audi FIS 3-line protocol

UPDATE:

check libraries for reading data from radio and writing to cluster:

https://github.com/tomaskovacik/VAGFISReader
https://github.com/tomaskovacik/VAGFISWriter

Here is  wikipage with schematics:

https://github.com/tomaskovacik/VAGFISReader/wiki/How-to-connect

also page ti theory of operation:

https://github.com/tomaskovacik/VAGFISReader/wiki/Theory-of-operation

When writing to the cluster, no external components are required,the  cluster has all these components inside.


I think, this apply for pre-CAN-BUS cars only, check sticker on your radio, if there are 3pins labled ENA DATA CLK in middle section of mini-iso connector:

some 2000 models can be switched from canbus to this 3lb protocol.

 

static text

moving text

									DEC	255-DEC		ASCII	REAL
0	0	0	0	1	1	1	1		15	240			ADDR?
1	0	1	0	1	1	0	1		173	82		R
1	0	1	1	1	1	1	0		190	65		A
1	0	1	1	1	0	1	1		187	68		D
1	0	1	1	0	1	1	0		182	73		I
1	0	1	1	0	0	0	0		176	79		O
1	0	0	1	1	0	0	1		153	102		f	_
1	0	1	1	1	0	0	1		185	70		F
1	0	1	1	0	0	1	0		178	77		M
1	0	1	1	1	0	0	1		185	70		F
1	0	1	1	0	0	1	0		178	77		M
1	1	0	0	1	1	1	0		206	49		1
1	1	0	1	0	0	1	0		210	45		-
1	1	0	0	1	1	1	0		206	49		1
1	1	0	1	1	1	1	1		223	32
1	1	0	1	1	1	1	1		223	32
1	1	0	1	1	1	1	1		223	32
1	1	0	1	1	0	1	0		218				CRC
0	0	0	0	1	1	1	1		15	240			ADDR?
1	1	0	1	1	1	1	1		223	32
1	1	0	1	1	1	1	1		223	32
1	1	0	1	1	1	1	1		223	32
1	1	0	0	0	1	1	1		199	56		8
1	1	0	0	0	1	1	0		198	57		9
1	1	0	1	0	0	0	1		209	46		.
1	1	0	0	1	1	0	0		204	51		3
1	1	0	1	1	1	1	1		223	32
1	0	1	1	1	0	0	1		185	70		F
1	0	1	1	0	0	1	0		178	77		M
1	1	0	0	1	1	1	0		206	49		1
1	1	0	1	0	0	1	0		210	45		-
1	1	0	0	1	1	1	0		206	49		1
1	1	0	1	1	1	1	1		223	32
1	1	0	1	1	1	1	1		223	32
1	1	0	1	1	1	1	1		223	32
1	1	0	0	0	1	0	0		196				CRC

CRC=MODULO(SUM(255-DEC),256) = ((SUM(0xFF-HEX))&0xFF)

Starting "pulse" ?

packet

so, it's SPI!?

TODO: try to use SPI libs to hadle this. http://www.gammon.com.au/forum/?id=10892

ENABLE is bi-direction "wire":

from audi concert plus

audi concert (nav)/chorus

and here is something like "ping" to radio:

Arduino code to receive from radio and to send text to cluster is down there:

Arduino code to send data from RS232 to cluster 

Arduino code to receive data from radio

comunication betwen arduino reader and actual radio

video of code in action

How to enable CD changer input on audi chorus I

How to enable CD changer input on audi chorus I

 From schematics, difrence between chorus and concert which has CD changer input,  is just few parts and enable CD-changer by coding as in here. Parts need to be soldered on main board to enable are this:

Audio input filter:

C1407 2.2uF/10V(THT, 2.54mm)

C1427 2.2uF/10V (THT, 2.54mm)

C1424 820pF (SMD 0805)

C1404 820pF (SMD 0805)

R1401 10kΩ (SMD 0805)

R1421 10kΩ (SMD 0805)

R1402 10kΩ (SMD 0805)

R1422 10kΩ (SMD 0805)

Location of all components on bottom side of PCB.

Power supply switch:

BSP452 (cheepest on ebay)

R2018 150Ω (SMD 0805)

Location of 150Ω resistor is on first picture.

Comunication lines Data-In, Data-out, clock

R5301 1kΩ (SMD 0805)

R5304 1kΩ (SMD 0805)

R5305 1kΩ (SMD 0805)

R5202  2,2kΩ (SMD 0805)

R5303  2,2kΩ (SMD 0805)

V5301 BC848B any BC848/850 is ok

 V5302 BZX84C5V6

V5303 BZX84C5V6

V5304 BZX84C5V6

Location of 3x1k and 2x2k2 is on first picture.

Price for this components is 0.68€ at gme.sk.

After this, you need CD changer emulator and simple circute, which emulate "mode" button press. For so small project is perfect attiny25/45/85 actualy 85 is cheapest one. For attiny support in arduino, follow this tutorial. Sketch for tiny:

code

Schematic  and pcb for this "mode button emulator":

schematics

PCB