[fpc-pascal] Using built-in serial instead of synaser and the like for Linux console app?

[Bo Berglund]

On Tue, 01 Sep 2020 10:22:08 +0200, Bo Berglund via fpc-pascal
<fpc-pascal at lists.freepascal.org> wrote:

>Maybe I could tie the timeout to the actual baud used? Slower speeds
>use longer timeout etc? Timeout could be set to the time it takes to
>transfer the number of bytes to read?
>
>And both arguments could be made properties of the class such that the
>user can tweak performance a bit?

I tried to do this:

  TComPortReadThread=class(TThread)
  private
    FBuffer: TBytes;
    FPacketSize: integer; default 10;
    FReadTimeout: integer; default 10;
  public
    MustDie: boolean;
    Owner: TFpSerialPort;
    property ReadPacketSize: integer read FPacketSize write
FPacketSize; //How many bytes to read in each operation
    property ReadTimeout: integer read FReadTimeout write
FReadTimeout;    //Max time to wait for data in thread
  protected
    procedure CallEvent;
    procedure Execute; override;
  published
    property Terminated;
  end;

But I cannot set the default value of the two new fields FPacketSize
and FReadTimeout, I get an error in the above code (and variations of
the same).
Is there no way to declare a property to have a default non-zero
value?

Note that the thread itself has no idea what is the baudrate in use so
it cannot calculate the proper value at the start of Execute...
And there is no Create method either that I can use.

Any ideas?

-- 
Bo Berglund
Developer in Sweden