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- (*********************************************)
- (* *)
- (* SIMPLE.PAS Jan 92 *)
- (* *)
- (* SIMPLE is provided as the simpliest *)
- (* possible terminal program using PCL4P *)
- (* *)
- (* 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. *)
- (* *)
- (*********************************************)
-
-
- program simple;
- uses crt, PCL4P;
-
- const
- BaudCode = Baud2400; (* Choose baud rate: Baud300 to Baud115200 *)
- var
- Buffer : array[0..1024] of Char;
- RetCode : Integer;
- Byte : Char;
- i : Integer;
- Port : Integer;
- ResetFlag : Boolean;
-
- procedure SayError( Code : Integer );
- var
- RetCode : Integer;
- begin
- 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;
-
- procedure MyHalt( Code : Integer );
- var
- RetCode : Integer;
- begin
- if Code < 0 then SayError( Code );
- if ResetFlag then RetCode := SioDone(Port);
- writeln('*** HALTING ***');
- Halt;
- end;
-
- begin (* main program *)
- ResetFlag := FALSE;
- (* fetch PORT # from command line *)
- if ParamCount <> 1 then
- begin
- writeln('USAGE: "CALLPGM <port>" where port = 1,2,3, or 4');
- halt;
- end;
- Val( ParamStr(1),Port, RetCode );
- if RetCode <> 0 then
- begin
- writeln('Port must be 1 to 4');
- Halt;
- end;
- (* COM1 = 0, COM2 = 1, COM3 = 2, COM4 = 3 *)
- Port := Port - 1;
- if (Port<COM1) or (Port>COM4) then
- begin
- writeln('Port must be 1 to 4');
- Halt
- end;
- (* setup 1K receive buffer *)
- RetCode := SioRxBuf(Port, Ofs(Buffer), Seg(Buffer), Size1024);
- if RetCode < 0 then MyHalt( RetCode );
- (* reset port *)
- RetCode := SioReset(Port,BaudCode);
- (* if error then try one more time *)
- if RetCode <> 0 then RetCode := SioReset(Port,BaudCode);
- (* Was port reset ? *)
- if RetCode <> 0 then
- begin
- writeln('Cannot reset COM',Port+1);
- MyHalt( RetCode );
- end;
- (* Port successfully reset *)
- writeln('Reset successfull');
- ResetFlag := TRUE;
- (* specify parity, # stop bits, and word length for port *)
- RetCode := SioParms(Port, NoParity, OneStopBit, WordLength8);
- if RetCode < 0 then MyHalt( RetCode );
- writeln; writeln(' CALLPGM 1.0: COM',1+Port,': 2400 Baud: Type ESC to quit');
- RetCode := SioRxFlush(Port);
- if RetCode < 0 then MyHalt( RetCode );
- (* begin terminal loop *)
- writeln('Enter terminal loop');
- while TRUE do
- begin
- (* did user press Ctrl-BREAK ? *)
- if SioBrkKey then
- begin
- writeln('User typed Ctl-BREAK');
- RetCode := SioDone(Port);
- Halt;
- end;
- (* anything incoming over serial port ? *)
- RetCode := SioGetc(Port,0);
- if RetCode < -1 then MyHalt( RetCode );
- if RetCode > -1 then Write( chr(RetCode) );
- (* has user pressed keyboard ? *)
- if KeyPressed then
- begin
- (* read keyboard *)
- Byte := ReadKey;
- (* quit if user types ESC *)
- if Byte = chr($1b) then
- begin
- writeln('User typed ESC');
- RetCode := SioDone(Port);
- Halt;
- end;
- (* send out over serial line *)
- RetCode := SioPutc(Port, Byte );
- if RetCode < 0 then MyHalt( RetCode );
- end
- end
- end.