I've been looking through the keypad code from Nigel's tut site () and would like to include it in my program.
My asm is a bit rusty but from going through the code 'KEYS' procedure goes into a loop intul a key is pressed.
In the program I am writing I need to constantly check one of the RA ports for a input so the program cannot loop at the keys subroutine otherwise it will never get to the input checking routine. What I need is something like:
Main
call check_keys
; above routine should return the key pressed in W, otherwise W=0
; if W<>0 Then do something here
call check_ra2
loop Main
How do I go about getting the keypad routine to not loop until a key is pressed?
My asm is a bit rusty but from going through the code 'KEYS' procedure goes into a loop intul a key is pressed.
In the program I am writing I need to constantly check one of the RA ports for a input so the program cannot loop at the keys subroutine otherwise it will never get to the input checking routine. What I need is something like:
Main
call check_keys
; above routine should return the key pressed in W, otherwise W=0
; if W<>0 Then do something here
call check_ra2
loop Main
How do I go about getting the keypad routine to not loop until a key is pressed?