227 lines
6.9 KiB
Rust
227 lines
6.9 KiB
Rust
#![no_main]
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#![no_std]
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use defmt_rtt as _; // global logger
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use panic_probe as _;
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use stm32f1xx_hal as _;
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// same panicking *behavior* as `panic-probe` but doesn't print a panic message
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// this prevents the panic message being printed *twice* when `defmt::panic` is invoked
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#[defmt::panic_handler]
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fn panic() -> ! {
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cortex_m::asm::udf()
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}
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use rtic::app;
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mod filters;
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mod si5153;
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#[app(device = stm32f1xx_hal::pac, peripherals = true, dispatchers = [SPI3])]
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mod app {
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use num::Complex;
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use stm32f1xx_hal::{
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adc,
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gpio::{
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self, gpioa, gpiob, gpioc, Alternate, Analog, Floating, Input, OpenDrain, Output,
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PushPull, CRH, CRL,
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},
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i2c,
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i2c::BlockingI2c,
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pac::{ADC1, I2C1, TIM2, TIM4},
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prelude::*,
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serial::{self, Config, Serial},
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stm32,
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timer::{self, Channel, CounterHz, Event, Tim3NoRemap, Tim4NoRemap},
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};
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use systick_monotonic::Systick;
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use arrayvec::ArrayString;
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use num_traits::float::Float;
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use crate::filters;
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use crate::si5153;
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type AppI2C1 = BlockingI2c<
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I2C1,
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(
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gpiob::PB6<Alternate<OpenDrain>>,
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gpiob::PB7<Alternate<OpenDrain>>,
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),
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>;
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type AudioPwm = timer::PwmHz<
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TIM4,
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Tim4NoRemap,
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timer::Ch<2>,
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gpio::Pin<Alternate<gpio::PushPull>, CRH, 'B', 8>,
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>;
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#[monotonic(binds = SysTick, default = true)]
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type MonoTimer = Systick<1_000>;
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#[shared]
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struct Shared {}
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#[local]
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struct Local {
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pll: si5153::Si5153<AppI2C1>,
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i2c: AppI2C1,
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board_led: gpioc::PC13<Output<PushPull>>,
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rx_en: gpioa::PA7<Output<PushPull>>,
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adc1: adc::Adc<ADC1>,
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mic_in: gpio::Pin<Analog, CRL, 'A', 4>,
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i_in: gpio::Pin<Analog, CRL, 'A', 1>,
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q_in: gpio::Pin<Analog, CRL, 'A', 0>,
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phase: f32,
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i_offset: f32,
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q_offset: f32,
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audio_pwm: AudioPwm,
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timer: CounterHz<TIM2>,
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usb_filter: filters::FirFilter<63>,
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}
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#[init]
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fn init(cx: init::Context) -> (Shared, Local, init::Monotonics) {
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let mut flash = cx.device.FLASH.constrain();
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let rcc = cx.device.RCC.constrain();
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// Freeze the configuration of all the clocks in the system and store the frozen frequencies in
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// `clocks`
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let clocks = rcc
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.cfgr
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.use_hse(8.MHz())
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.sysclk(72.MHz())
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.pclk1(36.MHz())
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.freeze(&mut flash.acr);
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defmt::info!("Clock Setup done");
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let mono = Systick::new(cx.core.SYST, clocks.sysclk().to_Hz());
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let mut afio = cx.device.AFIO.constrain();
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// Acquire the GPIOC peripheral
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let mut gpioa = cx.device.GPIOA.split();
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let mut gpiob = cx.device.GPIOB.split();
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let mut gpioc = cx.device.GPIOC.split();
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let board_led = gpioc.pc13.into_push_pull_output(&mut gpioc.crh);
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let scl = gpiob.pb6.into_alternate_open_drain(&mut gpiob.crl);
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let sda = gpiob.pb7.into_alternate_open_drain(&mut gpiob.crl);
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let mut i2c = i2c::BlockingI2c::i2c1(
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cx.device.I2C1,
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(scl, sda),
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&mut afio.mapr,
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i2c::Mode::Standard {
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frequency: 400.kHz(),
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},
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clocks,
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5,
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1,
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5,
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5,
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);
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let mut pll = si5153::Si5153::new(&i2c);
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pll.init(&mut i2c, 25000000, 800000000, 800000000);
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pll.set_ms_source(&mut i2c, si5153::Multisynth::MS0, si5153::PLL::A);
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pll.set_ms_source(&mut i2c, si5153::Multisynth::MS1, si5153::PLL::A);
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pll.set_ms_source(&mut i2c, si5153::Multisynth::MS2, si5153::PLL::B);
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pll.set_ms_freq(&mut i2c, si5153::Multisynth::MS0, 8_000_000);
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pll.set_ms_phase(&mut i2c, si5153::Multisynth::MS0, 0);
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pll.enable_ms_output(&mut i2c, si5153::Multisynth::MS0);
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pll.set_ms_freq(&mut i2c, si5153::Multisynth::MS1, 8_000_000);
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pll.set_ms_phase(&mut i2c, si5153::Multisynth::MS1, 100);
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pll.enable_ms_output(&mut i2c, si5153::Multisynth::MS1);
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let adc1 = adc::Adc::adc1(cx.device.ADC1, clocks);
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let mic_in = gpioa.pa4.into_analog(&mut gpioa.crl);
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let i_in = gpioa.pa1.into_analog(&mut gpioa.crl);
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let q_in = gpioa.pa0.into_analog(&mut gpioa.crl);
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let audio_out = gpiob.pb8.into_alternate_push_pull(&mut gpiob.crh);
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let mut audio_pwm = cx.device.TIM4.pwm_hz::<Tim4NoRemap, _, _>(
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audio_out,
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&mut afio.mapr,
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192.kHz(),
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&clocks,
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);
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audio_pwm.enable(Channel::C3);
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audio_pwm.set_duty(Channel::C3, 0u16);
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let mut rx_en = gpioa.pa7.into_push_pull_output(&mut gpioa.crl);
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rx_en.set_high();
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let mut bias_pin = gpioa.pa6.into_alternate_push_pull(&mut gpioa.crl);
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let mut bias_pwm =
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cx.device
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.TIM3
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.pwm_hz::<Tim3NoRemap, _, _>(bias_pin, &mut afio.mapr, 64.kHz(), &clocks);
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let mut timer = timer::Timer2::new(cx.device.TIM2, &clocks).counter_hz();
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timer.start(6400.Hz()).unwrap();
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// Generate an interrupt when the timer expires
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timer.listen(Event::Update);
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(
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Shared {},
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Local {
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i2c,
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pll,
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board_led,
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rx_en,
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adc1,
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mic_in,
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i_in,
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q_in,
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phase: 0.0,
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i_offset: 2048.0,
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q_offset: 2048.0,
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audio_pwm,
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timer,
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usb_filter: filters::usb_firfilter(),
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},
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init::Monotonics(mono),
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)
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}
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#[task(binds=TIM2, local=[timer, pll, i2c, adc1, mic_in, i_in, q_in, audio_pwm, phase, i_offset, q_offset, board_led, usb_filter])]
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fn transmit(mut ctx: transmit::Context) {
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ctx.local.board_led.toggle();
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let mut adc = ctx.local.adc1;
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let mut i_in = ctx.local.i_in;
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let mut q_in = ctx.local.q_in;
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let i_raw: u16 = adc.read(&mut *q_in).unwrap();
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let q_raw: u16 = adc.read(&mut *i_in).unwrap();
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*ctx.local.i_offset = 0.95 * *ctx.local.i_offset + 0.05 * (i_raw as f32);
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*ctx.local.q_offset = 0.95 * *ctx.local.q_offset + 0.05 * (q_raw as f32);
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let i_sample = (i_raw as f32) - *ctx.local.i_offset;
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let q_sample = (q_raw as f32) - *ctx.local.q_offset;
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let sample = Complex::new(i_sample as f32 / 4096.0, q_sample as f32 / 4096.0);
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let filtered = ctx.local.usb_filter.compute(sample) * 2.0;
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let max_duty = if ctx.local.audio_pwm.get_max_duty() != 0 {
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ctx.local.audio_pwm.get_max_duty() as f32
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} else {
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2.0.powi(16)
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};
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let output = filtered.re * max_duty;
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ctx.local.audio_pwm.set_duty(Channel::C3, output as u16);
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ctx.local.timer.clear_interrupt(Event::Update);
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}
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}
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