[chbot] ESP8266 - the book, by Neil Kolban

[Richard Jones]

Hi Charles,

Good to hear from you and many thanks for the SPI and device state tips.
I'm really into heavy cheating, especially to achieve robust behaviour.

It is a nice point that interrupt latency will be a function of the device
mode. For my application, relaying Wifi commands to an IR sender for
heatpump control, I expect that the commands will highly correlated with
device state. So I don't need to get 99.999% reliability under all
conditions, just the conditions that I am interested in.

Richard


On Tue, Aug 11, 2015 at 10:04 AM, Charles Manning <cdhmanning at gmail.com>
wrote:

> 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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