ESP32-C6-Zero does not work on PlatformIO

10

As mentioned before, the ESP32-C6 requires at least Arduino 3.x!

So you have to use

platform = https://github.com/pioarduino/platform-espressif32/releases/download/stable/platform-espressif32.zip

When compiling, take a look at the PLATFORM output:

PLATFORM: Espressif 32 (53.3.12)

About your code: Is it just about blinking the onboard RGB LED or is it about driving a whole RGB stripe?

If it is just about one single RGB led you don’t need FastLED library for that.
Simply use the built-in function rgbLedWrite or rgbLedWriteOrdered

platformio.ini

[env:esp32-c6-devkitm-1]
platform = https://github.com/pioarduino/platform-espressif32/releases/download/53.03.12/platform-espressif32.zip 
board = esp32-c6-devkitm-1
framework = arduino

main.cpp

#include <Arduino.h>

const int RGB_LED = 8;

void setup() {
}

void loop() {
    rgbLedWrite(RGB_LED, 255,0,0);
    delay(500);
    rgbLedWrite(RGB_LED, 0,0,0);
    delay(500);
}