IRC log for #maemo on 20200708

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11:28.42untakenstupidnicis it possible to connect mainstream headphones to n900?
11:29.00KotCzarnywhat is 'mainstream headphones'
11:29.06KotCzarnyyou mean bt4+ ?
11:29.10KotCzarnyor btle ?
11:30.09untakenstupidnicthe TRRS earlobes you would connect to the average android phone and it works
11:31.11KotCzarnyi guess there should be adapters for funky ring configs
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11:31.40untakenstupidniccouldn't it be solved in software?
11:31.59KotCzarnybut standard says you should be able to work, what problem you are having? no audio at all or just one side?
11:34.15untakenstupidnici think the standard nokia uses is different
11:34.32untakenstupidnicit gives a loud buzz when i connect it, have not tested it with sound
11:51.18sixwheeledbeastuntakenstupidnic: OMTP vs AHJ you can buy converters to flip R2 and S
11:51.22Wizzupuntakenstupidnic: yeah so the three ring is silly on the n900
11:51.32Wizzupyou're probably hearing 'tv out' :)
11:51.53KotCzarnyshouldnt it turn off on the n900's side automatically when it detects headphones?
11:52.03KotCzarnymight be that his headphones have weird impedance
11:52.08KotCzarnywhich doesnt trigger that
11:52.17sixwheeledbeasttv out wouldn't be active in "audio" mode AFAIK
11:52.58WizzupI very carefully pick headphones with two rings for my fremantle phone
11:53.03KotCzarnysimple fix would be getting 3--4 rings adapters
11:53.08Wizzupeverything else (apart from the nokia ones you get with them) are snafu
11:53.30sixwheeledbeastI only use nokia headset.
11:54.23sixwheeledbeastthey are pretty decent IMO. wh205 IIRC
11:57.53KotCzarnyhttps://www.aliexpress.com/item/32824341405.html
11:57.55KotCzarnyfor example
11:58.25KotCzarnyor similar
12:02.39sixwheeledbeastI would say https://www.ebay.com/itm/191478731018 is more suitable
12:06.24KotCzarnyanyway, its a possible solution
12:06.45KotCzarny2 rings might be better to short the video to gnd and make n900's detection work
12:06.53KotCzarnyand shutdown signal on it
12:08.59sicelo2 rings means what?
12:09.10KotCzarnyonly audio, old minijacks
12:09.27sicelostereo or mono?
12:09.30KotCzarnystereo
12:09.35KotCzarnyTRG
12:09.41KotCzarnyas opposed to TRRG
12:09.50sicelook
12:09.52KotCzarnymono would be TG
12:10.06KotCzarnyhmm
12:10.29KotCzarnyin that case it should be called 1 ring, so i guess to better stick to TxxG
12:10.44KotCzarnys/G/S/
12:10.57KotCzarnytip, ring, shield/ground
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12:32.35sixwheeledbeastA 2R to S crossover is just more useful to have than a 4 to 3 pole convertor but i imagine both should work for this purpose
12:33.02KotCzarnyall depends how that second ring is wired or not
12:33.15KotCzarnyand how n900 detects headphones vs tv
12:33.38sicelohp vs tv is detected using the 75-ohm impendance thing
12:33.46sixwheeledbeast^
12:35.20sixwheeledbeastheadphones = mic/ground is short, headset = mic has an impedence, tv out 75 ohm on video
12:35.38KotCzarnyisnt there a button too?
12:35.53KotCzarnywhich also abuses that additional ring
12:36.20sicelothe button shorts mic, iirc :)
12:36.27sixwheeledbeastheadset type state is set on plug in. button shorts the mic out
12:37.06KotCzarnyi suspect his headphones have impedance that is hovering around that 75ohm with some margin
12:37.51sixwheeledbeastI'd expect them to be much lower
12:38.36siceloKotCzarny: put in Samsung phone hp in your N900 .. it'll do what he's talking about. it's a known 'problem' - hence the convertor as suggested by sixwheeledbeast.
12:39.07sicelonot hp, headset (with mic)
12:39.39sixwheeledbeastit's the same for any device with the wrong 4pin type. Playstation 4 controller for example.
12:40.33sixwheeledbeastthis is why I say a OMTP to AHJ convertor is more useful.
12:41.12KotCzarnystill, ring-count adapter i would call it. unless it has some voodoo inside
12:41.43sixwheeledbeaster?
12:42.05KotCzarnyimpedance thingy?
12:43.38sicelothe convertor? it's just straight-through wires. nothing else
12:44.12sixwheeledbeastthe two things we posted do different jobs?
12:44.46sixwheeledbeastthey have not active components but are different
12:45.33KotCzarnyboth should short second ring to shield, no?
12:46.04sicelono. one will swap them.
12:46.11KotCzarnyhuh?
12:46.12sixwheeledbeastno
12:46.19KotCzarnythat would do the wrong thing
12:46.26sixwheeledbeastno
12:46.38sixwheeledbeastdifferent things but same goal
12:46.43sixwheeledbeastfor this purpose
12:46.59sicelomaybe the question is - what is the difference between AHJ and OMTP, in terms of wiring, that is
12:47.12sixwheeledbeast2r and S is flipped
12:47.32sixwheeledbeastthat's all the converter does cross them over
12:48.05sixwheeledbeast4 to 3 pin would short mic and ground at the adapter
12:48.05sicelohere's a picture, https://forums.windowscentral.com/attachments/windows-phone-8-how-guides/49276d1384087706t-headset.jpg
12:48.21KotCzarnyshouldnt it be backwards compatible?
12:48.55KotCzarnyhah, in this case you are right
12:48.59siceloso yes, if you need to use mic, you need to have the mic swapped out with ground. if you don't need mic, you can short the entire sleep
12:48.59sixwheeledbeastbackwards compatible? they are two different standards (blame apple)
12:49.10sicelosleeve
12:49.13KotCzarnyconverter might be better than just dumb trrs->trs
12:49.30sixwheeledbeastheadphones will work in both, but headsets have buzzing nosie on the wrong one.
13:17.13untakenstupidnicis there a way i could type <>{} without a virtual keyboard?
13:17.51KotCzarnyremap some keys
13:17.56KotCzarny~remap
13:18.00KotCzarny~ping
13:18.00infobot1 packet transmitted, 1 packet received, 0.0% packet loss
13:18.05KotCzarny~keyremap
13:18.05infobotit has been said that keyremap is http://wiki.maemo.org/Remapping_keyboard
13:19.16sixwheeledbeastIf you only need them in terminal you also have an option to change just the terminal quickbar.
13:22.03bencohI have a keymap I could share
13:22.09bencohfor non-qwerty devices
13:30.15untakenstupidnici want to write C and i'm puzzled how could i fit <>{}[] on the keyboard
13:30.29KotCzarnydont forget the |
13:30.43KotCzarnyand some other special chars
13:30.43untakenstupidnicyeah
13:30.58untakenstupidnicnever thought trigraphs would be of use
13:31.23untakenstupidnici should check if they themselves could be written
13:32.19KotCzarnyyes
13:32.33KotCzarnyi have mapped | to fn-z i think or something
13:33.18KotCzarnybut you really should just get bt keyboard
13:33.41untakenstupidnicwhat  is it?
13:33.48KotCzarnybluetooth keyboard
13:34.39KotCzarnyit might be possible to connect plain usb keyboard to n900, but it all depends how much power it would draw (so no fancy leds etc)
13:35.36untakenstupidnicbut it wouldn't be quite mobile
13:37.49bencohuntakenstupidnic: http://pastebin.notk.org/pastebin.php?show=f175c3839
13:38.00bencohI don't remember which layer I'm using though
13:38.30bencohI think the "de" one, but I'm not certain
13:38.38bencohyeah, that's the one
13:39.14bencohyou might need to adapt it to match your keyboard overlay
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