CODEWITHSUNDEEP
pythonserial-portbuffer
Richard
Richard

Reputation: 15862

Reading a Serial Port with Python. How does the buffers work?

I am just wondering how the buffers work on a com port.. The code below is a snip of how I am reading a com port. I am wondering if by doing serial_connection.close() and serial_connection.open() I would be losing any data, or would it remain in the buffer? You might ask why I am closing and opening the comport.. The reason being is that it is actually a virtual port and for what ever reason when I stay connected to it for a length of time data stops transmitting... 

import serial

serial_connection = serial.Serial(
        port = self.SERIAL_PORT,
        baudrate = self.BAUD_RATE,
        timeout = 10
        )

while true:

    serial_connection.close()
    serial_connection.open()
    line = serial_connection.readline()
    print line

Upvotes: 2

Views: 5024

Answers (1)

Gabe
Gabe

Reputation: 86718

PySerial has a separate thread that sits there listening for data to make sure that nothing gets lost. However, the OS itself does not buffer data. There is a slim chance that you could lose some data for the brief period of time between when you close the port and open it again.

Upvotes: 4

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