Arduino Nano 33 BLE (nRF52840) digital state setting for TX pin not working

Other Hardware 3rd Party Boards
1

Hi,

I can't set the state of the TX (0) pin to LOW.

Board pinout. I'm using the framework-arduino-nrf52-mbedos:1.3.0 for this board.

#include <Arduino.h>
#include <ArduinoBLE.h>
#include <Arduino_LSM9DS1.h>


#define SERIALDEBUG Serial //Serial USB for monitor
#define SERIALDEVICE Serial1 //Hardware serial
#define SERIALTXPIN 0
#define SERIALRXPIN 1
#define BOARD_LED 13

void setup()
{
    SERIALDEVICE.end();
    delay(350);

    pinMode(SERIALTXPIN, OUTPUT);
    digitalWrite(SERIALTXPIN, LOW);
    delay(5000);
    digitalWrite(SERIALTXPIN, HIGH);
    delay(5000);
}

void loop()
{
    // Switch state every 10 seconds
    digitalWrite(SERIALTXPIN, LOW);
    digitalWrite(BOARD_LED, LOW);
    delay(10000);
    digitalWrite(SERIALTXPIN, HIGH);
    digitalWrite(BOARD_LED, HIGH);
    delay(10000);
}

This doesn't seem to work. The voltage on the TX pin is always 3.25V.

I tried to look into pins_arduino.h and pinmode_arduino.h but nothings seems to help me.

What could cause this? Can the RX and TX pins be set to digital output on this board?

2

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