.. zephyr:board:: serpente

Overview

The Serpente is a very small low-cost development and prototyping board equipped with 4MiB flash storage, a PWM enabled RGB led and 6 I/O pins. The board comes with 3 different USB connector options: USB Type-C plug, USB Type-C socket and USB Type-A plug.

Hardware

ATSAMD21E18A ARM Cortex-M0+ processor at 48 MHz
256 KiB flash memory and 32 KiB of RAM
Extra 4MiB SPI flash memory
RGB User LED
Reset button
Native USB port

Supported Features

.. zephyr:board-supported-hw::

Connections and IOs

The Serpente documentation_ has detailed information about the board including pinouts_ and the schematic_.

System Clock

The SAMD21 MCU is configured to use the 8MHz internal oscillator with the on-chip PLL generating the 48 MHz system clock.

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 prints "Hello World!" to the host PC.

Programming and Debugging

.. zephyr:board-supported-runners::

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

Flashing

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

.. zephyr-app-commands:: :zephyr-app: samples/basic/blinky :board: serpente :goals: build :compact:

#. Connect the Serpente to your host computer using USB

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

#. Flash the image:

.. zephyr-app-commands:: :zephyr-app: samples/basic/blinky :board: serpente :goals: flash :compact:

You should see the User LED blink.

References

.. target-notes::

.. _Serpente documentation: https://www.solder.party/docs/serpente/r2/

.. _pinouts: https://www.solder.party/docs/serpente/r2/pinout/

.. _schematic: https://www.solder.party/docs/serpente/r2/downloads/