CODEWITHSUNDEEP
pythonfunctionserial-port
Ahmed Al-haddad
Ahmed Al-haddad

Reputation: 833

Python - Function is not being executed

I have this program that defines a function and then calls it, but no matter what I do, the program doesn't execute the function's call. Am I missing something? I already checked with the other questions but I couldn't find anything similar to what I am facing.

baudrate = 115200
port = '/dev/ttyUSB2' 
def serial_data(ser):
    print ser.name # it doesn't print here at all! 
    sys.stdout.flush()
    while True:
        yield ser.readline()
    ser.close()

    for line in serial_data('/dev/ttyUSB2', 115200):
        print "data : " 
        print line
    data = []
ser = serial.Serial(port, baudrate)
serial_data(ser)

The output for this program is 

#nothing, it just hangs.

If I remove the infinite loop, the program terminates immediately.

Upvotes: 0

Views: 56

Answers (1)

dvlahovski
dvlahovski

Reputation: 46

From: https://pythonhosted.org/pyserial/shortintro.html#readline (I believe this is the lib you're using)

Be carefully when using readline(). Do specify a timeout when opening the serial port otherwise it could block forever if no newline character is received.

Also nothing after ser.close() (including) in the serial_data function will be executed because of the yielding from the infinite loop.

Edit Try this:

baudrate = 115200
port = '/dev/ttyUSB2' 
ser = serial.Serial(port, baudrate, timeout=5)
print(ser.name)
print(ser.readline())
ser.close()

Upvotes: 1

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