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Update main.S #2

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78 changes: 78 additions & 0 deletions main.S
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Original file line number Diff line number Diff line change
Expand Up @@ -52,6 +52,9 @@
; r23: Bit Counter for interrupt context


; r25- added register for GBPlayer mode


#include <avr/io.h>

.lcomm id_status, 24 ; reply to 0000 0000 1 (0x00)
Expand Down Expand Up @@ -263,6 +266,75 @@ buildAndSendPacket:
; Test each button/direciton bit from the controller, and set the
; appropriate bytes in response. SNES bits are active low, GC bits are
; active high.

cpi r25, 0x08 ;Hold UP during startup to
breq swap1 ;swap Select, X and Y buttons
cpi r25, 0x04 ;Hold DOWN during startup to
breq swap2 ;rotate Y, B and A buttons on top of previous swap
rjmp noswap
swap1:

ldi r19, (1<<4) ; SNES START
and r19, r9
st z+, r19 ; GC START
ldi r19, (1<<5) ; SNES SELECT
and r19, r9
st z+, r19 ; GC Y
ldi r19, (1<<6) ; SNES Y
and r19, r9
st z+, r19 ; GC X
ldi r19, (1<<7) ; SNES B
and r19, r9
st z+, r19 ; GC B
ldi r19, (1<<7) ; SNES A
and r19, r10
st z+, r19 ; GC A
st z+, r19 ; This is the first bit of the 2nd byte. Always 1

ldi r19, (1<<5) ; SNES L
and r19, r10
st z+, r19 ; GC L
ldi r19, (1<<4) ; SNES R
and r19, r10
st z+, r19 ; GC R
ldi r19, (1<<6) ; SNES X
and r19, r10
st z+, r19 ; GC Z

rjmp ended
swap2:

ldi r19, (1<<4) ; SNES START
and r19, r9
st z+, r19 ; GC START
ldi r19, (1<<5) ; SNES SELECT
and r19, r9
st z+, r19 ; GC Y
ldi r19, (1<<7) ; SNES A
and r19, r10
st z+, r19 ; GC X
ldi r19, (1<<6) ; SNES Y
and r19, r9
st z+, r19 ; GC B
ldi r19, (1<<7) ; SNES B
and r19, r9
st z+, r19 ; GC A
st z+, r19 ; This is the first bit of the 2nd byte. Always 1

ldi r19, (1<<5) ; SNES L
and r19, r10
st z+, r19 ; GC L
ldi r19, (1<<4) ; SNES R
and r19, r10
st z+, r19 ; GC R
ldi r19, (1<<6) ; SNES X
and r19, r10
st z+, r19 ; GC Z

rjmp ended

noswap:

ldi r19, (1<<4) ; SNES START
and r19, r9
st z+, r19 ; GC START
Expand All @@ -289,6 +361,9 @@ buildAndSendPacket:
ldi r19, (1<<5) ; SNES SELECT
and r19, r9
st z+, r19 ; GC Z

ended:

ldi r19, (1<<3) ; SNES UP
and r19, r9
st z+, r19 ; GC UP
Expand Down Expand Up @@ -556,6 +631,9 @@ main:
; doing a NES mode read (this works on an SNES controller
; too) to check the
rcall readNes

mov r25, r4 ;Added functionality by pressing either UP or DOWN
andi r25, 0x0C ;during startup to rotate buttons for GBPlayer

mov r16, r4
andi r16, 0x10
Expand Down