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TERM_IO.PAS
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Pascal/Delphi Source File
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1993-03-09
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5KB
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205 lines
(* TERM_IO.PAS *)
{ $DEFINE DEBUG}
{$I DEFINES.PAS}
(*********************************************)
(* *)
(* Used for I/O by TERM.PAS *)
(* *)
(* This program is donated to the Public *)
(* Domain by MarshallSoft Computing, Inc. *)
(* It is provided as an example of the use *)
(* of the Personal Communications Library. *)
(* *)
(*********************************************)
unit term_IO;
interface
type
String40 = String[40];
String20 = String[20];
Procedure WriteMsg(MsgString:String40; StartCol:Byte);
Procedure ReadMsg(VAR MsgString:String20; StartCol, MaxLength:Byte);
Procedure PutChar(Port:Integer; c:Byte);
Function GetChar(Port:Integer; Timeout:Integer):Integer;
Procedure SayError(Code:Integer;Message:String40);
Procedure TxCAN(Port:Integer);
implementation
uses PCL4P,HEX_IO,CRT;
const
CR : Byte = $0d;
ESC : Byte = $1B;
BS : Byte = $08;
BLK : Byte = $20;
CAN : Byte = $18;
Procedure WriteMsg(MsgString:String40; StartCol:Byte);
var
i:Integer;
Row:Byte;
Col:Byte;
begin
Col := WhereX;
Row := WhereY;
(* goto display window *)
Window(1,25,80,25);
HighVideo;
GotoXY(StartCol,1);
Write(MsgString);
for i := Length(MsgString)+1 to 39 do Write(' ');
(* back to main window *)
Window(1,1,80,24);
LowVideo;
GotoXY(Col,Row);
end;
Procedure ReadMsg(VAR MsgString:String20; StartCol, MaxLength:Byte);
Label 999;
var
Row:Byte;
Col:Byte;
i :Byte;
c :Char;
begin
Row := WhereY;
Col := WhereX;
(* goto display window *)
Window(1,25,80,25);
HighVideo;
(* input text from user *)
i := 0;
while true do
begin
GotoXY(StartCol+i,1);
c := ReadKey;
case ord(c) of
$0D : goto 999;
$1B : (* Escape *)
begin
(* return empty string *)
i := 0;
goto 999;
end;
$08 : (* backspace *)
begin
(* back up if can *)
if i > 0 then
begin
(* adjust buffer *)
i := i - 1;
(* write blank at cursor *)
GotoXY(StartCol+i,1);
write(' ');
GotoXY(StartCol+i,1)
end
end
else (* not one of above special chars *)
begin
(* save character *)
i := i + 1;
MsgString[i] := c;
(* display on bottom line *)
Write(c);
(* done ? *)
if i = MaxLength then goto 999;
end
end (* case *)
end; (* end while *)
999:(* set length *)
MsgString[0] := chr(i);
(* back to main window *)
Window(1,1,80,24);
LowVideo;
GotoXY(Col,Row);
end;
(*** Send character over serial line ***)
Procedure PutChar(Port:Integer; C:Byte);
var
Code:Integer;
begin
Code := SioPutc(Port,chr(C));
if Code < 0 then
begin
writeln('COM',1+Port,' error');
Code := SioError(Code);
Code := SioDone(Port);
Halt;
end;
{$IFDEF DEBUG}
if (C < $20) or (C > $7E) then
begin
write('[$');
WriteHexByte(C);
write(']');
end
else write( chr(C) );
{$ENDIF}
end;
(*** Receive character from serial line ***)
Function GetChar(Port:Integer; Timeout:Integer):Integer;
var
Code:Integer;
begin
Code := SioGetc(Port,Timeout);
if Code < -1 then
begin
writeln('COM',1+Port,' error');
Code := SioError(Code);
Halt;
end;
{$IFDEF DEBUG}
if (Code < $20) or (Code > $7E) then
begin
write('($');
WriteHexByte(Code);
write(')');
end
else write( chr(Code) );
{$ENDIF}
GetChar := Code;
end;
(*** Say error code ***)
procedure SayError(Code:Integer;Message:String40);
var
RetCode:Integer;
begin
writeln(Message);
if Code < 0 then RetCode := SioError( Code )
else if (Code and (FramingError or ParityError or OverrunError)) <> 0 then
begin (* Port Error *)
if (Code and FramingError) <> 0 then writeln('Framing Error');
if (Code and ParityError) <> 0 then writeln('Parity Error');
if (Code and OverrunError) <> 0 then writeln('Overrun Error')
end
end;
(*** Transmits CAN's ***)
Procedure TxCAN(Port:Integer);
const
CAN = $18;
var
I : Integer;
Code : Integer;
begin
for I:=1 to 6 do Code := SioPutc(Port,chr(CAN));
end;
end.