I always wondered why FPGAs are(still?) that popular...
Way back when, in some research work I did, in my field they were mostly
used for building stuff that didn't exist, as a test bed.
For fun we once implemented a univac on it, because we could.
Ron
On 1/23/20 12:29 PM, Peter C. Wallace wrote:
On Thu, 23 Jan 2020, Chris Albertson wrote:
Date: Thu, 23 Jan 2020 10:17:44 -0800
From: Chris Albertson <albertson.ch...@gmail.com>
Reply-To: "Enhanced Machine Controller (EMC)"
<emc-users@lists.sourceforge.net>
To: "Enhanced Machine Controller (EMC)"
<emc-users@lists.sourceforge.net>
Subject: Re: [Emc-users] Real-time OS for machine controllers
The trouble with the Mesa FPGA design is that it depends on a
computer with
good real-time performance. It can generate steps but I don't thing
you
can run a position or velocity PID control loop on the FPGA.
LinuxCNCs design paradigm requires realtime, this is a design decision
that is supported by our Hostmot2 real time firmware. We have other
firmware that implements motion in the FPGA but this is not suited to
LinuxCNCs model.
You might argue that its an old fashioned model but many high
performance CNC systems and Robotics controllers use LinuxCNCs model
of a capable real time host (real OS with file I/O loadable modules,
unlimited memory, massive floating point performance etc etc) Some of
these use Linux and others use real time windows varients often with
Ethercat Peripherals. This makes for a powerful extensible realtime
toolkit (like LinuxCNCs HAL) and complex realtime responsive
coordinated motion. Basically for this type of system you still
need a very capable real time controller hub even if the motor
controllers implement torque, velocity, or position loops
Peter Wallace
Mesa Electronics
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