Hi Milan,

On 7/30/23, Milan Obuch <nuttx-...@dino.sk> wrote:
sic
>> I got an S2 Mini V1.0.0 WEMOS.CC like yours and confirmed the issue.
>> After changing the pins to 33 and 34 (as you noticed pins 43 and 44
>> are not available, Wemos' mistake) the serial console is not showing
>> up.
>
> Hi,
>
> do you see any possible solution to this problem? Now, as you can test
> it locally, it should be easier for you to test it.
>

Yes, now I can help you!

>> This board use the ESP32-S2 with internal SPI flash, so there are some
>> small differences in relation to the original ESP32-S2 with external
>> SPI flash.
>
> What kind of differences? What impact do they cause to NuttX
> configuration and build?
>

I think there are some incompatibility with current ESP32S2
initialization, but I cannot test with JTAG because they also didn't
extern the JTAG pins.

>> The ESP32-S2 and S3 USB IP is the same DWC USB controller used on
>> Raspberry and some STM32 chips. So we could use the existing driver on
>> NuttX as starting point.
>
> That's fine. Do we need some glue to use existing driver? Working USB
> would make this board more useful.
>

Exactly! We already have ESP32-S3 USB Dev support, but S2 uses
different initialization.

We need to compare with ESP-IDF to understand what they are doing to
initialize the USB on ESP32-S2.

BR,

Alan

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