Arduino Nano 33 IoT support

[fgallaire]

No description provided.

[ladyada]

lgtm - please be aware that there's not enough memory in circuitpy to talk to the wifi module and do internetty things :)

[dhalbert]

Looks good, but it would be good to add wifi module pins.

[ladyada]

checked against https://github.com/arduino/ArduinoCore-samd/blob/master/variants/nano_33_iot/variant.cpp

[dhalbert]

Thanks for the changes. There are still some missing ESP32 pins, still, mainly having to do with the separate TX/RX lines for updating, but it's not vital they're added. GPIO33 is called "...BUSY" by us, but '...ACK" on the Arduino schematic. I'm not sure it's worth changing these now or not. We could just get the board in. @ladyada do you have an opinion?

[ladyada]

oh shoot i missed the serial nina pins - lets merge so this is in before the next realaseand @fgallaire please submit a pr for those two pins :)

[dhalbert]

Schematics:

Typical Adafruit board:

Arduino Nano 33 IoT:

[ladyada]

yay - will merge once passing

[fgallaire]

yay - will merge once passing

a noob question before:
I named the NINA RESET_N ESP_RESET after other boards naming, but RESET_N is linked to +3V3 while typical Adafruit board have ESP_RESET linked to GND, so should I rename my ESP_RESET in ESP_RESET_N ?

[ladyada]

nope - the pin itself is the same :)

[dhalbert]

Thank you!

[fgallaire]

lgtm - please be aware that there's not enough memory in circuitpy to talk to the wifi module and do internetty things :)

Hello, nevertheless I would like to test it, so I need to upgrade the NINA firmware. So I need a Serial Passthroug firmware for the Nano IoT but I don't find the repo to fork/how to do it.

[dhalbert]

Check out this thread: https://forum.arduino.cc/index.php?topic=654833.0
The Arduino forums and website are probably best for inquiring about this.

[fgallaire]

Thanks @dhalbert I'm so focused on CircuitPython that I forgot that it's an Arduino board ;-)
Flashing the firmware with the Arduino IDE works fine:
https://www.arduino.cc/en/Tutorial/WiFiNINA-FirmwareUpdater

[fgallaire]

I have done my best:

• adafruit_esp32spi as frozen module
• Adafruit NINA firmware 1.6 flashed via Arduino IDE
• MOSI pin changed to PB09 to match the pin change adafruit/nina-fw@9e76479

But always the same error:

RuntimeError: Timed out waiting for SPI char