Why do I receive unreadable data via serial Port on Raspberry Pi?

[B0naparte]

I receive data with an Raspberry Pi3 from another device with an ATMEGA 8 Chip via serial port, what I receive should look like : #00 341 341 332 13123 R-? ...

But what I receive on my Raspberry is:

b'\xff\xfa\xfd\xff\xff\xff\xff\xff\xff\xfd\xff\xea~\xf8\xff\xfe\xfe\xff\xd5\xff\xfe\xfd\xff\xff\xfd\xff\xff\xff'

My port config:

port = serial.Serial("/dev/ttyAMA0", baudrate=115200, timeout=3.0)

How do I decode this or do you have any other suggestions?

I already tried to encode to utf-8, ascii etc. I also tried codecs. I just got errors or some more disturbing data. Nothin I can work with.

[DougieLawson]

That's almost always going to be a baud rate problem. Check the program running in your ATMEGA8.

[skywatch]

Serial on pi 3 version is not as stable as previous models of pi in my experience.

I suggest you get a serial to usb adaptor (about $1 or so) and try using that instead.

[hippy]

port = serial.Serial("/dev/ttyAMA0", baudrate=115200, timeout=3.0)

Doesn't ttyAMA0 normally connect to the Wi-Fi/Bluetooth chip on a "Pi 3" ?

Maybe try /dev/ttyS0 or, preferably, /dev/serial0.