Hello. I am using the NanoPi NEO Core board to communicate via UART1 and UART2 ports. I configure the ports using Python - pyserial. This is my configuration code:

 

import serial
com = serial.Serial(
            port = '/dev/ttyS' + str(port),
            baudrate = 115200,
            parity = serial.PARITY_NONE,
            stopbits = serial.STOPBITS_ONE,
            bytesize = serial.EIGHTBITS,
            timeout = 0.02
            )

 

The problem is that the UART TX signal is not clean, as you can see from the following pictures:

https://ibb.co/5sdvGVf

https://ibb.co/zfgZrGT

I get the same signal on both UART ports. I also confirm that I get a similar signal even when the UART TX pin is floating, which leads me to think it may be a software or UART interface problem.

Does anybody have a clue what the problem is?

moved to p2p since

neo core is H3

lacks requests information

3rd party script

3 hours ago, Werner said:

moved to p2p since

neo core is H3

lacks requests information

3rd party script

Hi. What do you mean by requests information and 3rd party script? I can add further details to the question if I understand what you mean.

The forum asks you before opening new topics in bug reporting forums to use the bug reporting form in order to differentiate if it is actual a bug and if so to provide necessary debug information for developers. I assume you did not do that properly.

https://www.armbian.com/bugs/

It turns out it was a problem with the oscilloscope.