On Sat, 15 Feb 2020 21:29:21 -0500, Dennis Lee Bieber wrote:

> On Sat, 15 Feb 2020 20:38:00 -0000 (UTC), Martin Gregorie
>  declaimed the following:
>
>
>>However, you should definitely take note of Dennis's comment about bulk,
>>and consider whether you'd be better using a Pi Zero, or one of the
>>small Arduinos, rather than a bigger and much thicker Pi with its bank
>>of
>
>  Problem with the Arduino route (I considered mentioning them but
> refrained) is that they don't run a formal OS in which programs are
> loaded from a file system. The versions using an ARM Cortex-M processor
> (Due, for example) can usually support FreeRTOS if one needs interrupt
> handling or multiple threads of execution, but they still expect to boot
> directly to /the/ application which runs from flash memory -- RAM is
> basically a very large "register set" only used for variable storage
> during execution. The Cortex-A of R-Pi and BeagleBone Black both use
> flash for a file system and load programs into RAM for execution
>
>    The Due is 84MHz Cortex M3 (no floating point), 512kB flash,
96kB RAM
> (in banks of 64 and 32kB).
>
>  A TIVA TM4C123G LaunchPad (since the specs are on the box I have
> available -- the Due specs I have to Google) is an 80MHz Cortex M4F
> (32-bit with hardware floating point), 256kB flash, 32kB SRAM, 2kB
> EEPROM. One thing it is unusual in is that it has way too many timers (6
> 64-bit, which can be split into 12 32-bit, AND 6 32-bit which can split
> into 12 16-bit ). But it is cheap (presuming TI still makes them --
> about $13).
>
>  The larger TM4C1294 is 120MHz M4F, 1MB flash, 256kB SRAM, 6kB
EEPROM,
> only 8 32-bit timers, but has Ethernet connector [your application will
> need to include a TCP/IP stack to use it].

My Mistake - I thought the Beaglebone Black ran Linux. The Pi Zero looks
like flavour of the day for a more sylph-like case.


--
Martin    | martin at
Gregorie  | gregorie dot org

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