Arturo182 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

The serpente board supports the hardware features listed below.

on-chip / on-board
Feature integrated in the SoC / present on the board.
2 / 2
Number of instances that are enabled / disabled.
Click on the label to see the first instance of this feature in the board/SoC DTS files.
vnd,foo
Compatible string for the Devicetree binding matching the feature.
Click on the link to view the binding documentation.

Connections and IOs

The Serpente documentation [1] has detailed information about the board including pinouts [2] and the schematic [3].

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 USB sample applications for more, such as the USB CDC ACM UART sample sample which prints “Hello World!” to the host PC.

Programming and Debugging

The serpente board supports the runners and associated west commands listed below.

flash debug

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

Flashing

  1. Build the Zephyr kernel and the Blinky sample application:

    west build -b serpente samples/basic/blinky

  2. Connect the Serpente to your host computer using USB

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

  4. Flash the image:

    west build -b serpente samples/basic/blinky
west flash

    You should see the User LED blink.

References