$LCD
From MCS Wiki AVR
Contents |
Action
Instruct the compiler to generate code for 8-bit LCD displays attached to the data bus.
Syntax
$LCD = [&H]address
Remarks
Address |
The address where must be written to, to enable the LCD display and the RS line of the LCD display.
The db0-db7 lines of the LCD must be connected to the data lines D0-D7. (or is 4 bit mode, connect only D4-D7) The RS line of the LCD can be configured with the LCDRS statement.
On systems with external RAM, it makes more sense to attach the LCD to the data bus. With an address decoder, you can select the LCD display. |
Do not confuse $LCD with the LCD statement.
The compiler will create a constant named ___LCD_ADR which you could use in an alternative LCD library.
See also
Example
'-------------------------------------------------------------- ' (c) 1995-2005 MCS Electronics '-------------------------------------------------------------- ' file: LCD.BAS ' demo: LCD, CLS, LOWERLINE, SHIFTLCD, SHIFTCURSOR, HOME ' CURSOR, DISPLAY '-------------------------------------------------------------- 'note : tested in bus mode with 4-bit on the STK200 'LCD - STK200 '------------------- 'D4 D4 'D5 D5 'D6 D6 'D7 D7 'WR WR 'E E 'RS RS '+5V +5V 'GND GND 'V0 V0 ' D0-D3 are not connected since 4 bit bus mode is used! 'Config Lcdpin = Pin , Db4 = Portb.1 , Db5 = Portb.2 , Db6 = Portb.3 , Db7 = Portb.4 , E = Portb.5 , Rs = Portb.6 Rem with the config lcdpin statement you can override the compiler settings $regfile = "8515def.dat" $lcd = &HC000 $lcdrs = &H8000 Config Lcdbus = 4 Dim A As Byte Config Lcd = 16 * 2 'configure lcd screen 'other options are 16 * 2 , 16 * 4 and 20 * 4, 20 * 2 , 16 * 1a 'When you dont include this option 16 * 2 is assumed '16 * 1a is intended for 16 character displays with split addresses over 2 lines '$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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