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synaser.pas
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{==============================================================================|
| Project : Ararat Synapse | 007.005.004 |
|==============================================================================|
| Content: Serial port support |
|==============================================================================|
| Copyright (c)2001-2012, Lukas Gebauer |
| All rights reserved. |
| |
| Redistribution and use in source and binary forms, with or without |
| modification, are permitted provided that the following conditions are met: |
| |
| Redistributions of source code must retain the above copyright notice, this |
| list of conditions and the following disclaimer. |
| |
| Redistributions in binary form must reproduce the above copyright notice, |
| this list of conditions and the following disclaimer in the documentation |
| and/or other materials provided with the distribution. |
| |
| Neither the name of Lukas Gebauer nor the names of its contributors may |
| be used to endorse or promote products derived from this software without |
| specific prior written permission. |
| |
| THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
| AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR |
| ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR |
| SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER |
| CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH |
| DAMAGE. |
|==============================================================================|
| The Initial Developer of the Original Code is Lukas Gebauer (Czech Republic).|
| Portions created by Lukas Gebauer are Copyright (c)2001-2012. |
| All Rights Reserved. |
|==============================================================================|
| Contributor(s): |
| (c)2002, Hans-Georg Joepgen (cpom Comport Ownership Manager and bugfixes) |
|==============================================================================|
| History: see HISTORY.HTM from distribution package |
| (Found at URL: http://www.ararat.cz/synapse/) |
|==============================================================================}
{: @abstract(Serial port communication library)
This unit contains a class that implements serial port communication
for Windows, Linux, Unix or MacOSx. This class provides numerous methods with
same name and functionality as methods of the Ararat Synapse TCP/IP library.
The following is a small example how establish a connection by modem (in this
case with my USB modem):
@longcode(#
ser:=TBlockSerial.Create;
try
ser.Connect('COM3');
ser.config(460800,8,'N',0,false,true);
ser.ATCommand('AT');
if (ser.LastError <> 0) or (not ser.ATResult) then
Exit;
ser.ATConnect('ATDT+420971200111');
if (ser.LastError <> 0) or (not ser.ATResult) then
Exit;
// you are now connected to a modem at +420971200111
// you can transmit or receive data now
finally
ser.free;
end;
#)
}
//old Delphi does not have MSWINDOWS define.
{$IFDEF WIN32}
{$IFNDEF MSWINDOWS}
{$DEFINE MSWINDOWS}
{$ENDIF}
{$ENDIF}
//Kylix does not known UNIX define
{$IFDEF LINUX}
{$IFNDEF UNIX}
{$DEFINE UNIX}
{$ENDIF}
{$ENDIF}
{$IFDEF FPC}
{$MODE DELPHI}
{$IFDEF MSWINDOWS}
{$ASMMODE intel}
{$ENDIF}
{define working mode w/o LIBC for fpc}
{$DEFINE NO_LIBC}
{$ENDIF}
{$Q-}
{$H+}
{$M+}
unit synaser;
interface
uses
{$IFNDEF MSWINDOWS}
{$IFNDEF NO_LIBC}
Libc,
KernelIoctl,
{$ELSE}
termio, baseunix, unix,
{$ENDIF}
{$IFNDEF FPC}
Types,
{$ENDIF}
{$ELSE}
Windows, registry,
{$IFDEF FPC}
winver,
{$ENDIF}
{$ENDIF}
synafpc,
Classes, SysUtils, synautil;
const
CR = #$0d;
LF = #$0a;
CRLF = CR + LF;
cSerialChunk = 8192;
LockfileDirectory = '/var/lock'; {HGJ}
PortIsClosed = -1; {HGJ}
ErrAlreadyOwned = 9991; {HGJ}
ErrAlreadyInUse = 9992; {HGJ}
ErrWrongParameter = 9993; {HGJ}
ErrPortNotOpen = 9994; {HGJ}
ErrNoDeviceAnswer = 9995; {HGJ}
ErrMaxBuffer = 9996;
ErrTimeout = 9997;
ErrNotRead = 9998;
ErrFrame = 9999;
ErrOverrun = 10000;
ErrRxOver = 10001;
ErrRxParity = 10002;
ErrTxFull = 10003;
dcb_Binary = $00000001;
dcb_ParityCheck = $00000002;
dcb_OutxCtsFlow = $00000004;
dcb_OutxDsrFlow = $00000008;
dcb_DtrControlMask = $00000030;
dcb_DtrControlDisable = $00000000;
dcb_DtrControlEnable = $00000010;
dcb_DtrControlHandshake = $00000020;
dcb_DsrSensivity = $00000040;
dcb_TXContinueOnXoff = $00000080;
dcb_OutX = $00000100;
dcb_InX = $00000200;
dcb_ErrorChar = $00000400;
dcb_NullStrip = $00000800;
dcb_RtsControlMask = $00003000;
dcb_RtsControlDisable = $00000000;
dcb_RtsControlEnable = $00001000;
dcb_RtsControlHandshake = $00002000;
dcb_RtsControlToggle = $00003000;
dcb_AbortOnError = $00004000;
dcb_Reserveds = $FFFF8000;
{:stopbit value for 1 stopbit}
SB1 = 0;
{:stopbit value for 1.5 stopbit}
SB1andHalf = 1;
{:stopbit value for 2 stopbits}
SB2 = 2;
{$IFNDEF MSWINDOWS}
const
INVALID_HANDLE_VALUE = THandle(-1);
CS7fix = $0000020;
type
TDCB = record
DCBlength: DWORD;
BaudRate: DWORD;
Flags: Longint;
wReserved: Word;
XonLim: Word;
XoffLim: Word;
ByteSize: Byte;
Parity: Byte;
StopBits: Byte;
XonChar: CHAR;
XoffChar: CHAR;
ErrorChar: CHAR;
EofChar: CHAR;
EvtChar: CHAR;
wReserved1: Word;
end;
PDCB = ^TDCB;
const
{$IFDEF UNIX}
{$IFDEF BSD}
MaxRates = 18; //MAC
{$ELSE}
MaxRates = 30; //UNIX
{$ENDIF}
{$ELSE}
MaxRates = 19; //WIN
{$ENDIF}
Rates: array[0..MaxRates, 0..1] of cardinal =
(
(0, B0),
(50, B50),
(75, B75),
(110, B110),
(134, B134),
(150, B150),
(200, B200),
(300, B300),
(600, B600),
(1200, B1200),
(1800, B1800),
(2400, B2400),
(4800, B4800),
(9600, B9600),
(19200, B19200),
(38400, B38400),
(57600, B57600),
(115200, B115200),
(230400, B230400)
{$IFNDEF BSD}
,(460800, B460800)
{$IFDEF UNIX}
,(500000, B500000),
(576000, B576000),
(921600, B921600),
(1000000, B1000000),
(1152000, B1152000),
(1500000, B1500000),
(2000000, B2000000),
(2500000, B2500000),
(3000000, B3000000),
(3500000, B3500000),
(4000000, B4000000)
{$ENDIF}
{$ENDIF}
);
{$ENDIF}
{$IFDEF DARWIN}
const // From fcntl.h
O_SYNC = $0080; { synchronous writes }
{$ENDIF}
const
sOK = 0;
sErr = integer(-1);
type
{:Possible status event types for @link(THookSerialStatus)}
THookSerialReason = (
HR_SerialClose,
HR_Connect,
HR_CanRead,
HR_CanWrite,
HR_ReadCount,
HR_WriteCount,
HR_Wait
);
{:procedural prototype for status event hooking}
THookSerialStatus = procedure(Sender: TObject; Reason: THookSerialReason;
const Value: string) of object;
{:@abstract(Exception type for SynaSer errors)}
ESynaSerError = class(Exception)
public
ErrorCode: integer;
ErrorMessage: string;
end;
{:@abstract(Main class implementing all communication routines)}
TBlockSerial = class(TObject)
protected
FOnStatus: THookSerialStatus;
Fhandle: THandle;
FTag: integer;
FDevice: string;
FLastError: integer;
FLastErrorDesc: string;
FBuffer: AnsiString;
FRaiseExcept: boolean;
FRecvBuffer: integer;
FSendBuffer: integer;
FModemWord: integer;
FRTSToggle: Boolean;
FDeadlockTimeout: integer;
FInstanceActive: boolean; {HGJ}
FTestDSR: Boolean;
FTestCTS: Boolean;
FLastCR: Boolean;
FLastLF: Boolean;
FMaxLineLength: Integer;
FLinuxLock: Boolean;
FMaxSendBandwidth: Integer;
FNextSend: LongWord;
FMaxRecvBandwidth: Integer;
FNextRecv: LongWord;
FConvertLineEnd: Boolean;
FATResult: Boolean;
FAtTimeout: integer;
FInterPacketTimeout: Boolean;
FComNr: integer;
{$IFDEF MSWINDOWS}
FPortAddr: Word;
function CanEvent(Event: dword; Timeout: integer): boolean;
procedure DecodeCommError(Error: DWord); virtual;
{$IFDEF WIN32}
function GetPortAddr: Word; virtual;
function ReadTxEmpty(PortAddr: Word): Boolean; virtual;
{$ENDIF}
{$ENDIF}
procedure SetSizeRecvBuffer(size: integer); virtual;
function GetDSR: Boolean; virtual;
procedure SetDTRF(Value: Boolean); virtual;
function GetCTS: Boolean; virtual;
procedure SetRTSF(Value: Boolean); virtual;
function GetCarrier: Boolean; virtual;
function GetRing: Boolean; virtual;
procedure DoStatus(Reason: THookSerialReason; const Value: string); virtual;
procedure GetComNr(Value: string); virtual;
function PreTestFailing: boolean; virtual;{HGJ}
function TestCtrlLine: Boolean; virtual;
{$IFDEF UNIX}
procedure DcbToTermios(const dcb: TDCB; var term: termios); virtual;
procedure TermiosToDcb(const term: termios; var dcb: TDCB); virtual;
function ReadLockfile: integer; virtual;
function LockfileName: String; virtual;
procedure CreateLockfile(PidNr: integer); virtual;
{$ENDIF}
procedure LimitBandwidth(Length: Integer; MaxB: integer; var Next: LongWord); virtual;
procedure SetBandwidth(Value: Integer); virtual;
public
{: data Control Block with communication parameters. Usable only when you
need to call API directly.}
DCB: Tdcb;
{$IFDEF UNIX}
TermiosStruc: termios;
{$ENDIF}
{:Object constructor.}
constructor Create;
{:Object destructor.}
destructor Destroy; override;
{:Returns a string containing the version number of the library.}
class function GetVersion: string; virtual;
{:Destroy handle in use. It close connection to serial port.}
procedure CloseSocket; virtual;
{:Reconfigure communication parameters on the fly. You must be connected to
port before!
@param(baud Define connection speed. Baud rate can be from 50 to 4000000
bits per second. (it depends on your hardware!))
@param(bits Number of bits in communication.)
@param(parity Define communication parity (N - None, O - Odd, E - Even, M - Mark or S - Space).)
@param(stop Define number of stopbits. Use constants @link(SB1),
@link(SB1andHalf) and @link(SB2).)
@param(softflow Enable XON/XOFF handshake.)
@param(hardflow Enable CTS/RTS handshake.)}
procedure Config(baud, bits: integer; parity: char; stop: integer;
softflow, hardflow: boolean); virtual;
{:Connects to the port indicated by comport. Comport can be used in Windows
style (COM2), or in Linux style (/dev/ttyS1). When you use windows style
in Linux, then it will be converted to Linux name. And vice versa! However
you can specify any device name! (other device names then standart is not
converted!)
After successfull connection the DTR signal is set (if you not set hardware
handshake, then the RTS signal is set, too!)
Connection parameters is predefined by your system configuration. If you
need use another parameters, then you can use Config method after.
Notes:
- Remember, the commonly used serial Laplink cable does not support
hardware handshake.
- Before setting any handshake you must be sure that it is supported by
your hardware.
- Some serial devices are slow. In some cases you must wait up to a few
seconds after connection for the device to respond.
- when you connect to a modem device, then is best to test it by an empty
AT command. (call ATCommand('AT'))}
procedure Connect(comport: string); virtual;
{:Set communication parameters from the DCB structure (the DCB structure is
simulated under Linux).}
procedure SetCommState; virtual;
{:Read communication parameters into the DCB structure (DCB structure is
simulated under Linux).}
procedure GetCommState; virtual;
{:Sends Length bytes of data from Buffer through the connected port.}
function SendBuffer(buffer: pointer; length: integer): integer; virtual;
{:One data BYTE is sent.}
procedure SendByte(data: byte); virtual;
{:Send the string in the data parameter. No terminator is appended by this
method. If you need to send a string with CR/LF terminator, you must append
the CR/LF characters to the data string!
Since no terminator is appended, you can use this function for sending
binary data too.}
procedure SendString(data: AnsiString); virtual;
{:send four bytes as integer.}
procedure SendInteger(Data: integer); virtual;
{:send data as one block. Each block begins with integer value with Length
of block.}
procedure SendBlock(const Data: AnsiString); virtual;
{:send content of stream from current position}
procedure SendStreamRaw(const Stream: TStream); virtual;
{:send content of stream as block. see @link(SendBlock)}
procedure SendStream(const Stream: TStream); virtual;
{:send content of stream as block, but this is compatioble with Indy library.
(it have swapped lenght of block). See @link(SendStream)}
procedure SendStreamIndy(const Stream: TStream); virtual;
{:Waits until the allocated buffer is filled by received data. Returns number
of data bytes received, which equals to the Length value under normal
operation. If it is not equal, the communication channel is possibly broken.
This method not using any internal buffering, like all others receiving
methods. You cannot freely combine this method with all others receiving
methods!}
function RecvBuffer(buffer: pointer; length: integer): integer; virtual;
{:Method waits until data is received. If no data is received within
the Timeout (in milliseconds) period, @link(LastError) is set to
@link(ErrTimeout). This method is used to read any amount of data
(e. g. 1MB), and may be freely combined with all receviving methods what
have Timeout parameter, like the @link(RecvString), @link(RecvByte) or
@link(RecvTerminated) methods.}
function RecvBufferEx(buffer: pointer; length: integer; timeout: integer): integer; virtual;
{:It is like recvBufferEx, but data is readed to dynamicly allocated binary
string.}
function RecvBufferStr(Length: Integer; Timeout: Integer): AnsiString; virtual;
{:Read all available data and return it in the function result string. This
function may be combined with @link(RecvString), @link(RecvByte) or related
methods.}
function RecvPacket(Timeout: Integer): AnsiString; virtual;
{:Waits until one data byte is received which is returned as the function
result. If no data is received within the Timeout (in milliseconds) period,
@link(LastError) is set to @link(ErrTimeout).}
function RecvByte(timeout: integer): byte; virtual;
{:This method waits until a terminated data string is received. This string
is terminated by the Terminator string. The resulting string is returned
without this termination string! If no data is received within the Timeout
(in milliseconds) period, @link(LastError) is set to @link(ErrTimeout).}
function RecvTerminated(Timeout: Integer; const Terminator: AnsiString): AnsiString; virtual;
{:This method waits until a terminated data string is received. The string
is terminated by a CR/LF sequence. The resulting string is returned without
the terminator (CR/LF)! If no data is received within the Timeout (in
milliseconds) period, @link(LastError) is set to @link(ErrTimeout).
If @link(ConvertLineEnd) is used, then the CR/LF sequence may not be exactly
CR/LF. See the description of @link(ConvertLineEnd).
This method serves for line protocol implementation and uses its own
buffers to maximize performance. Therefore do NOT use this method with the
@link(RecvBuffer) method to receive data as it may cause data loss.}
function Recvstring(timeout: integer): AnsiString; virtual;
{:Waits until four data bytes are received which is returned as the function
integer result. If no data is received within the Timeout (in milliseconds) period,
@link(LastError) is set to @link(ErrTimeout).}
function RecvInteger(Timeout: Integer): Integer; virtual;
{:Waits until one data block is received. See @link(sendblock). If no data
is received within the Timeout (in milliseconds) period, @link(LastError)
is set to @link(ErrTimeout).}
function RecvBlock(Timeout: Integer): AnsiString; virtual;
{:Receive all data to stream, until some error occured. (for example timeout)}
procedure RecvStreamRaw(const Stream: TStream; Timeout: Integer); virtual;
{:receive requested count of bytes to stream}
procedure RecvStreamSize(const Stream: TStream; Timeout: Integer; Size: Integer); virtual;
{:receive block of data to stream. (Data can be sended by @link(sendstream)}
procedure RecvStream(const Stream: TStream; Timeout: Integer); virtual;
{:receive block of data to stream. (Data can be sended by @link(sendstreamIndy)}
procedure RecvStreamIndy(const Stream: TStream; Timeout: Integer); virtual;
{:Returns the number of received bytes waiting for reading. 0 is returned
when there is no data waiting.}
function WaitingData: integer; virtual;
{:Same as @link(WaitingData), but in respect to data in the internal
@link(LineBuffer).}
function WaitingDataEx: integer; virtual;
{:Returns the number of bytes waiting to be sent in the output buffer.
0 is returned when the output buffer is empty.}
function SendingData: integer; virtual;
{:Enable or disable RTS driven communication (half-duplex). It can be used
to communicate with RS485 converters, or other special equipment. If you
enable this feature, the system automatically controls the RTS signal.
Notes:
- On Windows NT (or higher) ir RTS signal driven by system driver.
- On Win9x family is used special code for waiting until last byte is
sended from your UART.
- On Linux you must have kernel 2.1 or higher!}
procedure EnableRTSToggle(value: boolean); virtual;
{:Waits until all data to is sent and buffers are emptied.
Warning: On Windows systems is this method returns when all buffers are
flushed to the serial port controller, before the last byte is sent!}
procedure Flush; virtual;
{:Unconditionally empty all buffers. It is good when you need to interrupt
communication and for cleanups.}
procedure Purge; virtual;
{:Returns @True, if you can from read any data from the port. Status is
tested for a period of time given by the Timeout parameter (in milliseconds).
If the value of the Timeout parameter is 0, the status is tested only once
and the function returns immediately. If the value of the Timeout parameter
is set to -1, the function returns only after it detects data on the port
(this may cause the process to hang).}
function CanRead(Timeout: integer): boolean; virtual;
{:Returns @True, if you can write any data to the port (this function is not
sending the contents of the buffer). Status is tested for a period of time
given by the Timeout parameter (in milliseconds). If the value of
the Timeout parameter is 0, the status is tested only once and the function
returns immediately. If the value of the Timeout parameter is set to -1,
the function returns only after it detects that it can write data to
the port (this may cause the process to hang).}
function CanWrite(Timeout: integer): boolean; virtual;
{:Same as @link(CanRead), but the test is against data in the internal
@link(LineBuffer) too.}
function CanReadEx(Timeout: integer): boolean; virtual;
{:Returns the status word of the modem. Decoding the status word could yield
the status of carrier detect signaland other signals. This method is used
internally by the modem status reading properties. You usually do not need
to call this method directly.}
function ModemStatus: integer; virtual;
{:Send a break signal to the communication device for Duration milliseconds.}
procedure SetBreak(Duration: integer); virtual;
{:This function is designed to send AT commands to the modem. The AT command
is sent in the Value parameter and the response is returned in the function
return value (may contain multiple lines!).
If the AT command is processed successfully (modem returns OK), then the
@link(ATResult) property is set to True.
This function is designed only for AT commands that return OK or ERROR
response! To call connection commands the @link(ATConnect) method.
Remember, when you connect to a modem device, it is in AT command mode.
Now you can send AT commands to the modem. If you need to transfer data to
the modem on the other side of the line, you must first switch to data mode
using the @link(ATConnect) method.}
function ATCommand(value: AnsiString): AnsiString; virtual;
{:This function is used to send connect type AT commands to the modem. It is
for commands to switch to connected state. (ATD, ATA, ATO,...)
It sends the AT command in the Value parameter and returns the modem's
response (may be multiple lines - usually with connection parameters info).
If the AT command is processed successfully (the modem returns CONNECT),
then the ATResult property is set to @True.
This function is designed only for AT commands which respond by CONNECT,
BUSY, NO DIALTONE NO CARRIER or ERROR. For other AT commands use the
@link(ATCommand) method.
The connect timeout is 90*@link(ATTimeout). If this command is successful
(@link(ATresult) is @true), then the modem is in data state. When you now
send or receive some data, it is not to or from your modem, but from the
modem on other side of the line. Now you can transfer your data.
If the connection attempt failed (@link(ATResult) is @False), then the
modem is still in AT command mode.}
function ATConnect(value: AnsiString): AnsiString; virtual;
{:If you "manually" call API functions, forward their return code in
the SerialResult parameter to this function, which evaluates it and sets
@link(LastError) and @link(LastErrorDesc).}
function SerialCheck(SerialResult: integer): integer; virtual;
{:If @link(Lasterror) is not 0 and exceptions are enabled, then this procedure
raises an exception. This method is used internally. You may need it only
in special cases.}
procedure ExceptCheck; virtual;
{:Set Synaser to error state with ErrNumber code. Usually used by internal
routines.}
procedure SetSynaError(ErrNumber: integer); virtual;
{:Raise Synaser error with ErrNumber code. Usually used by internal routines.}
procedure RaiseSynaError(ErrNumber: integer); virtual;
{$IFDEF UNIX}
function cpomComportAccessible: boolean; virtual;{HGJ}
procedure cpomReleaseComport; virtual; {HGJ}
{$ENDIF}
{:True device name of currently used port}
property Device: string read FDevice;
{:Error code of last operation. Value is defined by the host operating
system, but value 0 is always OK.}
property LastError: integer read FLastError;
{:Human readable description of LastError code.}
property LastErrorDesc: string read FLastErrorDesc;
{:Indicates if the last @link(ATCommand) or @link(ATConnect) method was successful}
property ATResult: Boolean read FATResult;
{:Read the value of the RTS signal.}
property RTS: Boolean write SetRTSF;
{:Indicates the presence of the CTS signal}
property CTS: boolean read GetCTS;
{:Use this property to set the value of the DTR signal.}
property DTR: Boolean write SetDTRF;
{:Exposes the status of the DSR signal.}
property DSR: boolean read GetDSR;
{:Indicates the presence of the Carrier signal}
property Carrier: boolean read GetCarrier;
{:Reflects the status of the Ring signal.}
property Ring: boolean read GetRing;
{:indicates if this instance of SynaSer is active. (Connected to some port)}
property InstanceActive: boolean read FInstanceActive; {HGJ}
{:Defines maximum bandwidth for all sending operations in bytes per second.
If this value is set to 0 (default), bandwidth limitation is not used.}
property MaxSendBandwidth: Integer read FMaxSendBandwidth Write FMaxSendBandwidth;
{:Defines maximum bandwidth for all receiving operations in bytes per second.
If this value is set to 0 (default), bandwidth limitation is not used.}
property MaxRecvBandwidth: Integer read FMaxRecvBandwidth Write FMaxRecvBandwidth;
{:Defines maximum bandwidth for all sending and receiving operations
in bytes per second. If this value is set to 0 (default), bandwidth
limitation is not used.}
property MaxBandwidth: Integer Write SetBandwidth;
{:Size of the Windows internal receive buffer. Default value is usually
4096 bytes. Note: Valid only in Windows versions!}
property SizeRecvBuffer: integer read FRecvBuffer write SetSizeRecvBuffer;
published
{:Returns the descriptive text associated with ErrorCode. You need this
method only in special cases. Description of LastError is now accessible
through the LastErrorDesc property.}
class function GetErrorDesc(ErrorCode: integer): string;
{:Freely usable property}
property Tag: integer read FTag write FTag;
{:Contains the handle of the open communication port.
You may need this value to directly call communication functions outside
SynaSer.}
property Handle: THandle read Fhandle write FHandle;
{:Internally used read buffer.}
property LineBuffer: AnsiString read FBuffer write FBuffer;
{:If @true, communication errors raise exceptions. If @false (default), only
the @link(LastError) value is set.}
property RaiseExcept: boolean read FRaiseExcept write FRaiseExcept;
{:This event is triggered when the communication status changes. It can be
used to monitor communication status.}
property OnStatus: THookSerialStatus read FOnStatus write FOnStatus;
{:If you set this property to @true, then the value of the DSR signal
is tested before every data transfer. It can be used to detect the presence
of a communications device.}
property TestDSR: boolean read FTestDSR write FTestDSR;
{:If you set this property to @true, then the value of the CTS signal
is tested before every data transfer. It can be used to detect the presence
of a communications device. Warning: This property cannot be used if you
need hardware handshake!}
property TestCTS: boolean read FTestCTS write FTestCTS;
{:Use this property you to limit the maximum size of LineBuffer
(as a protection against unlimited memory allocation for LineBuffer).
Default value is 0 - no limit.}
property MaxLineLength: Integer read FMaxLineLength Write FMaxLineLength;
{:This timeout value is used as deadlock protection when trying to send data
to (or receive data from) a device that stopped communicating during data
transmission (e.g. by physically disconnecting the device).
The timeout value is in milliseconds. The default value is 30,000 (30 seconds).}
property DeadlockTimeout: Integer read FDeadlockTimeout Write FDeadlockTimeout;
{:If set to @true (default value), port locking is enabled (under Linux only).
WARNING: To use this feature, the application must run by a user with full
permission to the /var/lock directory!}
property LinuxLock: Boolean read FLinuxLock write FLinuxLock;
{:Indicates if non-standard line terminators should be converted to a CR/LF pair
(standard DOS line terminator). If @TRUE, line terminators CR, single LF
or LF/CR are converted to CR/LF. Defaults to @FALSE.
This property has effect only on the behavior of the RecvString method.}
property ConvertLineEnd: Boolean read FConvertLineEnd Write FConvertLineEnd;
{:Timeout for AT modem based operations}
property AtTimeout: integer read FAtTimeout Write FAtTimeout;
{:If @true (default), then all timeouts is timeout between two characters.
If @False, then timeout is overall for whoole reading operation.}
property InterPacketTimeout: Boolean read FInterPacketTimeout Write FInterPacketTimeout;
end;
{:Returns list of existing computer serial ports. Working properly only in Windows!}
function GetSerialPortNames: string;
implementation
constructor TBlockSerial.Create;
begin
inherited create;
FRaiseExcept := false;
FHandle := INVALID_HANDLE_VALUE;
FDevice := '';
FComNr:= PortIsClosed; {HGJ}
FInstanceActive:= false; {HGJ}
Fbuffer := '';
FRTSToggle := False;
FMaxLineLength := 0;
FTestDSR := False;
FTestCTS := False;
FDeadlockTimeout := 30000;
FLinuxLock := True;
FMaxSendBandwidth := 0;
FNextSend := 0;
FMaxRecvBandwidth := 0;
FNextRecv := 0;
FConvertLineEnd := False;
SetSynaError(sOK);
FRecvBuffer := 4096;
FLastCR := False;
FLastLF := False;
FAtTimeout := 1000;
FInterPacketTimeout := True;
end;
destructor TBlockSerial.Destroy;
begin
CloseSocket;
inherited destroy;
end;
class function TBlockSerial.GetVersion: string;
begin
Result := 'SynaSer 7.5.4';
end;
procedure TBlockSerial.CloseSocket;
begin
if Fhandle <> INVALID_HANDLE_VALUE then
begin
Purge;
RTS := False;
DTR := False;
FileClose(FHandle);
end;
if InstanceActive then
begin
{$IFDEF UNIX}
if FLinuxLock then
cpomReleaseComport;
{$ENDIF}
FInstanceActive:= false
end;
Fhandle := INVALID_HANDLE_VALUE;
FComNr:= PortIsClosed;
SetSynaError(sOK);
DoStatus(HR_SerialClose, FDevice);
end;
{$IFDEF WIN32}
function TBlockSerial.GetPortAddr: Word;
begin
Result := 0;
if Win32Platform <> VER_PLATFORM_WIN32_NT then
begin
EscapeCommFunction(FHandle, 10);
asm
MOV @Result, DX;
end;
end;
end;
function TBlockSerial.ReadTxEmpty(PortAddr: Word): Boolean;
begin
Result := True;
if Win32Platform <> VER_PLATFORM_WIN32_NT then
begin
asm
MOV DX, PortAddr;
ADD DX, 5;
IN AL, DX;
AND AL, $40;
JZ @K;
MOV AL,1;
@K: MOV @Result, AL;
end;
end;
end;
{$ENDIF}
procedure TBlockSerial.GetComNr(Value: string);
begin
FComNr := PortIsClosed;
if pos('COM', uppercase(Value)) = 1 then
FComNr := StrToIntdef(copy(Value, 4, Length(Value) - 3), PortIsClosed + 1) - 1;
if pos('/DEV/TTYS', uppercase(Value)) = 1 then
FComNr := StrToIntdef(copy(Value, 10, Length(Value) - 9), PortIsClosed - 1);
end;
procedure TBlockSerial.SetBandwidth(Value: Integer);
begin
MaxSendBandwidth := Value;
MaxRecvBandwidth := Value;
end;
procedure TBlockSerial.LimitBandwidth(Length: Integer; MaxB: integer; var Next: LongWord);
var
x: LongWord;
y: LongWord;
begin
if MaxB > 0 then
begin
y := GetTick;
if Next > y then
begin
x := Next - y;
if x > 0 then
begin
DoStatus(HR_Wait, IntToStr(x));
sleep(x);
end;
end;
Next := GetTick + Trunc((Length / MaxB) * 1000);
end;
end;
procedure TBlockSerial.Config(baud, bits: integer; parity: char; stop: integer;
softflow, hardflow: boolean);
begin
FillChar(dcb, SizeOf(dcb), 0);
GetCommState;
dcb.DCBlength := SizeOf(dcb);
dcb.BaudRate := baud;
dcb.ByteSize := bits;
case parity of
'N', 'n': dcb.parity := 0;
'O', 'o': dcb.parity := 1;
'E', 'e': dcb.parity := 2;
'M', 'm': dcb.parity := 3;
'S', 's': dcb.parity := 4;
end;
dcb.StopBits := stop;
dcb.XonChar := #17;
dcb.XoffChar := #19;
dcb.XonLim := FRecvBuffer div 4;
dcb.XoffLim := FRecvBuffer div 4;
dcb.Flags := dcb_Binary;
if softflow then
dcb.Flags := dcb.Flags or dcb_OutX or dcb_InX;
if hardflow then
dcb.Flags := dcb.Flags or dcb_OutxCtsFlow or dcb_RtsControlHandshake
else
dcb.Flags := dcb.Flags or dcb_RtsControlEnable;
dcb.Flags := dcb.Flags or dcb_DtrControlEnable;
if dcb.Parity > 0 then
dcb.Flags := dcb.Flags or dcb_ParityCheck;
SetCommState;
end;
procedure TBlockSerial.Connect(comport: string);
{$IFDEF MSWINDOWS}
var
CommTimeouts: TCommTimeouts;
{$ENDIF}
begin
// Is this TBlockSerial Instance already busy?
if InstanceActive then {HGJ}
begin {HGJ}
RaiseSynaError(ErrAlreadyInUse);
Exit; {HGJ}
end; {HGJ}
FBuffer := '';
FDevice := comport;
GetComNr(comport);
{$IFDEF MSWINDOWS}
SetLastError (sOK);
{$ELSE}
{$IFNDEF FPC}
SetLastError (sOK);
{$ELSE}
fpSetErrno(sOK);
{$ENDIF}
{$ENDIF}
{$IFNDEF MSWINDOWS}
if FComNr <> PortIsClosed then
FDevice := '/dev/ttyS' + IntToStr(FComNr);
// Comport already owned by another process? {HGJ}
if FLinuxLock then
if not cpomComportAccessible then
begin
RaiseSynaError(ErrAlreadyOwned);
Exit;
end;
{$IFNDEF FPC}
FHandle := THandle(Libc.open(pchar(FDevice), O_RDWR or O_SYNC));
{$ELSE}
FHandle := THandle(fpOpen(FDevice, O_RDWR or O_SYNC));
{$ENDIF}
if FHandle = INVALID_HANDLE_VALUE then //because THandle is not integer on all platforms!
SerialCheck(-1)
else
SerialCheck(0);
{$IFDEF UNIX}
if FLastError <> sOK then
if FLinuxLock then
cpomReleaseComport;
{$ENDIF}
ExceptCheck;
if FLastError <> sOK then
Exit;
{$ELSE}
if FComNr <> PortIsClosed then
FDevice := '\\.\COM' + IntToStr(FComNr + 1);
FHandle := THandle(CreateFile(PChar(FDevice), GENERIC_READ or GENERIC_WRITE,
0, nil, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL or FILE_FLAG_OVERLAPPED, 0));
if FHandle = INVALID_HANDLE_VALUE then //because THandle is not integer on all platforms!
SerialCheck(-1)
else
SerialCheck(0);
ExceptCheck;
if FLastError <> sOK then
Exit;
SetCommMask(FHandle, 0);
SetupComm(Fhandle, FRecvBuffer, 0);
CommTimeOuts.ReadIntervalTimeout := MAXWORD;
CommTimeOuts.ReadTotalTimeoutMultiplier := 0;
CommTimeOuts.ReadTotalTimeoutConstant := 0;
CommTimeOuts.WriteTotalTimeoutMultiplier := 0;
CommTimeOuts.WriteTotalTimeoutConstant := 0;
SetCommTimeOuts(FHandle, CommTimeOuts);
{$IFDEF WIN32}
FPortAddr := GetPortAddr;
{$ENDIF}
{$ENDIF}
SetSynaError(sOK);
if not TestCtrlLine then {HGJ}
begin
SetSynaError(ErrNoDeviceAnswer);
FileClose(FHandle); {HGJ}
{$IFDEF UNIX}
if FLinuxLock then
cpomReleaseComport; {HGJ}
{$ENDIF} {HGJ}
Fhandle := INVALID_HANDLE_VALUE; {HGJ}
FComNr:= PortIsClosed; {HGJ}
end
else
begin
FInstanceActive:= True;