driving multiple 16x2 LCDS
i can purchase 8 16x2 LCD displays for the cost of a 20x4 so that makes me think why can't i drive multiple displays from one chip...
so the idea is that all the data lines, RS and RW lines are all connected together for all displays. it's only the enable lines that have seperate IO lines...
I tried to compile a uber simple test program as follows;
Code:
DEFINE LCD_DREG PORTD ' LCD data port
DEFINE LCD_DBIT 0 ' LCD data starting bit 0 or 4
DEFINE LCD_RSREG PORTE ' LCD register select port
DEFINE LCD_RSBIT 0 ' LCD register select bit
DEFINE LCD_EREG PORTE ' LCD enable port
DEFINE LCD_EBIT 2 ' LCD enable bit
DEFINE LCD_RWREG PORTE ' LCD read/write port
DEFINE LCD_RWBIT 1 ' LCD read/write bit
DEFINE LCD_BITS 8 ' LCD bus size 4 or 8 data bits
DEFINE LCD_LINES 2 ' Number lines on LCD
DEFINE LCD_COMMANDUS 2000 ' LCD Command delay time in us
DEFINE LCD_DATAUS 50 ' LCD Data delay time in us
Main:
Pause 1000
DEFINE LCD_EREG PORTE ' LCD enable port
DEFINE LCD_EBIT 2 ' LCD enable bit
LCDOUT $FE, 1, 2, "LCD 1 line 1"
LCDOUT $FE, $C0, "LCD 1 line 2"
DEFINE LCD_EREG PORTE ' LCD enable port
DEFINE LCD_EBIT 3 ' LCD enable bit
LCDOUT $FE, 1, 2, "LCD 2 line 1"
LCDOUT $FE, $C0, "LCD 2 line 2"
goto main
It doesn't allow me to re-define a define... is their another method i could use to get LCDOUT to use a different enable line?
Thanks
