> -----Original Message-----
> From: Jon Elson [mailto:el...@pico-systems.com]
> Sent: March-10-19 9:58 AM
> To: Enhanced Machine Controller (EMC)
> Subject: Re: [Emc-users] STM32 Blue Pill --> distance between pins
>
> On 03/10/2019 05:18 AM, Nicklas Karlsson wrote:
> >> Hey Chris,
> >>
> >> AFAIK, the Pi has better HDMI support compared to the Beagle but then it
> was designed more for multimedia. The Beagle PRUs have the advantage
> that they have access to some of the Beagle Processor RAM. That gives
> them a bit of an advantage over the PI/32 bit hybrid using SPI.
> >>
> The PRUs are 200 MHz 32-bit RISC processors. There are 3
> shared RAM data sections between the PRUs and the ARM. The
> PRUs have a limited number of direct IO pads that bypass all
> the ARM high-level I/O fabric, and so can be read/written at
> the 5 ns rate of the PRU, which is a big plus for various
> special bit-fiddling I/O tasks.
>
> Charles Steinkuehler wrote a general driver for Machinekit
> that uses the PRU for step generation, PWM and encoder input.
I probably posted this already but if not here's the BeagleBone and MachinekIt
running the knee stepper motor (Gecko) and Y axis DC Servo (HP_UHU). Xylotex
interface board.
https://youtu.be/9GF709ZfLRQ
It's not closed loop with an encoder through the Beagle. The HP_UHU does that.
John Dammeyer
http://www.autoartisans.com
>
> Jon
>
>
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