NAME
LibSerial::SerialStreamBuf -
This is the streambuf subclass used by SerialStream.
SYNOPSIS
#include <SerialStreamBuf.h>
Public Types
Enumerations
enum BaudRateEnum { BAUD_50 = SerialPort::BAUD_50, BAUD_75 =
SerialPort::BAUD_75, BAUD_110 = SerialPort::BAUD_110, BAUD_134
= SerialPort::BAUD_134, BAUD_150 = SerialPort::BAUD_150,
BAUD_200 = SerialPort::BAUD_200, BAUD_300 =
SerialPort::BAUD_300, BAUD_600 = SerialPort::BAUD_600,
BAUD_1200 = SerialPort::BAUD_1200, BAUD_1800 =
SerialPort::BAUD_1800, BAUD_2400 = SerialPort::BAUD_2400,
BAUD_4800 = SerialPort::BAUD_4800, BAUD_9600 =
SerialPort::BAUD_9600, BAUD_19200 = SerialPort::BAUD_19200,
BAUD_38400 = SerialPort::BAUD_38400, BAUD_57600 =
SerialPort::BAUD_57600, BAUD_115200 = SerialPort::BAUD_115200,
BAUD_230400 = SerialPort::BAUD_230400, BAUD_DEFAULT =
SerialPort::BAUD_DEFAULT, BAUD_INVALID }
The baud rates currently supported by the SUS-2 general
terminal interface specification.
enum CharSizeEnum { CHAR_SIZE_5 = SerialPort::CHAR_SIZE_5,
CHAR_SIZE_6 = SerialPort::CHAR_SIZE_6, CHAR_SIZE_7 =
SerialPort::CHAR_SIZE_7, CHAR_SIZE_8 =
SerialPort::CHAR_SIZE_8, CHAR_SIZE_DEFAULT =
SerialPort::CHAR_SIZE_DEFAULT, CHAR_SIZE_INVALID }
The allowed values of character sizes that can be used during
the serial communication.
enum ParityEnum { PARITY_EVEN = SerialPort::PARITY_EVEN,
PARITY_ODD = SerialPort::PARITY_ODD, PARITY_NONE =
SerialPort::PARITY_NONE, PARITY_DEFAULT =
SerialPort::PARITY_DEFAULT, PARITY_INVALID }
The allowed values of the parity associated with the serial
port communications.
enum FlowControlEnum { FLOW_CONTROL_HARD =
SerialPort::FLOW_CONTROL_HARD, FLOW_CONTROL_SOFT =
SerialPort::FLOW_CONTROL_SOFT, FLOW_CONTROL_NONE =
SerialPort::FLOW_CONTROL_NONE, FLOW_CONTROL_DEFAULT =
SerialPort::FLOW_CONTROL_DEFAULT, FLOW_CONTROL_INVALID }
The values of the flow control settings for a serial port.
Public Member Functions
Constructors and Destructor
SerialStreamBuf ()
The default constructor.
~SerialStreamBuf ()
The destructor.
Other Public Methods
bool is_open () const
Returns true if a previous call to open() succeeded (returned a
non-null value) and there has been no intervening call to
close.
SerialStreamBuf * open (const std::string filename,
std::ios_base::openmode
mode=std::ios_base::in|std::ios_base::out)
If is_open() != false, returns a null pointer.
SerialStreamBuf * close ()
If is_open() == false, returns a null pointer.
int SetParametersToDefault ()
Initialize the serial communication parameters to their default
values.
const BaudRateEnum SetBaudRate (const BaudRateEnum baudRate)
If is_open() != true, return -1.
const BaudRateEnum BaudRate () const
Return the current baud rate of the serial port.
const CharSizeEnum SetCharSize (const CharSizeEnum charSize)
Set the character size to be used during serial communication.
const CharSizeEnum CharSize () const
Return the character size currently being used for serial
communication.
short SetNumOfStopBits (short numOfStopBits)
Set the number of stop bits used during serial communication.
short NumOfStopBits () const
Get the number of stop bits being used during serial
communication.
const ParityEnum SetParity (const ParityEnum parityType)
Set the parity for serial communication.
const ParityEnum Parity () const
Get the current parity setting for the serial port.
const FlowControlEnum SetFlowControl (const FlowControlEnum
flowControlType)
Use the specified flow control.
const FlowControlEnum FlowControl () const
Return the current flow control setting.
const short SetVMin (short vtime)
Set the minimum number of characters for non-canonical reads.
const short VMin () const
Get the VMIN value for the device.
const short SetVTime (short vtime)
Set character buffer timeout in 10ths of a second.
const short VTime () const
Get the current timeout value for non-canonical reads in
deciseconds.
Static Public Attributes
Public static members.
static const BaudRateEnum DEFAULT_BAUD
The default value of the baud rate of the serial port.
static const CharSizeEnum DEFAULT_CHAR_SIZE
The default value of the character size used during the serial
communication.
static const short DEFAULT_NO_OF_STOP_BITS
The default number of stop bits used.
static const ParityEnum DEFAULT_PARITY
The default parity setting.
static const FlowControlEnum DEFAULT_FLOW_CONTROL
The default flow control setting.
static const short DEFAULT_VMIN
The default character buffer size.
static const short DEFAULT_VTIME
The default character buffer timing.
Protected Member Functions
virtual std::streambuf * setbuf (char_type *, std::streamsize)
Performs an operation that is defined separately for each class
derived from streambuf.
virtual std::streamsize xsgetn (char_type *s, std::streamsize n)
Reads upto n characters from the serial port and returns them
through the character array located at s.
virtual std::streamsize showmanyc ()
Check, wether input is available on the port.
virtual int_type underflow ()
Reads and returns the next character from the associated serial
port if one otherwise returns traits::eof().
virtual int_type uflow ()
Reads and returns the next character from the associated serial
port if one otherwise returns traits::eof().
virtual int_type pbackfail (int_type c=traits_type::eof())
This function is called when a putback of a character fails.
virtual std::streamsize xsputn (const char_type *s, std::streamsize n)
Writes upto n characters from the character sequence at s to the
serial port associated with the buffer.
virtual int_type overflow (int_type c)
Writes the specified character to the associated serial port.
Static Protected Attributes
static const char CTRL_Q = 0x11
Character used to signal that I/O can start while using software
flow control with the serial port.
static const char CTRL_S = 0x13
Character used to signal that I/O should stop while using software
flow control with the serial port.
Private Member Functions
SerialStreamBuf (const SerialStreamBuf &)
SerialStreamBuf & operator= (const SerialStreamBuf &)
int InitializeSerialPort ()
This routine is called by open() in order to initialize some
parameters of the serial port and setting its parameters to default
values.
Private Attributes
char mPutbackChar
We use unbuffered I/O for the serial port.
bool mPutbackAvailable
True if a putback value is available in mPutbackChar.
int mFileDescriptor
The file descriptor associated with the serial port.
Detailed Description
This is the streambuf subclass used by SerialStream.
This subclass takes care of opening the serial port file in the
required modes and providing the corresponding file descriptor to
SerialStream so that various parameters associated with the serial port
can be set. Several features of this streambuf class resemble those of
std::filebuf, however this class it not made a subclass of filebuf
because we need access to the file descriptor associated with the
serial port and the standard filebuf does not provide access to it.
At present, this class uses unbuffered I/O and all calls to setbuf()
will be ignored.
Author:
Author.RS 4 crayzeewulf
Manish P. Pagey
Version:
Id.RS 4 SerialStreamBuf.h,v 1.9 2005-10-17 00:19:12 crayzeewulf Exp
Definition at line 38 of file SerialStreamBuf.h.
Member Enumeration Documentation
enum LibSerial::SerialStreamBuf::BaudRateEnum
The baud rates currently supported by the SUS-2 general terminal
interface specification. Note that B0 is not supported because it is
not really a baud rate (it causes the modem to hang up i.e. drop DTR).
Use the close() method instead.
Deprecated
This enumeration will be removed in revision 0.7.x of libserial. It
is here for backward compatibility with 0.5.x releases. Please use
the corresponding enumeration from SerialPort class instead.
Enumerator:
BAUD_50
BAUD_75
BAUD_110
BAUD_134
BAUD_150
BAUD_200
BAUD_300
BAUD_600
BAUD_1200
BAUD_1800
BAUD_2400
BAUD_4800
BAUD_9600
BAUD_19200
BAUD_38400
BAUD_57600
BAUD_115200
BAUD_230400
BAUD_DEFAULT
BAUD_INVALID
Definition at line 62 of file SerialStreamBuf.h.
enum LibSerial::SerialStreamBuf::CharSizeEnum
The allowed values of character sizes that can be used during the
serial communication. Deprecated
This enumeration is deprecated. It will be removed in version
0.7.0. It is here for backward compatibility with version 0.5.x.
Please use SerialPort::CharacterSize instead.
Enumerator:
CHAR_SIZE_5
CHAR_SIZE_6
CHAR_SIZE_7
CHAR_SIZE_8
CHAR_SIZE_DEFAULT
CHAR_SIZE_INVALID
Definition at line 97 of file SerialStreamBuf.h.
enum LibSerial::SerialStreamBuf::FlowControlEnum
The values of the flow control settings for a serial port. Deprecated
This enumeration has been deprecated and will be removed in version
0.7.0. Please use SerialPort::FlowControl instead.
Enumerator:
FLOW_CONTROL_HARD
FLOW_CONTROL_SOFT
FLOW_CONTROL_NONE
FLOW_CONTROL_DEFAULT
FLOW_CONTROL_INVALID
Invalid flow control setting.
Definition at line 130 of file SerialStreamBuf.h.
enum LibSerial::SerialStreamBuf::ParityEnum
The allowed values of the parity associated with the serial port
communications. Deprecated
This enumeration is deprecated and will be removed in version
0.7.0. Please use SerialPort::Parity instead.
Enumerator:
PARITY_EVEN
PARITY_ODD
PARITY_NONE
PARITY_DEFAULT
PARITY_INVALID
Invalid parity value.
Definition at line 114 of file SerialStreamBuf.h.
Constructor & Destructor Documentation
LibSerial::SerialStreamBuf::SerialStreamBuf () [inline]
The default constructor.
Definition at line 562 of file SerialStreamBuf.h.
LibSerial::SerialStreamBuf::~SerialStreamBuf () [inline]
The destructor.
Definition at line 572 of file SerialStreamBuf.h.
LibSerial::SerialStreamBuf::SerialStreamBuf (const SerialStreamBuf &)
[private]
Member Function Documentation
const BaudRateEnum LibSerial::SerialStreamBuf::BaudRate () const
Return the current baud rate of the serial port. If the baud rate is
not set to a valid value then it returns BAUD_INVALID.
const CharSizeEnum LibSerial::SerialStreamBuf::CharSize () const
Return the character size currently being used for serial
communication.
SerialStreamBuf * LibSerial::SerialStreamBuf::close () [inline]
If is_open() == false, returns a null pointer. If a put area exists,
calls overflow(EOF) to flush characters. Finally it closes the file by
calling std::close(mFileDescriptor) where mFileDescriptor is the value
returned by the last call to open().
For the implementation of the corresponding function in class filebuf,
if the last virtual member function called on *this (between underflow,
overflow, seekoff, and seekpos) was overflow then it calls
a_codecvt.unshift (possible several times) to determine a termination
sequence, inserts those characters and calls overflow(EOF) again.
However, this is not implemented here yet.
Postcondition: is_open() == false
Returns:
this on success, a null pointer otherwise.
Definition at line 597 of file SerialStreamBuf.h.
const FlowControlEnum LibSerial::SerialStreamBuf::FlowControl () const
Return the current flow control setting.
int LibSerial::SerialStreamBuf::InitializeSerialPort () [private]
This routine is called by open() in order to initialize some parameters
of the serial port and setting its parameters to default values.
Returns:
-1 on failure and some other value on success.
bool LibSerial::SerialStreamBuf::is_open () const [inline]
Returns true if a previous call to open() succeeded (returned a non-
null value) and there has been no intervening call to close.
Definition at line 583 of file SerialStreamBuf.h.
short LibSerial::SerialStreamBuf::NumOfStopBits () const
Get the number of stop bits being used during serial communication.
Returns:
The number of stop bits.
SerialStreamBuf* LibSerial::SerialStreamBuf::open (const std::string
filename, std::ios_base::openmode mode =
std::ios_base::in|std::ios_base::out)
If is_open() != false, returns a null pointer. Otherwise, initializes
the streambuf as required. It then opens a file, if possible, whose
name is given as the string filename using the system call
std::open(filename.c_str(), flags). The value of parameter flags is
obtained from the value of the parameter mode. At present, only
ios_base::in, ios_base::out, and (ios_base::in|ios_baseout) make sense
for a serial port and hence all other settings result in the call to
fail. The value of flags is obtained as:
flags = u_flags | O_NOCTTY
where u_flags is obtained from the following table depending on the
value of the parameter mode:
in out u_flags + O_RDONLY + O_WRONLY + + O_RDWR
Returns:
If the open() system call succeeds the method returns this. If the
call fails, then it returns a null pointer.
SerialStreamBuf& LibSerial::SerialStreamBuf::operator= (const
SerialStreamBuf &) [private]
virtual int_type LibSerial::SerialStreamBuf::overflow (int_type c)
[protected, virtual]
Writes the specified character to the associated serial port. Returns:
The character c.
const ParityEnum LibSerial::SerialStreamBuf::Parity () const
Get the current parity setting for the serial port. Returns:
The parity setting for the serial port.
virtual int_type LibSerial::SerialStreamBuf::pbackfail (int_type c =
traits_type::eof()) [protected, virtual]
This function is called when a putback of a character fails. This must
be implemented for unbuffered I/O as all streambuf subclasses are
required to provide putback of at least on character.
const BaudRateEnum LibSerial::SerialStreamBuf::SetBaudRate (const
BaudRateEnum baudRate)
If is_open() != true, return -1. Otherwise, set the baud rate of the
associated serial port. Return the baud rate on success and
BAUD_INVALID on failure.
std::streambuf * LibSerial::SerialStreamBuf::setbuf (char_type *,
std::streamsize) [inline, protected, virtual]
Performs an operation that is defined separately for each class derived
from streambuf. The default behavior is to do nothing if gptr() is non-
null and gptr()!=egptr(). Also, setbuf(0, 0) usually means unbuffered
I/O and setbuf(p, n) means use p[0]...p[n-1] to hold the buffered
characters. In general, this method implements the subclass’s notion of
getting memory for the buffered characters.
In the case of SerialStreamBuf, we want to keep using unbuffered I/O.
Hence, using this method has no effect at present.
Definition at line 590 of file SerialStreamBuf.h.
const CharSizeEnum LibSerial::SerialStreamBuf::SetCharSize (const
CharSizeEnum charSize)
Set the character size to be used during serial communication. It
returns the character size on success and CHAR_SIZE_INVALID on failure.
const FlowControlEnum LibSerial::SerialStreamBuf::SetFlowControl (const
FlowControlEnum flowControlType)
Use the specified flow control.
short LibSerial::SerialStreamBuf::SetNumOfStopBits (short numOfStopBits)
Set the number of stop bits used during serial communication. The only
valid values are 1 and 2.
Parameters:
stop_bits The number of stop bits. (1 or 2).
Returns:
The number of stop bits or -1 on failure.
int LibSerial::SerialStreamBuf::SetParametersToDefault ()
Initialize the serial communication parameters to their default values.
const ParityEnum LibSerial::SerialStreamBuf::SetParity (const ParityEnum
parityType)
Set the parity for serial communication. Parameters:
parity The parity value.
const short LibSerial::SerialStreamBuf::SetVMin (short vtime)
Set the minimum number of characters for non-canonical reads. See VMIN
in man termios(3).
const short LibSerial::SerialStreamBuf::SetVTime (short vtime)
Set character buffer timeout in 10ths of a second. This applies to non-
canonical reads.
virtual std::streamsize LibSerial::SerialStreamBuf::showmanyc ()
[protected, virtual]
Check, wether input is available on the port. If you call
SerialStream::in_avail, this method will be called to check for
available input.
while( serial_port.rdbuf()->in_avail() > 0 ) {
serial_port.get(ch);
...
}
std::streambuf::int_type LibSerial::SerialStreamBuf::uflow () [inline,
protected, virtual]
Reads and returns the next character from the associated serial port if
one otherwise returns traits::eof(). This method is used for unbuffered
I/O while underflow() is called for unbuffered I/O.
Returns:
The next character from the serial port.
Definition at line 628 of file SerialStreamBuf.h.
virtual int_type LibSerial::SerialStreamBuf::underflow () [protected,
virtual]
Reads and returns the next character from the associated serial port if
one otherwise returns traits::eof(). This method is used for buffered
I/O while uflow() is called for unbuffered I/O.
Returns:
The next character from the serial port.
const short LibSerial::SerialStreamBuf::VMin () const
Get the VMIN value for the device. This represents the minimum number
of characters for non-canonical reads.
const short LibSerial::SerialStreamBuf::VTime () const
Get the current timeout value for non-canonical reads in deciseconds.
virtual std::streamsize LibSerial::SerialStreamBuf::xsgetn (char_type * s,
std::streamsize n) [protected, virtual]
Reads upto n characters from the serial port and returns them through
the character array located at s. Returns:
The number of characters actually read from the serial port.
virtual std::streamsize LibSerial::SerialStreamBuf::xsputn (const char_type
* s, std::streamsize n) [protected, virtual]
Writes upto n characters from the character sequence at s to the serial
port associated with the buffer. Returns:
The number of characters that were successfully written to the
serial port.
Member Data Documentation
const char LibSerial::SerialStreamBuf::CTRL_Q = 0x11 [static, protected]
Character used to signal that I/O can start while using software flow
control with the serial port.
Definition at line 426 of file SerialStreamBuf.h.
const char LibSerial::SerialStreamBuf::CTRL_S = 0x13 [static, protected]
Character used to signal that I/O should stop while using software flow
control with the serial port.
Definition at line 432 of file SerialStreamBuf.h.
const BaudRateEnum LibSerial::SerialStreamBuf::DEFAULT_BAUD [static]
The default value of the baud rate of the serial port. Deprecated
Please use SerialPort::BAUD_DEFAULT instead.
Definition at line 153 of file SerialStreamBuf.h.
const CharSizeEnum LibSerial::SerialStreamBuf::DEFAULT_CHAR_SIZE [static]
The default value of the character size used during the serial
communication. Deprecated
Please use SerialPort::CHAR_SIZE_DEFAULT instead.
Definition at line 162 of file SerialStreamBuf.h.
const FlowControlEnum LibSerial::SerialStreamBuf::DEFAULT_FLOW_CONTROL
[static]
The default flow control setting. Deprecated
Please use SerialPort::FLOW_CONTROL_DEFAULT instead.
Definition at line 186 of file SerialStreamBuf.h.
const short LibSerial::SerialStreamBuf::DEFAULT_NO_OF_STOP_BITS [static]
The default number of stop bits used. Deprecated
Please use SerialPort::STOP_BITS_DEFAULT instead.
Definition at line 170 of file SerialStreamBuf.h.
const ParityEnum LibSerial::SerialStreamBuf::DEFAULT_PARITY [static]
The default parity setting. Deprecated
Please use SerialPort::PARITY_DEFAULT instead.
Definition at line 178 of file SerialStreamBuf.h.
const short LibSerial::SerialStreamBuf::DEFAULT_VMIN [static]
The default character buffer size. Deprecated
VMIN and VTIME will not be supported starting from version 0.7.0.
Methods of SerialPort class provide better mechanisms for
implementing read and write timeouts.
Definition at line 196 of file SerialStreamBuf.h.
const short LibSerial::SerialStreamBuf::DEFAULT_VTIME [static]
The default character buffer timing. Deprecated
VMIN and VTIME will not be supported starting from version 0.7.0.
Methods of SerialPort class provide better mechanisms for
implementing read and write timeouts.
Definition at line 206 of file SerialStreamBuf.h.
int LibSerial::SerialStreamBuf::mFileDescriptor [private]
The file descriptor associated with the serial port.
Definition at line 546 of file SerialStreamBuf.h.
bool LibSerial::SerialStreamBuf::mPutbackAvailable [private]
True if a putback value is available in mPutbackChar.
Definition at line 541 of file SerialStreamBuf.h.
char LibSerial::SerialStreamBuf::mPutbackChar [private]
We use unbuffered I/O for the serial port. However, we need to provide
the putback of atleast one character. This character contains the
putback character.
Definition at line 536 of file SerialStreamBuf.h.
Author
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