Neo900 - finally a successor of N900 - Page 170 - maemo.org

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JohnHughes	2014-01-17 , 06:00
Posts: 89 \| Thanked: 194 times \| Joined on Feb 2010	#1691

Originally Posted by macey

I am not sure what your point is here. Yes, the headphone jack of the Neo900 will be 'compatible' with that of the N900, in the sense that you can plug in a set of 'minijack' headphones (or microphone) and they will work.

Which kind of headphones - OMTP (old Nokia style, incl N900) or AHJ (most Android phones, first Luminas) or both (newer Luminas).

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	macey	2014-01-17 , 06:13
	Posts: 283 \| Thanked: 276 times \| Joined on Aug 2011 @ uk or @Pai,Mae Hong Son, Thailand	#1692

Originally Posted by JohnHughes

Which kind of headphones - OMTP (old Nokia style, incl N900) or AHJ (most Android phones, first Luminas) or both (newer Luminas).

I personally use the Apple (I know, I know) phones with my N900's, they use the 'standard' 3 contact audio 'minijack' that has been used for decades. The 4 contact version of this, I believe, provides remote... That is what I would propose to use if compatible with the other proposed uses of the socket.....

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	joerg_rw	2014-01-17 , 11:39
	Posts: 2,222 \| Thanked: 12,651 times \| Joined on Mar 2010 @ SOL 3	#1693

We will go for OMTP, I seem to have elaborated on why "AHJ" is a really poor idea engineering-wise. Your microphone signal is on a contact that's supposed to be GND/sleeve/shielding-braid
[edit] will try to get "dual standard" support

Last edited by joerg_rw; 2014-03-21 at 16:11.

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	macey	2014-01-17 , 12:48
	Posts: 283 \| Thanked: 276 times \| Joined on Aug 2011 @ uk or @Pai,Mae Hong Son, Thailand	#1694

Originally Posted by joerg_rw

We will go for OMTP, I seem to have elaborated on why "AHJ" is a really poor idea engineering-wise. Your microphone signal is on a contact that's supposed to be GND/sleeve/shielding-braid

Ok, Ok
I'm probably 30 years older than you people, but an ex mainframe sysprog and audio enthusiast and Linux/N900 etc... Please cut me a little slack.. What is wrong with my suggestion? In plain English please. Can remote control of the mediaplayer be implemented with OMTP or not?
--
Four N900's, Neo900 100EUR + donator.

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JohnHughes	2014-01-17 , 13:03
Posts: 89 \| Thanked: 194 times \| Joined on Feb 2010	#1695

Originally Posted by JohnHughes

Do any of the old-style Nokia headsets (OMTP) have media controls?

Answering myself - yes, look at the Nokia AD54 for example.

So the question becomes, would that work with the Neo900?

Does it work with the N900? This thread: http://talk.maemo.org/showthread.php?t=58364

seems to say not. Is that a hardware or a software problem?

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	joerg_rw	2014-01-17 , 13:05
	Posts: 2,222 \| Thanked: 12,651 times \| Joined on Mar 2010 @ SOL 3	#1696

Originally Posted by macey

Ok, Ok
I'm probably 30 years older than you people, but an ex mainframe sysprog and audio enthusiast and Linux/N900 etc... Please cut me a little slack.. What is wrong with my suggestion? In plain English please. Can remote control of the mediaplayer be implemented with OMTP or not?
--
Four N900's, Neo900 100EUR + donator.

Do you refer to those ECI multibutton remotecontrol headsets? Please see http://talk.maemo.org/showthread.php...047#post799047 and http://talk.maemo.org/showthread.php...162#post951162
It's actually a difficult question if and how to support it in Neo900 when nobody took care to make it work in N900 - despite me recently thought I found a nitdroid driver doing it.

Last edited by joerg_rw; 2014-01-17 at 13:17.

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JohnHughes	2014-01-17 , 13:11
Posts: 89 \| Thanked: 194 times \| Joined on Feb 2010	#1697

Originally Posted by macey

Ok, Ok
I'm probably 30 years older than you people.

Only if you were born in 1929.

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	macey	2014-01-17 , 13:18
	Posts: 283 \| Thanked: 276 times \| Joined on Aug 2011 @ uk or @Pai,Mae Hong Son, Thailand	#1698

Originally Posted by joerg_rw

Do you refer to those multibutton remotecontrol headsets? Please see http://talk.maemo.org/showthread.php...047#post799047
It's actually a difficult question if and how to support it in Neo900 when nobody took care to make it work in N900

Yes,I do refer to those type of headsets, now I understand why I never got a sensible answer before. I can't understand why this is so difficult, compared with what else is going on with this project, this should be child's play....
Edit:- ok, this is an idiot's view....
I just took a look @ joerg's thread...

Last edited by macey; 2014-01-17 at 13:40.

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JohnHughes	2014-01-17 , 13:43
Posts: 89 \| Thanked: 194 times \| Joined on Feb 2010	#1699

Here's JUSSI HANNULA's MSc thesis about how he designed stuff to work with ECI peripherals: http://dspace.cc.tut.fi/dpub/bitstre...69/hannula.pdf

Here's some company that makes ECI interfacing hardware: http://www.latticesemi.com/~/media/D...ument_id=45825

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	joerg_rw	2014-01-18 , 05:25
	Posts: 2,222 \| Thanked: 12,651 times \| Joined on Mar 2010 @ SOL 3	#1700

Originally Posted by JohnHughes

Here's JUSSI HANNULA's MSc thesis about how he designed stuff to work with ECI peripherals: http://dspace.cc.tut.fi/dpub/bitstre...69/hannula.pdf

Here's some company that makes ECI interfacing hardware: http://www.latticesemi.com/~/media/D...ument_id=45825

From the thesis (first link), page 20:

Data communications concerning externally connected accessories are being
handled using the ECI-protocol. Theory behind the I2C-protocol is covered in more
detail than the theory concerning the ECI-protocol as the ECI-protocol is currently
determined to be classified by Nokia. In this thesis the ECI-protocol is defined on a
need-to-know basis. Only a brief introduction concerning the communication protocol is
given, but the things affecting the electronics design and the required measurements are
being defined in detail.

Not of much use to read the remaining 80 pages of this thesis. We won't implement this design with a closed-protocol dedicated ECI-controller as of second link above. BTW this controller's driver source been already spotted back when I posted to the multibutton-thread. [edit] Hmm maybe not. ATtiny20, really tiny, really cheap. I'll have another look at it.[/edit]

It seems possible to provide all needed functionality to run ECI on headset receptacle under OMAP SoC control, just like on N900. But again we need somebody implementing a driver for at least N900 or we can't test our prototype HW for correct operation.
The press release linked by 2nd URL above has

Nokia has developed the Enhancement Control Interface (ECI).
ECI initially was a proprietary interface, but Nokia has recently
opened up their ECI to drive adoption in smartphones built by other
companies.

Such an official paper by Nokia specifying ECI would probably help a lot, if somebody could find it. Also when somebody would care to backport that nitdroid driver to fremantle, we have to support ECI in Neo900 ;-)
/j

Last edited by joerg_rw; 2014-01-18 at 06:49.