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@ Copyright 2022 Gabriel Jensen.
@ This Source Code Form is subject to the terms of the Mozilla Public License, v. 2.0.
@ If a copy of the MPL was not distributed with this file, You can obtain one at https://mozilla.org/MPL/2.0/.
.syntax unified
.cpu arm7tdmi
.thumb
.globl agbx_flip
.func
.thumb_func
agbx_flip:
ldr r0,.dispcntaddr
ldrh r1,[r0] @ Get the current value of dispcnt.
movs r2,#0b10000
eors r1,r2 @ XOR bit five.
strh r1,[r0] @ Save dispcnt.
movs r0,#0x10
tst r1,r0 @ Check what video bank we should return the address of.
beq .vbnk0
.vbnk1:
ldr r0,.vbnk1addr
bx lr
.vbnk0:
ldr r0,.vbnk0addr
bx lr
.endfunc
.align
.dispcntaddr:
.long 0x4000000
.align
.vbnk0addr:
.long 0x6000000
.align
.vbnk1addr:
.long 0x600A000
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