172 lines
5.6 KiB
ReStructuredText
172 lines
5.6 KiB
ReStructuredText
.. _arduino_nano_33_iot:
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Arduino Nano 33 IOT
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###################
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Overview
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********
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The Arduino Nano 33 IOT is a small form factor development board with USB,
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Wifi, Bluetooth, a 6 axis IMU, and secure element.
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.. image:: img/nano_33_iot.jpg
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:align: center
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:alt: Arduino Nano 33 IOT
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Hardware
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********
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- ATSAMD21G18A ARM Cortex-M0+ processor at 48 MHz
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- 256 KiB flash memory and 32 KiB of RAM
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- One user LED
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- One reset button
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- Native USB port
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- Wifi and Bluetooth via a u-blox NINA-W102
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- ATECC608A secure element
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- LSM6DS3 six axis accelerometer and gyro
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Supported Features
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==================
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The arduino_nano_33_iot board configuration supports the following hardware
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features:
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+-----------+------------+------------------------------------------+
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| Interface | Controller | Driver/Component |
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+===========+============+==========================================+
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| ADC | on-chip | Analog to digital converter |
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+-----------+------------+------------------------------------------+
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| COUNTER | on-chip | Pulse counter |
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+-----------+------------+------------------------------------------+
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| DMA | on-chip | Direct memory access unit |
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+-----------+------------+------------------------------------------+
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| Flash | on-chip | Can be used with LittleFS to store files |
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+-----------+------------+------------------------------------------+
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| GPIO | on-chip | I/O ports |
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+-----------+------------+------------------------------------------+
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| HWINFO | on-chip | Hardware info and serial number |
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+-----------+------------+------------------------------------------+
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| NVIC | on-chip | nested vector interrupt controller |
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+-----------+------------+------------------------------------------+
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| PWM | on-chip | Pulse Width Modulation |
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+-----------+------------+------------------------------------------+
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| SPI | on-chip | Serial Peripheral Interface ports |
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+-----------+------------+------------------------------------------+
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| SYSTICK | on-chip | systick |
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+-----------+------------+------------------------------------------+
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| USART | on-chip | Serial ports |
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+-----------+------------+------------------------------------------+
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| USB | on-chip | USB device |
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+-----------+------------+------------------------------------------+
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| WDT | on-chip | Watchdog |
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+-----------+------------+------------------------------------------+
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Other hardware features are not currently supported by Zephyr.
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The default configuration can be found in the Kconfig
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:zephyr_file:`boards/arduino/nano_33_iot/arduino_nano_33_iot_defconfig`.
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Connections and IOs
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===================
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The `Arduino store`_ has detailed information about board
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connections. Download the `schematic`_ for more detail.
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System Clock
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============
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The SAMD21 MCU is configured to use the 8 MHz internal oscillator
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with the on-chip PLL generating the 48 MHz system clock. The internal
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APB and GCLK unit are set up in the same way as the upstream Arduino
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libraries.
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Serial Port
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===========
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The SAMD21 MCU has 6 SERCOM based USARTs. SERCOM5 is available on pins 1 and 2.
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PWM
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===
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The SAMD21 MCU has 3 TCC based PWM units with up to 4 outputs each and a period
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of 24 bits or 16 bits. If :code:`CONFIG_PWM_SAM0_TCC` is enabled then LED0 is
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driven by TCC2 instead of by GPIO.
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SPI Port
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========
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The SAMD21 MCU has 6 SERCOM based SPIs. SERCOM1 is available on pins 1, 14,
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and 15.
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USB Device Port
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===============
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The SAMD21 MCU has a USB device port that can be used to communicate
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with a host PC. See the :zephyr:code-sample-category:`usb` sample applications for
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more, such as the :zephyr:code-sample:`usb-cdc-acm` sample which sets up a virtual
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serial port that echos characters back to the host PC.
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Programming and Debugging
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*************************
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The Nano 33 IOT ships the BOSSA compatible UF2 bootloader. The
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bootloader can be entered by quickly tapping the reset button twice.
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Additionally, if :code:`CONFIG_USB_CDC_ACM` is enabled then the bootloader
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will be entered automatically when you run :code:`west flash`.
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Flashing
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========
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#. Build the Zephyr kernel and the :zephyr:code-sample:`hello_world` sample application:
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.. zephyr-app-commands::
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:zephyr-app: samples/hello_world
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:board: arduino_nano_33_iot
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:goals: build
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:compact:
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#. Connect the Nano 33 IOT to your host computer using USB
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#. Connect a 3.3 V USB to serial adapter to the board and to the
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host. See the `Serial Port`_ section above for the board's pin
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connections.
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#. Run your favorite terminal program to listen for output. Under Linux the
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terminal should be :code:`/dev/ttyACM0`. For example:
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.. code-block:: console
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$ minicom -D /dev/ttyACM0 -o
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The -o option tells minicom not to send the modem initialization
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string. Connection should be configured as follows:
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- Speed: 115200
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- Data: 8 bits
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- Parity: None
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- Stop bits: 1
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#. Tap the reset button twice quickly to enter bootloader mode
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#. Flash the image:
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.. zephyr-app-commands::
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:zephyr-app: samples/hello_world
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:board: arduino_nano_33_iot
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:goals: flash
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:compact:
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You should see "Hello World! arduino_nano_33_iot" in your terminal.
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References
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**********
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.. target-notes::
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.. _Arduino Store:
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https://store.arduino.cc/arduino-nano-33-iot
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.. _schematic:
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https://content.arduino.cc/assets/NANO33IoTV2.0_sch.pdf
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