from tkinter import *
import serial.tools.list_ports
import functools

ports = serial.tools.list_ports.comports()
serialObj = serial.Serial()

root = Tk()
root.config(bg='grey')

def initComPort(index):
    currentPort = str(ports[index])
    comPortVar = str(currentPort.split(' ')[0])
    serialObj.port = comPortVar
    serialObj.baudrate = 9600
    serialObj.open()

for onePort in ports:
    comButton = Button(root,text=onePort,font=('Calibri','13'),height=1, width=45,command=functools.partial(initComPort,index=ports.index(onePort)))
    comButton.grid(row=ports.index(onePort),column=0)

dataCanvas = Canvas(root,width=600,height=400, bg='white')
dataCanvas.grid(row=0, column=1,rowspan=100)
vsb = Scrollbar(root,orient='vertical',command= dataCanvas.yview)
vsb.grid(row=0,column=2,columnspan=100,sticky='ns')
dataCanvas.config(yscrollcommand=vsb.set)
dataFrame = Frame(dataCanvas,bg='white')
dataCanvas.create_window((10,0),window=dataFrame,anchor='nw')

def letsDoIt():
    serialObj.write(b'Ok there\n')

b1 = Button(root,text='Click me',command=letsDoIt)
b1.grid(row=0,column=3)

def checkSerialPort():
    if serialObj.isOpen() and serialObj.in_waiting:
        recentPacket = serialObj.readline()
        recentPacketString  = recentPacket.decode('utf').rstrip('\n')
        Label(dataFrame,text=recentPacketString).pack()

while True:
    root.update()
    checkSerialPort()
    dataCanvas.config(scrollregion=dataCanvas.bbox("all"))