SRs wired parallel?

Design Concepts
1

Hi, after two years I’m close to finish my LC now.

It consists of two units with one core. One Unit is the mixer and assignment part and the other is a small one with the right hand side of the LC with the MTC display, jogwheel, transport- and function buttons.

My problem is, that I want some buttons to be present on both units. But since my LC is fully loaded there are not enough shift registers left to define them twice. I guess it isn’t possible anyway to define two pins to the same function in the lc_io_table.inc.

Now the question:

is it possible to wire the serial chain line parallel to two SR’s so that they both are handled as SR number 6 and if I push the play button on SR6a both play-LEDs on SR6a and SR6b light up?

I’m REALLY hardly trying to avoid building another core for the second unit, at first I’m trying to save money (for the MFs & the upcoming MB64E built into my M-Audio Keystation 8)) and second, what is much more important, there is no space for a core in the small unit and the cases including panels are handworked out of metal. I definitively don’t want to build such a case again. Never ever. No way.  :stuck_out_tongue:

Thanks in advance

2

Now the question:

is it possible to wire the serial chain line parallel to two SR’s so that they both are handled as SR number 6 and if I push the play button on SR6a both play-LEDs on SR6a and SR6b light up?

… why don’t you just wire the buttons (Buttons-B) to the same pins as Buttons-A? - This should work.

I guess it isn’t possible anyway to define two pins to the same function in the lc_io_table.inc.

… in an answer to this question, I would be interested too.  :slight_smile:

Greets, Roger

3

Thanks for your answer.

… why don’t you just wire the buttons (Buttons-B) to the same pins as Buttons-A? - This should work.

The reason is quite simple, I would need 16 extra wires for the buttons and leds in the cable between the two units. Together with all the power/ground, SR lines and the wires for the assignment display this would be a quite fat cable. I fear this would also heavily increase the latency because the DIN registers are read periodically. Currently I’m using an old monitor cable (18 wires).

4

I fear this would also heavily increase the latency because the DIN registers are read periodically

… not really. As you write, the register get read… not the number of buttons connected to them.

But for shure, the fat cable thing is a serious contra argument.

Greets, Roger

5

Mhh, I think if the parallel wiring doesn’t work I’ll go for two monitor cables then.

Thanks a lot