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More accurate interrupt emulation

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This commit is contained in:
Lior Halphon 2020-11-14 13:55:39 +02:00
parent 60b8978762
commit c36bdc22f6
1 changed files with 16 additions and 2 deletions
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18
Core/sm83_cpu.c
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@ -261,7 +261,20 @@ static void cycle_oam_bug(GB_gameboy_t *gb, uint8_t register_id)
} }
GB_trigger_oam_bug(gb, gb->registers[register_id]); /* Todo: test T-cycle timing */ GB_trigger_oam_bug(gb, gb->registers[register_id]); /* Todo: test T-cycle timing */
gb->pending_cycles = 4; gb->pending_cycles = 4;
}
static void cycle_oam_bug_pc(GB_gameboy_t *gb)
{
if (GB_is_cgb(gb)) {
/* Slight optimization */
gb->pending_cycles += 4;
return;
}
if (gb->pending_cycles) {
GB_advance_cycles(gb, gb->pending_cycles);
}
GB_trigger_oam_bug(gb, gb->pc); /* Todo: test T-cycle timing */
gb->pending_cycles = 4;
} }
static void flush_pending_cycles(GB_gameboy_t *gb) static void flush_pending_cycles(GB_gameboy_t *gb)
@ -1538,8 +1551,9 @@ void GB_cpu_run(GB_gameboy_t *gb)
gb->halted = false; gb->halted = false;
uint16_t call_addr = gb->pc; uint16_t call_addr = gb->pc;
cycle_no_access(gb); gb->last_opcode_read = cycle_read_inc_oam_bug(gb, gb->pc++);
cycle_no_access(gb); cycle_oam_bug_pc(gb);
gb->pc--;
GB_trigger_oam_bug(gb, gb->registers[GB_REGISTER_SP]); /* Todo: test T-cycle timing */ GB_trigger_oam_bug(gb, gb->registers[GB_REGISTER_SP]); /* Todo: test T-cycle timing */
cycle_no_access(gb); cycle_no_access(gb);