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Thread: Front Panel protocol

  1. #1
    Newbie MOVnet's Avatar
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    Sep 2005
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    Front Panel protocol - PC-Tuner control

    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):
    Attached Images Attached Images  

  2. #2
    Newbie MOVnet's Avatar
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    Sep 2005
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    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
    Attached Images Attached Images  

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