Tag Archives: embedded

Using ESP-IDF with RISC-V ESP32-C3 nodeMCU module on a Linux system

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<h2 id=Table of Content

* Introduction
* Step 1, install dependencies
* Step 2, install ESP-IDF
* Step 3, setup working environment
* Step 4, test “Hello World” example
* Step 5, tune the target, if needed
* Step 6, flash the project
* Step 7, viewing the output
* Troubleshooting
** Invalid value for ‘{esp32|esp32s2}’: ‘esp32c3′ is not one of ‘esp32′, ‘esp32s2′
** libsodium/crypto_box/curve25519xchacha20poly1305/box_seal_curve25519xchacha20poly1305.c
** Flashing errors
*** Detection, power, and device that disappear
*** usbfs: interface 0 claimed by ch341 while ‘brltty’ sets config #1
** Problem with CA certificates bundle


The list of existing ESP32-C3 SoC modules (with their specs) is very interesting, This one RISC-V core SoC has lower computing power than the ESP32-S3 (dual-core Xtensa ISA based, with a RISC-V co-processor core for “ultra low power” (ULP) mode), but RISC-V architecture is also far more efficient and will for sure have longer lifetime support and evolution due to its openness. ESP32-C3 use an RV32IMC (Integer, Multiplication/division and Compressed extensions) core.

I bought for my test a ESP-C3-32S-Kit on AliExpress (for ~3.4€). There is also an interesting option, where you can use really tiny 3~4 € ESP-C3-01M-Kit programmer interface/mother board, with a SoC included alone on a daughter (ESP32-C3M with an on PCB antenna). This allows, to flash several pads one only one programmer board. This reduce size of the needed system for final application to just the SoC and it’s power supply and peripherals. Pads of the SoC daughter board are wide enough to be easily soldered.

ESP-IDF is a tool to develop in C language on Espressif platforms, including ESP8266 and ESP32 series. It uses FreeRTOS free and open source embedded real-time OS for its SoCs. Sadly the official documentation for installing it is incomplete with the current state (November 2021) of GIT repository. Here is the mean to install a working ESP-IDF for this SoC series on Linux. This will be more compact and straight forward that the official with Linux+Windows installation.

About RISC-V more generally, I created this week a list of available Open Source RISC-V implementations, and open sources tools to build them or work with them. Continue reading