step/gen on expansion ports on 7i76E

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25 Mar 2020 14:15 #161432 by awetmore
I have a machine with a Gecko G540 that I'm moving from parallel port control to the 7i76E (which I already have -- I know other cards are a better fit).

Is it possible to put the step/gen pins on expansion port 1 so that they match the pinout of the G540? It looks like this would require a custom bit file, but I haven't figured out if there is a master repository with a set of well known configurations.

Here is the pinout that I'd be looking for:
1: output 1
2: x step
3: x dir
4: y step
5: y dir
6: z step
7: z dir
8: a step
9: a dir
10: input 1
11: input 2
12: input 3
13: input 4
17: output 1
18-25: GND

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25 Mar 2020 14:26 #161435 by PCW
I don't think there's a standard one but I can make one up
Do you want the first stepgens (0..3) on the G540?

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25 Mar 2020 15:53 #161465 by awetmore
Yes please, that would be great.

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25 Mar 2020 17:14 #161473 by PCW
7I76E firmware with G540 connection on P1

stepgens 0..4 on P1 (stepgen 4 is for G540 chargepump)
stepgens 5..9 on 7I76E
1 PWMgen for G540 spindle
second encoder on G540 input pins

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File Name: 7i76e-540_...3-25.zip
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The following user(s) said Thank You: andypugh, awetmore

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27 Mar 2020 15:23 - 27 Mar 2020 15:23 #161710 by awetmore
Thanks! I'm just waiting on my DB25 adapter for the 7i76 (should be here in a few days) and will give it a try. I've created the config and it looks like it'll do what I want. Hopefully this is useful to other G540/7i76E users too.
Last edit: 27 Mar 2020 15:23 by awetmore.

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