Re: SerialPort.Open [Polling]?

[Claus Dietrich <claus.dietrich@xxxxxxxxxx>]

Am 06.06.24 um 00:19 schrieb Benoît Minisini:
> Le 05/06/2024 à 23:47, T Lee Davidson a écrit :
> > I thought Benoît's reply explained it. Does the edit I made to the 
> > https://gambaswiki.org/wiki/comp/gb.net/serialport/open page make 
> > sense to you? Or, does it need to be reworded for more clarity?
>
> It seems ok to me, thanks.
>
> --
> Benoît Minisini.

Hi Lee and Benoít

I can't agree with the current editing and assume that there is still a 
misunderstanding.

The polling of handshake lines doesn't make any sense to me. These lines 
have to be handled on the spot and can't be subject to polling cycles. 
All handshake lines must be treated immediately upon the occurance of an 
interrupt provided by the UART.

I rather believed, that your first assumption was correct. That means 
that the presence of received data is indeed checked in a cycle defined 
by the polling parameter. Since Benoit didn't reply to my question about 
the detection criteria I am assuming that data are always received byte 
by byte and put into the buffer.

I also wouldn't say, that "polling is not used when xxxChange events are 
handled". The use of change events only make sense, if the FlowControl 
property is set accordingly.

Please apologize that I don't have the competence to fully understand 
the c-code behind the SerialPort class and I might be entirely wrong, 
but based on my assumption I would rather have amended the follow to the 
documentation:

"The optional polling parameter is used to adjust the polling rate for 
received data in ms. If no parameter is used the default polling rate of 
50ms applies. If data are received during the polling cycle they are 
made available in the Read event handler. Take note that polling is not 
used when the property Flowcontrol is set to Hardware."

Take this as a counter proposal. Any comment/ correction would be very 
welcome. We just should try to get it right (also for the Gambas-Buch ;-)).

Regards

Claus