Raspberry Pi 4 with Mesa 7c81

Here is a bitfile that should be closer (along with the pin out file source):

 

Note that the chargepump is run by stepgen 4

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.

Is the 7C81_7I88 firmware OK other than needing one additional PWM signal?

Yes the firmware is OK, only need chage one GENSTEP for PWM and DIR.

OK Ill try and get to this in the next day or so

7C81+7I88 6 step/dir 1 PWM 1 sserial

 

I can re-arrange so the sserial is dropped and you still have 7 stepgens if needed

Thanks for your support. I would prefer to have the 7 stepgen available, and not the serial.

 

Where you able to get the Mesa 7c81 working with the Match3 board, and if so how did you do it?  Thanks,

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.