Control of EW 162 LCD display module

; 8 bits init
;
; wait 15-20 millisec No data should be transferred to or from the display during this time.
;
; RS R/W DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0
; 0 0 0 0 1 1 x x x x Function Set Command: (8-Bit interface)
; BF (BF=R/W !!!)cannot be checked before this command.
;
; wait 5 millisec No data should be transferred to or from the display during this time.
;
; 0 0 0 0 1 1 x x x x Function Set Command: (8-Bit interface)
; BF cannot be checked before this command.
;
; wait 100 mikrosec No data should be transferred to or from the display during this time.
;
; 0 0 0 0 1 1 x x x x Function Set Command: (8-Bit interface)
; After this command is written, BF can be checked.
;
; BF=DB7, which connected to RB3, BF=1 please wait, BF=0, ready
varak
banksel TRISB
bsf TRISB,3 ; change output to input
banksel PORTB
bsf PORTA,7 ; RW
btfsc PORTB,3
goto varak
bcf PORTA,7 ; RW
banksel TRISB
bcf TRISB,3 ; back to output
;
; 0 0 0 0 1 1 N F x x Function Set
; (Interface = 8 bits, Set No. of lines and display font)
;
; 0 0 0 0 0 0 1 0 0 0 Display OFF
; 0 0 0 0 0 0 0 0 0 1 Clear Display
; 0 0 0 0 0 0 0 1 I/D S Entry Mode Set:
; 0 0 0 0 0 0 1 1 C B Display ON (Set C and B for cursor/Blink options.)
;
;Initialization Complete, Display Ready.
;BF should be checked before each of the instructions starting with Display OFF.

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; LCD data 0-1-2-3-4-5-6-7
; 6.bit RB2, 7.bit RB3 7-6-5-4-0-1-2-3
btfsc PARANCS,0
bsf PORTB,7
btfsc PARANCS,1
bsf PORTB,6
btfsc PARANCS,2
bsf PORTB,5
btfsc PARANCS,3
bsf PORTB,4
btfsc PARANCS,4
bsf PORTB,0
btfsc PARANCS,5
bsf PORTB,1
btfsc PARANCS,6
bsf PORTB,2
btfsc PARANCS,7
bsf PORTB,3
return

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