On Thu, 21 Jan 2021 22:54:01 +0000, gareth evans wrote:

> On 21/01/2021 21:51, A. Dumas wrote:
>> gareth evans  wrote:
>>> ... and it's a great disappointment to me that it's not a 64-bit
>>> processor
>>
>> Name one.
>>
>>
> As the Pi4 is a 64 bit processor, one assumed that all future
> developments by that company would be 64 bit.

Why? I see no reason for such an IOT device to need more than 32 bits at
the outside: it has no embedded OS, is not multi-tasking and doesn't need
to be, so the only good reason to have more than 16 bits of address space
is to accommodate the size of modern support libraries - after all its
designed to allow current C and C++ libraries to be used, and lacking any
i/o devices faster than USB, its unlikely to be processing large data
volumes.

I'd say that reducing its power consumption is more important: its
quiescent state uses around 10 mW - a bit more than some battery driven
applications where quiescent periods are much longer than bursts of
activity might be comfortable with.

It looks interesting to play with anyway, and I'll certainly be
interested to see how using its FSMs can be used and how they affect code
size.



--
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Martin    | martin at
Gregorie  | gregorie dot org

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