DISPLAY

Action

Turn LCD display ON or OFF.

 

 

Syntax

DISPLAY ON | OFF

DISPLAY ON | OFF , CURSOR | NOCURSOR , BLINK | NOBLINK

 

 

Remarks

The display is turned on at power up.

When you use DISPLAY with a single parameter, the compiler will maintain a variable to hold the status of the display. In some cases this can lead to an unexpected result. This depends on the order of how the commands are called.

If you experience this problem, you can use the alternative syntax which demands that all 3 parameters are specified.

This does not use any state variable and will update the LCD command register.

The second syntax is advised to be used.

 

 

 

See also

LCD

 

 

Example

'-----------------------------------------------------------------------------------------
'name : lcd.bas
'copyright : (c) 1995-2005, MCS Electronics
'purpose : demo: LCD, CLS, LOWERLINE, SHIFTLCD, SHIFTCURSOR, HOME
' CURSOR, DISPLAY
'micro : Mega8515
'suited for demo : yes
'commercial addon needed : no
'-----------------------------------------------------------------------------------------
 
$regfile = "m8515.dat" ' specify the used micro
$crystal = 4000000 ' used crystal frequency
$baud = 19200 ' use baud rate
$hwstack = 32 ' default use 32 for the hardware stack
$swstack = 10 ' default use 10 for the SW stack
$framesize = 40 ' default use 40 for the frame space
 
 
$sim
'REMOVE the above command for the real program !!
'$sim is used for faster simulation
 
 
'note : tested in PIN mode with 4-bit
 
'Config Lcdpin = Pin , Db4 = Portb.1 , Db5 = Portb.2 , Db6 = Portb.3 , Db7 = Portb.4 , E = Portb.5 , Rs = Portb.6
Config Lcdpin = Pin , Db4 = Porta.4 , Db5 = Porta.5 , Db6 = Porta.6 , Db7 = Porta.7 , E = Portc.7 , Rs = Portc.6
'These settings are for the STK200 in PIN mode
'Connect only DB4 to DB7 of the LCD to the LCD connector of the STK D4-D7
'Connect the E-line of the LCD to A15 (PORTC.7) and NOT to the E line of the LCD connector
'Connect the RS, V0, GND and =5V of the LCD to the STK LCD connector
 
Rem with the config lcdpin statement you can override the compiler settings
 
 
Dim A As Byte
Config Lcd = 16 * 2 'configure lcd screen
 
 
'other options are 16 * 4 and 20 * 4, 20 * 2 , 16 * 1a
'When you dont include this option 16 * 2 is assumed
'16 * 1a is intended for 16 character displays with split addresses over 2 lines
 
'$LCD = address will turn LCD into 8-bit databus mode
' use this with uP with external RAM and/or ROM
' because it aint need the port pins !
 
Cls 'clear the LCD display
Lcd "Hello world." 'display this at the top line
Wait 1
Lowerline 'select the lower line
Wait 1
Lcd "Shift this." 'display this at the lower line
Wait 1
For A = 1 To 10
Shiftlcd Right 'shift the text to the right
Wait 1 'wait a moment
Next
 
For A = 1 To 10
Shiftlcd Left 'shift the text to the left
Wait 1 'wait a moment
Next
 
Locate 2 , 1 'set cursor position
Lcd "*" 'display this
Wait 1 'wait a moment
 
Shiftcursor Right 'shift the cursor
Lcd "@" 'display this
Wait 1 'wait a moment
 
Home Upper 'select line 1 and return home
Lcd "Replaced." 'replace the text
Wait 1 'wait a moment
 
Cursor Off Noblink 'hide cursor
Wait 1 'wait a moment
Cursor On Blink 'show cursor
Wait 1 'wait a moment
Display Off 'turn display off
Wait 1 'wait a moment
Display On 'turn display on
'-----------------NEW support for 4-line LCD------
Thirdline
Lcd "Line 3"
Fourthline
Lcd "Line 4"
Home Third 'goto home on line three
Home Fourth
Home F 'first letteer also works
Locate 4 , 1 : Lcd "Line 4"
Wait 1
 
'Now lets build a special character
'the first number is the characternumber (0-7)
'The other numbers are the rowvalues
'Use the LCD tool to insert this line
 
Deflcdchar 1 , 225 , 227 , 226 , 226 , 226 , 242 , 234 , 228 ' replace ? with number (0-7)
Deflcdchar 0 , 240 , 224 , 224 , 255 , 254 , 252 , 248 , 240 ' replace ? with number (0-7)
Cls 'select data RAM
Rem it is important that a CLS is following the deflcdchar statements because it will set the controller back in datamode
Lcd Chr(0) ; Chr(1) 'print the special character
 
'----------------- Now use an internal routine ------------
_temp1 = 1 'value into ACC
!rCall _write_lcd 'put it on LCD
End

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