Configure the LCD display.
CONFIG LCD = LCDtype
The type of LCD display used. This can be :
40 * 4, 40 * 2, 16 * 1, 16 * 1a, 16 * 2, 16 * 4, 16 * 4, 20 * 2 or 20 * 4 or 40 * 4a
Default 16 * 2 is assumed.
The 16 * 1a LCD display is a special one. It is intended for the display that has the memory organized as 2 lines of 8 characters.
The 40 * 4a LCD display is also a special one. It has two ENABLE lines.
The CONFIG LCDPIN directive must be used to configure the second E line:
CONFIG LCDPIN = PIN , E1 = Pin, E2 = pin, etc.
To select between E1 and E2 you need to set the B register.
Mov b,#0 'selects E1
Mov b,#1 'selects E2
LCD with a constant will work and also with strings.
To call the low level routines :
Mov a,#2 ; code into acc
Mov B,#0 ; or use Mov b,#1
Acall LCD_CONTROL ; call routine
To send data use the low level routine WRITE_LCD instead of LCD_CONTROL
Most LCD routines will work with the 40*4a display but some will fail. In that case you need to use the low level ASM routines as shown above.
REM Sample for normal displays
CONFIG LCD = 40 * 4
LCD "Hello" 'display on LCD
FOURTHLINE 'select line 4
LCD "4" 'display 4