Seeed Studio Xiao ESP32C6

Caution

This page is automatically generated from RIOT doxygen documentation. If you find any issues or have suggestions for improvement, please report them on GitHub.

View API DocumentationView API documentation generated by Doxygen.

View on GitHubView this source code on GitHub.

Support for the Seeed Studio Xiao ESP32-C6 board

Related Boards

ESP32-C6 CommonDefinitions and configurations that are common for all ESP32-C6 boards.

Tip

When using this board with RIOT, set the BOARD variable to seeedstudio-xiao-esp32c6 in your Makefile. If you follow the standard RIOT project structure, your Makefile should look like this:

./Makefile

# name of your application
APPLICATION = hello-world

# Change this to your board if you want to build for a different board
BOARD ?= seeedstudio-xiao-esp32c6

# This has to be the absolute path to the RIOT base directory:
RIOTBASE ?= $(CURDIR)/RIOT

include $(RIOTBASE)/Makefile.include

Overview

Seeed Studio Xiao ESP32C6 is a small board based on the Espressif ESP32-C6 SoC, featuring two 32-bit RISC-V processors: a high-performance core running at up to 160 MHz and a low-power core clocked up to 20 MHz.

• Wi-Fi 6 2.4 GHz
• Bluetooth 5 (LE)
• IEEE 802.15.4 (Zigbee, Thread)
• Memory: 512KB of SRAM, and 4MB of Flash
• Size: 21 x 17.8mm
• Battery charging chip: Supports lithium battery charge and discharge management
• Ultra-Low Power: Deep sleep power consumption is about 15μA
• Battery charge indicator red LED
• RF switch for built-in or external antenna
• Working temperature: -40°C ~ 85°C

Hardware

MCU

Most features of the board are provided by the ESP32-C6 SoC. For detailed information about the ESP32-C6 variant (family) and ESP32x SoCs, see section ESP32 SoC Series.

Board Configuration

The Seeed Studio ESP32-C6 Xiao board has a reset button and a bootloader button, as well as a user LED on GPIO15. After reset, the bootloader button may be used by the application.

GPIO overview:

• 1 x UART
• 1 x LP_UART (not supported)
• 1 x I2C
• 1 x LP_I2C (not supported)
• 1 x SPI
• 11 x GPIO (only 3 PWM channels are defined by default)
• 7 x ADC (3 usable)
• 1 x SDIO (not supported)

The purpose for which a GPIO is used depends on which module or function is used first. For example, if the periph_spi module is not used, the GPIOs listed in SPI configuration can be used for other purposes.

The following table shows the default board configuration. This configuration can be overridden by application-specific configurations.

Function	Pin	Configuration
BUTTON0(Boot)	GPIO9	GPIO9 is a strapping pin
LED0	GPIO15	User LED (low active)
ADC/LP_GPIO	GPIO0, GPIO1, GPIO2	ADC Channels
PWM_DEV(0)	GPIO0, GPIO1, GPIO2	PWM Channels
I2C_DEV(0):SDA	GPIO22	I2C Interfaces
I2C_DEV(0):SCL	GPIO23	I2C Interfaces
SPI_DEV(0):SCK	GPIO19	SPI Interfaces
SPI_DEV(0):MISO	GPIO20	SPI Interfaces
SPI_DEV(0):MOSI	GPIO18	SPI Interfaces
SPI_DEV(0):CS0	GPIO21	SPI Interfaces
UART_DEV(0):TxD	GPIO16	UART interfaces
UART_DEV(0):RxD	GPIO17	UART interfaces

For detailed information about the peripheral configurations of ESP32-C6 boards, see section Common Peripherals.

RF Antenna Switch

The board has an RF switch to toggle between the built-in ceramic antenna and an external U.FL antenna. It is controlled by two GPIOs:

• GPIO3 (RF switch enable, active low) powers the switch.
• GPIO14 selects the antenna: low for the built-in ceramic antenna (default), high for the external U.FL antenna.

The built-in ceramic antenna is used by default, so no configuration is required for the common case. The board_init function configures the RF switch accordingly at startup.

To use the external U.FL antenna instead, enable the CONFIG_XIAO_ESP32C6_EXT_ANTENNA option, for example by adding the following line to the application’s Makefile:

CFLAGS += -DCONFIG_XIAO_ESP32C6_EXT_ANTENNA=1

Note

The external antenna path has not been tested due to a missing external antenna.

Battery Usage

The XIAO ESP32C6 series features a built-in power management chip, allowing it to be powered independently by a battery or to charge the battery through its USB port.

For connecting a battery to your XIAO, it’s recommend using a qualified rechargeable 3.7V lithium battery. When soldering the battery, carefully distinguish between the positive and negative terminals. The negative electrode pad should be located on the left side near the silk screen marking “D8”, while the positive electrode pad should be located on the right side near the silk screen marking “D5”.

Note

When the board is powered from the battery, no voltage is present on the 5V pin.

Note

The XIAO ESP32C6 has a red indicator light for battery charging, similar to the XIAO ESP32S3: The red light behavior for the XIAO ESP32C6 is as follows:

• When no battery is connected:
  • The red light turns on when the Type-C cable is connected and turns off after 30 seconds.
• When a battery is connected and the Type-C cable is plugged in for charging:
  • The red light flashes.
• When the battery is fully charged via the Type-C connection:
  • The red light turns off.

To monitor the battery voltage on the XIAO ESP32C6, similar to the XIAO ESP32C3, you’ll need to solder a 200k resistor in a 1:2 configuration. This setup reduces the voltage by half, allowing safe monitoring through the A0 analog port.

Sample Code can be found in The Seeed Wiki.

Deep Sleep and Wake-up

On the XIAO ESP32C6, only GPIO0, GPIO1 and GPIO2 of these RTC-capable pins are broken out and can therefore be used as wake-up sources.

Board Pinout

The following figure shows the pinout as configured by default board definition.

Board documentation

• Schematic (PDF)
• Pinout (XLSX)
• ESP32-C6 Datasheet (PDF)
• ESP32-C6 Technical Reference Manual (PDF)
• Product Page
• Wiki Page

Flashing the Device

The USB-C connector of the board is directly connected to the USB Serial/JTAG interface of the ESP32-C6 SoC. It can be used to program the board and to debug the application. Just connect the board to your host computer and use the following command:

make BOARD=seeedstudio-xiao-esp32c6 flash

---

Author: Stepan Konoplev