diff options
Diffstat (limited to 'agbx/source/gfx/flip.s')
| -rw-r--r-- | agbx/source/gfx/flip.s | 37 |
1 files changed, 15 insertions, 22 deletions
diff --git a/agbx/source/gfx/flip.s b/agbx/source/gfx/flip.s index c2f4336..019289d 100644 --- a/agbx/source/gfx/flip.s +++ b/agbx/source/gfx/flip.s @@ -7,6 +7,8 @@ .cpu arm7tdmi .thumb +.extern __agbx_getvbnk + .globl agbx_flip .func @@ -14,19 +16,20 @@ .thumb_func agbx_flip: + @ Get the current value of dispcnt: 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 + ldrh r1,[r0] + + @ XOR bit five: + movs r2,0b10000 + eors r1,r2 + + @ Save dispcnt: + strh r1,[r0] + + @ Get the address of the video bank: + b __agbx_getvbnk + bx lr .endfunc @@ -35,13 +38,3 @@ agbx_flip: .dispcntaddr: .long 0x4000000 - -.align - -.vbnk0addr: - .long 0x6000000 - -.align - -.vbnk1addr: - .long 0x600A000 |