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Fixing APU bugs, one at a time: Blargg’s dmg_sound 8.2

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Lior Halphon 2017-09-21 14:52:09 +03:00
parent 02ac609f3c
commit d3c15ef6ca
1 changed files with 3 additions and 2 deletions
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5
Core/apu.c
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@ -213,6 +213,7 @@ void GB_apu_div_event(GB_gameboy_t *gb)
gb->apu.square_channels[GB_SQUARE_1].sample_length &= 0x7FF; gb->apu.square_channels[GB_SQUARE_1].sample_length &= 0x7FF;
gb->apu.square_sweep_countdown = ((gb->io_registers[GB_IO_NR10] >> 4) & 7); 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;
} }
} }
} }
@ -474,8 +475,6 @@ void GB_apu_write(GB_gameboy_t *gb, uint8_t reg, uint8_t value)
/* Square channels */ /* Square channels */
case GB_IO_NR10: case GB_IO_NR10:
gb->apu.square_sweep_countdown = ((value >> 4) & 7);
if (!gb->apu.square_sweep_countdown) gb->apu.square_sweep_countdown = 8;
break; break;
case GB_IO_NR11: case GB_IO_NR11:
@ -554,6 +553,8 @@ void GB_apu_write(GB_gameboy_t *gb, uint8_t reg, uint8_t value)
if (index == GB_SQUARE_1) { if (index == GB_SQUARE_1) {
gb->apu.sweep_enabled = gb->io_registers[GB_IO_NR10] & 0x77; 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;
} }
/* Note that we don't change the sample just yet! This was verified on hardware. */ /* Note that we don't change the sample just yet! This was verified on hardware. */