Help with duo-color matrix mapping

stahl · October 13, 2023, 8:09pm

Hello there!

I want to build my version of a SEQ4+ and I am currently a bit stuck with the mapping of the LEDs.

Specifically, in the configuration file MBSEQ_HW.V4, there is a mapping variable BLM8X8_DOUT_GP_MAPPING. Can someone help me how to figure out, how those mappings are laid out?

I attached a spreadsheet with the configuration I have in mind (in italic the definitions I’m unsure if they make sense). I want to use BLM8X8_DOUT_GP_MAPPING = 3. Is it correct, that this configuration uses 2 SR for the LEDs in a Matrix configuration?

Cheers, stahl

[blm8x8.ods](< base_url >/applications/core/interface/file/attachment.php?id=16026&key=8daac57a07f5199f7b532c8efcff3f02)

T.K · October 15, 2023, 12:04pm

Hi,

GP LEDs are (unfortunately) not free assignable, therefore BLM8X8_DOUT_GP_MAPPING has been introduced to consider different hardcoded options:

Option #1 (Wilbas frontpanel) can be derived from following schematic: http://www.midibox.org/dokuwiki/lib/exe/fetch.php?media=wilba_mb_seq:wilba_mbseq_pcb.pdf
Source Code shows following mapping:

// BLM_X DOUT -> GP LED mapping // 0 = 15,16 1 = 13,14 2 = 11,12 3 = 9,10 // 4 = 1,2 5 = 3,4 6 = 5,6 7 = 7,8
Option #2 (Antilogs MBSEQV4L SRIO Panel) schematic: http://wiki.midibox.org/doku.php?id=seq_v4l_mk._ii&s[]=antilog
Option #3 (Antilogs MBSEQV4 Panel) - can’t find the schematic.
Source Code shows following mapping:

// BLM_X DOUT -> GP LED mapping // left/right half offsets; green,red // 0 = 8,9 1 = 11,10 2 = 13,12 3 = 15,14 // 4 = 40,41 2 = 43,42 3 = 45,44 4 = 47,46

So, from documentation point of view, Option #1 is probably the most save solution because you can compare Wilba’s schematic with yours.

The mapping is implemented in https://github.com/midibox/mios32/blob/master/apps/sequencers/midibox_seq_v4/core/seq_ui.c line #3579 (search for “seq_hwcfg_blm8x8.dout_gp_mapping == 1”)

Best Regards, Thorsten.

stahl · October 19, 2023, 10:14am

Thank you TK, looking at the code and config helped me to figure it out.

Matrix A LED mapping (BLM8X8\_DOUT\_GP\_MAPPING 3) 01234567 M1 M2 GP1-R GP1-G GP2-R GP2-G GP3-R GP3-G GP4-R GP4-G M3 DT1-R\* DT1-G DT2-R DT2-G DT3-R DT3-G DT4-R DT4-G M4 LED\_COPY LED\_PASTE LED\_CLEAR LED\_MOVE M5 M6 GP5-R GP5-G GP6-R GP6-G GP7-R GP7-G GP8-R GP8-G M7 DT5-R DT5-G DT6-R DT6-G DT7-R DT7-G DT8-R DT8-G M8 LED\_SCROLL LED\_FAST LED\_ALL LED\_SELECT \* DT = DIRECT\_TRACK (selection button leds)

I didn’t test this yet, but it should be right.

Cheers, stahl

T.K · October 19, 2023, 4:44pm

It looks correct when I compare with the code, and actually it seems that the comment is wrong:

 // BLM\_X DOUT -\> GP LED mapping // left/right half offsets; green,red // 0 = 8,9 1 = 11,10 2 = 13,12 3 = 15,14 // 4 = 40,41 2 = 43,42 3 = 45,44 4 = 47,46

should be:

 // BLM\_X DOUT -\> GP LED mapping // left/right half offsets; green,red // 0 = 9,8 1 = 11,10 2 = 13,12 3 = 15,14 // 4 = 41,40 2 = 43,42 3 = 45,44 4 = 47,46

So, 0 and 4 follow the same “swapped order” like other Duo-coloured LEDs.

do you agree?

Some additional hints:

the relation between row M1..M8/column 0..7 and the 74HC595 output pins can be confusing - many people connected the pins in mirrored order in the past - be careful about that, otherwise the GP pin assignments have to be changed in the source code (-> you will need a local build).
Wilbas schematic is a good reference in which order data lines have to be connected
1st and 2nd color (typically “red” and “green”) can be swapped during runtime in the Options page
for all other LEDs the assignment doesn’t matter because they are free configurable in the MBSEQ_V4.HW file - you can try out once the front panel is working

Best Regards, Thorsten.

stahl · November 2, 2023, 4:57pm

Hey T.K.

I agree, the comment in the code is wrong… I also noticed.

Thanks for the further comments!

Best, Stahl

T.K · November 4, 2023, 8:17pm

Hi Stahl, thanks for the confirmation, the comment is corrected now in the source code

Best Regards, Thorsten.