LCD

LCD

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Send constant or variable to LCD display.

 

 

Syntax

LCD x

 

 

Remarks

X

Variable or constant to display.

 

More variables can be displayed separated by the ; -sign

 

LCD a ; b1 ; "constant"

 

The LCD statement behaves just like the PRINT statement. So SPC() can be used too.

The only difference with PRINT is that no CR+LF is added when you send data to the LCD.

 

 

See also

$LCD , $LCDRS , CONFIG LCD , SPC , CLS , INITLCD , SHIFTLCD , SHIFTCURSOR , CURSOR , LCDCMD, LCDDATA

 

 

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

REM BETTER USE LCDCMD

End