Raspberry Pi 8268825 Manual de Usario

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Raspberry Pi Gets Industrial
Posted by Tue, Apr 08 2014 13:25:00 Andrew Back on
A sneak peek at the brand new Raspberry Pi Compute Module and IO Board.
Yesterday the Raspberry Pi Foundation announced a new addition to their hardware family,
the Compute Module, which is targeted at business and industrial users. Designed from the
outset to be incorporated into larger designs, this is packaged in an extremely compact SO-
DIMM form factor.
The Compute Module dispenses with ports, leaving their specification down to those who
design the mainboard into which it will be inserted. It also dispenses with an Ethernet
controller, since not every application will have a need for this. However, one thing that it
does include, aside from obviously the Broadcom SoC, is 4GB of flash storage — after all, it
wouldn't be much use if it couldn't boot.
The SO DIMM connector is great for production use, but it's clearly not the most convenient -
of hardware interfaces for bench prototyping, hence why the module launched with a
companion IO board that packs a healthy selection of connectors and 0.1” pitch breakout.
Setting up
The IO board provides HDMI and USB host ports for
hooking up a display and input devices. However,
my preferred hardware console is a trusty serial
connection, and so with the Compute Module
inserted into the SO DIMM socket on the IO board, I -
connected up a USB UART.
Power was then supplied via the Micro USB
connector labelled Power In.
Resources
The Compute Module boots in just the
same way as the Raspberry Pi Model A
or B, with the difference being that the
boot device is on-board flash storage
rather than an SD card.
Logging in and executing a few familiar
commands we see that we have a root
filesystem of 3.5GB and that the only
network interface is loopback.
I decided to connect a USB Ethernet
adapter to see if this would provide a
new network interface.
However, while the Ethernet adapter powered up
and was detected by Linux, it wasn't supported by
the kernel or a loadable module. So it looks as
though adding support for peripherals will require
copying a new kernel or modules onto the on-
board flash which should be simple enough to —
do.
Hello World
As mentioned previously the IO board provides
plenty of 0.1” breakout, and just to confirm that
the GPIO pins functioned as expected I hooked
up an LED and attempted to toggle the pin
from the bash prompt. Sure enough, upon
exporting the pin, setting its direction to output
and value to 1, the LED illuminated. No
surprises here!
Bountiful prototyping
The IO board provides access to 46 pins of
GPIO, which is a good deal more than you get
with a Raspberry Pi Model A or B. In addition to
which the 0.1” pitch headers also provide plenty
of GND, 1v8, 3v3 and 5v power pins. And just
above the two long rows of headers are jumpers
which allow you to set the logic levels for pins 0-
27 and 28 45 respectively, to either 1v8 or 3v3.-
Interestingly, the J15 Micro USB connector is
labelled “USB BOOT”. From notes in the
schematic it appears that this is used to boot the
module from a USB connected host, and once
booted access is provided to the on board flash. -
Presumably this is how you would load an O/S and applications.
The board also provides CSI and DSI ports for serial cameras and displays double the —
number in fact, with two of each.
Although the connectors used for these ports
are higher density than those used with a
Model A or B, and so at the very least new flex
cables will be required. My guess is that the
current Raspberry Pi cameras will be
supported via a new cable but that rema— ins
to be seen.
Conclusion
There is no shortage of embedded solutions for industrial applications, but how many of them
give you a moderately powerful Linux system with all that I/O and such a vibrant ecosystem,
for a price tag of around only $30 (at quantity 100) ? And for those who have already been
using or looking at using the Raspberry Pi in such applications, their prayers have been
answered.
Strategically it's an interesting move for the Raspberry Pi Foundation and easy to see how
industry adoption will lead to opportunities in both directions, not to mention providing a new
source of revenue that will enable the Foundation to do even more to promote the study of
computer science.
While the Compute Module and IO Board may be targeted at business and industrial uses, I'd
be amazed if the maker community don't incorporate them into some fantastic projects. Also
together these may now be regarded as the new “premium option” for those who like to have
as much I/O as possible. And in time I fully expect to see some exciting third party
“mainboards” which accommodate a or multiple Compute Modules and integrate — —
interesting peripherals.
— Andrew Back
Resources: Raspberry Pi Compute Module Hardware Guide
Read this article on DesignSpark
For more Raspberry Pi Resources, visit our Raspberry Pi Design Centre

Especificaciones del producto

Marca: Raspberry Pi
Categoría: No categorizado
Modelo: 8268825

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