75 lines
2.0 KiB
Rust
75 lines
2.0 KiB
Rust
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use std::io::{BufReader, Read};
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use num_traits::clamp;
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pub struct Dpll {
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ftw_min: i64,
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ftw_max: i64,
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ki: i64,
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kp: i64,
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ftw: i64,
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integrator: i64,
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phase: i64,
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phase_unwrapped: i64,
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}
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impl Dpll {
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pub fn new(ftw_min: i64, ftw_max: i64, ki: i64, kp: i64) -> Dpll {
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assert!(ftw_min < 0x80000000);
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assert!(ftw_max < 0x80000000);
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let init_ftw = (ftw_min + ftw_max)/2;
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Dpll {
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ftw_min: ftw_min,
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ftw_max: ftw_max,
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ki: ki,
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kp: kp,
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ftw: init_ftw,
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integrator: init_ftw,
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phase: 0,
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phase_unwrapped: 0
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}
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}
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pub fn frequency_to_ftw(frequency: f64, sample_rate: f64) -> i64 {
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(frequency*(u32::max_value() as f64)/sample_rate) as i64
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}
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pub fn tick(&mut self, edge: bool) {
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self.phase = (self.phase + self.ftw) & 0xffffffff;
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self.phase_unwrapped = self.phase_unwrapped.wrapping_add(self.ftw);
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if edge {
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let pe = 0x80000000 - self.phase;
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self.integrator = clamp(self.integrator + (pe*self.ki >> 32),
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self.ftw_min, self.ftw_max);
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self.ftw = clamp(self.integrator + (pe*self.kp >> 32),
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self.ftw_min, self.ftw_max);
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}
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}
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pub fn get_phase_unwrapped(&self) -> i64 {
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self.phase_unwrapped
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}
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}
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pub fn sample(command: &str, mut callback: impl FnMut(u8, u8)) {
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let child = std::process::Command::new("sh")
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.arg("-c")
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.arg(command)
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.stdout(std::process::Stdio::piped())
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.spawn()
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.unwrap();
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let mut reader = BufReader::new(child.stdout.unwrap());
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let mut br_sample = [0; 1];
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let mut last_sample = 0;
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loop {
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reader.read_exact(&mut br_sample).unwrap();
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let sample = br_sample[0];
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let rising = sample & !last_sample;
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let falling = !sample & last_sample;
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callback(rising, falling);
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last_sample = sample;
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}
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}
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