Temperature/humidity LCD with dual rows (PCF85176). More...

#include <SegLCD_PCF85176_TempHum.h>

Inheritance diagram for SegLCD_PCF85176_TempHumidity:

Public Types
enum	UnitFlags : uint8_t { UNIT_DEGREE_C = 0x01 , UNIT_PERCENT = 0x02 }

Public Types inherited from SegDriver_PCx85
enum	ModeStatus { MODE_STATUS_BLANK = 0 , MODE_STATUS_ENABLED = 1 }
	Enable/disable display. More...

enum	BlinkFrequency { BLINK_FREQUENCY_OFF = 0 , BLINK_FREQUENCY_1 = 1 , BLINK_FREQUENCY_2 = 2 , BLINK_FREQUENCY_3 = 3 }
	Set blink frequency. More...

enum	BlinkMode { BLINK_MODE_NORMAL = 0 , BLINK_MODE_ALTRAM = 1 }
	Set blink mode. More...

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

Public Member Functions
	SegLCD_PCF85176_TempHumidity (SegTransportI2C &transport, uint8_t address=DEFAULT_PCX85_I2C_ADDRESS, uint8_t subaddress=DEFAULT_SUBADDRESS)

void	init () override
	Logical display sections that can be targeted by higher-level rendering logic.

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

void	setBatteryLevel (uint8_t value)

void	setSignalLevel (uint8_t value)

void	setUnits (uint8_t units)

void	clearUnits (uint8_t units)

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

size_t	write (uint8_t ch) override

virtual size_t	write (uint8_t)

size_t	write (const char *str)
	Write a null-terminated string to the display.

size_t	write (const char *buffer, size_t size)
	Write a buffer of characters to the display.

Public Member Functions inherited from SegDriver_PCF85176
	SegDriver_PCF85176 (SegTransportI2C &transport, uint8_t address=DEFAULT_PCX85_I2C_ADDRESS, uint8_t subaddress=DEFAULT_SUBADDRESS)
	Constructor for PCF85176 segment driver.

Public Member Functions inherited from SegDriver_PCx85
	SegDriver_PCx85 (SegTransportI2C &transport, uint8_t address, uint8_t subaddress)
	Constructor for PCx85 segment driver.

void	bankSelect (uint8_t input, uint8_t output)
	Select bank for input and output.

void	blink (BlinkFrequency blink=BLINK_FREQUENCY_OFF, BlinkMode mode=BLINK_MODE_NORMAL)
	Set blink frequency and mode.

void	on () override
	Turn the display on.

void	off () override
	Turn the display off.

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

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 SegLCDLib
	SegLCDLib ()=default
	Default constructor.

virtual	~SegLCDLib ()
	Virtual destructor to ensure proper cleanup in derived classes.

	SegLCDLib (const SegLCDLib &)=delete
	Disable copying to keep the RAM buffer uniquely owned.

SegLCDLib &	operator= (const SegLCDLib &)=delete

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

size_t	write (const char *str)
	Write a null-terminated string to the display.

size_t	write (const char *buffer, size_t size)
	Write a buffer of characters to the display.

void	initBacklight (SegBacklight *backlight, BacklightMode backlightMode=BACKLIGHT_DIGITAL)
	Initialize 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	_updateUnits (uint8_t units, bool set)

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

uint8_t	_mapSegments (uint8_t val)

Static Private Attributes
static constexpr uint8_t	ADDR_SIGNAL_BATT = 14

static constexpr uint8_t	ADDR_TEMP_SEGS = 0

static constexpr uint8_t	ADDR_HUM_SEGS = 8

static constexpr uint8_t	RAM_SIZE = 8

static constexpr uint8_t	OFFSET_SIGBATT = 7

static constexpr uint8_t	OFFSET_TEMP = 0

static constexpr uint8_t	OFFSET_HUM = 4

static constexpr uint8_t	FLAG_MINUS_DISPLAYED = 0x01

static constexpr uint8_t	TEMP_DIGITS = 4

static constexpr uint8_t	HUM_DIGITS = 3

static constexpr uint8_t	TEMP_ROW = 0

static constexpr uint8_t	HUM_ROW = 1

static constexpr uint8_t	LABEL_TEMP_COL = TEMP_DIGITS - 1

static constexpr uint8_t	LABEL_HUM_COL = HUM_DIGITS - 1

static constexpr uint8_t	DECIMAL_TOP_MIN_COL = 0

static constexpr uint8_t	DECIMAL_TOP_MAX_COL = TEMP_DIGITS - 1

static constexpr uint8_t	DECIMAL_BOTTOM_MIN_COL = 1

static constexpr uint8_t	DECIMAL_BOTTOM_MAX_COL = HUM_DIGITS - 1

static constexpr int8_t	DECIMAL_COL_OFFSET = -1

static constexpr uint8_t	DECIMAL_POINT_BIT = 0x08

static constexpr uint8_t	LABEL_BIT = 0x08

static constexpr uint8_t	MINUS_SIGN_BIT = 0x08

static constexpr uint8_t	MAX_SIGNAL_BATTERY_LEVEL = 4

static constexpr uint8_t	SIGNAL_BATTERY_MASK_LOW = 0x0F

static constexpr uint8_t	SIGNAL_BATTERY_MASK_HIGH = 0xF0

static constexpr uint8_t	TEMP_LABEL_OFFSET = 6

static constexpr uint8_t	HUM_LABEL_OFFSET = 4

static constexpr uint8_t	SIGNAL_LEVEL_BITS [4] = {0x10, 0x20, 0x40, 0x80}

static constexpr uint8_t	BATTERY_LEVEL_BITS [4] = {8, 4, 2, 1}

Additional Inherited Members
Protected Member Functions inherited from SegDriver_PCF85176
void	_sendCommand (uint8_t command, bool last=true) override

void	_writeRam (uint8_t *data, size_t length, uint8_t address=0) override
	Low-level method to write a data buffer to display RAM.

void	_writeRam (uint8_t data, uint8_t address=0)
	Low-level method to write a single byte to display RAM.

virtual void	_writeRam (uint8_t *data, size_t length, uint8_t address)=0
	Low-level method to write a data buffer to display RAM.

Protected Member Functions inherited from SegDriver_PCx85
void	_setMode (ModeStatus status, ModeDrive drive=MODE_DRIVE_14, ModeBias bias=MODE_BIAS_13)
	Set the mode of the display.

void	_writeRam (uint8_t data, uint8_t address=0)
	Low-level method to write a single byte to display RAM.

virtual void	_writeRam (uint8_t *data, size_t length, uint8_t address)=0
	Low-level method to write a data buffer to display RAM.

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.

virtual void	_setColon (uint8_t, uint8_t, bool)
	Virtual method for setting colon.

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.

void	_writeRam (uint8_t data, uint8_t address=0)
	Low-level method to write a single byte to display RAM.

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_PCx85
SegTransportI2C &	_transport

uint8_t	_address

uint8_t	_subaddress

ModeDrive	_drive

ModeBias	_bias

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

SegBacklight *	_backlight = nullptr
	Backlight implementation (nullptr if disabled)

BacklightMode	_backlightMode = BACKLIGHT_DIGITAL
	Backlight mode (DIGITAL or PWM)

uint8_t	_backlightBrightness = 0
	Cached backlight brightness.

uint8_t	_displayFlags = 0
	Generic flag storage for display-specific state tracking.

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 SegDriver_PCF85176
static constexpr uint8_t	MAX_ADDRESS = 39

static constexpr uint8_t	CMD_LAST_COMMAND = 0x80

Static Protected Attributes inherited from SegDriver_PCx85
static constexpr uint8_t	CMD_MODE = 0x40

static constexpr uint8_t	CMD_DEVICE_SELECT = 0x60

static constexpr uint8_t	CMD_BLINK = 0x70

static constexpr uint8_t	CMD_BANK_SELECT = 0x78

static constexpr uint8_t	DEFAULT_PCX85_I2C_ADDRESS = 0x38

static constexpr uint8_t	DEFAULT_SUBADDRESS = 0x00

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

Temperature/humidity LCD with dual rows (PCF85176).

Row 0: Temperature, Row 1: Humidity. Features C and % symbols. I2C interface (SA0 pin sets address, A0-A2 are subaddresses).

See also: examples/PCF85176/TempHumidity/TempHumidity.ino

Member Enumeration Documentation

◆ UnitFlags

enum SegLCD_PCF85176_TempHumidity::UnitFlags : uint8_t

Enumerator
UNIT_DEGREE_C
UNIT_PERCENT

Constructor & Destructor Documentation

◆ SegLCD_PCF85176_TempHumidity()

SegLCD_PCF85176_TempHumidity::SegLCD_PCF85176_TempHumidity	(	SegTransportI2C &	transport,
		uint8_t	address = `DEFAULT_PCX85_I2C_ADDRESS`,
		uint8_t	subaddress = `DEFAULT_SUBADDRESS`
	)

Member Function Documentation

◆ _mapSegments()

uint8_t SegLCD_PCF85176_TempHumidity::_mapSegments ( uint8_t val )

private

◆ _setDecimal()

void SegLCD_PCF85176_TempHumidity::_setDecimal	(	uint8_t	,
		uint8_t	,
		bool
	)

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.

◆ _updateUnits()

void SegLCD_PCF85176_TempHumidity::_updateUnits	(	uint8_t	units,
		bool	set
	)

private

◆ clear()

void SegLCD_PCF85176_TempHumidity::clear ( )

overridevirtual

Clear all visible segments on the display.

Reimplemented from SegLCDLib.

◆ clearUnits()

void SegLCD_PCF85176_TempHumidity::clearUnits ( uint8_t units )

◆ init()

void SegLCD_PCF85176_TempHumidity::init ( )

overridevirtual

Logical display sections that can be targeted by higher-level rendering logic.

Initialize the display driver, clear display and set position to 0,0.

Reimplemented from SegDriver_PCx85.

◆ setBatteryLevel()

void SegLCD_PCF85176_TempHumidity::setBatteryLevel ( uint8_t value )

◆ setCursor()

void SegLCD_PCF85176_TempHumidity::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.

◆ setSignalLevel()

void SegLCD_PCF85176_TempHumidity::setSignalLevel ( uint8_t value )

◆ setUnits()

void SegLCD_PCF85176_TempHumidity::setUnits ( uint8_t units )

◆ write() [1/4]

size_t SegLCDLib::write	(	const char *	buffer,
		size_t	size
	)

Write a buffer of characters to the display.

Parameters

buffer	Character buffer (not required to be null-terminated)
size	Number of characters to write

Returns: Number of characters written

◆ write() [2/4]

size_t SegLCDLib::write ( const char * str )

Write a null-terminated string to the display.

Available identically under Arduino and non-Arduino frameworks (ESP-IDF, RP2040 SDK, STM32...). Internally forwards each character to write(uint8_t).

Parameters

str	Null-terminated C-string

Returns: Number of characters written

◆ write() [3/4]

size_t SegLCD_PCF85176_TempHumidity::write ( uint8_t ch )

overridevirtual

Reimplemented from SegLCDLib.

◆ write() [4/4]

virtual size_t SegLCDLib::write ( uint8_t )

inlinevirtual

Reimplemented from SegLCDLib.

Field Documentation

◆ ADDR_HUM_SEGS

constexpr uint8_t SegLCD_PCF85176_TempHumidity::ADDR_HUM_SEGS = 8

staticconstexprprivate

◆ ADDR_SIGNAL_BATT

constexpr uint8_t SegLCD_PCF85176_TempHumidity::ADDR_SIGNAL_BATT = 14

staticconstexprprivate

◆ ADDR_TEMP_SEGS

constexpr uint8_t SegLCD_PCF85176_TempHumidity::ADDR_TEMP_SEGS = 0

staticconstexprprivate

◆ BATTERY_LEVEL_BITS

constexpr uint8_t SegLCD_PCF85176_TempHumidity::BATTERY_LEVEL_BITS[4] = {8, 4, 2, 1}

staticconstexprprivate

◆ DECIMAL_BOTTOM_MAX_COL

constexpr uint8_t SegLCD_PCF85176_TempHumidity::DECIMAL_BOTTOM_MAX_COL = HUM_DIGITS - 1

staticconstexprprivate

◆ DECIMAL_BOTTOM_MIN_COL

constexpr uint8_t SegLCD_PCF85176_TempHumidity::DECIMAL_BOTTOM_MIN_COL = 1

staticconstexprprivate

◆ DECIMAL_COL_OFFSET

constexpr int8_t SegLCD_PCF85176_TempHumidity::DECIMAL_COL_OFFSET = -1

staticconstexprprivate

◆ DECIMAL_POINT_BIT

constexpr uint8_t SegLCD_PCF85176_TempHumidity::DECIMAL_POINT_BIT = 0x08

staticconstexprprivate

◆ DECIMAL_TOP_MAX_COL

constexpr uint8_t SegLCD_PCF85176_TempHumidity::DECIMAL_TOP_MAX_COL = TEMP_DIGITS - 1

staticconstexprprivate

◆ DECIMAL_TOP_MIN_COL

constexpr uint8_t SegLCD_PCF85176_TempHumidity::DECIMAL_TOP_MIN_COL = 0

staticconstexprprivate

◆ FLAG_MINUS_DISPLAYED

constexpr uint8_t SegLCD_PCF85176_TempHumidity::FLAG_MINUS_DISPLAYED = 0x01

staticconstexprprivate

◆ HUM_DIGITS

constexpr uint8_t SegLCD_PCF85176_TempHumidity::HUM_DIGITS = 3

staticconstexprprivate

◆ HUM_LABEL_OFFSET

constexpr uint8_t SegLCD_PCF85176_TempHumidity::HUM_LABEL_OFFSET = 4

staticconstexprprivate

◆ HUM_ROW

constexpr uint8_t SegLCD_PCF85176_TempHumidity::HUM_ROW = 1

staticconstexprprivate

◆ LABEL_BIT

constexpr uint8_t SegLCD_PCF85176_TempHumidity::LABEL_BIT = 0x08

staticconstexprprivate

◆ LABEL_HUM_COL

constexpr uint8_t SegLCD_PCF85176_TempHumidity::LABEL_HUM_COL = HUM_DIGITS - 1

staticconstexprprivate

◆ LABEL_TEMP_COL

constexpr uint8_t SegLCD_PCF85176_TempHumidity::LABEL_TEMP_COL = TEMP_DIGITS - 1

staticconstexprprivate

◆ MAX_SIGNAL_BATTERY_LEVEL

constexpr uint8_t SegLCD_PCF85176_TempHumidity::MAX_SIGNAL_BATTERY_LEVEL = 4

staticconstexprprivate

◆ MINUS_SIGN_BIT

constexpr uint8_t SegLCD_PCF85176_TempHumidity::MINUS_SIGN_BIT = 0x08

staticconstexprprivate

◆ OFFSET_HUM

constexpr uint8_t SegLCD_PCF85176_TempHumidity::OFFSET_HUM = 4

staticconstexprprivate

◆ OFFSET_SIGBATT

constexpr uint8_t SegLCD_PCF85176_TempHumidity::OFFSET_SIGBATT = 7

staticconstexprprivate

◆ OFFSET_TEMP

constexpr uint8_t SegLCD_PCF85176_TempHumidity::OFFSET_TEMP = 0

staticconstexprprivate

◆ RAM_SIZE

constexpr uint8_t SegLCD_PCF85176_TempHumidity::RAM_SIZE = 8

staticconstexprprivate

◆ SIGNAL_BATTERY_MASK_HIGH

constexpr uint8_t SegLCD_PCF85176_TempHumidity::SIGNAL_BATTERY_MASK_HIGH = 0xF0

staticconstexprprivate

◆ SIGNAL_BATTERY_MASK_LOW

constexpr uint8_t SegLCD_PCF85176_TempHumidity::SIGNAL_BATTERY_MASK_LOW = 0x0F

staticconstexprprivate

◆ SIGNAL_LEVEL_BITS

constexpr uint8_t SegLCD_PCF85176_TempHumidity::SIGNAL_LEVEL_BITS[4] = {0x10, 0x20, 0x40, 0x80}

staticconstexprprivate

◆ TEMP_DIGITS

constexpr uint8_t SegLCD_PCF85176_TempHumidity::TEMP_DIGITS = 4

staticconstexprprivate

◆ TEMP_LABEL_OFFSET

constexpr uint8_t SegLCD_PCF85176_TempHumidity::TEMP_LABEL_OFFSET = 6

staticconstexprprivate

◆ TEMP_ROW

constexpr uint8_t SegLCD_PCF85176_TempHumidity::TEMP_ROW = 0

staticconstexprprivate

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

src/SegLCD_PCF85176_TempHum.h
src/SegLCD_PCF85176_TempHum.cpp

Public Types

Public Member Functions

Private Member Functions

Static Private Attributes

Additional Inherited Members

Detailed Description

Member Enumeration Documentation

◆ UnitFlags

Constructor & Destructor Documentation

◆ SegLCD_PCF85176_TempHumidity()

Member Function Documentation

◆ _mapSegments()

◆ _setDecimal()

◆ _updateUnits()

◆ clear()

◆ clearUnits()

◆ init()

◆ setBatteryLevel()

◆ setCursor()

◆ setSignalLevel()

◆ setUnits()

◆ write() [1/4]

◆ write() [2/4]

◆ write() [3/4]

◆ write() [4/4]

Field Documentation

◆ ADDR_HUM_SEGS

◆ ADDR_SIGNAL_BATT

◆ ADDR_TEMP_SEGS

◆ BATTERY_LEVEL_BITS

◆ DECIMAL_BOTTOM_MAX_COL

◆ DECIMAL_BOTTOM_MIN_COL

◆ DECIMAL_COL_OFFSET

◆ DECIMAL_POINT_BIT

◆ DECIMAL_TOP_MAX_COL

◆ DECIMAL_TOP_MIN_COL

◆ FLAG_MINUS_DISPLAYED

◆ HUM_DIGITS

◆ HUM_LABEL_OFFSET

◆ HUM_ROW

◆ LABEL_BIT

◆ LABEL_HUM_COL

◆ LABEL_TEMP_COL

◆ MAX_SIGNAL_BATTERY_LEVEL

◆ MINUS_SIGN_BIT

◆ OFFSET_HUM

◆ OFFSET_SIGBATT

◆ OFFSET_TEMP

◆ RAM_SIZE

◆ SIGNAL_BATTERY_MASK_HIGH

◆ SIGNAL_BATTERY_MASK_LOW

◆ SIGNAL_LEVEL_BITS

◆ TEMP_DIGITS

◆ TEMP_LABEL_OFFSET

◆ TEMP_ROW