How to display Serial.print

PlatformIO IDE
,
1

Hello,

I’m using platformio on wsl / vs code. I formerly used Arduino IDE.
”Build” and “upload” work fine with pio. But I don’t succeed to monitor what I display using Serial.print.

Here’s an extract of my platform.ini:

build_flags =
    -D ARDUINO_USB_CDC_ON_BOOT=1
    -D ARDUINO_USB_MODE=1
monitor_speed = 115200

and my main.cpp:

void setup() {
  Serial.begin(115200);
  delay(500);
  led.begin();
  led.setBrightness(50);
  led.clear();
  led.show();
}
void loop() {
  led.setPixelColor(0, led.Color(0, 0, 255));
  led.show();
  delay(500);
  led.clear();
  led.show();
  delay(500);
  Serial.print("It blinks!\n");
}

When I hit “Upload and monitor” (and then click on the reset button of the board), I get:

Hard resetting via RTS pin…
— Terminal on /dev/ttyACM0 | 115200 8-N-1
— Available filters and text transformations: debug, default, direct, esp32_exception_decoder, hexlify, log2file, nocontrol, printable, send_on_enter, time
— More details at Redirecting...
— Quit: Ctrl+C | Menu: Ctrl+T | Help: Ctrl+T followed by Ctrl+H
ESP-ROM:esp32s3-20210327
Build:Mar 27 2021
rst:0x1 (POWERON),boot:0x8 (SPI_FAST_FLASH_BOOT)
SPIWP:0xee
mode:DIO, clock div:1
load:0x3fce3808,len:0x4bc
load:0x403c9700,len:0xbd8
load:0x403cc700,len:0x2a0c
entry 0x403c98d0

I expected to find the “It blinks” text looping in the terminal of vs code?

Thanks for the help

2

Most ESP32S3 have two ports the serial output can come out of: The UART port (which is then connected to a USB-to-UART converter on the board) or the native USB port.

Which board you have exactly? If the board has two USB ports, which one do you use?

3

Thanks, my board is an esp32-s3-devkitc-1.

There are 2 usb c ports, one is called “COM” and the other one is called “USB”. I’m using “COM” to upload the firmware, which succeeds, I can see the led blink.

Now for debugging, I’d like to see the “Serial.print” as I did when using Arduino IDE. Thus I was trying the “upload and monitor” button.

image
image925×677 123 KB

4

This redirects it to the “USB” port not the “COM” port. Remove it.

5

Thanks a lot, it outputs “it blinks!”.