3 Nov
2013
3 Nov
'13
5:10 a.m.
On Sun, 3 Nov 2013 11:06:39 -0000
"Robert Jarratt" <robert.jarratt at ntlworld.com> wrote:
I wonder if bare metal access to GPIO on the
beaglebone would be any better
than the Raspberry Pi? I have had a quick look at the docs and I can't find
anything about the speed of GPIO. I found one post which suggests you can
achieve 1.5MHz
Just using GPIOs is the wrong aproach anyway, IMHO. You really want
some hardware to preprocess the signals somewhat. Also keep in mind
that those ARM SOCs as used on the RPi or Beaglebone Black have some
rather sophisticated DMA capable SPI, PWM, ... peripherals. You did
somthing wrong when you didn't get faster then 6 ms.
BTW: Microchip has some PICs with a build in "Configurable Logic Cell".
AFAIK that is somthing similar to a GAL / CPLD. Probably enough to do
the (de)serializing of the bitstream. Then the PIC could hand over the
data via some DMA capable interface to a Beaglebone Black that cares
about storing it on its SD card...
--
\end{Jochen}
\ref{http://www.unixag-kl.fh-kl.de/~jkunz/}