timlebrun / arduino-cdj

Pioneer CDJ (800 Mk2) reverse engineering project

CDJ800 (MK2) HID Arduino Code

This is a repository containing all reverse engineering data i can find about the internal SPI bus of my CDJ800 Mk2s.
My goal is to replace the MAIN board with a microcontroller and enable them to control a software via MIDI of USB-HID.

As of now, I won't have a working CDJ anymore to continue working on this...
I fried the one I had on hand while rerouting the debug wiring Feel free to fork this and/or add to it

DISPLAY → MAIN

Structure

0x00	0x01	0x02	0x03	0x04	0x05	0x06	0x07	0x08	0x09	0x0a	0x0b	0x0c	0x0d	0x0e	0x0f	0x10	0x11	0x12	0x13
0x01	0x10 ?	?	VNLS	PITH	PITL			JGPH	JGPL	JGAH	JGAL	JTCH		BTN1	BTN2	BTN3	BTN4	BTN5

All the BTN registers are ON when pushed and OFF when not.

0x03 VNLS

Single uint_8
Vinyl Speed Adjust rotary knob.

0x04 PITH & 0x05 PITL - Pitch

16 bits Integer
PITH (pitch high byte) and PITL (pitch low byte)
Pitch fader value

0x08 JGPH & 0x09 JGPL - Jog Wheel Position

16 bits Integer
JGPH (jog position high byte) and JGPL (jog position low byte)
Jog Wheel relative position value (allows to determine the way of rotation)

0x0a JGAH & 0x0b JGAL - Jog Wheel Acceleration

16 bits Integer
JGAH (jog acceleration high byte) and JGAL (jog acceleration low byte)
Jog Wheel acceleration (deceleration actually, stands by at 0xFFFF)

0x0e BTN1

• 0x10 - Loop In
• 0x20 - Reverse
• 0x40 - Loop Out
• 0x80 - Cue

0x0f BTN2

• 0x01 - Play
• 0x02 - Loop Exit

0x10 BTN3

• 0x01 - Previous Track
• 0x02 - Next Track
• 0x04 - Search Forward
• 0x08 - Search Backward

0x11 BTN4

• 0x01 - Previous Folder
• 0x02 - Next Folder
• 0x04 - Quick Return (not tested)
• 0x08 - Eject
• 0x10 - Jog Mode
• 0x20 - Tempo Wide / 10%
• 0x40 - Master Tempo

0x12 BTN5

• 0x01 - Call Next Cue
• 0x02 - Call Previous Cue
• 0x04 - Memory
• 0x08 - Delete
• 0x10 - Text Mode
• 0x20 - Time Mode

MAIN → DISPLAY

This one still has to be reverse engineered. But this seems to be a complete frame, with no CD in, on starup.

A few stuff that caught my eye :

• The last column is a CRC (same as documented for the CDJ1000).
• The 18th (before last) seems to describe the jog wheel indacator state (same as documented for the CDJ1000);
• Bytes 0x0b, 0x0b & 0x0d of package 0x20 seem related to the pitch (BPM values maybe ?)
• 0xd0 or 0x47 seems to be related to the vinyl mode

Counter	0x01	0x02	0x03	0x04	0x05	0x06	0x07	0x08	0x09	0x0a	0x0b	0x0c	0x0d	0x0e	0x0f	0x10	Jog	CRC
0x00	0x50	0x11	0x50	0x00	0x01	0x04	0x10	0x10	0x15	0x00	0x00	0x00	0x58	0x00	0x00	0x00	0x00	0x43
0x10	0xf0	0x2b	0x81	0x04	0xb8	0x40	0x08	0xa1	0x3f	0x00	0xb3	0x00	0x00	0x00	0x00	0x00	0x00	0x33
0x20	0xa8	0x20	0x88	0x80	0x02	0x0a	0x28	0x88	0x0a	0x00	0xee	0xb6	0xd6	0x00	0x00	0x00	0x00	0x10
0x30	0xa6	0x36	0xf0	0xc1	0x13	0x0f	0x3d	0x70	0x6a	0x00	0x00	0x00	0x00	0x00	0x00	0x00	0x00	0xc6
0x40	0x02	0x00	0x00	0x00	0x00	0x00	0x00	0x00	0x00	0x00	0x00	0x00	0x00	0x00	0x00	0x00	0x00	0x02
0x50	0x00	0x00	0x00	0x00	0x04	0x00	0x00	0x00	0x00	0x00	0x00	0xd0	0x47	0x00	0x00	0x00	0x00	0x1b

License

I guess its complicated since its actually proprietary stuff ?
If u want to use this data, I don't mind, just please credit me a little.
And keep me updated i'm interested about what can be done with it !