board: add support for the Arduino Nano Matter

[silabs-bozont]

Hey friends!
This PR adds support for the Nano Matter including:

• Basic platform, CoreAPI and flashing support
• GPIO
• PWM
• I2C/Wire
• SPI
• Bluetooth LE

All of these have been tested and confirmed to function, but feel free to do any additional testing!

ADC support is missing from the main Zephyr repo for the Nano Matter - I'm currently working on adding it. Once it's there I'll also include it here in a separate PR. Besides this the board has a pretty well rounded functionality.

OpenOCD 0.12.0-arduino1-static will have to be added to the package.json file - but I assume you keep that separately. This is needed for flasing the Nano Matter.

Please, let me know if you have any remarks and I'll fix them as soon as possible!

[CLAassistant]

All committers have signed the CLA.

[pillo79]

Thanks for mentioning the new required tool in the PR notes. Please add it to extra/artifacts/_common.json so that CI generates the correct files automatically.

[silabs-bozont]

@pillo79 Thanks for mentioning the new required tool in the PR notes. Please add it to extra/artifacts/_common.json so that CI generates the correct files automatically.

Thank you for the pointer, I've added it. Could you please check if it's correct?

[pillo79]

LGTM (not tested though). @silabs-bozont you should accept the CLA for us to use this in our repo though 😉 thanks!

[leonardocavagnis]

Thanks for the contribution!
I ran some tests, here are my results:

Loader / Bootloader

• Loader building for nano_matter: ✅ OK
  Tested loader generation via ./extra/build.sh nano_matter, works fine.
• Burn bootloader from IDE: ✅ OK

Flashing

• Flashing blank sketch: ✅ OK
• Flashing Blink sketch: ✅ OK

GPIO / Analog

• GPIO reading (Examples -> Basics -> digitalReadSignal.ino example): ✅ OK
• Analog read (Examples -> Basics -> AnalogReadSerial.ino): ❌ FAIL – A0 not defined

Bluetooth LE

• ArduinoBLE test (Peripheral LED example): ✅ OK, works (note: LED logic is inverted)
  Some strange initial output on serial:

[8D�[J[00:00:00.063,964] <inf> bt_hci_raw: Lower HCI transport: efr32
[00:00:00.164,123] <inf> bt_hci_raw: Bluetooth enabled in RAW mode

Needs unreleased version of ArduinoBLE and this fix:
ArduinoBLE commit 18c814d1b75cadf482509c5026506034d8a710fc

I2C / SPI

• I2C with sensor (tested with Modulino Buttons): ✅ OK
• SPI with sensor: ❌ FAIL
  Works with Silabs-Arduino core, but not with Zephyr implementation:
  Tested code:

#include <SPI.h>
#define CS_PIN 10

void setup() {
  pinMode(CS_PIN, OUTPUT);
  digitalWrite(CS_PIN, HIGH);
  SPI.begin();
}

void loop() {
  digitalWrite(CS_PIN, LOW);
  SPI.transfer(0xAA);
  digitalWrite(CS_PIN, HIGH);
  delay(1000);
}

Verified with logic analyzer (attached 2 screenshots: with and without Zephyr core):

[leonardocavagnis]

EDIT: For the SPI test, initially I tried SPI_MODE0 and it failed. Using SPI_MODE3 makes the SPI communication work correctly also with the Zephyr core.
fyi @pennam

[pennam]

EDIT: For the SPI test, initially I tried SPI_MODE0 and it failed. Using SPI_MODE3 makes the SPI communication work correctly also with the Zephyr core. fyi @pennam

@leonardocavagnis #288 should fix your "SPI with sensor" test. Do you mind give it a spin?