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fix(apu): implement write guards for Ch1 & Ch1 when disabled

This commit is contained in:
Rekai Nyangadzayi Musuka 2021-07-18 22:10:32 -05:00
parent f429d72882
commit 6f6c308d84
2 changed files with 93 additions and 45 deletions
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126
src/apu.rs
View File

@ -275,11 +275,11 @@ impl SoundControl {
#[derive(Debug, Clone, Copy, Default)]
pub(crate) struct Channel1 {
/// 0xFF10 | NR10 - Channel 1 Sweep Register
pub(crate) sweep: Sweep,
sweep: Sweep,
/// 0xFF11 | NR11 - Channel 1 Sound length / Wave pattern duty
duty: SoundDuty,
/// 0xFF12 | NR12 - Channel 1 Volume Envelope
pub(crate) envelope: VolumeEnvelope,
envelope: VolumeEnvelope,
/// 0xFF13 | NR13 - Channel 1 Frequency low (lower 8 bits only)
freq_lo: u8,
/// 0xFF14 | NR14 - Channel 1 Frequency high
@ -322,6 +322,18 @@ impl Channel1 {
}
}
/// 0xFF10 | NR10 - Channel 1 Sweep Register
pub(crate) fn sweep(&self) -> u8 {
self.sweep.into()
}
/// 0xFF10 | NR10 - Channel 1 Sweep Register
pub(crate) fn set_sweep(&mut self, byte: u8) {
if self.enabled {
self.sweep = byte.into()
}
}
/// 0xFF11 | NR11 - Channel 1 Sound length / Wave pattern duty
pub(crate) fn duty(&self) -> u8 {
u8::from(self.duty) & 0xC0 // Only bits 7 and 6 can be read
@ -329,13 +341,29 @@ impl Channel1 {
/// 0xFF11 | NR11 - Channel 1 Sound length / Wave pattern duty
pub(crate) fn set_duty(&mut self, byte: u8) {
self.duty = byte.into();
self.length_timer = 64 - self.duty.sound_length() as u16;
if self.enabled {
self.duty = byte.into();
self.length_timer = 64 - self.duty.sound_length() as u16;
}
}
/// 0xFF12 | NR12 - Channel 1 Volume Envelope
pub fn envelope(&self) -> u8 {
self.envelope.into()
}
/// 0xFF12 | NR12 - Channel 1 Volume Envelope
pub(crate) fn set_envelope(&mut self, byte: u8) {
if self.enabled {
self.envelope = byte.into()
}
}
/// 0xFF13 | NR13 - Channel 1 Frequency low (lower 8 bits only)
pub(crate) fn set_freq_lo(&mut self, byte: u8) {
self.freq_lo = byte;
if self.enabled {
self.freq_lo = byte;
}
}
/// 0xFF14 | NR14 - Channel 1 Frequency high
@ -345,33 +373,35 @@ impl Channel1 {
/// 0xFF14 | NR14 - Channel 1 Frequency high
pub(crate) fn set_freq_hi(&mut self, byte: u8) {
self.freq_hi = byte.into();
if self.enabled {
self.freq_hi = byte.into();
// If this bit is set, a trigger event occurs
if self.freq_hi.initial() {
// Envelope Behaviour during trigger event
self.period_timer = self.envelope.period();
self.current_volume = self.envelope.init_vol();
// If this bit is set, a trigger event occurs
if self.freq_hi.initial() {
// Envelope Behaviour during trigger event
self.period_timer = self.envelope.period();
self.current_volume = self.envelope.init_vol();
// Sweep behaviour during trigger event
self.shadow_freq = self.frequency() & 0x07FF; // Mask should be redundant
self.sweep_timer = if self.sweep.period() != 0 {
self.sweep.period()
} else {
8
};
// Sweep behaviour during trigger event
self.shadow_freq = self.frequency() & 0x07FF; // Mask should be redundant
self.sweep_timer = if self.sweep.period() != 0 {
self.sweep.period()
} else {
8
};
if self.sweep.period() != 0 || self.sweep.shift_count() != 0 {
self.sweep_enabled = true;
}
if self.sweep.period() != 0 || self.sweep.shift_count() != 0 {
self.sweep_enabled = true;
}
if self.sweep.shift_count() != 0 {
let _ = self.calc_sweep_freq();
}
if self.sweep.shift_count() != 0 {
let _ = self.calc_sweep_freq();
}
// Length behaviour during trigger event
if self.length_timer == 0 {
self.length_timer = 64;
// Length behaviour during trigger event
if self.length_timer == 0 {
self.length_timer = 64;
}
}
}
}
@ -410,7 +440,7 @@ pub(crate) struct Channel2 {
/// 0xFF16 | NR21 - Channel 2 Sound length / Wave Pattern Duty
duty: SoundDuty,
/// 0xFF17 | NR22 - Channel 2 Volume ENvelope
pub(crate) envelope: VolumeEnvelope,
envelope: VolumeEnvelope,
/// 0xFF18 | NR23 - Channel 2 Frequency low (lower 8 bits only)
freq_lo: u8,
/// 0xFF19 | NR24 - Channel 2 Frequency high
@ -455,13 +485,29 @@ impl Channel2 {
/// 0xFF16 | NR21 - Channel 2 Sound length / Wave Pattern Duty
pub(crate) fn set_duty(&mut self, byte: u8) {
self.duty = byte.into();
self.length_timer = 64 - self.duty.sound_length() as u16;
if self.enabled {
self.duty = byte.into();
self.length_timer = 64 - self.duty.sound_length() as u16;
}
}
/// 0xFF17 | NR22 - Channel 2 Volume ENvelope
pub(crate) fn envelope(&self) -> u8 {
self.envelope.into()
}
/// 0xFF17 | NR22 - Channel 2 Volume ENvelope
pub(crate) fn set_envelope(&mut self, byte: u8) {
if self.enabled {
self.envelope = byte.into()
}
}
/// 0xFF18 | NR23 - Channel 2 Frequency low (lower 8 bits only)
pub(crate) fn set_freq_lo(&mut self, byte: u8) {
self.freq_lo = byte;
if self.enabled {
self.freq_lo = byte;
}
}
/// 0xFF19 | NR24 - Channel 2 Frequency high
@ -471,16 +517,18 @@ impl Channel2 {
/// 0xFF19 | NR24 - Channel 2 Frequency high
pub(crate) fn set_freq_hi(&mut self, byte: u8) {
self.freq_hi = byte.into();
if self.enabled {
self.freq_hi = byte.into();
if self.freq_hi.initial() {
// Envelope behaviour during trigger event
self.period_timer = self.envelope.period();
self.current_volume = self.envelope.init_vol();
if self.freq_hi.initial() {
// Envelope behaviour during trigger event
self.period_timer = self.envelope.period();
self.current_volume = self.envelope.init_vol();
// Length behaviour during trigger event
if self.length_timer == 0 {
self.length_timer = 64;
// Length behaviour during trigger event
if self.length_timer == 0 {
self.length_timer = 64;
}
}
}
}

12
src/bus.rs
View File

@ -224,12 +224,12 @@ impl BusIo for Bus {
0x06 => self.timer.modulo,
0x07 => self.timer.ctrl.into(),
0x0F => self.interrupt_flag().into(),
0x10 => self.apu.ch1.sweep.into(),
0x10 => self.apu.ch1.sweep(),
0x11 => self.apu.ch1.duty(),
0x12 => self.apu.ch1.envelope.into(),
0x12 => self.apu.ch1.envelope(),
0x14 => self.apu.ch1.freq_hi(),
0x16 => self.apu.ch2.duty(),
0x17 => self.apu.ch2.envelope.into(),
0x17 => self.apu.ch2.envelope(),
0x19 => self.apu.ch2.freq_hi(),
0x1A => self.apu.ch3.enabled(),
0x1B => self.apu.ch3.len(),
@ -342,13 +342,13 @@ impl BusIo for Bus {
0x06 => self.timer.modulo = byte,
0x07 => self.timer.ctrl = byte.into(),
0x0F => self.set_interrupt_flag(byte),
0x10 => self.apu.ch1.sweep = byte.into(),
0x10 => self.apu.ch1.set_sweep(byte),
0x11 => self.apu.ch1.set_duty(byte),
0x12 => self.apu.ch1.envelope = byte.into(),
0x12 => self.apu.ch1.set_envelope(byte),
0x13 => self.apu.ch1.set_freq_lo(byte),
0x14 => self.apu.ch1.set_freq_hi(byte),
0x16 => self.apu.ch2.set_duty(byte),
0x17 => self.apu.ch2.envelope = byte.into(),
0x17 => self.apu.ch2.set_envelope(byte),
0x18 => self.apu.ch2.set_freq_lo(byte),
0x19 => self.apu.ch2.set_freq_hi(byte),
0x1A => self.apu.ch3.set_enabled(byte),