Raspberry Pi 4 with Mesa 7c81

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30 Oct 2022 23:18 #255514 by PCW
Here is a bitfile that should be closer (along with the pin out file source):

 

File Attachment:

File Name: 7c81_cofhald.zip
File Size:90 KB


Note that the chargepump is run by stepgen 4
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31 May 2023 20:10 #272604 by COFHAL
In my application I am going to use a 7C81 with a 7I88 card, and I installed the firmware 7C81_7I88. Now the problem is that I need a PWM output to be able to control my spindle. It would be possible to compile a .BIT file to include a pPWM output, it could be replacing one of the available STEPGENs or one of the other two available ports on 7C81.

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31 May 2023 21:21 #272606 by PCW
Is the 7C81_7I88 firmware OK other than needing one additional PWM signal?

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01 Jun 2023 20:33 #272653 by COFHAL
Yes the firmware is OK, only need chage one GENSTEP for PWM and DIR.

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01 Jun 2023 23:01 #272660 by PCW
OK Ill try and get to this in the next day or so

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03 Jun 2023 18:50 #272829 by PCW
7C81+7I88 6 step/dir 1 PWM 1 sserial

 

File Attachment:

File Name: 7c81_7i88ss1p.zip
File Size:91 KB


I can re-arrange so the sserial is dropped and you still have 7 stepgens if needed
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05 Jun 2023 22:33 #272981 by COFHAL
Thanks for your support. I would prefer to have the 7 stepgen available, and not the serial.

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06 Jun 2023 15:42 #273013 by PCW
 

File Attachment:

File Name: 7c81_7i88_1pd.zip
File Size:91 KB
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25 Sep 2023 19:30 #281609 by jmitjavi
Where you able to get the Mesa 7c81 working with the Match3 board, and if so how did you do it?  Thanks,

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16 Jan 2024 02:39 - 16 Jan 2024 02:41 #290822 by richcolvin
I’m just getting started with LinuxCNC, with an end goal of running it on a Raspberry Pi (4B or 5), and driving stepper motors on my rose engine lathe. 

I have LinuxCNC running on a Raspberry Pi 4B which is connected to a Mesa 7c81 board.  I assume each stepper motor will need a driver and currently have each one hooked up to a StepperOnline DM542T.

The current gap I’m trying to fill is how to get from the Mesa 7c81 board to the 5 StepperOnline DM542Ts (Spindle, X, Z, A, & C).  In particular, I am at a loss on how to get the 3 needed signals to the DM542Ts:  Step, Direction, & Enable. 

I am seeking some guidance on where to find instructions or manuals which can me help get started.  I recognize that this is probably a very basic set of questions, so I appreciate whatever help can be provided to point me in the right direction. 
 
Last edit: 16 Jan 2024 02:41 by richcolvin.

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