ESP32-C3-DevKit-RUST

Overview

ESP32-C3-DevKit-RUST is based on the ESP32-C3, a single-core Wi-Fi and Bluetooth 5 (LE) microcontroller SoC, based on the open-source RISC-V architecture. This special board also includes the ESP32-C3-MINI-1 module, a 6DoF IMU, a temperature and humidity sensor, a Li-Ion battery charger, and a Type-C USB. The board is designed to be easily used in training sessions, demonstrating its capabilities with all the board peripherals. For more information, check ESP32-C3-DevKit-RUST [1].

Hardware

SoC Features:

  • IEEE 802.11 b/g/n-compliant

  • Bluetooth 5, Bluetooth mesh

  • 32-bit RISC-V single-core processor, up to 160MHz

  • 384 KB ROM

  • 400 KB SRAM (16 KB for cache)

  • 8 KB SRAM in RTC

  • 22 x programmable GPIOs

  • 3 x SPI

  • 2 x UART

  • 1 x I2C

  • 1 x I2S

  • 2 x 54-bit general-purpose timers

  • 3 x watchdog timers

  • 1 x 52-bit system timer

  • Remote Control Peripheral (RMT)

  • LED PWM controller (LEDC)

  • Full-speed USB Serial/JTAG controller

  • General DMA controller (GDMA)

  • 1 x TWAI®

  • 2 x 12-bit SAR ADCs, up to 6 channels

  • 1 x temperature sensor

For more information, check the datasheet at ESP32-C3 Datasheet [2] or the technical reference manual at ESP32-C3 Technical Reference Manual [3].

Supported Features

The esp32c3_rust 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.
esp32c3_rust
/
esp32c3

Type

Location

Description

Compatible

CPU

on-chip

Espressif RISC-V CPU1

espressif,riscv

ADC

on-chip

ESP32 ADC1

espressif,esp32-adc

Bluetooth

on-chip

Bluetooth HCI for Espressif ESP321

espressif,esp32-bt-hci

CAN

on-chip

ESP32 Two-Wire Automotive Interface (TWAI)1

espressif,esp32-twai

Clock control

on-chip

ESP32 RTC (Power & Clock Controller Module) Module1

espressif,esp32-rtc

Counter

on-chip

ESP32 Counter Driver based on RTC Main Timer1

espressif,esp32-rtc-timer

on-chip

ESP32 general-purpose timers2

espressif,esp32-timer

DMA

on-chip

ESP32 GDMA (General Direct Memory Access)1

espressif,esp32-gdma

Flash controller

on-chip

ESP32 flash controller1

espressif,esp32-flash-controller

GPIO & Headers

on-chip

ESP32 GPIO controller1

espressif,esp32-gpio

I2C

on-chip

ESP32 I2C1

espressif,esp32-i2c

I2S

on-chip

ESP32 I2S1

espressif,esp32-i2s

Input

on-board

Group of GPIO-bound input keys1

gpio-keys

Interrupt controller

on-chip

ESP32 Interrupt controller1

espressif,esp32-intc

LED

on-board

Group of GPIO-controlled LEDs1

gpio-leds

LED strip

on-board

Worldsemi WS2812 LED strip, SPI binding1

worldsemi,ws2812-spi

MTD

on-chip

Flash node1

soc-nv-flash

on-chip

Fixed partitions of a flash (or other non-volatile storage) memory1

fixed-partitions

Pin control

on-chip

ESP32 pin controller1

espressif,esp32-pinctrl

PWM

on-chip

ESP32 LED Control (LEDC)1

espressif,esp32-ledc

RNG

on-chip

ESP32 TRNG (True Random Number Generator)1

espressif,esp32-trng

Sensors

on-board

Sensirion SHTCx humidity and temperature sensor1

sensirion,shtcx

on-chip

ESP32 temperature sensor1

espressif,esp32-temp

Serial controller

on-chip

ESP32 UART2

espressif,esp32-uart

on-chip

ESP32 UART1

espressif,esp32-usb-serial

SPI

on-chip

ESP32 SPI1

espressif,esp32-spi

Timer

on-chip

ESP32 System Timer1

espressif,esp32-systimer

Watchdog

on-chip

ESP32 XT Watchdog Timer1

espressif,esp32-xt-wdt

on-chip

ESP32 watchdog1 1

espressif,esp32-watchdog

Wi-Fi

on-chip

ESP32 SoC Wi-Fi1

espressif,esp32-wifi

I2C Peripherals

This board includes the following peripherals over the I2C bus:

Peripheral

Part number

Address

IMU

ICM-42670-P

0x68

Temperature and Humidity

SHTC3

0x70

I2C Bus Connection

Signal

GPIO

SDA

GPIO10

SCL

GPIO8

I/Os

The following devices are connected through GPIO:

I/O Devices

GPIO

WS2812 LED

GPIO2

LED

GPIO7

Button/Boot

GPIO9

Power

  • USB type-C (no PD compatibility).

  • Li-Ion battery charger.

System requirements

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

Simple boot

The board could be loaded using the single binary image, without 2nd stage bootloader. It is the default option when building the application without additional configuration.

Note

Simple boot does not provide any security features nor OTA updates.

MCUboot bootloader

User may choose to use MCUboot bootloader instead. In that case the bootloader must be built (and flashed) at least once.

There are two options to be used when building an application:

  1. Sysbuild

  2. Manual build

Note

User can select the MCUboot bootloader by adding the following line to the board default configuration file.

CONFIG_BOOTLOADER_MCUBOOT=y

Sysbuild

The sysbuild makes possible to build and flash all necessary images needed to bootstrap the board with the ESP32 SoC.

To build the sample application using sysbuild use the command:

west build -b esp32c3_rust --sysbuild samples/hello_world

By default, the ESP32 sysbuild creates bootloader (MCUboot) and application images. But it can be configured to create other kind of images.

Build directory structure created by sysbuild is different from traditional Zephyr build. Output is structured by the domain subdirectories:

build/
├── hello_world
│   └── zephyr
│       ├── zephyr.elf
│       └── zephyr.bin
├── mcuboot
│    └── zephyr
│       ├── zephyr.elf
│       └── zephyr.bin
└── domains.yaml

Note

With --sysbuild option the bootloader will be re-build and re-flash every time the pristine build is used.

For more information about the system build please read the Sysbuild (System build) documentation.

Manual build

During the development cycle, it is intended to build & flash as quickly possible. For that reason, images can be built one at a time using traditional build.

The instructions following are relevant for both manual build and sysbuild. The only difference is the structure of the build directory.

Note

Remember that bootloader (MCUboot) needs to be flash at least once.

Build and flash applications as usual (see Building an Application and Run an Application for more details).

# From the root of the zephyr repository
west build -b esp32c3_rust samples/hello_world

The usual flash target will work with the esp32c3_rust board configuration. Here is an example for the Hello World application.

# From the root of the zephyr repository
west build -b esp32c3_rust samples/hello_world
west flash

Open the serial monitor using the following command:

west espressif monitor

After the board has automatically reset and booted, you should see the following message in the monitor:

***** Booting Zephyr OS vx.x.x-xxx-gxxxxxxxxxxxx *****
Hello World! esp32c3_rust

Debugging

As with much custom hardware, the ESP32-C3 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 [4].

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 esp32c3_rust 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 esp32c3_rust samples/hello_world
west debug

References