hit,hd44780

Vendor: Hitachi Ltd.

Note

An implementation of a driver matching this compatible is available in drivers/auxdisplay/auxdisplay_hd44780.c.

Description

Hitachi HD44780 LCD

Properties

Properties not inherited from the base binding file.

Name

Type

Details

mode

int

 
Operating mode of display, 8-bit or 4 for 4-bit mode

This property is required.

Legal values: 4, 8

register-select-gpios

phandle-array

 
GPIO connected to Register Select (RS) of LCD

This property is required.

read-write-gpios

phandle-array

 
Optional GPIO used for selecting read or write mode

enable-gpios

phandle-array

 
GPIO used for enabling commands to be sent

This property is required.

data-bus-gpios

phandle-array

 
Array of GPIOs connected to the DB lines of the display, this must
contain 8 entries ascending from DB0 to DB7, for 4-bit interface
displays, the first 4 must be set as `<0>`

This property is required.

brightness-gpios

phandle-array

 
Optional GPIO used for controlling the brightness (contrast)

backlight-gpios

phandle-array

 
Optional GPIO used for enabling the backlight

line-addresses

uint8-array

 
Array of addresses for each row, will use defaults if not provided.
Default is as per Hitachi HD44780 specification.

Default value: [0, 64, 20, 84]

enable-line-rise-delay-ns

int

 
Delay time (in ns) to wait after enable line rises before setting low.
Default is as per Hitachi HD44780 specification.

Default value: 450

enable-line-fall-delay-ns

int

 
Delay time (in ns) to wait after enable line falls before sending
another command. Default is as per Hitachi HD44780 specification.

Default value: 550

rs-line-delay-ns

int

 
Delay time (in ns) to wait after rs/rw line state has been set up before
sending another command. Default is as per Hitachi HD44780 specification.

Default value: 60

clear-command-delay-us

int

 
Delay time (in us) to wait after issuing a clear command before sending
another command. Default is as per Hitachi HD44780 specification.

Default value: 5000

boot-delay-ms

int

 
Delay time (in ms) to wait at boot time before sending a command (note:
this will delay startup of the whole application by this time, this
should only be used when time is needed for the display device to be
ready before it can be configured which without any delay would cause
the display to not function properly).

columns

int

 
Number of text columns that the display has

This property is required.

rows

int

 
Number of text rows that the display has

This property is required.