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audio works! almost...

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This commit is contained in:
Alex Janka 2023-02-19 19:10:53 +11:00
parent 0f5bcb8e46
commit f2e08c2c1c
1 changed files with 8 additions and 5 deletions
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13
src/processor/memory/mmio/apu/channels.rs
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@ -128,7 +128,7 @@ pub(super) struct PwmChannel {
impl PwmChannel {
pub(super) fn new(enabled: bool) -> Self {
let wavelength = 0x700;
let wavelength = 0x7FF;
Self {
enabled,
sweep: Sweep::default(),
@ -138,7 +138,7 @@ impl PwmChannel {
envelope: Envelope::default(),
queued_envelope: Envelope::default(),
wavelength,
wave_timer: set_wave_timer(wavelength),
wave_timer: (2048 - wavelength) * 4,
wave_position: 0,
}
}
@ -156,6 +156,7 @@ impl PwmChannel {
(self.wave_timer, b) = self.wave_timer.overflowing_sub(1);
if b {
self.wave_position = (self.wave_position + 1) % 8;
self.set_wave_timer();
}
self.dac(self.duty_cycle.as_waveform()[self.wave_position])
})
@ -250,11 +251,13 @@ impl PwmChannel {
pub(super) fn update_wavelength_low(&mut self, data: u8) {
self.wavelength = (self.wavelength & 0xFF00) | (data as u16);
self.set_wave_timer();
}
pub(super) fn update_wavelength_high_and_control(&mut self, data: u8) {
self.length_enable = get_bit(data, 6);
self.wavelength = (self.wavelength & 0xFF) | (((data & 0b111) as u16) << 8);
self.set_wave_timer();
if get_bit(data, 7) {
self.trigger();
}
@ -263,10 +266,10 @@ impl PwmChannel {
pub(super) fn get_control(&self) -> u8 {
set_or_clear_bit(0, 6, self.length_enable)
}
}
fn set_wave_timer(wavelength: u16) -> u16 {
(2048 - wavelength) * 4
fn set_wave_timer(&mut self) {
self.wave_timer = (2048 - self.wavelength) * 4;
}
}
pub(super) struct WaveChannel {