[HH] Arduino and Raspberry PI

[Greg London]

Hm, spec for fpga is here:

http://www.latticesemi.com/documents/HB1004.pdf

Not too shabby.  It's a small FPGA, but good for glue.

Almost everyone who does embedded stuff
needs some external glue logic to interface with the real
world. This is a nice way to eliminate external hardware
and still allow customization.

5k of clb's is  probably enough to make a custom
serial interface, or custom parallel, or custom
timer or custom whatever interface.

No idea how hard the toolflow is to use, but the price is nice.

Greg


> Look at the TS-7500, about $100, full Debian Linux on ARM with an FPGA
> wrapped around it.  Default FPGA load is 8 serial ports, alternate loses 4
> serial to get CANbus, code is open source so you can hack your own FPGA
> build.
>
> *
> Drew Van Zandt
> Cam # US2010035593 (M:Liam Hopkins R: Bastian Rotgeld)
> Domain Coordinator, MA-003-D.  Masquerade aVST
> *
>
>
> On Mon, Mar 25, 2013 at 11:07 PM, Tom Metro
> <tmetro+hhacking at gmail.com>wrote:
>
>> markw at mohawksoft.com wrote:
>> > The Raspberry PI has a good amount of processing, but lacks the I/O
>> > to do what the arduino can do.
>>
>> Not disagreeing, but what sort of I/Os have you wanted that it didn't
>> have?
>>
>> While you can add I/O expanders, like the Gertboard (see list archives),
>> last I saw pricing it was $46, so it adds significantly to the project
>> cost.
>>
>> You would think they would have beefed up the native I/O on the Pi,
>> given it was made for hacking, but I guess the educational projects they
>> envisioned for it didn't involve that much low-level hardware
>> interaction, or at least not enough to justify impacting their $35
>> target price. (Their vision seemed to be more about letting each kid
>> have their own computer on which to hack software. Not so much about
>> hardware interfacing.)
>>
>> The interesting thought experiment is what would it have added to the
>> price to make the Pi Arduino shield compatible, as you suggest. For a
>> little bit more product cost, it would reduce the cost of expansion.
>>
>> There are other ARM-based boards with better I/O and similar performance
>> capable of running a full Linux, but you'll pay more than $35, and
>> you'll have a much smaller supporting community.
>>
>>  -Tom
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