ESP32-C3-DevKit Board

Support for generic ESP32-C3 boards. More...

Detailed Description

Support for generic ESP32-C3 boards.

Author

Gunar Schorcht gunar.nosp@m.@sch.nosp@m.orcht.nosp@m..net

ESP32-C3-DevKit

Table of Contents

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

Overview

The Espressif ESP32-C3-DevKit boards are a couple of boards that use one of the following modules:

• ESP32-C3-MINI-1x module (ESP32-C3-DevKitM-1 board)
• ESP32-C3-WROOM-02x module (ESP32-C3-DevKitC-02 board)

Since the number of GPIOs and their possible uses on the ESP32-C3 are quite limited, the ESP32-C3-DevKit should also work for most other ESP32-C3 boards. Any modifications required for specific applications could be overridden by application-specific board configuration.

Espressif ESP32-C3-DevKitM-1

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Hardware

This section describes

• the MCU,
• the default board configuration,
• optional hardware configurations,
• 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

ESP32-C3-DevKit boards have no special hardware on board with the exception of a single pin RGB-LED.

All GPIOs are simply broken out for flexibility. Therefore, the board configuration is the most flexible one which provides:

• 6 x ADC channels at maximum
• 1 x SPI
• 1 x I2C
• 2 x UART
• 1 RGB-LED

Since all GPIOs have broken out, GPIOs can be used for different purposes in different applications. For flexibility, GPIOs can be listed in multiple peripheral configurations, but they can only be used for one peripheral at a time. For example, GPIO4 is used in the ADC channel definition, the PWM channel definition and the definition of the SCL signal for I2C_DEV(0).

This is possible because GPIOs are only used for a specific peripheral interface when either

• the corresponding peripheral module is used, e.g. periph_i2c and periph_spi, or
• the corresponding init function is called, e.g. adc_init and pwm_init.

That is, the purpose for which a GPIO is used depends on which module or function is used first.

For example, if module periph_i2c is not used, the GPIOs listed in I2C configuration can be used for the other purposes, that is, GPIO4 can be used as ADC channel or PWM channel.

The following table shows the default board configuration, which is sorted according to the defined functionality of GPIOs. This configuration can be overridden by application-specific configurations.

Function	GPIOs	Remarks	Configuration
BUTTON0	GPIO9
ADC	GPIO0, GPIO1, GPIO2, GPIO3, GPIO4, GPIO5		see ADC Channels
PWM_DEV(0)	GPIO3, GPIO4	-	PWM Channels
I2C_DEV(0):SCL	GPIO4		I2C Interfaces
I2C_DEV(0):SDA	GPIO5		I2C Interfaces
RGB-LED	GPIO8	supported by driver module ws281x
SPI_DEV(0):CLK	GPIO6	SPI2_HOST (FSPI) is used	SPI Interfaces
SPI_DEV(0):MISO	GPIO2	SPI2_HOST (FSPI) is used	SPI Interfaces
SPI_DEV(0):MOSI	GPIO7	SPI2_HOST (FSPI) is used	SPI Interfaces
SPI_DEV(0):CS0	GPIO10	SPI2_HOST (FSPI) is used	SPI Interfaces
UART_DEV(0):TxD	GPIO21	Console (configuration is fixed)	UART interfaces
UART_DEV(0):RxD	GPIO20	Console (configuration is fixed)	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.

EPS32-C3-DevKitM-1x Pinout

EPS32-C3-DevKitC-02x Pinout

The corresponding board schematics can be found:

• ESP32-C3-DevKitM-1
• ESP32-C3-DevKitC-02

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Flashing the Device

Flashing RIOT is quite easy. The board has a Micro-USB connector with reset/boot/flash logic. Just connect the board to your host computer and type using the programming port:

make flash BOARD=esp32c3-devkit ...

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 ESP32-C3-DevKit boards.
file	gpio_params.h
	Board specific configuration of direct mapped GPIOs.
file	periph_conf.h
	Peripheral configurations for ESP32-C3-DevKit boards.