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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
.extern __ax_getvbnk
.globl ax_flip
.func
.thumb_func
ax_flip:
@ Get the current value of dispcnt:
ldr r0,.dispcntaddr @ ax_i20 dispcntaddr = 0x4000000u;
ldrh r1,[r0] @ ax_i10 dispcnt = *(ax_i10 *)dispcntaddr;
@ XOR bit five:
movs r2,0b10000
eors r1,r2 @ dispcnt ^= 0b10000u;
@ Save dispcnt:
strh r1,[r0] @ *(ax_i10 *)dispcntaddr = dispcnt;
@ Get the address of the video bank:
b __ax_getvbnk @ ax_i20 vaddr = __ax_getvbnk();
bx lr @ return vaddr;
.endfunc
.align
.dispcntaddr:
.long 0x4000000
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