ost_Serial (3)

#include <serial.h>

Inherited by ost::SerialPort, and ost::TTYStream.

Public Types

enum Error { errSuccess = 0, errOpenNoTty, errOpenFailed, errSpeedInvalid, errFlowInvalid, errParityInvalid, errCharsizeInvalid, errStopbitsInvalid, errOptionInvalid, errResourceFailure, errOutput, errInput, errTimeout, errExtended }

enum Flow { flowNone, flowSoft, flowHard, flowBoth }

enum Parity { parityNone, parityOdd, parityEven }

enum Pending { pendingInput, pendingOutput, pendingError }

typedef enum Error Error

typedef enum Flow Flow

typedef enum Parity Parity

typedef enum Pending Pending

Public Member Functions

virtual ~Serial ()

The serial base class may be 'thrown' as a result on an error, and the 'catcher' may then choose to destory the object. Serial & operator= (const Serial &from)

Serial ports may also be duplecated by the assignment operator. Error setSpeed (unsigned long speed)

Set serial port speed for both input and output. Error setCharBits (int bits)

Set character size. Error setParity (Parity parity)

Set parity mode. Error setStopBits (int bits)

Set number of stop bits. Error setFlowControl (Flow flow)

Set flow control. void toggleDTR (timeout_t millisec)

Set the DTR mode off momentarily. void sendBreak (void)

Send the 'break' signal. Error getErrorNumber (void)

Often used by a 'catch' to fetch the last error of a thrown serial. char * getErrorString (void)

Often used by a 'catch' to fetch the user set error string of a thrown serial. int getBufferSize (void)

Get the 'buffer' size for buffered operations. virtual bool isPending (Pending pend, timeout_t timeout=TIMEOUT_INF)

Get the status of pending operations.

Protected Member Functions

void open (const char *fname)

Opens the serial device. void close (void)

Closes the serial device. virtual int aRead (char *Data, const int Length)

Reads from serial device. virtual int aWrite (const char *Data, const int Length)

Writes to serial device. Error error (Error error, char *errstr=NULL)

This service is used to throw all serial errors which usually occur during the serial constructor. void error (char *err)

This service is used to thow application defined serial errors where the application specific error code is a string. void setError (bool enable)

This method is used to turn the error handler on or off for 'throwing' execptions by manipulating the thrown flag. int setPacketInput (int size, unsigned char btimer=0)

Set packet read mode and 'size' of packet read buffer. int setLineInput (char newline=13, char nl1=0)

Set 'line buffering' read mode and specifies the newline character to be used in seperating line records. void restore (void)

Restore serial device to the original settings at time of open. void flushInput (void)

Used to flush the input waiting queue. void flushOutput (void)

Used to flush any pending output data. void waitOutput (void)

Used to wait until all output has been sent. void endSerial (void)

Used as the default destructor for ending serial I/O services. void initConfig (void)

Used to initialize a newly opened serial file handle. Serial ()

This allows later ttystream class to open and close a serial device. Serial (const char *name)

A serial object may be constructed from a named file on the file system.

Protected Attributes

HANDLE dev

int bufsize

The Serial class is used as the base for all serial I/O services under APE.

A serial is a system serial port that is used either for line or packet based data input. Serial ports may also be 'streamable' in a derived form.

Common C++ serial I/O classes are used to manage serial devices and implement serial device protocols. From the point of view of Common C++, serial devices are supported by the underlying Posix specified 'termios' call interface.

The serial I/O base class is used to hold a descriptor to a serial device and to provide an exception handling interface for all serial I/O classes. The base class is also used to specify serial I/O properties such as communication speed, flow control, data size, and parity. The 'Serial' base class is not itself directly used in application development, however.

Common C++ Serial I/O is itself divided into two conceptual modes; frame oriented and line oriented I/O. Both frame and line oriented I/O makes use of the ability of the underlying tty driver to buffer data and return 'ready' status from when select either a specified number of bytes or newline record has been reached by manipulating termios c_cc fields appropriately. This provides some advantage in that a given thread servicing a serial port can block and wait rather than have to continually poll or read each and every byte as soon as it appears at the serial port.

Author:

David Sugar [email protected] base class for all serial I/O services.

typedef enum \fBError\fP \fBost::Serial::Error\fP

typedef enum \fBFlow\fP \fBost::Serial::Flow\fP

typedef enum \fBParity\fP \fBost::Serial::Parity\fP

typedef enum \fBPending\fP \fBost::Serial::Pending\fP

enum \fBost::Serial::Error\fP

Enumerator

errSuccess

errOpenNoTty

errOpenFailed

errSpeedInvalid

errFlowInvalid

errParityInvalid

errCharsizeInvalid

errStopbitsInvalid

errOptionInvalid

errResourceFailure

errOutput

errInput

errTimeout

errExtended

enum \fBost::Serial::Flow\fP

Enumerator

flowNone

flowSoft

flowHard

flowBoth

enum \fBost::Serial::Parity\fP

Enumerator

parityNone

parityOdd

parityEven

enum \fBost::Serial::Pending\fP

Enumerator

pendingInput

pendingOutput

pendingError

ost::Serial::Serial ()\fC [inline]\fP, \fC [protected]\fP

This allows later ttystream class to open and close a serial device.

ost::Serial::Serial (const char *name)\fC [protected]\fP

A serial object may be constructed from a named file on the file system. This named device must be 'isatty()'.

Parameters:

name of file.

virtual ost::Serial::~Serial ()\fC [virtual]\fP

The serial base class may be 'thrown' as a result on an error, and the 'catcher' may then choose to destory the object. By assuring the socket base class is a virtual destructor, we can assure the full object is properly terminated.

virtual int ost::Serial::aRead (char *Data, const intLength)\fC [protected]\fP, \fC [virtual]\fP

Reads from serial device.

Parameters:

Data Point to character buffer to receive data. Buffers MUST be at least Length + 1 bytes in size.

Length Number of bytes to read.

virtual int ost::Serial::aWrite (const char *Data, const intLength)\fC [protected]\fP, \fC [virtual]\fP

Writes to serial device.

Parameters:

Data Point to character buffer containing data to write. Buffers MUST

Length Number of bytes to write.

void ost::Serial::close (void)\fC [protected]\fP

Closes the serial device.

void ost::Serial::endSerial (void)\fC [protected]\fP

Used as the default destructor for ending serial I/O services. It will restore the port to it's original state.

\fBError\fP ost::Serial::error (\fBError\fPerror, char *errstr = \fCNULL\fP)\fC [protected]\fP

This service is used to throw all serial errors which usually occur during the serial constructor.

Parameters:

error defined serial error id.

errstr string or message to optionally pass.

void ost::Serial::error (char *err)\fC [inline]\fP, \fC [protected]\fP

This service is used to thow application defined serial errors where the application specific error code is a string.

Parameters:

err string or message to pass.

References ost::error().

void ost::Serial::flushInput (void)\fC [protected]\fP

Used to flush the input waiting queue.

void ost::Serial::flushOutput (void)\fC [protected]\fP

Used to flush any pending output data.

int ost::Serial::getBufferSize (void)\fC [inline]\fP

Get the 'buffer' size for buffered operations. This can be used when setting packet or line read modes to determine how many bytes to wait for in a given read call.

Returns:

number of bytes used for buffering.

\fBError\fP ost::Serial::getErrorNumber (void)\fC [inline]\fP

Often used by a 'catch' to fetch the last error of a thrown serial.

Returns:

error numbr of last Error.

char* ost::Serial::getErrorString (void)\fC [inline]\fP

Often used by a 'catch' to fetch the user set error string of a thrown serial.

Returns:

string for error message.

void ost::Serial::initConfig (void)\fC [protected]\fP

Used to initialize a newly opened serial file handle. You should set serial properties and DTR manually before first use.

virtual bool ost::Serial::isPending (\fBPending\fPpend, \fBtimeout_t\fPtimeout = \fC\fBTIMEOUT_INF\fP\fP)\fC [virtual]\fP

Get the status of pending operations. This can be used to examine if input or output is waiting, or if an error has occured on the serial device.

Returns:

true if ready, false if timeout.

Parameters:

pend ready check to perform.

timeout in milliseconds.

Reimplemented in ost::TTYStream.

void ost::Serial::open (const char *fname)\fC [protected]\fP

Opens the serial device.

Parameters:

fname Pathname of device to open

\fBSerial\fP& ost::Serial::operator= (const \fBSerial\fP &from)

Serial ports may also be duplecated by the assignment operator.

void ost::Serial::restore (void)\fC [protected]\fP

Restore serial device to the original settings at time of open.

void ost::Serial::sendBreak (void)

Send the 'break' signal.

\fBError\fP ost::Serial::setCharBits (intbits)

Set character size.

Returns:

0 on success.

Parameters:

bits character size to use (usually 7 or 8).

void ost::Serial::setError (boolenable)\fC [inline]\fP, \fC [protected]\fP

This method is used to turn the error handler on or off for 'throwing' execptions by manipulating the thrown flag.

Parameters:

enable true to enable handler.

\fBError\fP ost::Serial::setFlowControl (\fBFlow\fPflow)

Set flow control.

Returns:

0 on success.

Parameters:

flow control mode.

int ost::Serial::setLineInput (charnewline = \fC13\fP, charnl1 = \fC0\fP)\fC [protected]\fP

Set 'line buffering' read mode and specifies the newline character to be used in seperating line records. isPending can then be used to wait for an entire line of input.

Parameters:

newline newline character.

nl1 EOL2 control character.

Returns:

size of conical input buffer.

int ost::Serial::setPacketInput (intsize, unsigned charbtimer = \fC0\fP)\fC [protected]\fP

Set packet read mode and 'size' of packet read buffer. This sets VMIN to x. VTIM is normally set to '0' so that 'isPending()' can wait for an entire packet rather than just the first byte.

Returns:

actual buffer size set.

Parameters:

size of packet read request.

btimer optional inter-byte data packet timeout.

\fBError\fP ost::Serial::setParity (\fBParity\fPparity)

Set parity mode.

Returns:

0 on success.

Parameters:

parity mode.

\fBError\fP ost::Serial::setSpeed (unsigned longspeed)

Set serial port speed for both input and output.

Returns:

0 on success.

Parameters:

speed to select. 0 signifies modem 'hang up'.

\fBError\fP ost::Serial::setStopBits (intbits)

Set number of stop bits.

Returns:

0 on success.

Parameters:

bits stop bits.

void ost::Serial::toggleDTR (\fBtimeout_t\fPmillisec)

Set the DTR mode off momentarily.

Parameters:

millisec number of milliseconds.

void ost::Serial::waitOutput (void)\fC [protected]\fP

Used to wait until all output has been sent.

int ost::Serial::bufsize\fC [protected]\fP

\fBHANDLE\fP ost::Serial::dev\fC [protected]\fP

bool ost::Serial::linebuf

bool ost::Serial::thrown

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