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Timing fix

This commit is contained in:
Lior Halphon 2021-01-16 14:43:32 +02:00
parent 0056cc2d61
commit 13a1e9d332
1 changed files with 9 additions and 3 deletions
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12
Core/apu.c
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@ -1188,9 +1188,15 @@ void GB_apu_write(GB_gameboy_t *gb, uint8_t reg, uint8_t value)
if (gb->apu.channel_4_countdown_reloaded) {
unsigned divisor = (gb->io_registers[GB_IO_NR43] & 0x07) << 2;
if (!divisor) divisor = 2;
gb->apu.noise_channel.counter_countdown =
divisor + (divisor == 2? 0 : (uint8_t[]){2, 1, 0, 3}[(gb->apu.noise_channel.alignment) & 3]);
gb->apu.channel_4_delta = 0;
if (gb->model > GB_MODEL_CGB_C) {
gb->apu.noise_channel.counter_countdown =
divisor + (divisor == 2? 0 : (uint8_t[]){2, 1, 0, 3}[(gb->apu.noise_channel.alignment) & 3]);
}
else {
gb->apu.noise_channel.counter_countdown =
divisor + (divisor == 2? 0 : (uint8_t[]){2, 1, 4, 3}[(gb->apu.noise_channel.alignment) & 3]);
}
gb->apu.channel_4_delta = 0;
}
/* Step LFSR */
if (new_bit && (!old_bit || gb->model <= GB_MODEL_CGB_C)) {