ESP32S3 - Serial Monitor println() non-display issue in VScode

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1

MY BOARD: YD-ESP32-S3-N8R2 (a devkitc-1 variant)

MY SETUP: Mac M1, VScode, pIO, Arduino framework

391602707_7114134868610280_2818828725613149370_n
391602707_7114134868610280_2818828725613149370_n1080×1920 373 KB

I’m plugged in on the com port marked “USB” on the left of this board.

THE PROBLEM:

  • The LED flashes as per the code. If I put a blink into the loop also, it blinks as expected.
  • Nothing on the serial monitor shows despite the println commands.

MY INI FILE

[env:esp32-s3-devkitc-1]
platform = espressif32
board = esp32-s3-devkitc-1
framework = arduino
monitor_speed = 115200
upload_port = /dev/cu.usbmodem1101

;; SEE: https://community.platformio.org/t/solved-esp32-serial-monitor-not-working/2858/
monitor_rts = 0 
monitor_dtr = 0

build_type = debug

MY MAIN.CPP

#include <Arduino.h>

#define BAUD_RATE 115200
#define LED 45

void setup()
{
  Serial.begin(BAUD_RATE);

  pinMode(LED, OUTPUT); 
  /// flash LED
  for (int i=3;i>=0;i--){
    digitalWrite(LED, HIGH);
    delay(1000);
    digitalWrite(LED, LOW);
    delay(1000);
  }

  Serial.println("Hello!");
  delay(500);
}

void loop()
{
  Serial.println("LEMONS");
  delay(2000);
}

THE RESULT

 *  Executing task: platformio device monitor --port /dev/cu.usbmodem1101 

--- forcing DTR inactive
--- forcing RTS inactive
--- Terminal on /dev/cu.usbmodem1101 | 115200 8-N-1
--- Available filters and text transformations: colorize, debug, default, direct, esp32_exception_decoder, hexlify, log2file, nocontrol, printable, send_on_enter, time
--- More details at https://bit.ly/pio-monitor-filters
--- Quit: Ctrl+C | Menu: Ctrl+T | Help: Ctrl+T followed by Ctrl+H
ESP-ROM:esp32s3-20210327
Build:Mar 27 2021
rst:0x15 (USB_UART_CHIP_RESET),boot:0x8 (SPI_FAST_FLASH_BOOT)
Saved PC:0x420233d6
SPIWP:0xee
mode:DIO, clock div:1
load:0x3fce3808,len:0x44c
load:0x403c9700,len:0xbe4
load:0x403cc700,len:0x2a68
entry 0x403c98d4

(I then do an info-check)
--- Settings: /dev/cu.usbmodem1101  115200,8,N,1
--- RTS: inactive  DTR: inactive  BREAK: inactive
--- CTS: inactive  DSR: inactive  RI: inactive  CD: inactive
--- software flow control: inactive
--- hardware flow control: inactive
--- serial input encoding: UTF-8
--- serial output encoding: UTF-8
--- EOL: CRLF
--- filters: send_on_enter esp32_exception_decoder

Thank you for your time reading this and any assistance you can give. I’m stuck trying to get this board off the ground.

2

Well, there are two USB ports. One will be the native USB connection to the ESP32S3 chip, the other one will be to the USB-UART converter of the board, which is also in-turn connected to the UART of the ESP32-S3. I’m sure if there’s nothing on “USB” there will be output on the “COM” labeled port.

Note it is a changable compile-time config where Serial.println() logs to (native USB or UART). With

you have the standard settings

And since there is no

in it, it will by-default log via UART. You would have to add

build_flags =
   -DARDUINO_USB_CDC_ON_BOOT=1

to the platformio.ini make it log via the USB CDC.

1 Like
3

The output now shows!
I am still very junior, and so did not know to look for something like this – thank you so much for your help & patience…

4

Hi, I have the same problem, but for me this doesn’t solve it.

[env:lilygo-t-display-s3]
platform = espressif32
board = lilygo-t-display-s3
framework = arduino
upload_protocol = esptool
monitor_port = COM4
upload_port = COM4
monitor_speed = 460800
;monitor_dtr = 0

build_type = debug
build_flags = -DARDUINO_USB_MODE=1 -DARDUINO_USB_CDC_ON_BOOT=1 -DCORE_DEBUG_LEVEL=5

Any other hints?