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Correct preservation of NRx1's state on pre-CGB models

This commit is contained in:
Lior Halphon 2020-12-01 14:18:19 +02:00
parent 74cf452a48
commit 13bc8679f9
1 changed files with 9 additions and 12 deletions
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21
Core/apu.c
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@ -633,11 +633,11 @@ void GB_apu_write(GB_gameboy_t *gb, uint8_t reg, uint8_t value)
break;
case GB_IO_NR52: {
uint8_t old_nrx1[] = {
gb->io_registers[GB_IO_NR11],
gb->io_registers[GB_IO_NR21],
gb->io_registers[GB_IO_NR31],
gb->io_registers[GB_IO_NR41]
uint8_t old_pulse_lengths[] = {
gb->apu.square_channels[0].pulse_length,
gb->apu.square_channels[1].pulse_length,
gb->apu.wave_channel.pulse_length,
gb->apu.noise_channel.pulse_length
};
if ((value & 0x80) && !gb->apu.global_enable) {
GB_apu_init(gb);
@ -649,17 +649,14 @@ void GB_apu_write(GB_gameboy_t *gb, uint8_t reg, uint8_t value)
}
memset(&gb->apu, 0, sizeof(gb->apu));
memset(gb->io_registers + GB_IO_NR10, 0, GB_IO_WAV_START - GB_IO_NR10);
old_nrx1[0] &= 0x3F;
old_nrx1[1] &= 0x3F;
gb->apu.global_enable = false;
}
if (!GB_is_cgb(gb) && (value & 0x80)) {
GB_apu_write(gb, GB_IO_NR11, old_nrx1[0]);
GB_apu_write(gb, GB_IO_NR21, old_nrx1[1]);
GB_apu_write(gb, GB_IO_NR31, old_nrx1[2]);
GB_apu_write(gb, GB_IO_NR41, old_nrx1[3]);
gb->apu.square_channels[0].pulse_length = old_pulse_lengths[0];
gb->apu.square_channels[1].pulse_length = old_pulse_lengths[1];
gb->apu.wave_channel.pulse_length = old_pulse_lengths[2];
gb->apu.noise_channel.pulse_length = old_pulse_lengths[3];
}
}
break;