XIAO ESP32C3

Overview

Seeed Studio XIAO ESP32C3 is an IoT mini development board based on the Espressif ESP32-C3 WiFi/Bluetooth dual-mode chip.

For more details see the Seeed Studio XIAO ESP32C3 [1] wiki page.

Hardware

This board is based on the ESP32-C3 with 4MB of flash, WiFi and BLE support. It has an USB-C port for programming and debugging, integrated battery charging and an U.FL external antenna connector. It is based on a standard XIAO 14 pin pinout.

Supported Features

The XIAO ESP32C3 board configuration supports the following hardware features:

Interface	Controller	Driver/Component
PMP	on-chip	arch/riscv
INTMTRX	on-chip	intc_esp32c3
PINMUX	on-chip	pinctrl_esp32
USB UART	on-chip	serial_esp32_usb
GPIO	on-chip	gpio_esp32
UART	on-chip	uart_esp32
I2C	on-chip	i2c_esp32
SPI	on-chip	spi_esp32_spim
TWAI	on-chip	can_esp32_twai

Connections and IOs

The board uses a standard XIAO pinout, the default pin mapping is the following:

Prerequisites

Espressif HAL requires WiFi and Bluetooth binary blobs in order work. Run the command below to retrieve those files.

west blobs fetch hal_espressif

Note

It is recommended running the command above after west update.

Building & Flashing

For the Hello, world! application, follow the instructions below.

# From the root of the zephyr repository
west build -b xiao_esp32c3 samples/hello_world
west flash

Since the Zephyr console is by default on the usb_serial device, we use the espressif monitor to view.

$ west espressif monitor

Debugging

As with much custom hardware, the ESP32 modules require patches to OpenOCD that are not upstreamed yet. Espressif maintains their own fork of the project. The custom OpenOCD can be obtained at OpenOCD ESP32 [2]

The Zephyr SDK uses a bundled version of OpenOCD by default. You can overwrite that behavior by adding the -DOPENOCD=<path/to/bin/openocd> -DOPENOCD_DEFAULT_PATH=<path/to/openocd/share/openocd/scripts> parameter when building.

Here is an example for building the Hello World application.

# From the root of the zephyr repository
west build -b xiao_esp32c3 samples/hello_world -- -DOPENOCD=<path/to/bin/openocd> -DOPENOCD_DEFAULT_PATH=<path/to/openocd/share/openocd/scripts>
west flash

You can debug an application in the usual way. Here is an example for the Hello World application.

# From the root of the zephyr repository
west build -b xiao_esp32c3 samples/hello_world
west debug