Due to processor power limitations? For this application a WiFi interface would
be rarely used apart from a means to configure the product. Bluetooth will be
GATT based to allow monitoring of sensor data on a phone app (sometime in the
fure, due to the Bluetooth SIG fees involved!!).
So if the WiFi performance is average it won't matter much. But of the
Bluetooth stack in NuttX is likely a performance bottleneck I am probably
better off sticking with plan a and offload all Bluetooth LE Gatt stuff to the
SiLabs module and simply exchange data as required via SPI.
On 29/10/2022, 01:06, "Disruptive Solutions" <disruptivesolution...@gmail.com>
wrote:
I tried some Wifi and Bluetooth but know that some MCUs cannot handle them
very well at the same time.
Op za 29 okt. 2022 1:20 a.m. schreef Alan C. Assis <acas...@gmail.com>:
> Hi Tim,
>
> On 10/28/22, Tim Hardisty <t...@jti.uk.com.invalid> wrote:
> > Bit of a tangential question this, but I know there are folk on here who
> > are much more conversant with the way NuttX can be used with WiFi and
> > Bluetooth modules than I am.
> >
>
> I think these are important questions and other people could face
> similar issues in the future.
>
> > I may have an opportunity forced on me to have to respin my custom board
> > which currently has a SiLabs Bluetooth SoC as well as the main SAMA5D2
> > processor. I used that module as I already have experience of it - but
> that
> > predates my NuttX journey.
> >
> > I see there are some very good value combined WiFi + Bluetooth modules
> now
> > (Espressif for example...and I know there's a well-known proponent of
> those
> > devices here lol) and, having seen a few other questions here, I am
> thinking
> > that I can go the HCI route and make use of the Bluetooth Stack in
NuttX:
> > and add WiFi capability to my board at the same time. Winner!
> >
>
> First let me explain the differences:
>
> Espressif modules are not used as external modules on NuttX,
> everything is integrated inside the chip.
>
> During the WildernessLab's presentation on NuttX Workshop their team
> shown an ESP32 solution sharing WiFi as an external module.
> But they didn't use the default USRSOCK route, they implemented a new
> solution at home.
>
> > I'm hoping I can program up a suitable module with generic radio
> > co-processor software (HCI I think, and whatever is needed for WiFi) and
> > access it via UART from my main processor and have it all under the
NuttX
> > system in a much more easily managed manner than a separate app on the
> > SiLabs SoC that just happens to communicate on some way with my main app
> on
> > the SAMA5D2.
> >
> > Have I got this right? Is an Espressif module a good choice (email me
> direct
> > if you want to !!)?
> >
>
> For Bluetooth (BLE) if there is a HCI firmware to SiLabs chip, then it
> could be possible to you use it, but you'll need to do some tests and
> debugging to get things working.
>
> For WiFi things are more complex because you need to implement a
> USRSOCK yourself to the chip.
>
> I never tested others possibilities: i.e. share Internet using SLIP
> between ESP32 and SAMA5D2, should be an easier route if it works, but
> of course you wil be limited to UART speed.
>
> Ethernet could be a better option (since ESP32 has Ethernet hardware),
> but it seems like an ugly and expensive workaround.
>
> BR,
>
> Alan
>
