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SBC with large GPIO pin count
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theoldwizard1:
I am think of a project that I would like to build using one of the current day SBC (Raspberry Pi, etc) but I have a few requirement.


* At least 48 (64 would be better) GPIO pins, without using a I²C or SPI, that are easily accessible (i.e no soldering). I need to be able to "read" 48 pins as fast as possible.
Multiple cores
On chip RAM (off chip is just too slow) for at least some of the data.
Does such a SBC exist ?
stj:
ST NUCLEO-144 series.
LapTop006:
Look at the TI Sitara line (used in the BeagleBoard's), although often not by default (you switch the pinmux) they get up around what you're asking for, although probably not in any board that already exists.

Using an FPGA to mux the data is probably a more conventional method these days.
theoldwizard1:
It turns out, if you use a genuine Raspberry Pi Compute Module (a daughter board in the same form factor as an SDIMM) with the Compute Module IO Board (the mother board with the SDIMM socket) you get access to ALL of the GPIO pins.  You do NOT get all of the functionality of the an RPi B or RPi B+, but you do get the GPIO pins !
theoldwizard1:

--- Quote from: LapTop006 on November 20, 2018, 09:37:51 am ---Look at the TI Sitara line (used in the BeagleBoard's), although often not by default (you switch the pinmux) they get up around what you're asking for, although probably not in any board that already exists.

Using an FPGA to mux the data is probably a more conventional method these days.
--- End quote ---
The point is, I don't WANT the hassle of a FPGA !

The TI Sitata line is the only line used on a commonly supported SBC that has actual on-chip RAM, a useful feature for this application.
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