Version 11 (modified by wornwinter, 4 years ago)
Adding a link to the maudio bebob wiki page.

M-Audio Project-Mix IO

This page is to help with developing support for the Project-Mix I/O and similar devices.

For more information, see:

I've been working with Bus Hound, and identified the following information:

ProjectMix Notes
-------------------
(Dashes added in hex for readability)

Initialisation procedure
-------------------------
-Show light pattern.
-Initialise internal routing/volume.
-Set spdif port to coaxial.
-Set sample rate to 44100hz. (This happens twice)
-Set clock source to internal with digital inputs muted.
-Set sample rate to 44100hz.
-------------------------

Base address
0xfffff0000000

Register	Function
0b00		Control. Used for selecting clocks and setting the sample rate. Also controls digital ports.
			
			Misc
			---------
			00 ff 00 02 - 00 00 00 00 : Show light pattern on interface. Probably aesthetic.
										Visual feedback.
			Clocking
			---------
			00 ff 00 04 - 00 04 00 00 : Set clock source to internal with digital inputs muted.
			00 ff 00 04 - 00 04 03 00 : Set clock source to internal with digital inputs unmuted.
			00 ff 00 04 - 00 04 01 00 : Set clock source to external (digital).
			00 ff 00 04 - 00 04 02 00 : Word clock.
			
			Sample Rate (Not exactly sure why there are two writes)
			------------
			00 ff 18 00 - 90 01 ff ff : Set samplerate to 44100Hz
			00 ff 19 00 - 90 01 ff ff 
			
			00 ff 18 00 - 90 02 ff ff : Set samplerate to 48000Hz
			00 ff 19 00 - 90 02 ff ff 
			
			00 ff 18 00 - 90 03 ff ff : Set samplerate to 96000Hz
			00 ff 19 00 - 90 03 ff ff 
			
			Digital Port Selection
			------------
			00 ff 00 04 - 00 04 00 00 : Set digital input to spdif.
			00 ff 00 04 - 00 04 00 01 : Set digital input to ADAT.
			
			00 08 b8 80 - 04 10 02 01 : Set spdif input port to coaxial.
			00 08 b8 80 - 04 10 02 00 : Set spdif input port to optical.

			
------------------------------------------------------------------------------------------------------------
Base Address 0xffc700000000

Register    Function
0070 0010	Internal mixing and volume. Seems to be set to "80 00 80 00 - 80 00 80 00" before some routing commands.
			Zeroing out this register initialises the internal routing/volume to their default settings.
			
			
			
Firmware Information

The device uses modified bridgeCo firmware. The details are as follows:

$ firewire-request /dev/fw1 read 0xffffc8020000 70
result: 000: 62 72 69 64 67 65 43 6f 01 00 00 00 00 00 00 00 bridgeCo........
result: 010: 0c 6c 0d 00 cb 80 b1 00 91 00 01 00 01 00 00 00 .l..............
result: 020: 32 30 30 37 30 37 31 33 30 38 30 35 34 34 00 00 20070713080544..
result: 030: 00 00 00 00 00 00 00 00 00 00 08 20 00 00 18 00 ........... ....
result: 040: 32 30 30 35 30 33 31 34 31 38 32 38 34 35 00 00 20050314182845..
result: 050: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
result: 060: 00 00 00 00 00 00 00 00 78 56 34 12 20 0b ea 21 ........xV4. ..!	

$ cat /proc/asound/ProjectMix/firewire/firmware
Manufacturer:	bridgeCo
Protocol Ver:	1
Build Ver:	0
GUID:		0x000D6C0C00B180CB
Model ID:	0x10091
Model Rev:	1
Firmware Date:	20070713
Firmware Time:	080544
Firmware ID:	0x0
Firmware Ver:	0
Base Addr:	0x20080000
Max Size:	1572864
Loader Date:	20050314
Loader Time:	182845
		
------------------------
Rotary encoder protocol
------------------------

Idle:
ffc1 ffc7 0060 0000 <- 00 00 00 00  00 01 00 00

Level up:
ffc1 ffc7 0060 0000 <- 00 00 00 01  00 01 00 00

Level down:
ffc1 ffc7 0060 0000 <- 00 00 00 02  00 01 00 01

Headphone 1 up:
ffc1 ffc7 0060 0000 <- 00 01 00 00  00 01 00 00

Headphone 1 down:
ffc1 ffc7 0060 0000 <- 00 02 00 00  00 01 00 01

Headphone 2 up:
ffc1 ffc7 0060 0000 <- 00 00 01 00  00 01 00 00

Headphone 2 down:
ffc1 ffc7 0060 0000 <- 00 00 02 00  00 01 00 01

Note that the last byte seems to be changeable. Sometimes it is 00, othertimes it is 01. I'm not 100% sure why, however,
the important thing seems to be the first 4 bytes. In general 01 = up, 02 = down. With each encoder having its own byte.

------------------------			

Additionally, some firewire dumps are here: https://www.dropbox.com/s/tmyidxjjypqqoeg/projectmix-dump.zip

Implementation

Below are my current definitions:

#define PROJECTMIX_BASE_ADDR_A		0xfffff0000000ULL
#define PROJECTMIX_CONTROL_REG		0x0b00

#define PROJECTMIX_BASE_ADDR_ROUTING	0xffc700000000ULL
#define PROJECTMIX_ROUTE_REG		0x0700000


#define OPERATION_CONTROL 0
#define OPERATION_ROUTE 1

#define SAMPLERATE_44_A 		0x00ff18009001ffff
#define SAMPLERATE_48_A			0x00ff18009002ffff
#define SAMPLERATE_96_A			0x00ff18009003ffff

#define SAMPLERATE_44_B 		0x00ff19009001ffff
#define SAMPLERATE_48_B			0x00ff19009002ffff
#define SAMPLERATE_96_B			0x00ff19009003ffff

#define CLOCK_INTERNAL_DM		0x00ff000400040000
#define CLOCK_INTERNAL_DU		0x00ff000400040300
#define CLOCK_EXTERNAL			0x00ff000400040100
#define CLOCK_WORD			0x00ff000400040200

#define ROUTE_DEFAULT			0x0000000000000000

I'm currently initializing the device in the following way:

WriteRegister(OPERATION_CONTROL, PROJECTMIX_CONTROL_REG, 0x00ff0002); //Show lights on mixer.
WriteRegisterOct(OPERATION_ROUTE, PROJECTMIX_ROUTE_REG, ROUTE_DEFAULT); //Set internal volume/routing to default.
WriteRegisterOct(OPERATION_CONTROL, PROJECTMIX_CONTROL_REG, CLOCK_INTERNAL_DM); //Set clock source to internal with digital inputs muted.
WriteRegisterOct(OPERATION_CONTROL, PROJECTMIX_CONTROL_REG, SAMPLERATE_44_A); //Set samplerate to 44100Hz.
WriteRegisterOct(OPERATION_CONTROL, PROJECTMIX_CONTROL_REG, SAMPLERATE_44_B);

Current Progress

I have managed to create a new (non-functional) driver within FFADO. It can currently initialize the device, set the clock source and the sample rate. If someone could help me out with this project, that'd be great! I'm unsure of the audio streaming protocol. You can see an example of it here using the 3-4 stereo output, unfortunately, the free version of Bus Hound only captures the first 8 bytes of each transaction :(

  45                     1h     11520  ISOC   01 0b 00 98  90 01 c3 d2  ........                 1.1.0        
  45                     1h     11520  ISOC   01 0b 00 48  90 01 c2 f3  ...H....                 2.1.0        
  45                     1h     11520  ISOC   01 0b 00 f8  90 01 c2 14  ........                 3.1.0        
  45                     1h     11520  ISOC   01 0b 00 a8  90 01 c1 35  .......5                 4.1.0        
  45                     1h     11520  ISOC   01 0b 00 58  90 01 c0 56  ...X...V                 5.1.0        
  45                     1h     11520  ISOC   01 0b 00 08  90 01 bb 77  .......w                 6.1.0        
  45                     1h     11520  ISOC   01 0b 00 b8  90 01 ba 98  ........                 7.1.0        
  45                     0h      7168  ISOC   40 00 00 00  40 00 00 00  @...@...                 8.1.0        
  45                     1h     11520  ISOC   01 0b 00 68  90 01 b9 b9  ...h....                 9.1.0        
  45                     0h      7168  ISOC   40 00 00 00  40 00 00 00  @...@...                10.1.0        
  45                     1h     11520  ISOC   01 0b 00 18  90 01 b8 da  ........                11.1.0        
  45                     0h      7168  ISOC   40 00 00 00  40 00 00 00  @...@...                12.1.0        
  45                     1h     11520  ISOC   01 0b 00 c8  90 01 b7 fb  ........                13.1.0        
  45                     1h     11520  ISOC   01 0b 00 78  90 01 b7 1c  ...x....                14.1.0        
  45                     0h      7168  ISOC   40 00 00 00  40 00 00 00  @...@...                15.1.0        
  45                     1h     11520  ISOC   01 0b 00 28  90 01 b6 3d  ...(...=                16.1.0        
  45                     0h      7168  ISOC   40 00 00 00  40 00 00 00  @...@...                17.1.0        
  45                     1h     11520  ISOC   01 02 00 e0  90 01 ff ff  ........                18.1.0        
  45                     1h     11520  ISOC   01 02 00 90  90 01 ff ff  ........                19.1.0        
  45                     0h      7168  ISOC   40 00 00 00  40 00 00 00  @...@...                20.1.0        
  45                     1h     11520  ISOC   01 02 00 40  90 01 ff ff  ...@....                21.1.0        
  45                     0h      7168  ISOC   40 00 00 00  40 00 00 00  @...@...                22.1.0        
  45                     1h     11520  ISOC   01 02 00 f0  90 01 ff ff  ........                23.1.0        
  45                     1h     11520  ISOC   01 02 00 a0  90 01 ff ff  ........                24.1.0        
  45                     0h      7168  ISOC   40 00 00 00  40 00 00 00  @...@...                25.1.0        
  45                     1h     11520  ISOC   01 02 00 50  90 01 ff ff  ...P....                26.1.0        
  45                     0h      7168  ISOC   40 00 00 00  40 00 00 00  @...@...                27.1.0        
  45                     1h     11520  ISOC   01 0b 00 00  90 01 c5 8f  ........                28.1.0        
  45                     1h     11520  ISOC   01 0b 00 b0  90 01 c4 b1  ........                29.1.0        
  45                     0h      7168  ISOC   40 00 00 00  40 00 00 00  @...@...                30.1.0        
  45                     1h     11520  ISOC   01 0b 00 60  90 01 c3 d2  ...`....                31.1.0        
  45                     0h      7168  ISOC   40 00 00 00  40 00 00 00  @...@...                32.1.0    

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