Seeed Studio Xiao ESP32C3

Support for the Seeed Studio Xiao ESP32-C3 board. More...

Detailed Description

Support for the Seeed Studio Xiao ESP32-C3 board.

Author

David Picard

Seeed Studio Xiao ESP32C3

Table of Contents

1. Overview
2. Hardware
   1. MCU
   2. Board Configuration
   3. Board Pinout
   4. Board documentation
3. Flashing the Device

Overview

Seeed Studio Xiao ESP32C3 is an IoT mini development board based on the Espressif ESP32-C3 WiFi/Bluetooth dual-mode chip, featuring a single ­core 32-bit RISC-V CPU that operates at up to 160 MHz.

• Wi-Fi
• Bluetooth
• Battery charging chip: Supports lithium battery charge and discharge management
• Memory: 400KB of SRAM, and 4MB of on-board flash memory
• Small size: 21 x 17.8mm
• Ultra-Low Power: Deep sleep power consumption is about 43μA
• Battery charge indicator red LED

Seeed Studio EPS32-C3 Xiao

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Hardware

This section describes

• the MCU,
• the default board configuration,
• the board pinout.

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MCU

Most features of the board are provided by the ESP32-C3 SoC. For detailed information about the ESP32-C3 variant (family) and ESP32x SoCs, see section ESP32 SoC Series.

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Board Configuration

The Seeed Studio EPS32-C3 Xiao board has a reset button and a bootloader button, but no LED. After reset, the bootloader button may be used by the application.

To select the board, add the following to the make command line:

BOARD=seeedstudio-xiao-esp32c3 make ...

GPIO overview:

• 3 x ADC channels at maximum
• 1 x SPI
• 1 x I2C
• 1 x UART
• 11 x PWM channels (only 4 defined by default)

The purpose for which a GPIO is used depends on which module or function is used first. For example, if module periph_spi 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	GPIO9	GPIO9 is a strapping pin
ADC	GPIO2, GPIO3, GPIO4	ADC Channels
I2C_DEV(0):SCL	GPIO7	I2C Interfaces
I2C_DEV(0):SDA	GPIO6	I2C Interfaces
PWM_DEV(0)	GPIO2, GPIO3, GPIO4, GPIO5	PWM Channels
SPI_DEV(0):SCK	GPIO8	SPI Interfaces
SPI_DEV(0):MISO	GPIO9	SPI Interfaces
SPI_DEV(0):MOSI	GPIO10	SPI Interfaces
SPI_DEV(0):CS0	GPIO5	SPI Interfaces
UART_DEV(0):TxD	GPIO21	UART interfaces
UART_DEV(0):RxD	GPIO20	UART interfaces

Note

The configuration of ADC channels contains all ESP32-C3 GPIOs that could be used as ADC channels.

For detailed information about the peripheral configurations of ESP32-C3 boards, see section Common Peripherals.

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Board Pinout

The following figures show the pinouts as configured by default board definition.

Seeed Studio EPS32-C3 Xiao Pinout

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Board documentation

• schematic (PDF)
• pinout (XLSX)
• ESP32-C3 datasheet (PDF)
• ESP32-C3 Technical Reference Manual (PDF)
• power consumption report (PDF)
• product page
• wiki page

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Flashing the Device

The USB-C connector of the board is directly connected to the USB Serial/JTAG interface of the ESP32-C3 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 flash BOARD=seeedstudio-xiao-esp32c3 ...

The make utility will normally restart the board in download mode in order to flash it. But, on occasion, this reset doesn't work. The programmer can't connect to the board and the flashing operation is aborted with a timeout error:

Serial port /dev/ttyACM0
Connecting...
...
serial.serialutil.SerialTimeoutException: Write timeout

In this situation, restart the board manually in download mode:

1. hold down the BOOT button
2. press and release the RESET button
3. release the BOOT button.

After flashing the board, it will still be in download mode. You have to press the RESET button to start your application.

For detailed information about ESP32-C3 as well as configuring and compiling RIOT for ESP32-C3 boards, see RIOT-OS on ESP32 SoC Series Boards.

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Files
file	arduino_iomap.h
	Mapping from MCU pins to Arduino pins.
file	board.h
	Board definitions for the Seeed Studio Xiao ESP32-C3 board.
file	gpio_params.h
	Board specific configuration of direct mapped GPIOs.
file	periph_conf.h
	Peripheral configurations for the Seeed Studio ESP32-C3 Xiao board.