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Minor refinement to sweep

This commit is contained in:
Lior Halphon 2017-09-23 00:23:02 +03:00
parent e0a6edac35
commit 67f1566b5e
1 changed files with 3 additions and 0 deletions
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3
Core/apu.c
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@ -560,6 +560,9 @@ void GB_apu_write(GB_gameboy_t *gb, uint8_t reg, uint8_t value)
/* APU bug: if shift is nonzero, overflow check also occurs on trigger */
gb->apu.square_sweep_calculate_countdown = 0x13 - gb->apu.lf_div;
}
else {
gb->apu.square_sweep_calculate_countdown = 0;
}
gb->apu.sweep_enabled = gb->io_registers[GB_IO_NR10] & 0x77;
gb->apu.square_sweep_countdown = ((gb->io_registers[GB_IO_NR10] >> 4) & 7);
if (!gb->apu.square_sweep_countdown) gb->apu.square_sweep_countdown = 8;