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Please make a small feedback report if you build a working interface.

Report problems, your head unit type, yampp3 version.

Thank you!

has anybody successfully made everything work fine?
I'm particulary interested in the Multi-cd emu stuff:
is there any serious risk to damage the HU?
has anybody got it working with playn pc instead of a yammp3?
is there any ways to go round the 99 dirs/files per dir limitation?

thanks in advance, lx

I made and I know two men who made it too. ;)
You can damage the HU if you not right connect the ASENBUS. ASENBUS - 20mA maximum.
What kind of work with PC you mean? May be I can help?
HU can display on screen 99 discs and 99 tracks maximum! Possible to make switch between first 99 discs and second 99 discs, maximum 12 pages.

hi

i tried to port the whole thing to a PIC18F452 but i didn't have any sucess so far
my problem is that i don't know anything about ATMEGA and AVRGCC so it's a hard piece of work to figure out what the orignal code is doing
but i will not give up until i got it working :)

cya
mike

Do you want a step by step instructions for compile the code and upload it to ATMEGA?

hi vitat

thx for the offer but i just want to understand what your code does :)

in the ipbus.c file there is a part which explains the timer values you use
based on a 7.3728 MHz clock but in your circuit diagram there is a 14.7456Mhz resonator
does the AVR divide the external frequency with 2 (i couldn't find anything in it's datasheet)?

another question:

in link.c you write
....
timer0_source(CK64);              //update every 1us
timer0_start();
while (INPUT_IS_SET)
{
T = inp(TCNT0);
if (T >= 50) goto err_exit;       // 200us max wait time
}
...

you assign a prescaler of 64 to timer0 which should increment it every 1us
so why is a timervalue of 50 equal to a 200us delay ?!?!

there is also a question that appeared when i watched the communication on the ipbus with a scope

after the first 27 bytes comes the first of 6 "spikes"
those spikes have the same hightime (about 26us)as a 0 in the normal comunication but in the first 20us the voltage level ist about 2 times higher than in the rest of the communication
did you find out what this spike is or does ?
does your code and hardware threat that spikes as normal bits  ?

thx4 your help
mike

No problem. ;)
:Tomato: My code is NOT very clean. I began making emulator on AT90S8515 - older ATMEL microcontroller. And it working at 7.3728 MHz maximum. This calculating for 7.3728 MHz. When I become use ATMega I am not correcting this little help.
:oops: This comment I am not cleaning too. At 7.3728 MHz prescaler was = 8 (CK8) and timer updated every 1us. At 14.7456 MHz I use prescaler = 64 (CK64) and timer updating every 4us (14.7456 MHz / 64 ~ 23KHz ~ 4us).
I am not sure what you mean. But I am sure that standart IP-Bus driver seeing voltage difference > 100mV as high level. And unimportant that difference = 100mV or 200mV.

that clears up a few things thx  :idea:

i'll post some screenshots of those "spikes" as soon as i have a scope available
i guess a picture could help to explain what i mean

cya and thx
mike

8)  
You can attach pictures to post now. I install this option into my forum. :D

hi vitat

i've built a working logger with a PIC18F452 that captures the communication between my HU(KEH-P6600R)  and the CDC(CDX-P24S) but logging is the only thing that seems to work
when i try to emulate the CDC nothing works

are BUS+ and BUS- the only wires that need to be connected to the emulator or is there anything else that needs to be done to get the bus going ?

your code is rather complex so i can't figure out the first steps after powerup that init the bus
what are the nessecary pieces of code to init the communication between the emulator and the HU ?

sorry for so many questions but it seems as if you where the only avaliable specialist for the IPBUS  ;)

thx
mike

mike,
Congratulations! =D>
Yes!
Code begining work from function[code:1]int main(void)[/code:1]
I think, your error in send(read)_acknowledge function.

After transmiting byte, going "ucknowledge bit". Transmitter unit set line in high stage, only after that - receiver set line in high stage too! Transmitter send bit 20us/20us, receiver send bit 35us/5us and if look at scope - you see only 35us/5us bit. ;)

hmm.. i guess your right it must be some timing problem i'll check that tomorrow for now i got to get some sleep :)

thx & cya
mike

May be it can help you ;)

hi

i finaly built a working emulator with a pic
your last post with the timing diagram realy helped vitali

i have one last question
if i want to connect more then one CDC or emulator to the HU i just need to give every device a different ID right ?
if yes, do you have other valid ID's or logfiles of a communication with more devices on the ipbus ?


thx alot
mike

mike,
No. You must have an adapter with microcontroller to connect more than one device.
I'll be working on it...

Hi!

Iґve built your adapter.
Programming the ATmega8 with yaap works.
Now my Question: Is there any way to test it before i connect it to my HU?
Iґve built it with the MAX202. Is it possible to see something on my terminal (PC) to know that at least the ATmega8 and the MAX202 are working?

Is it enough if I uncomment the following in constants.h ? If yes, what should i see?
[code:1]
#define LOG

#define ASENBUS_ENABLE
[/code:1]

Regrads,
Sebastian

hi

if u enabled LOG then you shouldt see the message "Start" followed by a carriage return and a line feed in hyperterminal right after powerup
You should't also see a "ON"or "OFF" when ASENBUS is switched on or offf

there will not be any other message in hyperterminal until a real communication between your HU and the emulator has been established

regards
mike

hi!

just enabled LOG.
There is at first a "Start", if powered on. But at next there always comes "CD-Error". I think this is ok, because there is no HU connected.

Thanks to mike,

regrads,
Sebastian

hi

atmega seems to work then
you are right this error only comes if an acknowledge error occurs during a send from the emulator to the HU  (or the HU is missing  :D)

regards
mike

If you define ASENBUS_ENABLE - don't forget that ASEN_BUS can not connecting to the MEGA directly!
ASEN_BUS from HU have 12V level! You must using transistor! Looking to my old version of schematic of IP-Bus emu with ASENBUS transistor.
http://www.vitat.spb.ru/files/ip-bus/ip-bus_sch.gif

hi,

now iґjust connected my HU to the Emulator, but there also are only a "START" after power-on, and lots of "CD Error".

Could you please help me with this problem??

thanks,
Sebastian

sebastian,
Common to ICQ. ;)

hi,
the emulator runs fine since one month ago in my car together with an selfmade MP3 player.
best regards

kamil,
Thanks for feedback!
Photos? 8)

hi,

(http://pics.m-eit.de/test5.JPG)

left breadboardpcd is the emulator.
currently Iґm using a Mega16, because mega8 is currently not availible for me.
i will try to import the emulatorsoftware in the player controller (mega128),
but currently i have some problems to understand the emulatorsoftware, because i just learning program atmel ( and  C ).
best regards

kamil, Very nice!
This photo in your car? ;) How about any box?

After many problems my emulator now working. In next week I put some photos of my project it's MP3 player mounted in Pioneer KEH-P7800R head unit.

Congratulations!

This is my "Minimum hardware MP3 Player".
ATMega162 (CPU :) )
VS1001k (mp3 decoder)
LM2575 (voltage regulator)
Photos:

I can't attach photos :(

rlemon's photos:

It's ugly but working :)

Now, if dimension of an Image is bigger then 800x600, the Image will be displayed as a Link, rather than displaying it inlined.

I busy building the emulator to use with my Yampp3/usb.
My question is were the software changes  to the Yampp3/usb
extensive? or just serial out modifactions ? and are they listed.
I am busy converting my Yampp3/usb to use a color nokia screen with
software from MIS.
This allows usb upload of MP3's! and i would like to keep.

Many Thanks
Jman

PS
I have been looking for something like this for ages WELL DONE. :)

Just a silly question:

All the IP-BUS times are in MICROSECONDS, not in MILISECONDS. Is that is correct?
I saw some information about some timming in MILISECONDS, but I believe the firmware of IP-BUS emulator is in MICROSECONDS.

Thanx!

kamus

kamus, microseconds!

hi,
here is my smaller version.  :)
but itґs not the last version.
the next step is to connect an USB2.0 chip for simply download files.
the second step will be an industrial PCB  :)
(http://pics.m-eit.de/HDDMP3/HDDMP3.1.JPG)

rlemon: how does the HU handle having all the cd player components removed? Does it give any error codes or other problems ?

I am testing my emulator on a pioneer HU with broken CD section. I might build a player into it as you have.

Hi
My Pioneer KEH-P7800R it's tape player, and after remove cassette mechanism doesn't give any errors.

@rlemon

Did you connect a notebook hd to your device or I have a bad sight? I want to built a such device, is it "opensource" ?

[Edit]
Sorry I'm OT

Mike

Did you ever get the Disk Changer Emulator working with the PIC properly to emulate a CD chnager
on the IP bus ??

If you did, have you released this PIC circuit and code on the Forum ??

If you haven't is it possible to get this mailed to me, PLease !!

I recently bought a KEH P-2035 Pioneer Deck and an external IP-Bus cable CDR B-10, but unfortunately, according to the Pioneer Australia this deck doesn't support AUX input via the CDR B-10 cable, so I believe that the only way that I can make this work is to "fool" the Head Unit into thinking it has a CD chnanger connected so that the RCA Line In is enabled. Or so is my theory, anyway !!!

Any help would be appreciated !!!