo_mci.sd_max_clk, acording to: > http://docs.openmoko.org/trac/ticket/1743 ? I solved the problem with Andy's suggestion of removing "ro" from u-boot (see another message I just sent). This was with an 8GB card from Kingston. I tried the glamo_mci.sd_max_clk with another card I have (Transcend 4GB) that doesn't work and it did not help. Any other tricks that I should try to get this card to work? -- Rúben Leote Mendes -- ru...@nocturno.org ___ Openmoko community mailing list community@lists.openmoko.org http://lists.openmoko.org/mailman/listinfo/community
Re: [2008.12] Help with Om.2008.12 on microsd
Em Ter, Dezembro 30, 2008 14:26, Andy Green escreveu: > I was just meddling with this in NAND, I believe that "ro" on the kernel > commandline is fatal for startup of 2008.12. When I removed it from Qi, > 2008.08 started up OK. > > So check your U-Boot env if you're using that for "ro", or try adding rw > to /boot/append-GTA02 if you are on SD Card and Qi. That's it. Removed "ro" from u-boot and 2008.12 started fine. Thanks! -- Rúben Leote Mendes -- ru...@nocturno.org ___ Openmoko community mailing list community@lists.openmoko.org http://lists.openmoko.org/mailman/listinfo/community
Re: [2008.12] Help with Om.2008.12 on microsd
Em Sab, Dezembro 27, 2008 04:06, Kosa escreveu: > I've been trying to boot 2008.12 from a microsd but it just can't. > It starts booting but then it stops with an "Only GTA01 hardware > supported by ASoc driver" message. Happens to me also, but after that message I also have the following messages (not sure if they change from boot to boot): Unknown HZ value! (87) Assume 100. mount: special device /dev/mmcblkp01 does not exist ALSA: restoring mixer settings... Configuring network interfaces... /usr/sbin/alsactl: load_state:1327: No soundcards found... ADDRCONF(NETDEV_UP): usb0: link is not ready done. I can shutdown by holding the power button. I have FDOM in the same card and it works fine. Any clues? -- Rúben Leote Mendes -- ru...@nocturno.org ___ Openmoko community mailing list community@lists.openmoko.org http://lists.openmoko.org/mailman/listinfo/community
