Hi Reiner,
It's in the app_lcd.inc file
#ifndef USER_LCD_NUM_ENABLE_LINES
#define USER_LCD_NUM_ENABLE_LINES 8
#endif
#ifndef USER_LCD_LAT_E0
USER_LCD_LAT_E0 EQU LATD ; Pin D.7
#endif
#ifndef USER_LCD_PIN_E0
USER_LCD_PIN_E0 EQU 7
#endif
#ifndef USER_LCD_LAT_E1
USER_LCD_LAT_E1 EQU LATC ; Pin C.5
#endif
#ifndef USER_LCD_PIN_E1
USER_LCD_PIN_E1 EQU 5
#endif
#ifndef USER_LCD_LAT_E2
USER_LCD_LAT_E2 EQU LATC ; Pin C.4
#endif
#ifndef USER_LCD_PIN_E2
USER_LCD_PIN_E2 EQU 4
#endif
I suppose you have to change the number of LCD from 8 to 3
Then change PORT and PIN for the 3 first lines E0 to E2.
I never tried it so I don't know, but I think the first one is selected at startup, so first lcd should work normally.
In your app you have to use USER_LCD_Select to select another LCD.
More information are in the README file
Have a good day!
Bruno