Program gets stuck on reading serial communication of arduino via Pyserial

Question

m trying to create a tool that help to simulate key press

but at part of this code mentioned below, the program gets stuck and its not proceeding

ser = serial.Serial(ACM)
ser.baudrate = 115200
ser.timeout = None
ser.flushInput()
ser.flushOutput()
ser.write(cmd)
p = ser.readline()
pr = p.decode("utf-8")
print(cmd)
print(pr)
ser.close()
print("Closed")

" ser.readline() is not reading the output of serial com /dev/ttyACM*

Thanks

Piglet · Accepted Answer · 2021-08-12 12:13:09Z

1

The PySerial documentation is unmistakable:

Be careful when using readline(). Do specify a timeout when opening the serial port otherwise it could block forever if no newline character is received.

You define: ser.timeout = None so what exactly do you expect your program to do, but block forever if you don't receive a newline?

Either make sure the sent lines are terminated or use a reasonable timeout.

answered Aug 12, 2021 at 12:13

Piglet

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