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Minor bugfixes related to sweeping

This commit is contained in:
Lior Halphon 2017-09-22 14:39:39 +03:00
parent 75db33559a
commit 2ffce49e16
1 changed files with 5 additions and 7 deletions
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12
Core/apu.c
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@ -523,7 +523,6 @@ void GB_apu_write(GB_gameboy_t *gb, uint8_t reg, uint8_t value)
gb->apu.square_channels[index].sample_length &= 0xFF;
gb->apu.square_channels[index].sample_length |= (value & 7) << 8;
if (index == GB_SQUARE_1) {
gb->apu.sweep_decreasing = false;
gb->apu.shadow_sweep_sample_legnth =
gb->apu.new_sweep_sample_legnth =
gb->apu.square_channels[0].sample_length;
@ -549,13 +548,12 @@ void GB_apu_write(GB_gameboy_t *gb, uint8_t reg, uint8_t value)
gb->apu.square_channels[index].length_enabled = false;
}
if (index == GB_SQUARE_1 && gb->io_registers[GB_IO_NR10] & 7) {
/* APU bug: if shift is nonzero, overflow check also occurs on trigger */
/* Todo: check actual timing */
gb->apu.square_sweep_calculate_countdown = 0x3 - gb->apu.lf_div;
}
if (index == GB_SQUARE_1) {
gb->apu.sweep_decreasing = false;
if (gb->io_registers[GB_IO_NR10] & 7) {
/* APU bug: if shift is nonzero, overflow check also occurs on trigger */
gb->apu.square_sweep_calculate_countdown = 0x13 - gb->apu.lf_div;
}
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;