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.
Jon
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