HD44780::Port4b Class Reference

#include <HD44780.hh>

Inheritance diagram for HD44780::Port4b:

Collaboration diagram for HD44780::Port4b:

Public Member Functions
	Port4b (Board::DigitalPin d0=Board::D4, Board::DigitalPin d1=Board::D5, Board::DigitalPin d2=Board::D6, Board::DigitalPin d3=Board::D7, Board::DigitalPin rs=Board::D8, Board::DigitalPin en=Board::D9, Board::DigitalPin bt=Board::D10)
virtual bool	setup ()
virtual void	write4b (uint8_t data)
virtual void	write8b (uint8_t data)
virtual void	set_mode (uint8_t flag)
virtual void	set_backlight (uint8_t flag)
virtual void	write8n (const void *buf, size_t size)

Protected Attributes
OutputPin	m_d0
	Data pin; d0. More...
OutputPin	m_d1
	Data pin; d1. More...
OutputPin	m_d2
	Data pin; d2. More...
OutputPin	m_d3
	Data pin; d3. More...
OutputPin	m_rs
	Register select (0/instruction, 1/data). More...
OutputPin	m_en
	Starts data read/write. More...
OutputPin	m_bt
	Back-light control (0/on, 1/off). More...

Static Protected Attributes
static const uint16_t	SHORT_EXEC_TIME = 32

Detailed Description

HD44780 (LCD-II) Dot Matix Liquid Crystal Display Controller/Driver IO Port. Arduino pins directly to LCD in 4-bit mode.

Circuit

                          HD44780
                      +------------+
(GND)---------------1-|VSS         |
(VCC)---------------2-|VDD         |
                    3-|VO          |
(D8)----------------4-|RS          |
                    5-|RW          |
(D9)----------------6-|EN          |
                    7-|D0          |
                    8-|D1          |
                    9-|D2          |
                   10-|D3          |
(D4/D0)------------11-|D4          |
(D5/D1)------------12-|D5          |
(D6/D2)------------13-|D6          |
(D7/D3)------------14-|D7          |
(VCC)-+------------15-|A           |
      ¡         +--16-|K           |
    [4K7]       |     +------------+
      |         |
(D10)-+-[10K]-|< NPN 9013
(/BT)           v
                |
(GND)-----------+

The default pins are the LCD Keypad Shield.

Limitations

Requires too many pins for ATtinyX5.

Definition at line 350 of file HD44780.hh.

Constructor & Destructor Documentation

HD44780::Port4b::Port4b ( Board::DigitalPin  d0 = Board::D4, Board::DigitalPin  d1 = Board::D5, Board::DigitalPin  d2 = Board::D6, Board::DigitalPin  d3 = Board::D7, Board::DigitalPin  rs = Board::D8, Board::DigitalPin  en = Board::D9, Board::DigitalPin  bt = Board::D10  )

inline

Construct HD44780 4-bit parallel port connected to given command, enable and backlight pin. Data pins are implicit; D4..D7 for Arduino Standard and Mighty. D0..D3 for ATtinyX4. Connect to LCD pins D4..D7.

Parameters

[in]	d0	data pin (Default D4).
[in]	d1	data pin (Default D5).
[in]	d2	data pin (Default D6).
[in]	d3	data pin (Default D7).
[in]	rs	command/data select pin (Default D8).
[in]	en	enable pin (Default D9).
[in]	bt	backlight pin (Default D10).

Definition at line 364 of file HD44780.hh.

Member Function Documentation

void HD44780::Port4b::set_backlight ( uint8_t  flag )

virtual

Set backlight on/off using bt pin.

Parameters

[in]

flag.

Implements HD44780::IO.

Definition at line 71 of file HD44780_Port4b.cpp.

void HD44780::Port4b::set_mode ( uint8_t  flag )

virtual

Set instruction/data mode using given rs pin; zero for instruction, non-zero for data mode.

Parameters

[in]

flag.

Implements HD44780::IO.

Definition at line 65 of file HD44780_Port4b.cpp.

bool HD44780::Port4b::setup ( )

virtual

Initiate 4-bit parallel port. Returns false.

Returns

bool.

Implements HD44780::IO.

Definition at line 26 of file HD44780_Port4b.cpp.

void HD44780::Port4b::write4b ( uint8_t  data )

virtual

Write LSB nibble to display data pins.

Parameters

[in]

data

(4b) to write.

Implements HD44780::IO.

Definition at line 32 of file HD44780_Port4b.cpp.

void HD44780::Port4b::write8b ( uint8_t  data )

virtual

Write byte (8bit) to display.

Parameters

[in]

data

(8b) to write.

Reimplemented from HD44780::IO.

Definition at line 45 of file HD44780_Port4b.cpp.

void HD44780::IO::write8n ( const void *  buf, size_t  size  )

virtualinherited

Write character buffer to display.

Parameters

[in]	buf	pointer to buffer.
[in]	size	number of bytes in buffer.

Reimplemented in ERM1602_5, Adafruit_I2C_LCD_Backpack, DFRobot_IIC_LCD_Module, MJKDZ_LCD_Module, and SainSmart_LCD2004.

Definition at line 31 of file HD44780_IO.cpp.

Member Data Documentation

OutputPin HD44780::Port4b::m_bt

protected

Back-light control (0/on, 1/off).

Definition at line 426 of file HD44780.hh.

OutputPin HD44780::Port4b::m_d0

protected

Data pin; d0.

Definition at line 420 of file HD44780.hh.

OutputPin HD44780::Port4b::m_d1

protected

Data pin; d1.

Definition at line 421 of file HD44780.hh.

OutputPin HD44780::Port4b::m_d2

protected

Data pin; d2.

Definition at line 422 of file HD44780.hh.

OutputPin HD44780::Port4b::m_d3

protected

Data pin; d3.

Definition at line 423 of file HD44780.hh.

OutputPin HD44780::Port4b::m_en

protected

Starts data read/write.

Definition at line 425 of file HD44780.hh.

OutputPin HD44780::Port4b::m_rs

protected

Register select (0/instruction, 1/data).

Definition at line 424 of file HD44780.hh.

const uint16_t HD44780::Port4b::SHORT_EXEC_TIME = 32

staticprotected

Execution time delay (us).

Definition at line 418 of file HD44780.hh.

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

• libraries/HD44780/HD44780.hh
• libraries/HD44780/HD44780_Port4b.cpp