How to set dtr=False in method serialx.create_serial_connection()?

[qw-34]

On open connection dtr is always True. How to configure dtr flag before connection opened?
Example:

transport, protocol = await serialx.create_serial_connection(
    loop=loop,
    protocol_factory=your_protocol_factory,
    url="/dev/serial/by-id/port",
    baudrate=115200,
)

Passing next kwargs also not working:

rtscts: bool = False,
dsrdtr: bool = False,
rtsdtr_on_open: PinState = PinState.LOW,
rtsdtr_on_close: PinState = PinState.LOW,
dtr=False # raising error

Working pyserial example:

s = serial.Serial()
s.port = "/dev/ttyUSB0"
s.baudrate = 115200
s.dtr=False
s.open()

[puddly]

rtsdtr_on_open should control it.

How are you determining the DTR pin state after opening?

[qw-34]

rtsdtr_on_open should control it.

How are you determining the DTR pin state after opening?

By Arduino board reaction - dtr flag determine should board reset or not. On connection, when dtr=True board is resetting, otherwise not.

pyserial example is connecting to the board without reset.

[puddly]

To confirm, you tried this?

   transport, protocol = await serialx.create_serial_connection(
       loop=loop,
       protocol_factory=your_protocol_factory,
       url="/dev/serial/by-id/port",
       baudrate=115200,
+      rtsdtr_on_open=serialx.PinState.LOW,
   )

This should deassert the DTR line on connect.

[qw-34]

Yes, of course - it was first that I tried.

I found difference - in pyserial, when dtr=False the DTR control is disabled:
https://github.com/pyserial/pyserial/blob/a5c48d445fbc1943d4fabf8d9090a50fda3172fd/serial/serialwin32.py#L211

In serialx, the DTR control is enabled (and set to LOW or HIGH depends on rtsdtr_on_open):

serialx/serialx/platforms/serial_win32.py

Line 270 in 5b4fd47

dcb.fDtrControl = DTR_CONTROL_ENABLE

For clarify - OS Windows.

[puddly]

Ah, /dev/ttyUSB0 had me thinking you were using Linux or macOS. I'll have to investigate what control Windows offers here, there were some limitations when I last checked.

[qw-34]

Sorry for misleading you about the OS. It's just a copy-paste: development on Windows, production on Linux. But I've only tested it on Windows so far.