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Synapse Synaser, list serial ports in linux 11 months 1 week ago #17659

  • Andrzej Franek
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The Synapse library in the SynaSer module includes a GetSerialPortNames function that lists available serial ports. On Linux, you get the contents of the directory listing files with the /dev/ser* mask. Below is my function (for linux) GetSerialPortNames returning a list of files from /dev/ser associated with connected devices. Maybe someone will find it useful.

{$ifdef linux}
function GetSerialPortNames: string;
var
  sr : TSearchRec;
  ser: TBlockSerial;
begin
  Result := '';
  if FindFirst('/dev/tty*', faAnyFile, sr) = 0 then
    repeat
      if (sr.Attr and $FFFFFFFF) = Sr.Attr then
      begin
         if (pos('S', sr.Name) > 0) or (pos('A', sr.Name) > 0) or (pos('USB', sr.Name) > 0) then
         begin
            try
            ser:=TBlockSerial.Create;
            ser.Connect('/dev/' + sr.Name);
            ser.config(460800,8,'N',0,false,true);
            ser.sendbyte(0);                      // try write to port
            if ser.LastError = 0 then             // write OK
               begin
               if Result <> '' then Result := Result + #13#10;
               Result := Result {+ '/dev/'} + sr.Name;
               end;
            finally
            ser.free;
            end;
         end;
      end;
    until FindNext(sr) <> 0;
  FindClose(sr);
end;
{$endif}    

 

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Synapse Synaser, list serial ports in linux 11 months 1 week ago #17660

  • Matis A.
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Thank
We will test and add your source code to Synapse pkg
PilotLogic Core Programmer

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Synapse Synaser, list serial ports in linux 10 months 3 weeks ago #17675

  • Vlad Wilhelm
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Gentlemen, good day!
It seems to me that a safer way would be to search the "/sys/class/tty/" folder for directories containing the "device/driver" folder, which indicates the presence of a physical device. This is sufficient WITHOUT transferring data to some file or even a real port that may be currently being used by another process.
For example:

procedure TmainFrm.FormCreate(Sender: TObject);
var
 sr: TSearchRec;
 r: integer;
begin
 ComboBox1.Items.Clear;
 r:= FindFirst('/sys/class/tty/*', faDirectory, sr);
 while r = 0 do begin
  if (sr.Name[1] <> '.') and DirectoryExists('/sys/class/tty/' + sr.Name + '/device/driver')
  then ComboBox1.Items.Add('/dev/' + sr.Name);
  r:= FindNext(sr);
    end;
 FindClose(sr);
end;

Sorry for the intrusion! :)

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Last edit: by Vlad Wilhelm.
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