ESP32-C3 IDF example?

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1

After hours of unsuccessful tries, back to the basics:

I’m looking for examples for the ESP32-C3. The examples provided within the PIO explorer are only for ESP32, throwing the expected error A fatal error occurred: This chip is ESP32-C3 not ESP32. Wrong --chip argument? with the most basic example like esp-idf-blink while flashing. Trying out the examples from the original repo results in libraries not being found. This i figured out was due to missing config inside of sdkconfig.defaults which i found out can be edited with menuconfig. Still, if i get to compile these examples after much fiddling around, the ESP32-C3 immediately crashes and reboots. Uploading the exact same code with the eclipse IDE and the ESP-IDF installed works just fine. I still would like to transition to PIO.

Crash/boot log from serial terminal:

ESP-ROM:esp32c3-api1-20210207
Build:Feb  7 2021
rst:0x10 (RTCWDT_RTC_RST),boot:0xc (SPI_FAST_FLASH_BOOT)
SPIWP:0xee
mode:QIO, clock div:1
load:0x3fcd6100,len:0x17f4
ets_loader.c 78

platformio.ini:

[env:esp32-c3-devkitm-1]
platform = espressif32
board = esp32-c3-devkitm-1
framework = espidf

monitor_speed = 115200

Again in short: please provide me with a minimal working example for the ESP32-C3 with the ESP-IDF under PIO.

2

The default board = .. setting may be a standard ESP32, but that’s nothing that’s unchangable. What’s your platformio.ini?

Using examples from the master branch of ESP-IDF will surely get you these kinds of errors, since the latest platform-espressif32 version gives you ESP-IDF 4.4.3, not the develop or some 5.x version. It’s thus only appropriate to use the examples from the same version, 4.4.3 at the moment.

3

Added platformio.ini and the serial log to the original post. So you are saying that PIO is “ahead” of the IDF since it mentions versions above 4?

4

Looks okay. Can you use the exact same sample code as in https://github.com/platformio/platform-espressif32/tree/develop/examples/espidf-blink/src with an added

build_flags = -D CONFIG_BLINK_GPIO=2

(or wherever the built-in LED of the board is)?

You can also delete all *sdkconfig* files in the root of the project and rerun pio run -t menuconfig in the CLI to regenerate the defaults.

5

I took your advice regarding the versions and edited my platformio.ini's platform variable to an older version with platform = espressif32@4.4.0 and now it works, thank you for your help as always! I did not test your latest answer as it works with the mentioned editing of the version.

6

I am using pio again after a long break and finding previous work is broken. For example, ESP32-C3 was rebooting because of SHA-256. After a search, I set platform as did jake-esd-protected1. Now the C3 is working again.