Console (VT100 compatible) via Serial interface. More...

#include <device/serialstream.h>

Inheritance diagram for SerialStream:

Collaboration diagram for SerialStream:

Public Types
enum	Attrib { RESET = 0 , BRIGHT = 1 , DIM = 2 , UNDERSCORE = 4 , BLINK = 5 , REVERSE = 7 , HIDDEN = 8 }
	Attributes can be used to influence the display of the output. More...

enum	Color { BLACK = 0 , RED = 1 , GREEN = 2 , YELLOW = 3 , BLUE = 4 , MAGENTA = 5 , CYAN = 6 , WHITE = 7 }
	Color codes. More...

Public Types inherited from Serial
enum	ComPort { COM1 = 0x3f8 , COM2 = 0x2f8 , COM3 = 0x3e8 , COM4 = 0x2e8 }
	COM-Port. More...

enum	BaudRate { BAUD_300 = 384 , BAUD_600 = 192 , BAUD_1200 = 96 , BAUD_2400 = 48 , BAUD_4800 = 24 , BAUD_9600 = 12 , BAUD_19200 = 6 , BAUD_38400 = 3 , BAUD_57600 = 2 , BAUD_115200 = 1 }
	Transmission speed. More...

enum	DataBits { DATA_5BIT = 0 , DATA_6BIT = 1 , DATA_7BIT = 2 , DATA_8BIT = 3 }
	Number of data bits per character.

enum	StopBits { STOP_1BIT = 0 , STOP_1_5BIT = 4 , STOP_2BIT = 4 }
	Number of stop bits per character.

enum	Parity { PARITY_NONE = 0 , PARITY_ODD = 8 , PARITY_EVEN = 24 , PARITY_MARK = 40 , PARITY_SPACE = 56 }
	parity bit

Public Member Functions
	SerialStream (ComPort port=COM1, BaudRate baud_rate=BAUD_115200, DataBits data_bits=DATA_8BIT, StopBits stop_bits=STOP_1BIT, Parity parity=PARITY_NONE)
	Constructor for the VT100-compatible console. More...

void	flush () override
	Method to output the buffer contents of the base class Stringbuffer. More...

void	setForeground (Color c)
	Change foreground color (for subsequent output) More...

void	setBackground (Color c)
	Change background color (for subsequent output) More...

void	setAttribute (Attrib a)
	Change text attribute (for subsequent output) More...

void	reset ()
	Reset terminal. More...

void	setPos (int x, int y)
	Set the cursor position. More...

bool	getPos (int &x, int &y)
	Read the current cursor position. More...

void	print (char *str, int length)
	Display multiple characters in the window starting at the current cursor position. More...

void	listen (bool active=true)
	Initialize the interrupt driven serial connection. More...

bool	prologue () override
	Prologue for serial receive interrupts. More...

void	epilogue () override
	Epilogue for serial receive interrupts. More...

char	getChar ()
	Application interface to retrieve characters from the serial connection. More...

Public Member Functions inherited from OutputStream
	OutputStream ()
	Default constructor. Initial number system is decimal.

virtual	~OutputStream ()
	Destructor.

virtual void	flush ()=0
	Clears the buffer. More...

OutputStream &	operator<< (char c)
	Print a single character. More...

OutputStream &	operator<< (unsigned char c)
	Print a single character. More...

OutputStream &	operator<< (const char *string)
	Printing a null-terminated string. More...

OutputStream &	operator<< (bool b)
	Print a boolean value. More...

OutputStream &	operator<< (short ival)
	Print an integral number in radix `base` More...

OutputStream &	operator<< (unsigned short ival)
	Print an integral number in radix `base` More...

OutputStream &	operator<< (int ival)
	Print an integral number in radix `base` More...

OutputStream &	operator<< (unsigned int ival)
	Print an integral number in radix `base` More...

OutputStream &	operator<< (long ival)
	Print an integral number in radix `base` More...

OutputStream &	operator<< (unsigned long ival)
	Print an integral number in radix `base` More...

OutputStream &	operator<< (long long ival)
	Print an integral number in radix `base` More...

OutputStream &	operator<< (unsigned long long ival)
	Print an integral number in radix `base` More...

OutputStream &	operator<< (const void *ptr)
	Print a pointer as hexadecimal number. More...

OutputStream &	operator<< (OutputStream &(*f)(OutputStream &))
	Calls one of the manipulator functions. More...

Public Member Functions inherited from Stringbuffer
virtual	~Stringbuffer ()
	Destructor (nothing to do here)

Public Member Functions inherited from Serial
	Serial (ComPort port=COM1, BaudRate baud_rate=BAUD_115200, DataBits data_bits=DATA_8BIT, StopBits stop_bits=STOP_1BIT, Parity parity=PARITY_NONE)
	Constructor. More...

int	read (bool blocking=true)
	Read one byte from the serial interface. More...

int	write (char out, bool blocking=true)
	Write one byte to the serial interface. More...

bool	receiveInterrupt (bool enable)
	Activate or deactivate interrupts on data reception. More...

Public Member Functions inherited from Gate
	Gate ()
	Constructor.

virtual	~Gate ()
	Destructor. More...

virtual bool	prologue ()=0
	Device-specific interrupt handling routine that is executed immediately after the interrupt occurs (asynchronously). More...

virtual void	epilogue ()
	Possibly delayed, synchronously executed Device-specific interrupt handling routine. More...

Protected Attributes
BBuffer< char, 16 >	prologue_chars
	Buffer for incoming characters in prologue.

BBuffer< char, 64 >	epilogue_chars
	Buffer for incoming characters already processed in epilogue.

Semaphore	char_available
	Semaphore to signal an available character.

Protected Attributes inherited from Stringbuffer
char	buffer [80]
	buffer containing characters that will be printed upon flush()

long unsigned	pos
	current position in the buffer

Protected Attributes inherited from Serial
const ComPort	port
	Selected COM port.

Additional Inherited Members
Public Attributes inherited from OutputStream
int	base
	Number system used for printing integral numbers (one of 2, 8, 10, or 16)

Protected Member Functions inherited from Stringbuffer
	Stringbuffer ()
	Constructor; Marks the buffer as empty.

void	put (char c)
	Inserts a character into the buffer. More...

virtual void	flush ()=0
	Flush the buffer contents. More...

Detailed Description

Console (VT100 compatible) via Serial interface.

This class allows to connect a VT100-compatible display terminal via the serial interface.

The utility 'screen' can be used to attach a terminal to an interface at a specified connection speed: screen /dev/ttyS0 115200

Color and position can be adjusted with the help of escape codes.

Member Enumeration Documentation

◆ Attrib

enum SerialStream::Attrib

Attributes can be used to influence the display of the output.

Note: The attributes might not be supported or have a different effect depending on the terminal emulator!

Enumerator
RESET	Turn off character attributes.
BRIGHT	Bold.
DIM	Low intensity (dimmed)
UNDERSCORE	Underline.
BLINK	Blink (slow)
REVERSE	Swap fore & background.
HIDDEN	Concealed.

◆ Color

enum SerialStream::Color

Color codes.

Default VT100 supports eight colors for both foreground and background (later versions 256 [8 bit] and even true color [32 bit]). The actual color is affected by the attributes and can look significantly different depending on the terminal emulator.

Constructor & Destructor Documentation

◆ SerialStream()

SerialStream::SerialStream	(	ComPort	port = `COM1`,
		BaudRate	baud_rate = `BAUD_115200`,
		DataBits	data_bits = `DATA_8BIT`,
		StopBits	stop_bits = `STOP_1BIT`,
		Parity	parity = `PARITY_NONE`
	)

explicit

Constructor for the VT100-compatible console.

Sets up the serial connection as well

Member Function Documentation

◆ flush()

void SerialStream::flush ( )

overridevirtual

Method to output the buffer contents of the base class Stringbuffer.

The method is automatically called when the buffer is full, but can also be called explicitly to force output of the current buffer.

Implements OutputStream.

◆ setForeground()

void SerialStream::setForeground ( Color c )

Change foreground color (for subsequent output)

Parameters

c Color

◆ setBackground()

void SerialStream::setBackground ( Color c )

Change background color (for subsequent output)

Parameters

c Color

◆ setAttribute()

void SerialStream::setAttribute ( Attrib a )

Change text attribute (for subsequent output)

Parameters

a Attribute

◆ reset()

void SerialStream::reset ( )

Reset terminal.

Clear screen, place cursor at the beginning and reset colors and attributes to the default value.

◆ setPos()

void SerialStream::setPos	(	int	x,
		int	y
	)

Set the cursor position.

Parameters

x	Column in window
y	Row in window

◆ getPos()

bool SerialStream::getPos	(	int &	x,
		int &	y
	)

Read the current cursor position.

It is possible to receive the current cursor position via a special escape code: Request by sending \e[6n, answer will be \e[y;xR with y (row) and x (column) as human readable ASCII character number.

However, depending on the implementation, it may be possible that the system waits endlessly due to an disconnected terminal or data transmission error.

Parameters

x	Column in window
y	Row in window

Returns: true if position was successfully received

◆ print()

void SerialStream::print	(	char *	str,
		int	length
	)

Display multiple characters in the window starting at the current cursor position.

This method can be used to output a string, starting at the current cursor position. Since the string does not need to contain a '\0' termination (as it is usually the case in C), the parameter length is required to specify the number of characters in the string.

The text is displayed using the previously configured attributes, fore- and background color.

A line break will occur wherever the character \n is inserted in the text to be output (for compatibility reasons a \r is automatically appended).

Parameters

str	String to output
length	length of string

◆ listen()

void SerialStream::listen ( bool active = true )

Initialize the interrupt driven serial connection.

Only receive interrupts are supported, however, send interrupts could be implemented accordingly: interrupt if line is free/ready.

◆ prologue()

bool SerialStream::prologue ( )

overridevirtual

Prologue for serial receive interrupts.

The received character is placed in a local buffer (e.g. BBuffer) and – on success – an epilogue is requested.

Returns: true if the epilogue has to be executed.

Implements Gate.

◆ epilogue()

void SerialStream::epilogue ( )

overridevirtual

Epilogue for serial receive interrupts.

The receival of a character is signaled to a possibly waiting thread. For this purpose, a semaphore is used whose counter indicates how many characters are available in the buffer.

Reimplemented from Gate.

◆ getChar()

char SerialStream::getChar ( )

Application interface to retrieve characters from the serial connection.

This method returns the last received character. If no character has been received, the calling application thread is blocked until a character is available – this is achieved by using a Semaphore.

Returns: Received character

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

device/serialstream.h
device/serialstream.cc

Public Types

Public Member Functions

Protected Attributes

Additional Inherited Members

Detailed Description

Member Enumeration Documentation

◆ Attrib

◆ Color

Constructor & Destructor Documentation

◆ SerialStream()

Member Function Documentation

◆ flush()

◆ setForeground()

◆ setBackground()

◆ setAttribute()

◆ reset()

◆ setPos()

◆ getPos()

◆ print()

◆ listen()

◆ prologue()

◆ epilogue()

◆ getChar()