Menu
Python serial port access library. Contribute to pyserial/pyserial development by creating an account on GitHub. Python serial port access library. Contribute to pyserial/pyserial development by creating an account on GitHub. Self.s = serial.serialforurl(PORT, timeout = 1) def tearDown (self): self.s.close def testreadline (self.
Active1 year, 3 months ago
I am trying to communicate between a pair of RPi's both with Ciseco XRF Radios on Slice of Pi's.
My end goal is for RPi1 to send a specific phrase to RPi2 which will pick it up, perform some actions(collecting data from some sensors) and send a response; I figured serialport.read/write is the best way to do this.
I'm working on the very basic stage of this which is simply RPi2 listening to the serial port and printing whatever it recieves. My code is as follows:
I can run this fine and it picks things up that I type/paste into RPi1 but not reliably; for example if I paste 'hello world' into the terminal on RPi1 I get:
appearing at RPi2. If I add a time delay (time.sleep(3) for example) I get nothing. My guess is that it is only picking up data if it is sent at the same time as it is reading.
Is there some way to reliably read everything that comes out of the serial port? (Maybe RPi2 store the input somewhere and read everything since its last read or something.)
KersakovKersakov
1 Answer
You should not re-create the object Serial at each iteration of the loop. I suppose that the line
serialport = serial.Serial('/dev/ttyAMA0', 9600, timeout=0.5) closes and re-opens the serial port, flushing all the buffers.
Try this :
JF002JF002
Not the answer you're looking for? Browse other questions tagged pythonserial or ask your own question.
Active3 years, 1 month ago
EDIT
I found out what the problem was and have answered my own question.
Original question below this line
I have a serial bridge between
COM4 and COM5 implemented in software (Specifically, HDD's Free Virtual Serial Configuration Utility)
I have two different python scripts starting up in two different instances of Powershell, receive first:
And then the sender:
When starting the sender script, the receiver script gets the sent message (So communication is clearly established) but the sender script immediately ends with an error:
I get the same error when I change the sender script to
So my question is: What exactly is timing out? How do I prevent that from happening? I mean, the data IS being sent so I could probably just put the whole thing in a
try/except(and do nothing) block but that seems like a bad solution in the long run.
medivh
medivh
![]()
56811 gold badge1010 silver badges2222 bronze badges
1 AnswerPython Serial Read Timeout
The clue is in the error message[1]
so we open that file and find:
Read that first conditional again:
so let us rewrite our code from before
becomes
and Et Voila: No exception.
Survey bypass software. #4 Exploiting (Success Rate. Istall an adblocking extension/browser/plugin ect on your device (for android/ios istall an ad blocking browser app) and visit the website again. If your specific anti-ad app recognizes the code, the survey may be gone. If not try another plugin that blocks ads or try another method if nothing works.
[1] Well Designed Error Messages? That's new!
Python Serial Timeout Readlinemedivhmedivh
56811 gold badge1010 silver badges2222 bronze badges
Not the answer you're looking for? Browse other questions tagged pythonpyserial or ask your own question.Comments are closed.
|
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |