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pythonlinuxcatpyserialtty

Cannot open /dev/tty/USB0 with cat after being used with pyserial

After having opened my serial port /dev/tty/USB0with pyserial:

>>> ser = serial.Serial("/dev/ttyUSB0", 57600)
>>> ser.isOpen()
True
>>> ser.close()
>>> ser.isOpen()
False

I can no longer read /dev/ttyUSB0with the command cat /dev/ttyUSB0
usually cat /dev/ttyUSB0 is a blocking command like read, but after the serial port is opened/closed with pyserial, the cat command become non blocking, seems like busy ...

Does anybody knows what causes this?

Solution

  • when pyserial opens the tty, it implicitly reconfigure some parameters of the tty for example: time=0 which set the timeout to 0 second, and min=0, which set the minimum characters to read, etc.

    And to restore the default behavior, use the linux command stty
    stty -F /dev/ttyUSB0 icanon