TTL (PWM) Laser head and Mesa 7i76

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03 Dec 2021 10:43 #228272 by RoberCNC
Hi PCW, the wiring from the 5i25 P3 to DB25 conector of the BB is going to be 1 to 1? I mean pin1 from the P3 to pin1 of the DB25, pin2 to pin2, etc...

Thx very much.

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03 Dec 2021 15:11 #228289 by PCW
Yes, you normally use a parallel printer cable for this

(if you use the HDR P2 you need a flat cable adapter from HDR26 to DB25)

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03 Dec 2021 15:25 #228292 by RoberCNC
Sorry, the P2 wanted to say, I got confused, P3 (the DB25) I have it busy with the 7i76.
I have asked if the pins are the same to prepare the wire.

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03 Dec 2021 15:43 #228294 by PCW
On P2, HDR Pin 1 connects to DB25 Pin 1, but the other pins are
not in order because of the way DB25 and HDR26 pins are numbered.
You don't need a special cable however just a flat cable with IDC
connectors (one HDR26 , one DB25) on each end.
(Mesa can supply these)
The following user(s) said Thank You: RoberCNC

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03 Dec 2021 15:53 #228297 by RoberCNC
Ok, I'll wait to do it then with the pins you tell me based on the custom firmware.

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29 Jan 2022 11:02 - 29 Jan 2022 11:03 #233424 by RoberCNC
Hi PCW, is there news of the custom firmware?
Last edit: 29 Jan 2022 11:03 by RoberCNC.

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29 Jan 2022 20:24 #233480 by PCW
Here is a 5i25 config with PWM on P2 (it also adds 2 more step/dir outputs)

 

File Attachment:

File Name: 5i25_7i76_pwmd.zip
File Size:97 KB
Attachments:
The following user(s) said Thank You: RoberCNC

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29 Jan 2022 21:34 #233488 by RoberCNC
Very grateful PCW!!!
I understand that the pinout of the Chinese BB is like the one it has.
I see that in the zip comes a .vhd file, what is it for?
The .bit I imagine is to flash the 5i25 again like I did when I bought it.

Thank you very much, really, how much I want to try it

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06 Feb 2022 18:24 #234140 by RoberCNC
Hi PCW.
Just flashed the firmware and verified, it seems to be everything ok.

Now I have some doubts, the first of all I run the Pncconf Wizard and I don´t know what I must to choose on the Mesa Card 0 step at Board Name selection tab (5i25, 5i25-Internal Data, etc...) neither at firmware selector, the 7i76_pwmd doesn´t appears as such.

In the other hand I supposed that with this new firmware I have to remap and reconfig all the pinouts I have, isn´t it?

Thank you very much as allways.

Rober

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06 Feb 2022 18:41 - 06 Feb 2022 18:44 #234146 by PCW
pncconf is not going to help at this point.

I would use your existing 7I76 configuration (if you have one)
as none of the 7I76 connections have changed, only a added PWM
generator and a couple of step generators have been added to P2
so the only changes needed to your existing hal file are adding
the laser PWM support.
 
Last edit: 06 Feb 2022 18:44 by PCW.

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