WeAct Esp32-C3 Core Serial Monitor doesn't work

PlatformIO IDE
1

I’m trying to get the serial monitor to work with the WeAct Esp32-C3 Core but i don’t get any output.

This is the sketch:

#include <Arduino.h>

void setup() {
    Serial.begin(115200);
    pinMode(8, OUTPUT);
}

void loop() {
    Serial.println("test");

    digitalWrite(8, HIGH);
    delay(1000);
    digitalWrite(8, LOW);
    delay(1000);
}

and platformio.ini:

[env:esp32doit-devkit-v1]
platform = espressif32
board = esp32-c3-devkitm-1
framework = arduino
build_unflags = -std=gnu++11
build_flags = 
    -std=gnu++17
monitor_speed = 115200

The led blinks, but there is no output on the serial monitor.

adding

monitor_rts = 0
monitor_dtr = 0

prints this to the serial monitor:

Saved PC:0x420140fa
SPIWP:0xee
mode:DIO, clock div:1
load:0x3fcd5810,len:0x438
load:0x403cc710,len:0x90c
load:0x403ce710,len:0x2624
entry 0x403cc710

but nothing else and adding:

-D ARDUINO_USB_MODE=1
-D ARDUINO_USB_CDC_ON_BOOT=1

does nothing.

I found this thread: ESP-IDF monitor READ only WeAct Studio board [SOLVED] - Golioth Device Help - Golioth Forums

but i can’t set the menuconfig when using the arduino framework because it uses a precompiled version of esp-idf

Any ideas?

2

ARDUINO_CDC_ON_BOOT must be set to 0 to use the UART interface.
See ESP32-S3 native USB interface and Serial Monitor missing first messages - #10 by sivar2311

Otherwise you have to use Serial0 object.

3

Still not printing anything

4

Does your board have a USB to SERIAL chip on it?

5

Why does the board need a USB to SERIAL chip? Doesn’t the esp32c3 do that?

This is the repo for the board:

under ESP-IDF Use precautions they write:

Software engineering needs to set UART printing to USB Serial/Debug
6

Ok, then it was a misunderstanding on my side.

To use the builtin USB CDC

-DARDUINO_USB_MODE=1
-DARDUINO_USB_CDC_ON_BOOT=1

is correct.

If you hover over Serial you should see “HWCDC Serial”:

image

7

Yes, it says that. ⠀ ⠀

8

It now works with

-DARDUINO_USB_MODE=1
-DARDUINO_USB_CDC_ON_BOOT=1

and I don’t know why. Maybe I didn’t restart the serial monitor even once while testing with only these two flags?

9

These flags have no influence on the PlatformIO serial monitor.
They control the build process and define which class is used for the Serial object: HardwareSerial, USBCDC, HWCDC.