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?
