4-digit 7-segment LCD with degree symbol and colon (HT1621). More...

#include <SegLCD_HT1621_4SegDegree.h>

Inheritance diagram for SegLCD_HT1621_4SegDegree:

Public Member Functions
	SegLCD_HT1621_4SegDegree (uint8_t chipselect, uint8_t data, uint8_t write, uint8_t read=-1)

void	init () override
	Initialize GPIO pins for communication.

void	clear () override
	Clear all visible segments on the display.

void	setCursor (uint8_t row, uint8_t col) override
	Set cursor on exact digit.

void	setDegreeSymbol (bool state, uint8_t index=0)

size_t	write (uint8_t ch) override

Public Member Functions inherited from SegDriver_HT1621
	SegDriver_HT1621 (uint8_t chipselect, uint8_t data, uint8_t write, uint8_t read=-1)
	Constructor for HT1621 segment driver.

void	flush (uint8_t startAddr, uint8_t length) override
	Flush specific range of buffered changes to the display.

virtual void	flush ()
	Flush all buffered changes to the display.

virtual void	flush (uint8_t startAddr, uint8_t length)
	Flush specific range of buffered changes to the display.

Public Member Functions inherited from SegDriver_3Wire
	SegDriver_3Wire (uint8_t chipselect, uint8_t data, uint8_t write, uint8_t read=-1)
	Constructor for 3-wire serial LCD driver.

void	on () override
	Turn the display on.

void	off () override
	Turn the display off.

void	command (uint8_t command) override
	Send command to the controller.

Public Member Functions inherited from SegLCDLib
virtual	~SegLCDLib ()
	Virtual destructor to ensure proper cleanup in derived classes.

void	home ()
	Set cursor to 0, 0 without clear display.

void	initBacklight (int8_t backlightPin, BacklightMode backlightMode=BACKLIGHT_DIGITAL, bool backlightActiveHigh=true)
	Initialize GPIO backlight control.

virtual void	setBacklight (bool state)
	Set backlight state (on/off).

virtual void	setBacklight (int brightness)
	Set backlight brightness (0-255).

void	setAutoFlush (bool enable)
	Enable or disable autoflush mode.

bool	getAutoFlush () const
	Get current autoflush state.

const uint8_t *	getRamBuffer () const
	Get pointer to internal RAM buffer (read-only).

size_t	getRamBufferSize () const
	Get size of internal RAM buffer in bytes.

Private Member Functions
void	_setColon (uint8_t row, uint8_t col, bool state) override
	Virtual method for setting colon.

void	_setDecimal (uint8_t row, uint8_t col, bool state) override
	Virtual method for setting decimal point.

uint8_t	_mapSegments (uint8_t val)

void	_writeSymbols (uint8_t bitnum, bool state)

Static Private Attributes
static constexpr uint8_t	RAM_SIZE = 4

static constexpr uint8_t	DIGITS = 4

static constexpr uint8_t	ADDR_SYMBOLS = 6

static constexpr uint8_t	DECIMAL_MIN_COL = 0

static constexpr uint8_t	DECIMAL_MAX_COL = 1

static constexpr uint8_t	COLON_COL = 1

static constexpr uint8_t	FLAG_COLON_DISPLAYED = 0x01

Additional Inherited Members
Public Types inherited from SegLCDLib
enum	BacklightMode { BACKLIGHT_DIGITAL , BACKLIGHT_PWM }
	Backlight mode for GPIO control. More...

Protected Member Functions inherited from SegDriver_HT1621
void	_setMode (ModeDrive drive=MODE_DRIVE_14, ModeBias bias=MODE_BIAS_13)
	Set the mode of the display.

Protected Member Functions inherited from SegDriver_3Wire
void	_writeRam (uint8_t data, uint8_t address)
	Write single byte to RAM at specified address.

virtual void	_writeRam (uint8_t *data, size_t length, uint8_t address)
	Write multiple bytes to RAM starting at specified address.

virtual void	_sendBits (uint16_t data, uint8_t bitCount=8)
	Send bits to the controller.

Protected Member Functions inherited from SegLCDLib
void	_setFlag (uint8_t mask)
	Set a specific flag bit.

void	_clearFlag (uint8_t mask)
	Clear a specific flag bit.

bool	_isFlagSet (uint8_t mask) const
	Check if a specific flag bit is set.

void	_clearAllFlags ()
	Clear all flags.

bool	_dotWrite (uint8_t ch, int8_t minCol, int8_t maxCol, int8_t ramOffset)
	Write decimal point.

void	_dotClearCur (int8_t minCol, int8_t maxCol)
	Clear current decimal (overwrite).

void	_colonClearIfNotFlagged (uint8_t ch, uint8_t colonCol, uint8_t colonFlag)
	Clear colon if its flag is not set.

void	_allocateBuffer (size_t size)
	Allocate RAM buffer for display data.

void	_writeRamMasked (uint8_t data, uint8_t address, uint8_t mask=0xFF)
	Write to display RAM with nibble-aware masking support.

uint8_t	_get_char_value (char ch)
	Helper method to convert a character to its segment representation.

uint16_t	_get_16char_value (char ch)
	Helper method to convert a character to its 16-segment representation.

Protected Attributes inherited from SegDriver_3Wire
uint8_t	_wr
	Write clock pin for the display.

uint8_t	_rd
	Read clock pin for the display.

uint8_t	_data
	Data pin for the display.

uint8_t	_cs
	Chip select pin for the display.

uint8_t	_maxAddress
	Maximum address for this controller.

Protected Attributes inherited from SegLCDLib
bool	_autoFlush = true
	Autoflush mode enabled flag (default: true for LCD API 1.0 compatibility).

int8_t	_backlightPin = -1
	Backlight GPIO pin (-1 if disabled)

BacklightMode	_backlightMode = BACKLIGHT_DIGITAL
	Backlight mode (DIGITAL or PWM)

bool	_backlightActiveHigh = true
	Backlight active high flag.

uint8_t	_backlightBrightness = 0
	Cached backlight brightness.

uint8_t	_displayFlags = 0
	LEDC channel for old ESP32 Arduino Core (2.0.x)

uint8_t *	_ramBuffer = nullptr
	Dynamic RAM buffer for display data (allocated by derived classes).

size_t	_ramBufferSize = 0
	Size of allocated RAM buffer in bytes.

uint8_t	_cursorRow = 0
	Current Row.

uint8_t	_cursorCol = 0
	Current Column.

Static Protected Attributes inherited from SegLCDLib
static constexpr uint8_t	FLAG_PENDING_DOT = 0x80
	Common flag for decimal handling when RAM offset is 0.

Detailed Description

4-digit 7-segment LCD with degree symbol and colon (HT1621).

Features: degree symbol, colon, decimal points. Integrated HT1621 controller, 3-wire serial protocol.

See also: examples/HT1621/4DigDeg/4DigDeg.ino

Constructor & Destructor Documentation

◆ SegLCD_HT1621_4SegDegree()

SegLCD_HT1621_4SegDegree::SegLCD_HT1621_4SegDegree	(	uint8_t	chipselect,
		uint8_t	data,
		uint8_t	write,
		uint8_t	read = `-1`
	)

Member Function Documentation

◆ _mapSegments()

uint8_t SegLCD_HT1621_4SegDegree::_mapSegments ( uint8_t val )

private

◆ _setColon()

void SegLCD_HT1621_4SegDegree::_setColon	(	uint8_t	row,
		uint8_t	col,
		bool	state
	)

overrideprivatevirtual

Virtual method for setting colon.

Default implementation is empty (no-op).

Reimplemented from SegLCDLib.

◆ _setDecimal()

void SegLCD_HT1621_4SegDegree::_setDecimal	(	uint8_t	row,
		uint8_t	col,
		bool	state
	)

overrideprivatevirtual

Virtual method for setting decimal point.

Each LCD has its own implementation with HW specifics. Default implementation is empty (no-op).

Reimplemented from SegLCDLib.

◆ _writeSymbols()

void SegLCD_HT1621_4SegDegree::_writeSymbols	(	uint8_t	bitnum,
		bool	state
	)

private

◆ clear()

void SegLCD_HT1621_4SegDegree::clear ( )

overridevirtual

Clear all visible segments on the display.

Reimplemented from SegDriver_HT1621.

◆ init()

void SegLCD_HT1621_4SegDegree::init ( )

overridevirtual

Initialize GPIO pins for communication.

Reimplemented from SegDriver_3Wire.

◆ setCursor()

void SegLCD_HT1621_4SegDegree::setCursor	(	uint8_t	row,
		uint8_t	col
	)

overridevirtual

Set cursor on exact digit.

Because LCD API is mainly used for character displays in this segment displays this function will be littlebit confusing. Because most of Segment LCD has only one row, thus this will be like row 0 and column will represent actual digit.

But if there is LCD like T1T2 LCD. Row 0 will be clock part, Row 1 will be T1: part and Row 2 will be T2: part of LCD

Parameters

row	Row, where 0-MAXROWS
col	Column 0-MAXDIGITS in current row

Reimplemented from SegLCDLib.

◆ setDegreeSymbol()

void SegLCD_HT1621_4SegDegree::setDegreeSymbol	(	bool	state,
		uint8_t	index = `0`
	)

◆ write()

size_t SegLCD_HT1621_4SegDegree::write ( uint8_t ch )

overridevirtual

Reimplemented from SegLCDLib.

Field Documentation

◆ ADDR_SYMBOLS

constexpr uint8_t SegLCD_HT1621_4SegDegree::ADDR_SYMBOLS = 6

staticconstexprprivate

◆ COLON_COL

constexpr uint8_t SegLCD_HT1621_4SegDegree::COLON_COL = 1

staticconstexprprivate

◆ DECIMAL_MAX_COL

constexpr uint8_t SegLCD_HT1621_4SegDegree::DECIMAL_MAX_COL = 1

staticconstexprprivate

◆ DECIMAL_MIN_COL

constexpr uint8_t SegLCD_HT1621_4SegDegree::DECIMAL_MIN_COL = 0

staticconstexprprivate

◆ DIGITS

constexpr uint8_t SegLCD_HT1621_4SegDegree::DIGITS = 4

staticconstexprprivate

◆ FLAG_COLON_DISPLAYED

constexpr uint8_t SegLCD_HT1621_4SegDegree::FLAG_COLON_DISPLAYED = 0x01

staticconstexprprivate

◆ RAM_SIZE

constexpr uint8_t SegLCD_HT1621_4SegDegree::RAM_SIZE = 4

staticconstexprprivate

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

src/SegLCD_HT1621_4SegDegree.h
src/SegLCD_HT1621_4SegDegree.cpp

Public Member Functions

Private Member Functions

Static Private Attributes

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

◆ SegLCD_HT1621_4SegDegree()

Member Function Documentation

◆ _mapSegments()

◆ _setColon()

◆ _setDecimal()

◆ _writeSymbols()

◆ clear()

◆ init()

◆ setCursor()

◆ setDegreeSymbol()

◆ write()

Field Documentation

◆ ADDR_SYMBOLS

◆ COLON_COL

◆ DECIMAL_MAX_COL

◆ DECIMAL_MIN_COL

◆ DIGITS

◆ FLAG_COLON_DISPLAYED

◆ RAM_SIZE