Data on Serial2, even though not initialized

[thomasklingbeil]

Hardware:

Board: DoIT ESP32
Core Installation/update date: 27/jun/2018 (a59eafb)
IDE name: Arduino IDE
Flash Frequency: 80Mhz
Upload Speed: 115200

Description:

For our application, we have used RX2 and TX2 on the DoIT ESP32 board (GPIO 16&17) for other purposes. This worked until recently, but not it seems, there is serial data being sent on those pins, even though I haven't initialized anything (i.e. I use an empty sketch).

I understand that there is the boot information on the first serial port, with which I am fine. But is there any way to prevent action on the other serial ports?

Sketch:

void setup() {
}

void loop() {
}

[jwd83]

I tried updating my arduino-esp32 yesterday and also had significant problems with the hardwareserial 2 not working under conditions like the USB being connected but would immediately start working when unplugged and running off battery power on the adafruit feather. Had to roll back to a much older version for my projects to work as expected again.

[thomasklingbeil]

I did another little test today. Connected two LEDs to RX2/TX2 (i.e. GPIO16/17) and 3.3V with the sketch below.

On the most recent version RX2 seems to stay HIGH and TX2 LOW (only during boot both seem to be high(ish)).

With an older version of arduino-esp32 everything works as I expected it to work.

void setup() {
  pinMode(16, OUTPUT);
  pinMode(17, OUTPUT);
}

void loop() {
  digitalWrite(16, HIGH);
  digitalWrite(17, LOW);

  delay(500);
  digitalWrite(16, LOW);
  digitalWrite(17, HIGH);

  delay(500);
  }

[me-no-dev]

hmm... I will look into this and see what IDF guys think of it

[thomasklingbeil]

Thank you! @me-no-dev: Is there anything I can do to support?

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[stale]

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