[chbot] ESP8266 - the book, by Neil Kolban

[Charles Manning]

Richard

I have not used this device, but I have used devices like the Nordic
Bluetooth LE chip that has a similar architecture in that it runs a
wireless stack on the same CPU that you can use for processing.

The Nordic device runs a Coretex M0 at 32 MHz. Sometimes it chews all
of that running the BT stack. Worst case interrupt response is
2milliseconds (milli, not micro). That is only during certain BT modes
such as scanning.

I would expect this device has similar limitations, but whether it's
microseconds or milliseconds I have no clue.

If you're sending infra red you can do some heavy cheating though.
Instead of pulsing a GPIO udser ISR control , you can set up a pattern
and send it via SPI (just hook up the MOSI data to the led and ignore
the rest).


On Mon, Aug 10, 2015 at 11:41 PM, Richard Jones
<richard.jones.1952 at gmail.com> wrote:
> Mark,
>
> Many thanks for posting the link to the ESP8266 book.
>
> Very useful, something in there for everyone from the simplest start to the
> Eclipse supported dev environment, and some very useful explanations about
> how to setup and use the callbacks. The GPIO section removes some of the
> mystery. The references at the end are the most comprehensive that I have
> seen.
>
> Completely missing is information on interrupt priority and real time
> performance. That could be a nice project for someone to add.
>
> I had been considering whether to make a wifi controlled infra red remote
> control using the ESP8266. With the (lack of) information to hand I'm not
> convinced that a GPIO and timer approach will be 100% reliable. I guess an
> ESP8266 and an AVR or PIC micro could remove the uncertainty.
>
> Richard
>
> On Thu, Aug 6, 2015 at 11:11 AM, Mark Atherton <markaren1 at xtra.co.nz> wrote:
>>
>> All,
>>
>> A mate just sent me this link -
>> http://neilkolban.com/tech/wp-content/uploads/2015/08/The-ESP8266-Book-August-2015.pdf
>>
>> Have only skimmed through it, but it holds promise as being (at the very
>> least) a starting point for definitive documentation on this very low cost
>> WiFi chip.
>>
>> More power to the man...
>>
>> -mark
>>
>>
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