CODEWITHSUNDEEP
pythonserial-portpyserial
ferryard
ferryard

Reputation: 135

Waiting for incoming serial communication data Python

I am trying to make a program which run serial communication with another program in python. In my program, I want to wait a specific incoming data. So far, I have successfully done it with this command :

while ser.read(length)!= incoming_data:
    pass

But the incoming_data has various possibility. I want to check what data is coming and do a specific task for each incoming data. In tera term macro I can use this code:

wait data1 data2
if result = 1 then .....
if result = 2 then ....

How can I do the same thing in python serial? because each data has different length. Thanks in advance.

Upvotes: 0

Views: 3596

Answers (2)

Peter Gibson
Peter Gibson

Reputation: 19554

You could buffer the incoming data and then check for matches. Something like

buf = ''
while 1:
    buf += ser.read(1)
    if buf == data1:
        # do stuff
        buf = ''
    elif buf == data2:
        # do something else
        buf = ''

Upvotes: 0

three_pineapples
three_pineapples

Reputation: 11849

In my experience you need a terminating character of some kind to indicate the end of the message. Typically the newline character is used (\n). pyserial has a method readline() which will read until it reaches a newline character and then return that data.

Upvotes: 1

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