Having had a look in the non firmware keyboard scanning routine:
http://cpcwiki.eu/index.php/Programming:Keyboard_scanning (//http:///index.php/Programming:Keyboard_scanning)
I wonder how to read the input from a joystick (1 or 2)..
Is there a special way to get input from them or are the input also located in the keyboard matrix?
Any help appreciated :)
/CPCLER
afaik joy 1 is on line &49.For joy 2 , i remember getting its state long time ago, it is in keyboard matrix but i can not rememeber where :-\
This is the code i am using, taken from CPCwiki to get joy1 state :
joy_up EQU 1
joy_dn EQU 2
joy_lt EQU 4
joy_rt EQU 8
joy_b1 EQU 16
joy_b2 EQU 32
joy_update:
ld A,#49
call key_update
xor #FF
ld (joy_state),A
ret
; update a key state
; A from 0 to 9 with bdir/bc1=01
; code found @cpcwiki
key_update:
LD BC,#F782 ; PPI port A out /C out
OUT (C),C
LD BC,#F40E ; Select Ay reg 14 on ppi port A
OUT (C),C
LD BC,#F6C0 ; This value is an AY index (R14)
OUT (C),C
db #ED,#71 ;OUT (C),0
LD BC,#F792 ; PPI port A in/C out
OUT (C),C
DEC B
OUT (C),A ; Send KbdLine on reg 14 AY through ppi port A
LD B,#F4 ; Read ppi port A
IN A,(C) ; e.g. AY R14 (AY port A)
LD BC,#F782 ; PPI port A out / C out
OUT (C),C
DEC B ; Reset PPI Write
db #ED,#71 ;OUT (C),0
ret
See http://cpcrulez.free.fr/coding_logon43.htm scheme number 6. J1 & J2 for Joysticks
Quote from: Longshot on 09:15, 17 July 09
See http://cpcrulez.free.fr/coding_logon43.htm (http://cpcrulez.free.fr/coding_logon43.htm) scheme number 6. J1 & J2 for Joysticks
Thanks, this was exactly what i needed. I have also updated the Matrix scheme in the CPCWIKI so i now shows the places for joystick scanning. :)
/CPCLER