ContextQMD
Back to Zephyr

Overview

boards/arduino/nano_33_iot/doc/index.rst

4.4.03.3 KB
Original Source

.. zephyr:board:: arduino_nano_33_iot

Overview

The Arduino Nano 33 IOT is a small form factor development board with USB, Wifi, Bluetooth, a 6 axis IMU, and secure element.

Hardware

  • ATSAMD21G18A ARM Cortex-M0+ processor at 48 MHz
  • 256 KiB flash memory and 32 KiB of RAM
  • One user LED
  • One reset button
  • Native USB port
  • Wifi and Bluetooth via a u-blox NINA-W102
  • ATECC608A secure element
  • LSM6DS3 six axis accelerometer and gyro

Supported Features

.. zephyr:board-supported-hw::

Connections and IOs

The Arduino store_ has detailed information about board connections. Download the schematic_ for more detail.

System Clock

The SAMD21 MCU is configured to use the 8 MHz internal oscillator with the on-chip PLL generating the 48 MHz system clock. The internal APB and GCLK unit are set up in the same way as the upstream Arduino libraries.

Serial Port

The SAMD21 MCU has 6 SERCOM based USARTs. SERCOM5 is available on pins 1 and 2.

PWM

The SAMD21 MCU has 3 TCC based PWM units with up to 4 outputs each and a period of 24 bits or 16 bits. If :code:CONFIG_PWM_SAM0_TCC is enabled then LED0 is driven by TCC2 instead of by GPIO.

SPI Port

The SAMD21 MCU has 6 SERCOM based SPIs. SERCOM1 is available on pins 1, 14, and 15.

USB Device Port

The SAMD21 MCU has a USB device port that can be used to communicate with a host PC. See the :zephyr:code-sample-category:usb sample applications for more, such as the :zephyr:code-sample:usb-cdc-acm sample which sets up a virtual serial port that echos characters back to the host PC.

Programming and Debugging

.. zephyr:board-supported-runners::

The Nano 33 IOT ships the BOSSA compatible UF2 bootloader. The bootloader can be entered by quickly tapping the reset button twice.

Additionally, if :code:CONFIG_USB_CDC_ACM is enabled then the bootloader will be entered automatically when you run :code:west flash.

Flashing

#. Build the Zephyr kernel and the :zephyr:code-sample:hello_world sample application:

.. zephyr-app-commands:: :zephyr-app: samples/hello_world :board: arduino_nano_33_iot :goals: build :compact:

#. Connect the Nano 33 IOT to your host computer using USB

#. Connect a 3.3 V USB to serial adapter to the board and to the host. See the Serial Port_ section above for the board's pin connections.

#. Run your favorite terminal program to listen for output. Under Linux the terminal should be :code:/dev/ttyACM0. For example:

.. code-block:: console

  $ minicom -D /dev/ttyACM0 -o

The -o option tells minicom not to send the modem initialization string. Connection should be configured as follows:

  • Speed: 115200
  • Data: 8 bits
  • Parity: None
  • Stop bits: 1

#. Tap the reset button twice quickly to enter bootloader mode

#. Flash the image:

.. zephyr-app-commands:: :zephyr-app: samples/hello_world :board: arduino_nano_33_iot :goals: flash :compact:

You should see "Hello World! arduino_nano_33_iot" in your terminal.

References

.. target-notes::

.. _Arduino Store: https://store.arduino.cc/arduino-nano-33-iot

.. _schematic: https://content.arduino.cc/assets/NANO33IoTV2.0_sch.pdf