esp32-c3 (supporer mini) show monotor Serial (hold boot + power first for upload code)

platformio.ini

[env:esp32c3]
platform = espressif32
board = esp32-c3-devkitm-1
framework = arduino
monitor_speed = 115200
build_flags = 
  -DARDUINO_USB_CDC_ON_BOOT=1
  -DARDUINO_USB_MODE=1

src-main.cpp

#include <Arduino.h>

void setup() {
  Serial.begin(115200);
  delay(1000);

  Serial.println("Xin chào từ ESP32-C3!");
}

void loop() {
  Serial.println("In ra mỗi 2 giây");
  delay(2000);
}