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refactor dac into a trait, add volume support

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This commit is contained in:
Keenan Tims
2026-05-08 16:09:10 -07:00
parent 7d3e58c9ad
commit 138861fc07
4 changed files with 127 additions and 81 deletions
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src/ak4490.rs
-48
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@@ -1,48 +0,0 @@
use cortex_m::prelude::{_embedded_hal_blocking_i2c_Write, _embedded_hal_blocking_i2c_WriteRead};
use defmt::warn;
use crate::hal::prelude::*;
use crate::{CodecPins, MCLK_FREQ, SAMPLE_RATE, SampleType};
const AK4490_I2C_ADDRESS: u8 = 0x10;
#[repr(u8)]
enum RegisterAddress {
Control1 = 0x00,
Control2 = 0x01,
Control3 = 0x02,
LeftAtt = 0x03,
RightAtt = 0x04,
Control4 = 0x05,
Control5 = 0x06,
Control6 = 0x07,
Control7 = 0x08,
Control8 = 0x09,
}
#[inline]
fn write_reg<T>(i2c: &mut T, reg: RegisterAddress, val: u8)
where
T: _embedded_hal_blocking_i2c_WriteRead + _embedded_hal_blocking_i2c_Write,
{
i2c.write(AK4490_I2C_ADDRESS, &[reg as u8, val]).ok();
}
pub(crate) fn init_dac<T>(i2c: &mut T, mut pins: CodecPins)
where
T: _embedded_hal_blocking_i2c_WriteRead + _embedded_hal_blocking_i2c_Write,
{
// bring out of reset
pins.reset.set_high();
write_reg(i2c, RegisterAddress::Control1, (1 << 7) | 0x0e | (1 << 0)); // ACKS | I2S-32 | RSTN
let dfs = match SAMPLE_RATE {
r if r < 54000 => 0,
r if r < 108000 => 1,
r if r < 216000 => 2,
r if r <= 384000 => 4,
_ => 5,
};
// default = 0x22
write_reg(i2c, RegisterAddress::Control2, 0x22 | ((dfs & 0x3) << 3));
write_reg(i2c, RegisterAddress::Control4, (dfs & 0x4) >> 1);
}
src/dac/ak4490.rs
+72
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@@ -0,0 +1,72 @@
use cortex_m::prelude::{_embedded_hal_blocking_i2c_Write, _embedded_hal_blocking_i2c_WriteRead};
use crate::CodecPins;
use crate::hal::prelude::*;
use crate::traits::Dac;
const AK4490_I2C_ADDRESS: u8 = 0x10;
#[repr(u8)]
#[allow(dead_code)]
enum RegisterAddress {
Control1 = 0x00,
Control2 = 0x01,
Control3 = 0x02,
LeftAtt = 0x03,
RightAtt = 0x04,
Control4 = 0x05,
Control5 = 0x06,
Control6 = 0x07,
Control7 = 0x08,
Control8 = 0x09,
}
pub struct Ak4490Dac<T> {
i2c: T,
pins: CodecPins, // this dependency is unfortunate, but non trivial to generalize
}
impl<T> Ak4490Dac<T>
where
T: _embedded_hal_blocking_i2c_WriteRead + _embedded_hal_blocking_i2c_Write,
{
#[inline]
fn write_reg(&mut self, reg: RegisterAddress, val: u8) {
self.i2c.write(AK4490_I2C_ADDRESS, &[reg as u8, val]).ok();
}
fn dfs_for_rate(&self, rate: u32) -> u8 {
match rate {
r if r < 54000 => 0,
r if r < 108000 => 1,
r if r < 216000 => 2,
r if r <= 384000 => 4,
_ => 5,
}
}
}
impl<T> Dac<T> for Ak4490Dac<T>
where
T: _embedded_hal_blocking_i2c_WriteRead + _embedded_hal_blocking_i2c_Write,
{
fn new(i2c: T, pins: CodecPins) -> Self {
Self { i2c, pins }
}
fn init(&mut self) {
// bring out of reset
self.pins.reset.set_high();
self.write_reg(RegisterAddress::Control1, (1 << 7) | 0x0e | (1 << 0)); // ACKS | I2S-32 | RSTN
let dfs = 0; // start in 48k mode, change_rate will be called after init
self.write_reg(RegisterAddress::Control2, 0x22 | ((dfs & 0x3) << 3));
self.write_reg(RegisterAddress::Control4, (dfs & 0x4) >> 1);
}
fn change_rate(&mut self, new_rate: u32) {
let dfs = self.dfs_for_rate(new_rate);
self.write_reg(RegisterAddress::Control2, 0x22 | ((dfs & 0x3) << 3));
self.write_reg(RegisterAddress::Control4, (dfs & 0x4) >> 1);
}
fn set_volume(&mut self, left: u8, right: u8) {
self.write_reg(RegisterAddress::LeftAtt, left);
self.write_reg(RegisterAddress::RightAtt, right);
}
}
src/main.rs
+47 -33
View File
@@ -36,11 +36,16 @@ use usbd_uac2::{
descriptors::{ChannelConfig, ClockType, FormatType1, LockDelay},
};
use crate::dac::DacImpl;
use crate::traits::Dac;
#[cfg(feature = "ak4490")]
mod ak4490;
#[cfg(feature = "ak4490")]
use ak4490 as dac;
mod hw;
pub mod dac {
mod ak4490;
pub use self::ak4490::Ak4490Dac as DacImpl;
}
mod traits;
// Fo = M/(N*2*P) * Fin
// Fo = 3072/(125*2*8) * 16MHz = 24.576MHz
@@ -227,14 +232,20 @@ fn FLEXCOMM7() {
}
}
struct Audio<T: BbqHandle> {
struct Audio<T: BbqHandle, D: Dac<I>, I> {
running: AtomicBool,
i2s: I2sTx,
dac: D,
producer: StreamProducer<T>,
integrator: AtomicI32,
filtered_fill: AtomicI32,
_marker: core::marker::PhantomData<I>,
}
impl<T: BbqHandle> Audio<T> {
impl<T: BbqHandle, D: Dac<I>, I> Audio<T, D, I> {
fn init(&mut self) {
self.dac.init();
self.dac.change_rate(SAMPLE_RATE);
}
fn start(&self) {
self.running.store(true, Ordering::Relaxed);
defmt::info!("playback starting, enabling interrupts");
@@ -255,7 +266,7 @@ impl<T: BbqHandle> Audio<T> {
pac::NVIC::mask(pac::Interrupt::FLEXCOMM7);
}
}
impl<T: BbqHandle, B: bus::UsbBus> UsbAudioClass<'_, B> for Audio<T> {
impl<T: BbqHandle, D: Dac<I>, I, B: bus::UsbBus> UsbAudioClass<'_, B> for Audio<T, D, I> {
fn alternate_setting_changed(&mut self, _terminal: usb_device::UsbDirection, alt_setting: u8) {
match alt_setting {
0 => self.stop(),
@@ -477,7 +488,7 @@ fn main() -> ! {
.system_frequency(96.MHz())
.configure(&mut anactrl, &mut pmc, &mut syscon)
.unwrap();
let mut _delay_timer = Timer::new(
let mut delay_timer = Timer::new(
hal.ctimer
.0
.enabled(&mut syscon, clocks.support_1mhz_fro_token().unwrap()),
@@ -490,11 +501,12 @@ fn main() -> ! {
.4
.enabled_as_i2c(&mut syscon, &clocks.support_flexcomm_token().unwrap());
let mut i2c_bus = I2cMaster::new(
let i2c_bus = I2cMaster::new(
i2c_peripheral,
codec_i2c_pins,
Hertz::try_from(400.kHz()).unwrap(),
);
let dac_impl = DacImpl::new(i2c_bus, codec_gpio_pins);
let i2s_peripheral = {
let fc7 = hal.flexcomm.7.release();
@@ -505,26 +517,41 @@ fn main() -> ! {
&mut anactrl,
&mut pmc,
&mut syscon,
&mut _delay_timer,
&mut delay_timer,
clocks.support_usbhs_token().unwrap(),
);
defmt::info!("audio init");
let mut audio = Audio {
i2s: i2s_peripheral,
dac: dac_impl,
producer: QUEUE.stream_producer(),
running: AtomicBool::new(false),
integrator: AtomicI32::new(0),
filtered_fill: AtomicI32::new(0),
_marker: core::marker::PhantomData,
};
audio.init();
let usb_bus = UsbBus::new(usb_peripheral, usb0_vbus_pin);
let mut clock = Clock {
pins: clock_sel_pins,
cur_rate: SAMPLE_RATE,
};
defmt::debug!("codec init");
dac::init_dac(&mut i2c_bus, codec_gpio_pins);
let mut audio = Audio {
i2s: i2s_peripheral,
producer: QUEUE.stream_producer(),
running: AtomicBool::new(false),
integrator: AtomicI32::new(0),
filtered_fill: AtomicI32::new(0),
};
let mut usb_dev = UsbDeviceBuilder::new(&usb_bus, UsbVidPid(0x1209, 0xcc1d))
.composite_with_iads()
.strings(&[StringDescriptors::default()
.manufacturer("VE7XEN")
.product("Guac Tortilla")
.serial_number("123456789")])
.unwrap()
.max_packet_size_0(64)
.unwrap()
.device_class(0xef)
.device_sub_class(0x02)
.device_protocol(0x01)
.build();
let config = AudioClassConfig::new(UsbSpeed::High, FunctionCode::Other, &mut clock, &mut audio)
.with_output_config(TerminalConfig::new(
@@ -544,19 +571,6 @@ fn main() -> ! {
let mut uac2 = config.build(&usb_bus).unwrap();
let mut usb_dev = UsbDeviceBuilder::new(&usb_bus, UsbVidPid(0x1209, 0xcc1d))
.composite_with_iads()
.strings(&[StringDescriptors::default()
.manufacturer("VE7XEN")
.product("Guac Tortilla")
.serial_number("123456789")])
.unwrap()
.max_packet_size_0(64)
.unwrap()
.device_class(0xef)
.device_sub_class(0x02)
.device_protocol(0x01)
.build();
defmt::info!("main loop");
src/traits.rs
+8
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@@ -0,0 +1,8 @@
use crate::CodecPins;
pub trait Dac<T> {
fn new(i2c: T, pins: CodecPins) -> Self;
fn init(&mut self);
fn change_rate(&mut self, new_rate: u32);
#[allow(unused_variables)]
fn set_volume(&mut self, left: u8, right: u8) {}
}