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GNU GENERAL PUBLIC LICENSE
Version 2, June 1991
Copyright (C) 1989, 1991 Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
Everyone is permitted to copy and distribute verbatim copies
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Also add information on how to contact you by electronic and paper mail.
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Yoyodyne, Inc., hereby disclaims all copyright interest in the program
`Gnomovision' (which makes passes at compilers) written by James Hacker.
<signature of Ty Coon>, 1 April 1989
Ty Coon, President of Vice
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library. If this is what you want to do, use the GNU Lesser General
Public License instead of this License.

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#include <p16f630.inc>
; -----------------------------------------------------------------------
; SNES "In-game reset" (IGR) controller
;
; Copyright (C) 2010 by Maximilian Rehkopf <otakon@gmx.net>
;
; This program is free software; you can redistribute it and/or modify
; it under the terms of the GNU General Public License as published by
; the Free Software Foundation; version 2 of the License only.
;
; This program is distributed in the hope that it will be useful,
; but WITHOUT ANY WARRANTY; without even the implied warranty of
; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
; GNU General Public License for more details.
;
; You should have received a copy of the GNU General Public License
; along with this program; if not, write to the Free Software
; Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
;
; -----------------------------------------------------------------------
;
; This program is designed to run on a PIC 16F630 microcontroller connected
; to the controller port and SNES main board. It allows an SNES to be reset
; and region switched via a standard controller.
;
; pin configuration: (controller port pin) [other connection]
; ,-----_-----.
; +5V (1) |1 14| GND (7)
; Reset out [to CIC pin 8 / SuperCIC pin 13] |2 A5 A0 13| serial data in(4)
; 50/60Hz out [to PPUs] |3 A4 A1 12| latch in(3)
; 50/60Hz in [from SuperCIC pin 12] |4 A3 A2 11| clk in(2)
; LED out - grn |5 C5 C0 10| LED in - grn [from SuperCIC pin 5]
; LED out - red |6 C4 C1 9| LED in - red [from SuperCIC pin 6]
; LED_TYPE in |7 C3 C2 8| SuperCIC present
; `-----------'
;
; Pin 4 should be connected to SuperCIC pin 12 if a SuperCIC is used.
;
; Pin 7 (LED_TYPE) sets the output mode for the LED pins
; (must be tied to either level):
; low = common cathode
; high = common anode (output inverted)
;
; Pin 8 should be connected as follows:
; low = no SuperCIC present
; high = SuperCIC present
;
; controller pin numbering
; ========================
; _______________________________
; | | \
; | (1) (2) (3) (4) | (5) (6) (7) )
; |_________________|_____________/
;
;
; key mapping: L + R + Select + (stream data)
; =============================
; Start Reset (normal) 0xcf 0xcf
; X Reset (6s) 0xdf 0x8f
;
; Y Region 50Hz/PAL 0x9f 0xcf
; A Region 60Hz/NTSC 0xdf 0x4f
; B Region from SuperCIC (SuperCIC only) 0x5f 0xcf
;
; functional description:
; =======================
; Reset (normal): simply resets the console.
; Reset (6s): resets the console for >5s to enter main menu on
; PowerPak and sd2snes.
;
; Region 50Hz/PAL overrides the region to 50Hz/PAL.
; Region 60Hz/NTSC overrides the region to 60Hz/NTSC.
; Region from SuperCIC sets the region according to the input level of
; pin 4 (+5V = 50Hz, 0V = 60Hz). In this mode the
; region is updated constantly.
; This function is only available in SuperCIC mode
; (pin 8 = 5V).
;
; -----------------------------------------------------------------------
; Configuration bits: adapt to your setup and needs
__CONFIG _INTRC_OSC_NOCLKOUT & _WDT_OFF & _PWRTE_OFF & _MCLRE_OFF & _BODEN & _CP_OFF & _CPD_OFF
; -----------------------------------------------------------------------
; relocatable code
PROG CODE
start
banksel PORTA
clrf PORTA
movlw 0x07 ; PORTA2..0 are digital I/O (not connected to comparator)
movwf CMCON
movlw 0x00 ; disable all interrupts
movwf INTCON
banksel TRISA
movlw 0x2f ; in out in in in in
movwf TRISA
movlw 0x0f ; out out in in in in
movwf TRISC
movlw 0x00 ; no pullups
movwf WPUA
movlw 0x80 ; global pullup disable
movwf OPTION_REG
banksel PORTA
bsf PORTA, 5
; tits GTFO
clrf 0x24
btfsc PORTC, 2
bsf 0x24, 1
clrf 0x23
btfss 0x24, 1 ; SuperCIC present?
bsf 0x23, 1 ; then enable passthru
goto doregion_60 ; set defaults
waitforlatch_h ; wait for "latch" to become high
btfss PORTA, 1
goto waitforlatch_h
waitforlatch_l ; wait for "latch" to become low
btfsc PORTA, 1
goto waitforlatch_l
clrf 0x20
clrf 0x21
clrf 0x22
bcf STATUS, C ; clear carry
dl1
movf PORTA, w ;read data bit
rlf 0x20, f ;shift
andlw 0x1
iorwf 0x20, f ;put in data reg
incf 0x22, f ;inc bit count
dl1_wait
btfss PORTA, 2 ;wait for clk=h
goto dl1_wait
btfss 0x22, 3 ;first byte done?
goto dl1
bcf STATUS, C ; clear carry
dl2
movf PORTA, w ;read data bit
rlf 0x21, f ;shift
andlw 0x1
iorwf 0x21, f ;put in data reg
incf 0x22, f ;inc bit count
dl2_wait
btfss PORTA, 2 ;wait for clk=h
goto dl2_wait
btfss 0x22, 4
goto dl2
; check region passthru
btfss 0x23, 1 ; passthru enabled?
goto checkkeys ;
btfsc PORTA, 3
bsf PORTA, 4
btfss PORTA, 3
bcf PORTA, 4
call setleds_passthru
checkkeys
; we now have the first 8 bits in 0x20 and the second 8 bits in 0x21
; 00011111 00011111 = ABXY, Select, L
movlw 0x4f
xorwf 0x21, w
btfsc STATUS, Z
goto group4f
movlw 0x8f
xorwf 0x21, w
btfsc STATUS, Z
goto group8f
movlw 0xcf
xorwf 0x21, w
btfsc STATUS, Z
goto groupcf
goto waitforlatch_h
group4f
movlw 0xdf
xorwf 0x20, w
btfss STATUS, Z
goto waitforlatch_h
goto doregion_60
group8f
movlw 0xdf
xorwf 0x20, w
btfss STATUS, Z
goto waitforlatch_h
btfss 0x24, 1 ; SuperCIC absent?
goto doreset_long ; then do long reset
goto doreset_dbl ; else do dbl reset
groupcf
movlw 0x5f
xorwf 0x20, w
btfsc STATUS, Z
goto doregion_passthru
movlw 0x9f
xorwf 0x20, w
btfsc STATUS, Z
goto doregion_50
movlw 0xcf
xorwf 0x20, w
btfsc STATUS, Z
goto doreset_normal
goto waitforlatch_h
doreset_normal
banksel TRISA
bcf TRISA, 5
banksel PORTA
bsf PORTA, 5
movlw 0x15
call longwait
banksel TRISA
bsf TRISA, 5
banksel PORTA
goto waitforlatch_h
doreset_dbl
banksel TRISA
bcf TRISA, 5
banksel PORTA
bsf PORTA, 5
movlw 0x15
call longwait
banksel TRISA
bsf TRISA, 5
clrw
call longwait
bcf TRISA, 5
movlw 0x15
call longwait
banksel TRISA
bsf TRISA, 5
banksel PORTA
goto waitforlatch_h
doreset_long
banksel TRISA
bcf TRISA, 5
banksel PORTA
bsf PORTA, 5
movlw 0x1e
call superlongwait
banksel TRISA
bsf TRISA, 5
banksel PORTA
goto waitforlatch_h
doregion_50
bsf PORTA, 4
clrf 0x23
call setleds_own
goto waitforlatch_h
doregion_60
bcf PORTA, 4
clrf 0x23
call setleds_own
goto waitforlatch_h
doregion_passthru
clrf 0x23
btfsc 0x24, 1 ; SuperCIC present?
bsf 0x23, 1 ; then enable passthru
goto waitforlatch_h
; --------wait: 3*(W-1)+7 cycles (including call+return). W=0 -> 256!--------
wait
movwf 0x2f
wait0 decfsz 0x2f, f
goto wait0
goto longwait1
; --------wait long: 8+(3*(w-1))+(772*w). W=0 -> 256!--------
longwait
movwf 0x2e
clrw
longwait0
goto wait
longwait1
decfsz 0x2e, f
goto longwait0
return
; --------wait extra long: 8+(3*(w-1))+(198405*w).
superlongwait
movwf 0x2d
clrw
superlongwait0
call longwait
decfsz 0x2d, f
goto superlongwait0
return
setleds
btfss 0x24, 1
goto setleds_own
setleds_passthru
clrw
btfsc PORTC, 0 ; green LED
iorlw 0x20
btfsc PORTC, 1 ; red LED
iorlw 0x10
movwf PORTC
return
setleds_own
movlw 0x20 ; assume green LED
btfss PORTA, 4
movlw 0x10 ; if PORTA.4 is low -> red LED
btfsc PORTC, 3 ; if common anode:
xorlw 0x30 ; invert output
movwf PORTC
return
END

27
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