Bo Berglund wrote 6 lines
I haved a debugging tool program created on Windows and I am orting it to Linux
Ubuntu.
It seems to build just fine except for a combobox fill function which uses the
Windows way of populating the selectoer box with the serial ports available on
the system.
This is the code I use on Windows:
[...]
I have looked at /dev/tty* but it lists a large number of items which makes it
impossible for me. I do not belive all of?them are real serial ports...
What can I do to get a selector for real serial ports on Ubuntu.
would you believe you asked almost this very same question back in 2015, 2018, 2020, and here again in 2022 :)
in Sep 2018, giuliano colla posted this procedure to you:
procedure TForm1.btnScanPortClick(Sender: TObject);
var
PortNr: Integer;
PortName: String;
PortHandle: TSerialHandle;
begin
cbSelPort.Items.Clear;
cbSelPort.Text:= '';
{$IFDEF MSWINDOWS}
for PortNr := 1 to 9 do begin
PortName := 'COM' + IntToStr(PortNr);
PortHandle := SerOpen('\\.\'+PortName);
if PortHandle > 0 then begin
cbSelPort.Items.Add(PortName);
SerClose(PortHandle);
if cbSelPort.Text = '' then begin
cbSelPort.Text:=PortName;
PortSel.Caption:= PortName;
end;
end;
end;
{$ELSE}
for PortNr := 0 to 9 do begin
PortName := '/dev/ttyS' + IntToStr(PortNr);
PortHandle := SerOpen(PortName);
if PortHandle > 0 then begin
if cbSelPort.Text = '' then begin
cbSelPort.Text:=PortName;
PortSel.Caption:= PortName;
end;
cbSelPort.Items.Add(PortName);
SerClose(PortHandle);
end;
end;
for PortNr := 0 to 9 do begin
PortName := '/dev/ttyUSB' + IntToStr(PortNr);
PortHandle := SerOpen(PortName);
if PortHandle > 0 then begin
if cbSelPort.Text = '' then begin
cbSelPort.Text:=PortName;
PortSel.Caption:= PortName;
end;
cbSelPort.Items.Add(PortName);
SerClose(PortHandle);
end;
end;
{$ENDIF}
end;
and in that same thread in Sep 2018, mark morgan lloyd posted this function to you:
(* If there are no serial ports on the system then return NIL, otherwise a *)
(* TStringList. *)
(* *)
(* This returns an object, it is the caller's (eventual) responsibility to free *)
(* this. *)
//
FUNCTION EnumeratePorts: TStringList;
(* On a Linux system with udev or similar the /dev directory will only contain *)
(* devices which have been detected as being present. On an older system it *)
(* will probably contain all possible devices so we need to restrict the list *)
(* to what's reasonable; the user should still be able to enter a device name *)
(* manually if necessary, e.g. where a machine with 2x standard ports plus a *)
(* 2-port card insists that it's got ttyS0, ttyS1, ttyS45 and ttyS46. *)
CONST countTtyS= 12; (* Main board plus an 8-port card *) countTtyUSB= 8; (* Four dual-port adapters *) countTtyI= 4; (* A single 4-port ISDN card. *)
VAR searchRec: TSearchRec;
counter: INTEGER;
BEGIN
RESULT:= TStringList.Create;
RESULT.Sorted:= TRUE;
counter:= countTtyS;
IF FindFirst('/dev/ttyS*', faSysFile, searchRec) = 0 THEN
REPEAT
RESULT.Append('/dev/' + searchRec.Name);
DEC(counter)
UNTIL (FindNext(searchRec) 0) OR (counter <= 0);
FindClose(searchRec);
counter:= countTtyUSB;
IF FindFirst('/dev/ttyUSB*', faSysFile, searchRec) = 0 THEN
REPEAT
RESULT.Append('/dev/' + searchRec.Name);
DEC(counter)
UNTIL (FindNext(searchRec) 0) OR (counter <= 0);
FindClose(searchRec);
counter:= countTtyI;
IF FindFirst('/dev/ttyI*', faSysFile, searchRec) = 0 THEN
REPEAT
RESULT.Append('/dev/' + searchRec.Name);
DEC(counter)
UNTIL (FindNext(searchRec) 0) OR (counter <= 0);
FindClose(searchRec);
IF Result.Count = 0 THEN
FreeAndNil(RESULT)
END { EnumeratePorts } ;
in another thread back in Oct 2020, posted this function to you:
Function GetSerialPortNames(): String;
Var
sl: TStringlist;
Var
Info: TSearchRec;
hdl: THandle;
b: Boolean;
Begin
sl := TStringlist.create;
If FindFirst('/dev/tty*', faSysFile, Info) = 0 Then Begin
Repeat
b := true;
Try
hdl := FileOpen('/dev/' + info.Name, fmOpenReadWrite);
If hdl = -1 Then Begin
b := false;
End;
Except
b := false;
End;
If hdl >= 0 Then Begin
FileClose(hdl);
End;
If b Then Begin
sl.Add('/dev/' + info.Name);
End;
Until FindNext(info) 0;
End;
FindClose(Info);
result := sl.CommaText;
sl.free;
End;
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