I see the 7C81 board is now listed for sale on Mesa's website. So far the only example I've seen of anyone actually successfully running LinuxCNC on the Raspberry Pi is Gene Heskett and his account of accomplishing this seems too daunting for me to attempt. It seems to me that the combination of the 7c81 and the Pi would have wide appeal if only there was a ready-to-run image. I'm wondering if the developers have any plans to make this available?
On Sat, Jun 15, 2019 at 10:16 AM Andrew <[email protected]> wrote: > сб, 15 черв. 2019 о 18:01 Peter C. Wallace <[email protected]> пише: > > > > > I've had LinuxCNC running 24/7 on the 7C80+RPI for about 11 months now > > with no > > hardware issues. This is with a 40 pin cable about 2" long between the > RPI > > and > > 7C80. If you have interface problems. its very likely a SI ( Signal > > Integrity ) > > issue with the cabling. > > > > Thanks for your reply! > I actually had a decent link when 7i90HD was not connected to any external > hardware. But when I tried to control some steppers as I did with > Beaglebone, it was a disaster. > > > > > The (7C80,7C81,7I90) SPI interface uses the FPGAs GCLK. This means it can > > run up > > to 50 MHz or so with a fast host, but it does require good signal > > integrity. > > > > This is great. So when are 7Cs expected in the store? And what is the price > range? > > For random/longer cable connections using a async SPI interface in the FPGA > > that > > simulates the synchronous interface would allow better tolerance of SI > > issues ( > > by oversampling / filtering the clock and data in signals ) at the cost > of > > lowering the maximum clock speed to say 8-10 MHz. I have not bothered > with > > this > > since it works reliably with short cables (Actually it works with longer > > cables > > if the clock source impedance is correct for proper series termination, I > > can > > drive a 7I90 in SPI mode at 50 MHz send/recv with another FPGA card and a > > 2 foot > > cable) > > > > _______________________________________________ > Emc-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-users > -- "Anyone who believes exponential growth can go on forever in a finite world is either a madman or an economist." -Kenneth Boulding, economist Corporations are NOT people and money is NOT speech! _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
