MOVnet

Hi!

I have a Pioneer DEH3700MP and I wonder if it's possible to make an front panel using a 8051 microcontroller (or maybe a PIC). So I can put the keys to control my tuner at any place and use a DOT MATRIX display.


Does anyone know the communication protocol between the tuner and the front panel ? I've take a look at the Pioneer schematics and seems to be an assyncronous protocol with a TX (KYDT - Keyboard data ?) and RX (DPDT - Display data?) lines.

With this protocol maybe will be possible to control the unit with a PC. so the radio and MP3 Player functions will be handdle by the unit and the PC will be free for other tasks.

Here the diagram of the front pannel circuit (with 8051):

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MOVnet

Hi Again

I'm hacking my front panel right now..... The protocol is a simple UART at TTL level. 38400 kbps 8,n,1.
This frame will write "FM 100" at the display.

D0,0F,00,5D,1A,38,1A,38,0A,00,00,00,00,00,0B,31,14 ,32,00,00,07,00,00,00,00,00,04,60,1F,00,0A

Each character uses 2 bytes (word) , each bit enable one display segment.

Word : XXXA CGBK XNEF DXgH
X - Don't care
G - G1
g - G2

At the frame above, 1A-38 is the number 0. See the display figure below.


The Keys:

Pooling - sent every 20 ms.
C0,00,40

Volume Up
C5,08,33

Volume Down
C5,01,3A

BTB
C3,08,35

Memory 1
C4,01,3B
C4,01,3B

Memory 2
C4,02,3A
C4,02,3A

Memory 3
C4,04,38
C4,04,38

Memory 4
C3,01,3C
C3,01,3C

Memory 5
C4,08,34
C4,08,34

Memory 6
C3,02,3B
C3,02,3B

LOC
C1,01,3E

Band
C2,02,3C

Up
C2,04,3A
C2,04,3A

Right
C1,04,3B
C1,04,3B

Down
C1,08,37
C1,08,37

Left
C2,08,36
C2,08,36

Audio
C3,04,39
C3,04,39

TA
C5,04,37
C5,04,37

Eject
C2,01,3D
C2,01,3D


It's a start... I hope that someone help me to confirm that's correct.
Regards

MOVnet

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