Title: More JVC J-link Post by: Dave on 24.02.2006 10:25:53 Well I haven't made any big breakthroughs yet as I haven't spent much time on it (I'm still learning how to use my logic analyzer to its full potential). I do have some information though, for anyone who wants it:
The bus has two lines, but you need three wires to implement. "CONT", the Yellow wire in the cable, is on the same circuit as the "REM" wire from the head unit and thus gets power whenever the HU is on. I'm doing my analyses on a CH-X1500RF, so I'm not actually using a HU. On my system, the "CONT" line is powered when the unit is turned on (not when battery voltage is applied) and goes to around 8 volts. It can probably take more as someone else reported measuring 12V on that wire. Regardless, this wire needs power whenever you intend to have communication with the slave. The two bus lines are SCK (Grey wire) and SI/SO (Green wire). I'll refer to them as Clock and Data, respectively. They should be TTL Low=0V and High=5V. This means you could easily implement the bus with a microcontroller (I plan to use a PIC). The clock period is about 26us. I have measured it at 25.6us. Data should be stable for a rising clock edge. At the start of a transmission, both data and clock go high, data first and clock immediately following. They stay high 510-520us. Then the clock cycles for eight bits. At the end of the byte, data stays at its last state (if the last bit was a 0, data stays low, if it was a 1, data stays high) and clock stays high for 320us before pulsing the next byte. After the last byte the clock stays high for 320us and then goes low. A packet can end with a 1 and so far I have seen packets of 1 byte (acknowledge? it was FF) and packets of 7 bytes, and packets of which I have not seen the end (sampling period ended). I plan to refine my triggering to get whole packets. I also believe I have witnessed a slave request. After the 320us end of packet, both clock and data are always low. I suspect at this point the slave can interrupt by pulling the data line high. The master then brings the clock high. Seeing this, the slave releases the dataline and it goes low. The clock stays high for a total of 520us at which point the packet starts. All packets longer than one byte have either started 1001 0011 or 0001 0010. I have yet to determine the endianness of the bytes. I have also yet to determine who is supplying the data after the slave has supposedly signaled for communication. More to come in the next few days. Title: Re: More JVC J-link Post by: Michael on 24.02.2006 13:57:52 Thanks for sharing your information. =D>
Title: Re: More JVC J-link Post by: sophana on 24.02.2006 17:13:23 Hi, looks great.
looks like synchronous bidirectionnal data. (like unilink) Could you post waveforms? So you will make a logger? Title: Re: More JVC J-link Post by: Dave on 24.02.2006 19:03:43 My logic analyzer is old, but it does have RS-232-C output capability. I will make an effort to sent the data to my PC, but I'll have to find a program than can convert the data to a usable image (the port on the analyzer was meant to be used with a serial printer, so if anyone knows how to get serial printer data into an image, I'm all ears). I also need to improve my sampling so that the timing diagrams produced are of use to others. Worst case scenario, I will draw timing diagrams to post for clarification of bus operations.
My intentions are to emulate a bus master to control the CD changer with a PIC, but doing so will require reverse engineering of the protocol so that those of you who wish to emulate slaves will be able to do so as well. Dave Title: Re: More JVC J-link Post by: pjwl on 24.02.2006 22:22:41 Hey Dave,
Very nice, i did a seem project for the Kenwood, but i would be pleased if you give more information on the JVC protocol, i need to control an external MP3 player and if you need help, email me at patrickloef@hotmail.com Go so ON!!! Regards PJWl Title: Re: More JVC J-link Post by: Dave on 24.02.2006 22:39:34 I will post more information as I acquire it. I am still having difficulty getting my logic analyzer to trigger properly in order to capture usable information. I fear it may lack the resources (RAM) to do what I want it to. Its an HP 1650A if you think you can provide any information.
Title: Re: More JVC J-link Post by: sophana on 27.02.2006 11:03:26 now that you have low level communication specification through the logic analyzer, you can just program your pic as a passive data logger and send all informations through the serial line to the pc. Then you can post logs here, and analyze the protocol itself.
If you want a software uart for the pic without need for max232, just go and get it from my code. the problem with this solution is that you cannot listen to the bus while sending to the serial. So you should use a 16f627. You can use its usart for listening the bus (synchronous serial) or sending serial to the pc. just make sure that all data is logged, and if there is no other info available on the bus. Title: Re: More JVC J-link Post by: Dave on 28.02.2006 01:07:06 I agree this would be the best way to handle things, but my PIC programming skills are still in their infancy. I have an 18F458 and a MAX233 at my disposal. Can you point me to the piece of your code to which you are referring? I imagine I will first have to understand what your code does before I can modify it for my PIC, clock speed, and bus timing.
Dave Title: Re: More JVC J-link Post by: Dave on 06.03.2006 20:11:28 Just to give a bit of an update, I have written a program for the PIC to do my bus datalogging. All I'm waiting for now is an oscillator so I can run it. I'll post more once I start logging. What's nice is that though it is limited, I can use some of the bytes I sniffed with the logic analyzer to verify the proper operation of the PIC sniffer before I start trying to decifer the protocol.
On a seperate, but related note, does anyone know what the deal with the bus connectors is? I have not heard anything from Intravention in reply to my inquiries. Thanks! Dave Title: Re: More JVC J-link Post by: rogier166 on 06.04.2006 01:09:26 "Dave:On a seperate, but related note, does anyone know what the deal with the bus connectors is? I have not heard anything from Intravention in reply to my inquiries. Thanks!"
They don't respond on my emails either. Are there any other sources for this connector? Title: Re: More JVC J-link Post by: Dave on 07.04.2006 01:01:48 I actually got a private message from them today. E-mail Simon at simon (at) intravention (dot) co (dot) uk to arrange for a purchase.
Dave Title: Re: More JVC J-link Post by: Falstaff on 11.08.2007 07:06:43 I'm sorry to bring this post back from the grave, but does anyone have any more information on the j-link protocol? I'd certainly like to figure it out to talk to my new HU.
Title: Re: More JVC J-link Post by: MathNiss on 14.10.2007 21:19:54 Hello Guys
Could it be that JVC uses the I2C protocoll? BTW how hard would it be use a JVC headunit to control something that's intended for remote control (IR) only? I'm thinking digital terrestrial tv (dvb-t in Europe) or the targetxtream. Greetings Mathy PS my headunit supports GiGa-MP3 DVD's. A single DualLayer DVD or (if my HU doesn't support that) two dinlge layer DVDs can hold as many MP3's as 12 MP3 CD's. It's a pitty JVC doesn't offer an in-car (MP3) DVD changer or just an HDD based "changer" that can handle video too. Hmm, now that would be a nice project: buy a second hand CH-X1500, throw out the CD changer mech, install a DVD changer or HDD, ty in some hardware to decode the video stuff. Now all I need is somebody who can tell me how to do it. :wink: Title: Re: More JVC J-link Post by: ich587 on 25.10.2007 09:59:42 Bringing a HDD to the J-Link CD-Changer Port is exaxtly what I want to do....The HDD MP3 Player is already built though its not ready yet, but it works. At the moment my self-built Player can handle 2 IDE Harddisks with up to 120GB of data each. At the Moment I have one in my car connected with a Modulator... But the Sound quality trough FM isn't that good ( O:) exactly spoken very poor). So the perfect solution could be connecting it to the J-Link...
I have some photos of the player on my page ( http://michael-gerber.net/joomla/index.php?option=com_ponygallery&Itemid=46&func=viewcategory&catid=12 (http://michael-gerber.net/joomla/index.php?option=com_ponygallery&Itemid=46&func=viewcategory&catid=12) ), there is also a descrition, not very well updated an in german... O:) So if Someone can post a detailed description of the J-Link protocol this would be very useful.... Title: Re: More JVC J-link Post by: MathNiss on 25.10.2007 20:29:42 Hello Michael
Sound interesting, but what I'ld like to see is an HDD based system that uses the J-Link to control it and to receive the sound signal(s). It should also be able to play movies via an RCA/Cinch/FBAS connector which directly connects to a small monitor. I want to be able to select the movies (and maybe the MP3's, but music isn't my main concern.) via the head-unit. The monitor doesn't need to show a menu. Greetings Mathy Title: Re: More JVC J-link Post by: ich587 on 26.10.2007 11:16:56 Sorry but IMHO the AVR (ATMega128) isn't strong enough to play videos... MP3 files up to 320kbit/s is no problem but vidoes are over 1500kbit/s, thats factor 5...
Perhaps with the use of an ARM that would be possible, but I have no experience in programming ARMs... But the MAIN Problem is that I first need a CH X1500 for analyzing the Interface and its commands... And the next task is to implement it on my MP3 Player and then let's talk about video.... Greets Michael Title: Re: More JVC J-link Post by: MathNiss on 26.10.2007 22:44:43 Hello Michael
I can be patient ... sometimes. Greetings Mathy Title: Re: More JVC J-link Post by: MathNiss on 05.11.2007 00:21:46 Hello Michael
I've found what looks like an ad on a Dutch site, for a JVC radio plus CH-X550. Fixed price is 35 Euro's. I'm not 100% sure that the price includes both, but the CD-changer lacks the CD-holder and J-Link cable, so it probably does. The CH-X550 is a sister model of the CH-X1500, but lacks the ability to decode MP3's and doesn't support CD-Text. And it's blue instead of green. :-) Would that be of any help? One advantage would be that you could use this radio in your tests instead of your own radio. Greetings Mathy Title: Re: More JVC J-link Post by: ich587 on 05.11.2007 17:50:33 Hi Mathy,
Can you post a link? Title: Re: More JVC J-link Post by: MathNiss on 05.11.2007 19:57:36 Hello Michael
Here (http://www.marktplaats.nl/index.php?url=http%3A//auto-diversen.marktplaats.nl/accessoires-radio-s-cd-en-dvd-spelers/126120058-jvc-radio-cass-met-wisselaar-echter-zonder-kabel-en-magazijn.html) it is. Greetings Mathy Title: Re: More JVC J-link Post by: ich587 on 06.11.2007 14:37:29 Thanks Mathy...
But shipping it to germany is "not possible", he said.... :cry: Title: Re: More JVC J-link Post by: MathNiss on 06.11.2007 18:59:36 Hello Michael
I live in the Netherlands, close to the German border. :-) (18 km from Aachen) Greetings Mathy Title: Re: More JVC J-link Post by: MathNiss on 06.11.2007 23:11:38 Hello Michael
I just noticed that the ad no longer exists. :( Greetings Mathy Title: Re: More JVC J-link Post by: MathNiss on 06.11.2007 23:19:50 Hello Michael
Guess what? I started searching for another ad for a JVC CD-changer and found the ad. But with a new URL. So the stuff isn't sold yet. Hmm, the "new" ad has today's date. Guess that means the ad will change it's URL and date again in a couple of days. Greetings Mathy Title: Re: More JVC J-link Post by: ich587 on 07.11.2007 12:55:27 At the moment I'm trying to get one on ebay (CH-X500)....It ends today at 20:08
Title: Re: More JVC J-link Post by: MathNiss on 07.11.2007 20:17:50 Hello Michael
That was 8 minutes ago. Did you get it? :D Greetings Mathy Title: Re: More JVC J-link Post by: ich587 on 07.11.2007 20:19:59 Hello Mathy
I did not get it. It is sold for 45,50€ to someone else.... Title: Re: More JVC J-link Post by: MathNiss on 07.11.2007 20:24:07 Hello Michael
Want me to contact the guy who's selling the radio and changer I mentioned above? Or do you want to contact him and use my address? Greetings Mathy Title: Re: More JVC J-link Post by: ich587 on 07.11.2007 20:35:45 Hi Mathy
would be great if you can contact him, and if it works send it to me with german post..... We only have to think about the payment Greets Micahel Title: Re: More JVC J-link Post by: MathNiss on 07.11.2007 20:51:41 Hello Michael
I've sent you a private message, but I'm not sure if you'll get a notice via email. BTW I'll be offline from around 21:00 o'clock untill shortly before 23:00 o'clock. Greetings Mathy Title: Re: More JVC J-link Post by: ich587 on 03.12.2007 19:53:13 Last week I got the CD-Changer and Radio (a CD-X500 and a KS-FX483) from Mathy, but I didn't have much time, and some problem with my Power supply...
It's only 3A at 12V, with Radio connected the 12V were actually 11,2 and with changer connected the voltage fell under 10V.... So the only Result i got is the Pinout of the Connector (some descriptions are printed on the pcb of the changer) and the colors in cable: 1 2 3 - - - 7-> | | <- 8 - - - 4 5 6 (Pinout when you look into the connector of the changer) 1 red R channel \ 2 black Analog Ground | Audio 3 white L channel / 4 yellow PSW (could stand for swichted Power) \ 5 grey SCK | "Data" 6 green SI/SO / 7 black Ground \ 8 brown +14V (continous Power) / Power So much for this week, next weekend I will try getting the changer to work with an old AT Power supply (with 9A at 12V).... Title: Re: More JVC J-link Post by: MathNiss on 03.12.2007 20:16:22 Hello guys and girls
Ich587 didn't get it from me, but via me. 8) PSW probably stands for PowerSWitch. All radio's have a pin on one of the ISO plugs that tells the power antenna to appear. This pin is also used to tell amplifiers and probably CD-Changers that the radio/head unit is switched on. Greetings Mathy Title: Re: More JVC J-link Post by: ich587 on 09.12.2007 15:24:52 Another weekend, another story....
Due to the voltage drop mentioned last week, I tried with another Power supply... (http://michael-gerber.net/joomla/components/com_ponygallery/img_pictures/dsc00495_1_20071209_1842549883.jpg) But the changer still didn't work, but this time it had stable 12 volts. Since I first connected the Radio, I wondered why diplay lighting didn't work...Finally I took a closer look at the main PCB of the Radio (http://michael-gerber.net/joomla/components/com_ponygallery/img_pictures/dsc00498_2_20071209_1728470487.jpg) Now I know why the Unit was that cheap. Tuner and Cass-deck work, but the J-Link is "up in smoke"... But Finally I got some timings with the unit from my car.. (http://michael-gerber.net/joomla/components/com_ponygallery/img_pictures/dsc00500_1_20071209_1040298709.jpg) Please don't post comments about the quality of this Image... It's an old Kontron PLA2 analyzer and there is no "Export to Image" function... This is what you should see o the Pic: 1 ---- --------------- ---------------- Data | | | | | | 0 ---- --------------- -------------- ---------------------------------------------------------------------------------------- 1 -------- -------- -------- -------- -------- -------- -------- -------- ------------------------------------- Clock | | | | | | | | | | | | | | | | 0 ------- ------- ------- ------- ------- ------- ------- ------- 1 2 3 4 5 6 7 8 As you can see, every "Packet" consists of 8 bits and some kind of Start sequence on Data line, when no Data is transmitted the Clock line is at High State (5V) and Data at Low The Clock Period is 16盜 (62,5kHz) and the distance between the Packets is about 1ms... The byte above (0x50) is the first byte that is transmitted when the unit is turned on. My next step is to build some decoder that listens to the Packets on the bus.. Here is the link to the photos in high resolution http://michael-gerber.net/joomla/index.php?option=com_ponygallery&Itemid=46&func=viewcategory&catid=13 (http://michael-gerber.net/joomla/index.php?option=com_ponygallery&Itemid=46&func=viewcategory&catid=13) ...to be continued (maybe next week)... Title: Re: More JVC J-link Post by: DaveR on 12.12.2007 13:18:26 Hi ich587
Nice to see this JVC J-link getting started again! (incidentally, I am NOT the same Dave that started the thread). I have a KS-RT710R head unit and a dead KD-MK77 CD changer, possibly due to water damage as the car has developed a leak. Don't know how similar my CD changer is to yours but I managed to find a PDF of the schematics but in Russian .... sadly I have not time to investigate the workings of the changer and head unit (young family, lack of suitable test equipment). Possibly the largest problem to solve is getting the actual CPU of the CD changer to talk to the head unit - my changer has only minor water damage but will not power up. Have you tried soldering a wire across the blown track?. Also there could be a couple of dry joints on the large solder regions - looks like a couple of wire jumpers - but could just be an artifact of the photograph. Please keep up the progress reports, Regards, Dave Title: Re: More JVC J-link Post by: ich587 on 13.12.2007 11:12:56 I tied soldering some wires... but it didn't work. I think there is some more problem... perhaps even the 湣 is damaged.
I won't spend much time on repairing this old cass-radio. This week I made a layout for a PCB with an AtMega8 and a FTDI, so I will be able to monitor the traffic on J-Link with Laptop in the Car. But first of all I have to find some time to make the PCB and build it...Pehaps I can do it this weekend, if not then somewhen between Christmas and 2008.... If I have some new results, I will post them here (and on my own page if I find some Time) Title: Re: More JVC J-link Post by: MathNiss on 13.12.2007 12:06:19 Hi ich587
I hope atleast the changer works (via J-Link). And can be fooled to believe that a cartridge (CD-holder) is present. Greetings Mathy Title: Re: More JVC J-link Post by: ich587 on 17.12.2007 16:43:55 The Changer works...(see Analyzer pic)
This weekend I've made the PCB with AtMega8 and FTDI, so that I will be able to Monitor the Traffic on J-Link bus. I am at home from net week till 6th January, so I should have time to Programm the AVR amd post some traffic-logs here.... Title: Re: More JVC J-link Post by: MathNiss on 17.12.2007 21:04:42 Hello ich587
I can hardly wait. Greetings Mathy Title: Re: More JVC J-link Post by: DaveR on 18.12.2007 10:41:28 Hi ich587
I can hardly wait as well!. Best Regards, Dave Title: Re: More JVC J-link Post by: ich587 on 04.01.2008 12:59:48 A lot of time has gone since I last posted results here....But now my "J-Spy" hardware is built and some kind of software is on it, so that I am now able to post some of the traffic that I've "seen"...
After turning on the Power (not switching on the Radio, only supplying power to it): BF 00 B0 00 20 00 80 02 0B 60 F0 A9 08 10 0F C2 00 00 82 D0 0D B4 00 After turning on the Radio (no CD-Changer selected): 78 04 80 1C FE 04 00 16 01 80 8B 14 00 10 64 6A 14 00 20 30 30 A2 C2 79 08 C4 C1 1C 40 C0 7D 02 D0 04 0D 23 01 Now selecting the Changer (CD1 Track1): 78 BE A2 04 3E 0B 3C E0 31 82 BD 23 14 00 00 00 50 B8 9E 5F 80 F6 B5 0E 21 A1 43 80 42 7B B7 40 F3 36 1C 10 91 83 00 C2 DF DC 60 00 00 00 A0 64 6B 1C 08 D1 20 30 C2 DF 9C 40 40 7C 02 A0 82 6F 69 03 08 3E 7A C4 10 00 7D 02 50 E0 7A 53 3F 95 FF C4 07 50 06 39 35 01 40 83 36 34 01 41 3F FF A9 48 C0 E2 54 15 1F 4A 7F F2 30 00 42 6B 0D 38 BE CA DF 30 10 C0 Some Updates (groups of 5 bytes run over the line each second): 89 7D D2 90 D0 C5 BE 24 50 A189 FE E1 90 E8 52 7B 5A 62 BE D8 98 85 81 BF E8 FB 24 28 E0 52 FE D5 D0 A0 4B FE D2 D0 C1 C5 FE A9 D0 80 4B FE 52 10 A0 All values are HEX values of the bytes transmitted, now I only have to find out which unit transmitts which byte.... Title: Re: More JVC J-link Post by: ich587 on 04.01.2008 15:38:08 OK forget all of the last post....Further analysis has shown that this isn't correct, because there are two types of messages on the J-Link bus....more to come
Title: Re: More JVC J-link Post by: bigjohn16678 on 19.03.2008 09:22:49 I removed my MK77 (didn't work right anyway, think my subs killed it) so I could try to use the audio on the cable for an audio input source to my JVC gs919. I want to use the audio for a hard drive based system with an audio output, the FM modulator suks at best. Can anyone tell me how to fool the head unit into beleiving the changer is still there? The head unit will not switch to cd changer with just the audio connected to the cable. My cable has 8 pins 1 sa/so, 2 sck, 3 cont b+, 4 af l, 5 af gnd, 6 af r, 7 bus out, 8 gnd. I may not know as much as you but I know enough to be dangerous.
Title: Re: More JVC J-link Post by: DaveR on 20.03.2008 18:40:31 Hi Big John
What does the connector for the J-link look like on the head unit?. Mine has an 8 pin mini DIN which I think is the older Jlink, newer has 2 unilink style plugs. The are unilink style Aux in dongles on Ebay but I have no experience of them (3.5mm stereo plugs or there are phono plug/socket versions). With the older JLink, the head unit has to see a working CD unit otherwise it won't be selectable. In this case I guess you need to break out the audio wires from the inter-linking cable - the head unit should not know or care what is the source of the audio signals. Obvious stuff - don't tap into any power cables and don't short anything out ..... proceed at your own risk! Please post back how you get on! Dave Title: Re: More JVC J-link Post by: bigjohn16678 on 20.03.2008 20:02:17 Thanks for the reply DaveR. I have the smaller 8 pin mini din on the head unit (much like a "S" cable). Right now, I've stripped the board out of the changer, cut the jumpers onboard for the af r,l and gnd and soldered a cut off patch cord to the jack side. I still keep the board plugged in but it's in a padded envelope under the seat. The display on the head unit reads "reset ?" but the audio is loud and clear. I can unplug the power to the board but I cannot switch the head unit or turn off the car. Then I can't change back to changer. So, how do I rid myself of the sloppy hidden board under the seat? :-k
Title: Re: More JVC J-link Post by: DaveR on 25.03.2008 19:07:33 Well, you've got further than I have!. The answer to your last question first, is that hopefully ich587 is (or was) working on something that would talk to the head unit to make it think there is a CD changer attached. I can't quite work out what combination of power on/off is causing you a problem. Stupid question - you've got good live and earth on the 4 pin connector?. Sounds like its only live with the ignition on - think I always had mine connected (but with a fuse!) to the battery. The Jlink cable contains a signal that indicates when the head has been switched on which then wakes up the changer. My Russian circuit scan shows an option for the Jlink to power the changer but the wires in the cable look a bit thin to me.
HTH - Dave Title: Re: More JVC J-link Post by: pollomito on 26.05.2008 20:12:36 OK forget all of the last post....Further analysis has shown that this isn't correct, because there are two types of messages on the J-Link bus....more to come Hi, there are some news? I'm really interested on this project. I just want tell to the HU that "I'm a CD changer". I will make a analyzer to but if there are some additional info about the j-link protocol they will be very useful. Thx Title: Re: More JVC J-link Post by: MathNiss on 14.12.2008 13:27:09 Hello guys
Did JVC ever change the CD-Changer protocol? In other words, can I connect any JVC changer to any JVC head unit that has a J-Link connector? greetings Mathy Title: Re: More JVC J-link Post by: myscha on 18.12.2008 22:22:43 @ Mathy
I don't know whether JVC ever changed the protocol, but somewhere inside the changer manual you can read with which HU this changer will work. Title: Re: More JVC J-link Post by: MathNiss on 18.12.2008 22:34:21 Hello myscha
Thanks you for your answer. But I don't even have a changer. I could connect a changer to my KD-NX901, but 12 CD's equals 2 DVD's. Which the KD-NX901 will take too. (Well, not at the same time ofcourse.) Now if JVC made a DVD changer ... Or better yet, a device that holds an SSD. (SSD is like a huge SD-Card) greetings Mathy Title: Re: More JVC J-link Post by: benthamj on 17.01.2009 05:59:50 Sorry to jump into your highly technical discussions, but on following the threads i think you may be able to help me. I have a KD-MK66 cd changer j link to 8 pin din (FM Modulator end) the wires have been pulled from the 8 pin ( I love my grandkids really ) and i have been trying for weeks to find the connections can anyone assist?
Many Thanks Jim Title: Re: More JVC J-link Post by: benthamj on 17.01.2009 06:07:42 If it helps the cable is a jvc No vmp 3267-001 ( seems to be obsolete )
Modulator is KS.RF 100 Jim Title: Re: More JVC J-link Post by: myscha on 11.02.2009 19:40:03 @ benthamj
Did you open the FM modulator? I couldn't find anything about it so I think there are not many possibilities to find out the pinning. You can only hope that it's printed onto the PCB, I think. Title: Re: More JVC J-link Post by: myscha on 28.02.2009 16:39:17 Is somebody (still) interested in information about the protocol and/or in emulating a cd-changer and could provide some assistance?
Title: Re: More JVC J-link Post by: DaveR on 04.03.2009 14:16:14 Possibly, just depends what's involved - I have almost zero free time at the moment!
Title: Re: More JVC J-link Post by: myscha on 08.03.2009 22:10:30 OK - here's what already has been done:
- traces of the traffic have been captured with a logic analyzer - a programme for an ATMEGA32 has been written which receives the traffic, detects the direction, translates it into ASCII and sends it via RS232 - another programme has been written which contains some functions for the communication with the HU All this has been done with a KD-SH909R and a CH-X400 respectively a CH-X1500. Up to now a changer is needed for initialization, but after that the AVR can send commands to the HU. The next steps would be: - create/improve the API. Up to now there are mainly low level functions which are only partly usable in a later application - transfer the initialization to the AVR (the changer replacement) so that no changer at all is required any more You can find the logs as text-files attached to this post. The frames mostly begin with 0x93 or 0x5F, depending on the direction. CH: at the beginning of the line means that the frame was sent by the changer and HU: at the beginning means that it was sent by the HU. The data-bytes are hex-format converted to ASCII characters (simply put 0x in front of each group of two characters). So if you (or anybody else reading this) can provide assistance please let me know. Title: Re: More JVC J-link Post by: sasa on 17.03.2009 21:29:15 hello myscha. i am interesting this project as end-user. i want to replace my ch-x1500 with something like iphone, ipod...
Title: Re: More JVC J-link Post by: myscha on 28.03.2009 22:27:07 At the moment I have no time to continue this project. Therefore I asked for support. I hope I can continue, but I don't know when this will be...
Title: Re: More JVC J-link Post by: MathNiss on 11.05.2009 23:42:00 Hello Myscha
Sure I'm interested. I still want atleast an MP3 playing harddisk that can be controle via my HU, but I'ld love to be able to play movies from a harddisk controled via my HU. (HU selects movie and plays the sound, video data is directly send to a monitor. Unfortunately, I'm better in "idea's" then in "realisation") If you tell us where you need help, maybe we can tell you if we are able to help. greetings Mathy Title: Re: More JVC J-link Post by: myscha on 10.06.2009 23:52:18 Hello Mathy,
sorry for the delay! I read your PM, but I'll answer only here - in English - so that everybody interested in this topic can read it (and perhaps help us)... Unfortunately I have one little time for this project at the moment. I think you'll be glad to hear that it is still of interest for me - but as I wrote: I have almost no time. I think the next step would be to manage the initialization of the system by the AVR. Then the changer would not be necessary any more. I suppose that this will become quite interesting, but it should be feasible with some time and some patience. After that the API will have to be improved so that one can work with it, but this should be no big problem. So if anybody is interested in this topic and has, perhaps, some experience with AVR's or PIC's and some spare time: don't hesitate to call "here"... Does one/Do more of the above points apply to you? Best regards, Michael PS: what about the guys that downloaded the above package: -did you try it? -did you improve it? Title: Re: More JVC J-link Post by: MathNiss on 11.06.2009 00:00:39 Hello Michael
Sorry, none of the above points apply to me. Other then being interested. But if you need someone to test something ... I know which side of a soldering iron to hold, even have soldering station, but never soldered any SMD stuff (yet). And I desperately need a reason to buy a hard disk drive. :P greetings Mathy Title: Re: More JVC J-link Post by: markolonius on 16.06.2009 21:27:17 Hi,
Any work still being done on this? I'm kinda just interested in if its possible to send a signal to allow any aux input to play (don't care much about control from the head unit. just want to be able to switch to cd-chr on my jvc jd-sx840 and use my ipod like a line in/aux) Bought a connex2car wire for the jvc. http://www.adcmobile.com/appguides/PERCAT7v2_31-61.pdf but then found out you need to be able to change from cd-chr to ext-line-in on the HU which can't be done on my unit. I dont know anything about signals though :| Thanks! Title: Re: More JVC J-link Post by: myscha on 16.06.2009 21:43:33 Any work still being done on this? As I wrote two posts before this project hasn't died for me, but I have not enough time respectively more important projects at the moment...Title: Re: More JVC J-link Post by: MathNiss on 16.06.2009 22:27:12 Hello Markolonius
No, that's not possible. You have to either set the HU to Line In/Aux or emulate a CD-Changer. Since your HU can not be set to Line In/Aux, that leaves only two options: a) Wait for somebody to finish this project or b) get a different HU that can be set to Lin In/Aux. JVC does have an Ipod interface. Maybe you can find out if that will work (before you buy it). greetings Mathy Title: Re: More JVC J-link Post by: markolonius on 16.06.2009 22:57:10 Wait, you can't emulate the cd-changer to play like track 1 and have it forever play that track n the ipod signal will just play through it?
Title: Re: More JVC J-link Post by: MathNiss on 16.06.2009 23:00:02 Hello Markolonius
Please reread my previous message. In particular the second sentence. greetings Mathy |