No parity bit in Serial communication using PL011 uart

Question

I have little experience on UART communication. I am using the PL011 UART instead of mini mart in a Raspberry Pi 3, therefore I should have parity bit. The thing is when I enable the parity bit in my script the message is misunderstood. My question is, do I have parity bit on PL011 UART or I am doing something wrong? I hope that you will be able to help me.

Raspberry Pi code:

import serial, time

ser = serial.Serial(
    port="/dev/ttyAMA0",   
    baudrate=57600,        
    parity=serial.PARITY_ODD,          
    stopbits=serial.STOPBITS_ONE,      
    bytesize=serial.EIGHTBITS,
    xonxoff=True
    )

print ("START")
time.sleep(2)
while True:
    print(ser.read())

Output:

h
Y
?
?

?
K
?
d
h
Y
?
?

?
K
?
d
h
Y
?
?

?
K
?
d
h
Y
?
?

The message sent is:

hello world

The client's code: import serial, time

 ser = serial.Serial(
     port="/dev/cu.usbserial-AH01W3BD",
     baudrate=57600,
     parity=serial.PARITY_ODD,      
     stopbits=serial.STOPBITS_ONE,  
     bytesize=serial.EIGHTBITS,
     xonxoff=True
     )

print "START SENDING"

while True:
    time.sleep(2)
    ser.write("hello world")
    print("Outputting transmiter buffer: " + str(ser.out_waiting))
    print("Outputting reciver buffer: " + str(ser.in_waiting))

Client's OS: macOS High Sierra

Answer 1

You will most certainly have a parity bit available on any UART chip. Whether you use it or not is another question. The most common serial configuration is 8N1, which means no parity bit is used.

If you wish to communicate between two serial ports, they will both need to be configured the same. I would recommend you start with 8N1, and get that working before you try other configurations.