Package com.diozero.devices

Class HD44780Lcd.GpioExpansionLcdConnection

java.lang.Object

com.diozero.devices.HD44780Lcd.GpioExpansionLcdConnection

All Implemented Interfaces:

HD44780Lcd.LcdConnection, AutoCloseable

Direct Known Subclasses:

HD44780Lcd.OutputShiftRegisterLcdConnection, HD44780Lcd.PCF8574LcdConnection, HD44780Lcd.PiFaceCadLcdConnection

Enclosing class:

HD44780Lcd

public abstract static class HD44780Lcd.GpioExpansionLcdConnection
extends Object
implements HD44780Lcd.LcdConnection

For connections via a GPIO expansion board.

Constructor Summary

Constructors

Constructor	Description
GpioExpansionLcdConnection(GpioExpander gpioExpander, int port, boolean dataInHighNibble, int registerSelectBit, int dataReadWriteBit, int enableBit, int backlightBit)

Method Summary

Modifier and Type	Method	Description
void	close()
int	getBacklightBit()	Identify the bit in the byte payload that refers to the backlight control flag 1=on, 0=off.
int	getDataReadWriteBit()	Identify the bit in the byte payload that refers to the read/write flag.
int	getEnableBit()	Identify the bit in the byte payload that refers to the enable flag to start read/write.
int	getRegisterSelectBit()	Identify the bit in the byte payload that refers to the register select flag.
boolean	isDataInHighNibble()	Control whether the data bits in the first or last 4-bits
void	write(byte values)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

GpioExpansionLcdConnection

public GpioExpansionLcdConnection(GpioExpander gpioExpander,
                                  int port,
                                  boolean dataInHighNibble,
                                  int registerSelectBit,
                                  int dataReadWriteBit,
                                  int enableBit,
                                  int backlightBit)

Method Detail

write

public void write(byte values)

Specified by:

write in interface HD44780Lcd.LcdConnection

isDataInHighNibble

public boolean isDataInHighNibble()

Description copied from interface: HD44780Lcd.LcdConnection

Control whether the data bits in the first or last 4-bits

Specified by:

isDataInHighNibble in interface HD44780Lcd.LcdConnection

Returns:

true if the data bits are in the high nibble (bits 4:7)

getRegisterSelectBit

public int getRegisterSelectBit()

Description copied from interface: HD44780Lcd.LcdConnection

Identify the bit in the byte payload that refers to the register select flag. RS=0: Command, RS=1: Data

Specified by:

getRegisterSelectBit in interface HD44780Lcd.LcdConnection

Returns:

the register select flag bit number

getDataReadWriteBit

public int getDataReadWriteBit()

Description copied from interface: HD44780Lcd.LcdConnection

Identify the bit in the byte payload that refers to the read/write flag. Not implemented. R/W=0: Write, R/W=1: Read

Specified by:

getDataReadWriteBit in interface HD44780Lcd.LcdConnection

Returns:

the read/write flag bit number

getEnableBit

public int getEnableBit()

Description copied from interface: HD44780Lcd.LcdConnection

Identify the bit in the byte payload that refers to the enable flag to start read/write. Falling edge triggered

Specified by:

getEnableBit in interface HD44780Lcd.LcdConnection

Returns:

the enable flag bit number

getBacklightBit

public int getBacklightBit()

Description copied from interface: HD44780Lcd.LcdConnection

Identify the bit in the byte payload that refers to the backlight control flag 1=on, 0=off.

Specified by:

getBacklightBit in interface HD44780Lcd.LcdConnection

Returns:

the backlight control bit number

close

public void close()
           throws RuntimeIOException

Specified by:

close in interface AutoCloseable

Specified by:

close in interface HD44780Lcd.LcdConnection

Throws:

RuntimeIOException