> On Sat, 9 Mar 2019 at 05:48, Kirk Wallace <kwall...@wallacecompany.com> wrote:
> >
> > I have used AVR chips to add features to LinuxCNC that where not easy to
> > do with a parallel port alone. Now I would like to take a try at using
> > one of these Blue Pills:
> > > https://www.ebay.com/itm/222676944274
> When I found that an actual Arduino wasn't capable enough for a recent
> project I used one of these instead.
> https://www.adafruit.com/product/3800
> Lots more RAM, a relatively fast CPU and decent floating-point means
> that it can run serial kinematics (which is what I wanted)

I think CPU Cortex-M4 is a lot slower than arduino but without operating system 
they do nothing else than running application. These kind of micro controllers 
is what I am used with, they usually have the required hardware for control of 
a servo or ordinary electric motor or other periodic real time tasks.

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