raspberry pi 3 model b+ support realtime

Hello everyone,
I would like to ask some questions about rasraspberry pi 3 model b+

• raspberry pi 3 model b+ is found any problem with Latency or real-time
• if the raspberry pi not good solution for providing real-time app what the alternative?

raspberry comunication is not that good
only up to 500mm/min at max 5000steps per decond

use a ITX like J1800/1900
M525D

better then all if a real mashine is on the system

mahmoudgad wrote:

raspberry pi 3 model b+ is found any problem with Latency or real-time

It has usable realtime performance, but there isn't a very good selection of interface hardware.

The GPIO pins can be used, but encoder counting and step generation have to be done in software (like a parallel port system)
There is a driver (hal_gpio) but I don't see it in the LinuxCNC source tree, just in the Wiki.

There is some oddly laid-out info here. wiki.linuxcnc.org/cgi-bin/wiki.pl?RPi3BPreemptRT

The other option is to use the SPI bus and the Mesa 7i90 . Support for that is included in LinuxCNC

mahmoudgad wrote:

if the raspberry pi not good solution for providing real-time app what the alternative?

A normal 3 to 10 year old PC with parallel port will do just fine.

The other option is to use the SPI bus and the Mesa 7i90 . Support for that is included in LinuxCNC

Also the 7C80 and 7C81 which are a mechanical match to the RPI
(and should be available towards the end of April)

Any update on these(7C80)? I'm not yet seeing them in the various stores selling Mesa boards.