Simple Logic For Connecting Pico Pi Serial Port to Computer

You need three file: On your pi, boot.py (Note you have reboot the pi to run this) This turns on the data serial port

import storage
import usb_cdc

usb_cdc.disable()   # Disable both serial devices.

usb_cdc.enable(console=True, data=True)

On your pi. This runs the code and has it send text to the serial port

# usb_io for  Raspberry Pi Pico with rp2040

import supervisor
import usb_cdc
import time

while not supervisor.runtime.usb_connected:
    pass

ser = usb_cdc.data

def usb_writeline (usb_data_port, x):
    print (str(x))
    usb_data_port.write(bytes(str(x) + "\n", "utf-8"))
    usb_data_port.flush()

while True:
    usb_writeline(ser, 'Grahammers')

On your laptop

This code reads the serial port

# usb_io.py

import serial
import adafruit_board_toolkit.circuitpython_serial
import select

ser      = serial.Serial( None, 115200, 8, "N", 1, timeout=120)
ser.port = "COM5"

ser.open()

s = ser.readline()
print(s)