CODEWITHSUNDEEP
pythonserial-portpyserial
Amadeus
Amadeus

Reputation: 352

(ValueError) Serial port response reading with python

I am trying to read response of the serial port. (I am using a RFID module) Here is my code:

import serial
ser = serial.Serial()
ser.port = "/dev/ttyUSB0"
ser.baudrate = 9600
ser.timeout = 3
ser.open()
if ser.isOpen():
    ser.write("\xFF\x01\x03\x10\x02\x02\x18")
    print("command written")
while ser.isOpen():
    response = ser.read(5)
    print("trying to read")
    print(int(response,16))

At first I used directly print(response) and what I got was:

trying to read
�#��

Therefore I used print(int(response,16)) in order to convert response to integer and now I am getting error:

Traceback (most recent call last):
  File "serialread.py", line 13, in <module>
    print(int(response,16))
ValueError: invalid literal for int() with base 16: '\x94#\xdb\xff'

What should I do? I am pretty new to python and do not have any idea what the problem can be.

Upvotes: 0

Views: 2476

Answers (1)

Burhan Khalid
Burhan Khalid

Reputation: 174614

Your string is already a hex literal:

>>> x = '\x94#\xdb\xff'
>>> x.encode('hex')
'9423dbff'
>>> int(x.encode('hex'),16)
2485378047L

Upvotes: 1

Related Questions