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profi200/vblank_test.s

Created April 26, 2020 12:04
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VBlank time test for citra
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vblank_test.s
#include "asmfunc.h"
.arm
.cpu mpcore
.fpu vfpv2
@ u32 vblankTest(void)
ASM_FUNC vblankTest
ldr r1, =0x17E00000
mov r2, #0xFFFFFFFF
mov r12, #1
str r2, [r1, #0x600] @ REG_TIMER_LOAD
mov r0, #0
cpsid i
wfi
str r12, [r1, #0x608] @ REG_TIMER_CNT start
ldr r12, [r1, #0x10C] @ REG_CPU_II_AKN
str r12, [r1, #0x110] @ REG_CPU_II_EOI
wfi
str r0, [r1, #0x608] @ REG_TIMER_CNT stop
ldr r12, [r1, #0x10C] @ REG_CPU_II_AKN
str r12, [r1, #0x110] @ REG_CPU_II_EOI
ldr r3, [r1, #0x604] @ REG_TIMER_COUNTER
cpsie i
sub r0, r2, r3
bx lr
.pool
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