This class defines an I/O channel that communicates via a serial port. More...

#include <serchan.h>

Inheritance diagram for PSerialChannel:

Collaboration diagram for PSerialChannel:

Public Member Functions
PBoolean	Close ()
	Close the channel, shutting down the link to the data source. More...

Configuration functions
PBoolean	SetSpeed (DWORD speed)
	Set the speed (baud rate) of the serial channel. More...

DWORD	GetSpeed () const
	Get the speed (baud rate) of the serial channel. More...

PBoolean	SetDataBits (BYTE data)
	Set the data bits (5, 6, 7 or 8) of the serial port. More...

BYTE	GetDataBits () const
	Get the data bits (5, 6, 7 or 8) of the serial port. More...

PBoolean	SetParity (Parity parity)
	Set the parity of the serial port. More...

Parity	GetParity () const
	Get the parity of the serial port. More...

PBoolean	SetStopBits (BYTE stop)
	Set the stop bits (1 or 2) of the serial port. More...

BYTE	GetStopBits () const
	Get the stop bits (1 or 2) of the serial port. More...

PBoolean	SetInputFlowControl (FlowControl flowControl)
	Set the flow control (handshaking) protocol of the input to the serial port. More...

FlowControl	GetInputFlowControl () const
	Get the flow control (handshaking) protocol of the input to the serial port. More...

PBoolean	SetOutputFlowControl (FlowControl flowControl)
	Set the flow control (handshaking) protocol of the output to the serial port. More...

FlowControl	GetOutputFlowControl () const
	Get the flow control (handshaking) protocol of the output from the serial port. More...

virtual void	SaveSettings (PConfig &cfg)
	Save the current port settings into the configuration file. More...

Status functions
void	SetDTR (PBoolean state=true)
	Set the Data Terminal Ready signal of the serial port. More...

void	ClearDTR ()
	Clear the Data Terminal Ready signal of the serial port. More...

void	SetRTS (PBoolean state=true)
	Set the Request To Send signal of the serial port. More...

void	ClearRTS ()
	Clear the Request To Send signal of the serial port. More...

void	SetBreak (PBoolean state=true)
	Set the break condition of the serial port. More...

void	ClearBreak ()
	Clear the break condition of the serial port. More...

PBoolean	GetCTS ()
	Get the Clear To Send signal of the serial port. More...

PBoolean	GetDSR ()
	Get the Data Set Ready signal of the serial port. More...

PBoolean	GetDCD ()
	Get the Data Carrier Detect signal of the serial port. More...

PBoolean	GetRing ()
	Get the Ring Indicator signal of the serial port. More...

Public Member Functions inherited from PChannel
PBoolean	SetErrorValues (Errors errorCode, int osError, ErrorGroup group=LastGeneralError)
	Set error values to those specified. More...

virtual Comparison	Compare (const PObject &obj) const
	Get the relative rank of the two strings. More...

virtual PINDEX	HashFunction () const
	Calculate a hash value for use in sets and dictionaries. More...

virtual PBoolean	IsOpen () const
	Determine if the channel is currently open. More...

virtual PString	GetName () const
	Get the platform and I/O channel type name of the channel. More...

virtual P_INT_PTR	GetHandle () const
	Get the integer operating system handle for the channel. More...

FILE *	FDOpen (const char *mode)
	Re-open the device using the stdio library. More...

virtual PChannel *	GetBaseReadChannel () const
	Get the base channel of channel indirection using PIndirectChannel. More...

virtual PChannel *	GetBaseWriteChannel () const
	Get the base channel of channel indirection using PIndirectChannel. More...

void	SetReadTimeout (const PTimeInterval &time)
	Set the timeout for read operations. More...

PTimeInterval	GetReadTimeout () const
	Get the timeout for read operations. More...

virtual PBoolean	Read (void *buf, PINDEX len)
	Low level read from the channel. More...

PINDEX	GetLastReadCount () const
	Get the number of bytes read by the last Read() call. More...

virtual int	ReadChar ()
	Read a single character from the channel. More...

PBoolean	ReadBlock (void *buf, PINDEX len)
	Read len bytes into the buffer from the channel. More...

PString	ReadString (PINDEX len)
	Read `len` character into a string from the channel. More...

void	SetWriteTimeout (const PTimeInterval &time)
	Set the timeout for write operations to complete. More...

PTimeInterval	GetWriteTimeout () const
	Get the timeout for write operations to complete. More...

virtual PBoolean	Write (const void *buf, PINDEX len)
	Low level write to the channel. More...

virtual PBoolean	Write (const void buf, PINDEX len, const void )
	Low level write to the channel with marker. More...

virtual PINDEX	GetLastWriteCount () const
	Get the number of bytes written by the last Write() call. More...

PBoolean	WriteChar (int c)
	Write a single character to the channel. More...

PBoolean	WriteString (const PString &str)
	Write a string to the channel. More...

	~PChannel ()
	Close down the channel. More...

Errors	GetErrorCode (ErrorGroup group=NumErrorGroups) const
	Get normalised error code. More...

int	GetErrorNumber (ErrorGroup group=NumErrorGroups) const
	Get OS errro code. More...

virtual PString	GetErrorText (ErrorGroup group=NumErrorGroups) const
	Get error message description. More...

virtual bool	ReadAsync (AsyncContext &context)
	Begin an asynchronous read from channel. More...

virtual void	OnReadComplete (AsyncContext &context)
	User callback function for when a `ReadAsync()` call has completed or timed out. More...

virtual bool	WriteAsync (AsyncContext &context)
	Begin an asynchronous write from channel. More...

virtual void	OnWriteComplete (AsyncContext &context)
	User callback function for when a WriteAsync() call has completed or timed out. More...

virtual PBoolean	Shutdown (ShutdownValue option)
	Close one or both of the data streams associated with a channel. More...

virtual bool	SetLocalEcho (bool localEcho)
	Set local echo mode. More...

virtual bool	FlowControl (const void *flowData)
	Flow Control information Pass data to the channel for flowControl determination. More...

PBoolean	SetBufferSize (PINDEX newSize)
	Set the iostream buffer size for reads and writes. More...

PBoolean	SendCommandString (const PString &command)
	Send a command meta-string. More...

void	AbortCommandString ()
	Abort a command string that is in progress. More...

Public Member Functions inherited from PObject
unsigned	GetTraceContextIdentifier () const
	Get PTRACE context identifier. More...

void	SetTraceContextIdentifier (unsigned id)

void	GetTraceContextIdentifier (PObject &obj)

void	GetTraceContextIdentifier (PObject *obj)

void	SetTraceContextIdentifier (const PObject &obj)

void	SetTraceContextIdentifier (const PObject *obj)

virtual	~PObject ()

virtual PObject *	Clone () const
	Create a copy of the class on the heap. More...

template<class CLS >
CLS *	CloneAs () const
	As for Clone() but converts to specified type. More...

virtual const char *	GetClass (unsigned ancestor=0) const
	Get the current dynamic type of the object instance. More...

PBoolean	IsClass (const char *cls) const

virtual PBoolean	InternalIsDescendant (const char *clsName) const
	Determine if the dynamic type of the current instance is a descendent of the specified class. More...

__inline const PObject *	PTraceObjectInstance () const

virtual Comparison	CompareObjectMemoryDirect (const PObject &obj) const
	Determine the byte wise comparison of two objects. More...

bool	operator== (const PObject &obj) const
	Compare the two objects. More...

bool	operator!= (const PObject &obj) const
	Compare the two objects. More...

bool	operator< (const PObject &obj) const
	Compare the two objects. More...

bool	operator> (const PObject &obj) const
	Compare the two objects. More...

bool	operator<= (const PObject &obj) const
	Compare the two objects. More...

bool	operator>= (const PObject &obj) const
	Compare the two objects. More...

virtual void	PrintOn (ostream &strm) const
	Output the contents of the object to the stream. More...

virtual void	ReadFrom (istream &strm)
	Input the contents of the object from the stream. More...

Construction
enum	Parity { DefaultParity, NoParity, EvenParity, OddParity, MarkParity, SpaceParity }
	Configuration of serial port parity options. More...

enum	FlowControl { DefaultFlowControl, NoFlowControl, XonXoff, RtsCts }
	Configuration of serial port flow control options. More...

	PSerialChannel ()
	Create a new serial channel object, but do not open it. More...

	PSerialChannel (const PString &port, DWORD speed=0, BYTE data=0, Parity parity=DefaultParity, BYTE stop=0, FlowControl inputFlow=DefaultFlowControl, FlowControl outputFlow=DefaultFlowControl)
	Create a serial channal. More...

	PSerialChannel (PConfig &cfg)
	Create a serial channal. More...

	~PSerialChannel ()
	Close the serial channel on destruction. More...

Open functions
virtual PBoolean	Open (const PString &port, DWORD speed=0, BYTE data=0, Parity parity=DefaultParity, BYTE stop=0, FlowControl inputFlow=DefaultFlowControl, FlowControl outputFlow=DefaultFlowControl)
	Open a serial channal. More...

virtual PBoolean	Open (PConfig &cfg)
	Open a serial channal. More...

static PStringList	GetPortNames ()
	Get a list of the available serial ports. More...

Additional Inherited Members
Public Types inherited from PChannel
enum	PXBlockType { PXReadBlock, PXWriteBlock, PXAcceptBlock, PXConnectBlock }

enum	Errors { NoError, NotFound, FileExists, DiskFull, AccessDenied, DeviceInUse, BadParameter, NoMemory, NotOpen, Timeout, Interrupted, BufferTooSmall, Miscellaneous, ProtocolFailure, Unavailable, NumNormalisedErrors }
	Normalised error codes. More...

enum	ErrorGroup { LastReadError, LastWriteError, LastGeneralError, NumErrorGroups }
	Error groups. More...

typedef PNotifierTemplate < PChannel::AsyncContext & >	AsyncNotifier

enum	ShutdownValue { ShutdownRead = 0, ShutdownWrite = 1, ShutdownReadAndWrite = 2 }

Static Public Member Functions inherited from PChannel
static PString	GetErrorText (Errors lastError, int osError=0)
	Get error message description. More...

Static Public Member Functions inherited from PObject
static const char *	Class ()
	Get the name of the class as a C string. More...

static __inline const PObject *	PTraceObjectInstance (const char *)

static __inline const PObject *	PTraceObjectInstance (const PObject *obj)

static Comparison	InternalCompareObjectMemoryDirect (const PObject obj1, const PObject obj2, PINDEX size)
	Internal function caled from CompareObjectMemoryDirect() More...

Protected Member Functions inherited from PChannel
	PChannel (const PChannel &)

PChannel &	operator= (const PChannel &)

virtual PBoolean	ConvertOSError (P_INT_PTR libcReturnValue, ErrorGroup group=LastGeneralError)
	Convert an operating system error into platform independent error. More...

int	ReadCharWithTimeout (PTimeInterval &timeout)
	Read a character with specified timeout. More...

PBoolean	ReceiveCommandString (int nextChar, const PString &reply, PINDEX &pos, PINDEX start)

virtual int	os_errno () const

PBoolean	PXSetIOBlock (PXBlockType type, const PTimeInterval &timeout)

P_INT_PTR	GetOSHandleAsInt () const

int	PXClose ()

	PChannel ()
	Create the channel. More...

Protected Attributes inherited from PChannel
P_INT_PTR	os_handle
	The operating system file handle return by standard open() function. More...

Errors	lastErrorCode [NumErrorGroups+1]
	The platform independant error code. More...

int	lastErrorNumber [NumErrorGroups+1]
	The operating system error number (eg as returned by errno). More...

PINDEX	lastReadCount
	Number of byte last read by the Read() function. More...

PINDEX	lastWriteCount
	Number of byte last written by the Write() function. More...

PTimeInterval	readTimeout
	Timeout for read operations. More...

PTimeInterval	writeTimeout
	Timeout for write operations. More...

PString	channelName
	Name of channel. More...

PMutex	px_threadMutex

PXBlockType	px_lastBlockType

PThread *	px_readThread

PThread *	px_writeThread

PMutex	px_writeMutex

PThread *	px_selectThread [3]

PMutex	px_selectMutex [3]

Friends inherited from PObject

Detailed Description

This class defines an I/O channel that communicates via a serial port.

This is usually an RS-232 port.

Member Enumeration Documentation

enum PSerialChannel::FlowControl

Configuration of serial port flow control options.

Enumerator
DefaultFlowControl	Use the default flow control, ie do not change it.
NoFlowControl	Set the port for no flow control.
XonXoff	Set the port for software or XON/XOFF flow control.
RtsCts	Set the port for hardware or RTS/CTS flow control.

enum PSerialChannel::Parity

Configuration of serial port parity options.

Enumerator
DefaultParity	Use the default parity, ie do not change it.
NoParity	Set the port for no parity bit.
EvenParity	Set the port to generate parity and make it even.
OddParity	Set the port to generate parity and make it odd.
MarkParity	Set the port parity bit to mark only.
SpaceParity	Set the port parity bit to space only.

Constructor & Destructor Documentation

PSerialChannel::PSerialChannel ( )

Create a new serial channel object, but do not open it.

PSerialChannel::PSerialChannel	(	const PString &	port,
		DWORD	speed = `0`,
		BYTE	data = `0`,
		Parity	parity = `DefaultParity`,
		BYTE	stop = `0`,
		FlowControl	inputFlow = `DefaultFlowControl`,
		FlowControl	outputFlow = `DefaultFlowControl`
	)

Create a serial channal.

The channel is opened it on the specified port and with the specified attributes.

Parameters

port	The name of the serial port to connect to. This is a platform dependent string and woiuld rarely be a literal. The static function `GetPortNames()` can be used to find the platforms serial ports.
speed	Serial port speed or baud rate. The actual values possible here are platform dependent, but the standard value of 300, 1200, 2400, 4800, 9600, 19200, 38400 always be legal.
data	Number of data bits for serial port. The actual values possible here are platform dependent, but 7 and 8 should always be legal.
parity	Parity for serial port. The actual values possible here are platform dependent, but `NoParity`, `OddParity` and `EvenParity` should always be legal.
stop	Number of stop bits for serial port. The actual values possible here are platform dependent, but 1 and 2 should always be legal.
inputFlow	Flow control for data from the remote system into this conputer.
outputFlow	Flow control for data from this conputer out to remote system.

PSerialChannel::PSerialChannel ( PConfig & cfg )

Create a serial channal.

The channel is opened using attributes obtained from standard variables in the configuration file. Note that it assumed that the correct configuration file section is already set.

Parameters

cfg	Configuration file to read serial port attributes from.

PSerialChannel::~PSerialChannel ( )

Close the serial channel on destruction.

Member Function Documentation

void PSerialChannel::ClearBreak ( )

Clear the break condition of the serial port.

This is equivalent to SetBreak(false).

void PSerialChannel::ClearDTR ( )

Clear the Data Terminal Ready signal of the serial port.

This is equivalent to SetDTR(false).

void PSerialChannel::ClearRTS ( )

Clear the Request To Send signal of the serial port.

This is equivalent to SetRTS(false).

PBoolean PSerialChannel::Close ( )

virtual

Close the channel, shutting down the link to the data source.

Returns: true if the channel successfully closed.

Reimplemented from PChannel.

PBoolean PSerialChannel::GetCTS ( )

Get the Clear To Send signal of the serial port.

Returns: true if the CTS signal is asserted.

BYTE PSerialChannel::GetDataBits ( ) const

Get the data bits (5, 6, 7 or 8) of the serial port.

Returns: current setting.

PBoolean PSerialChannel::GetDCD ( )

Get the Data Carrier Detect signal of the serial port.

Returns: true if the DCD signal is asserted.

PBoolean PSerialChannel::GetDSR ( )

Get the Data Set Ready signal of the serial port.

Returns: true if the DSR signal is asserted.

FlowControl PSerialChannel::GetInputFlowControl ( ) const

Get the flow control (handshaking) protocol of the input to the serial port.

Returns: current setting.

FlowControl PSerialChannel::GetOutputFlowControl ( ) const

Get the flow control (handshaking) protocol of the output from the serial port.

Returns: current setting.

Parity PSerialChannel::GetParity ( ) const

Get the parity of the serial port.

Returns: current setting.

static PStringList PSerialChannel::GetPortNames ( )

static

Get a list of the available serial ports.

This returns a set of platform dependent strings which describe the serial ports of the computer. For example under unix it may be "ttyS0", under MS-DOS or NT it would be "COM1" and for the Macintosh it could be "Modem".

Returns: list of strings for possible serial ports.

PBoolean PSerialChannel::GetRing ( )

Get the Ring Indicator signal of the serial port.

Returns: true if the RI signal is asserted.

DWORD PSerialChannel::GetSpeed ( ) const

Get the speed (baud rate) of the serial channel.

Returns: current setting.

BYTE PSerialChannel::GetStopBits ( ) const

Get the stop bits (1 or 2) of the serial port.

Returns: current setting.

virtual PBoolean PSerialChannel::Open	(	const PString &	port,
		DWORD	speed = `0`,
		BYTE	data = `0`,
		Parity	parity = `DefaultParity`,
		BYTE	stop = `0`,
		FlowControl	inputFlow = `DefaultFlowControl`,
		FlowControl	outputFlow = `DefaultFlowControl`
	)

virtual

Open a serial channal.

The channel is opened it on the specified port and with the specified attributes.

Parameters

port	The name of the serial port to connect to. This is a platform dependent string and woiuld rarely be a literal. The static function `GetPortNames()` can be used to find the platforms serial ports.
speed	Serial port speed or baud rate. The actual values possible here are platform dependent, but the standard value of 300, 1200, 2400, 4800, 9600, 19200, 38400 always be legal.
data	Number of data bits for serial port. The actual values possible here are platform dependent, but 7 and 8 should always be legal.
parity	Parity for serial port. The actual values possible here are platform dependent, but `NoParity`, `OddParity` and `EvenParity` should always be legal.
stop	Number of stop bits for serial port. The actual values possible here are platform dependent, but 1 and 2 should always be legal.
inputFlow	Flow control for data from the remote system into this conputer.
outputFlow	Flow control for data from this conputer out to remote system.

virtual PBoolean PSerialChannel::Open ( PConfig & cfg )

virtual

Open a serial channal.

The channel is opened using attributes obtained from standard variables in the configuration file. Note that it assumed that the correct configuration file section is already set.

Parameters

cfg	Configuration file to read serial port attributes from.

virtual void PSerialChannel::SaveSettings ( PConfig & cfg )

virtual

Save the current port settings into the configuration file.

Note that it assumed that the correct configuration file section is already set.

Parameters

cfg	Configuration file to save setting into.

void PSerialChannel::SetBreak ( PBoolean state = true )

Set the break condition of the serial port.

Parameters

state New state of the serial port break condition.

PBoolean PSerialChannel::SetDataBits ( BYTE data )

Set the data bits (5, 6, 7 or 8) of the serial port.

Returns: true if the change was successfully made.

Parameters

data	New number of data bits for serial channel.

void PSerialChannel::SetDTR ( PBoolean state = true )

Set the Data Terminal Ready signal of the serial port.

Parameters

state New state of the DTR signal.

PBoolean PSerialChannel::SetInputFlowControl ( FlowControl flowControl )

Set the flow control (handshaking) protocol of the input to the serial port.

Returns: true if the change was successfully made.

Parameters

flowControl New flow control for serial channel input.

PBoolean PSerialChannel::SetOutputFlowControl ( FlowControl flowControl )

Set the flow control (handshaking) protocol of the output to the serial port.

Returns: true if the change was successfully made.

Parameters

flowControl New flow control for serial channel output.

PBoolean PSerialChannel::SetParity ( Parity parity )

Set the parity of the serial port.

Returns: true if the change was successfully made.

Parameters

parity New parity option for serial channel.

void PSerialChannel::SetRTS ( PBoolean state = true )

Set the Request To Send signal of the serial port.

Parameters

state New state of the RTS signal.

PBoolean PSerialChannel::SetSpeed ( DWORD speed )

Set the speed (baud rate) of the serial channel.

Returns: true if the change was successfully made.

Parameters

speed New speed for serial channel.

PBoolean PSerialChannel::SetStopBits ( BYTE stop )

Set the stop bits (1 or 2) of the serial port.

Returns: true if the change was successfully made.

Parameters

stop	New number of stop bits for serial channel.

The documentation for this class was generated from the following files:

serchan.h

Public Member Functions

Construction

Open functions

Additional Inherited Members

Detailed Description

Member Enumeration Documentation

Constructor & Destructor Documentation

Member Function Documentation