Raspberry PI PICO - serial error

Using Arduino Programming Questions
1

Hi,
I have a problem with starting communication between the Raspberry Pi Pico and the Serial Monitor in Arduino 1.8.13.

My settings:

  • official board R Pi Pico
  • Arduino Mbed OS RP 2040 Board v3.0.1 installed

I can program the board without problems: the blink example, SPI display is working.

But I have a problem communicating with Serial Monitor in Arduino.
I'm uploading an example:

void setup() {
Serial.begin(9600);
}
void loop() {
  Serial.write("Hello world!");
  delay(1000);
}

I also tried with:
Serial1.begin(9600);
Serial1.write("Hello world!");

and i have an error opening COM port communication:

processing.app.SerialException: Błąd otwarcia portu szeregowego 'COM6'.
	at processing.app.Serial.<init>(Serial.java:152)
	at processing.app.Serial.<init>(Serial.java:82)
	at processing.app.SerialMonitor$2.<init>(SerialMonitor.java:132)
	at processing.app.SerialMonitor.open(SerialMonitor.java:132)
	at processing.app.AbstractMonitor.resume(AbstractMonitor.java:132)
	at processing.app.Editor.resumeOrCloseSerialMonitor(Editor.java:2120)
	at processing.app.Editor.access$1300(Editor.java:117)
	at processing.app.Editor$UploadHandler.run(Editor.java:2089)
	at java.lang.Thread.run(Thread.java:748)
Caused by: jssc.SerialPortException: Port name - COM6; Method name - openPort(); Exception type - Port not found.
	at jssc.SerialPort.openPort(SerialPort.java:167)
	at processing.app.Serial.<init>(Serial.java:141)
	... 8 more
Błąd otwarcia portu szeregowego 'COM6'.
2

it is failed to open COM6
is COM6 the correct port? is it already in used by another program?
run the device manager to check what COM ports are working

3

yes, when I connect the board in device manager the COM6 port shows.
I tried to reset windows (W10) and run only arduino - no effect

4

I connected the PICO through the external USB-UART FTDI and it works.
Does not work if I connect PICO directly through USB to PC

5

I tried on another computer and it works...
I reinstalled the arduino, added the raspberry board again and it started working.

6

what gpio pinout is using for serial tx/rx?

7

he connected via usb, not using the gpios

8

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