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rpll: simplify parameters, add one test

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This commit is contained in:
Robert Jördens 2021-02-04 12:46:33 +01:00
parent 5951a0d41d
commit f250e036ca
1 changed files with 21 additions and 9 deletions
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30
dsp/src/rpll.rs
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@ -94,7 +94,6 @@ mod test {
struct Harness {
rpll: RPLL,
dt2: u8,
shift_frequency: u8,
shift_phase: u8,
noise: i32,
@ -109,7 +108,6 @@ mod test {
fn default() -> Self {
Self {
rpll: RPLL::new(8),
dt2: 8,
shift_frequency: 9,
shift_phase: 8,
noise: 0,
@ -122,7 +120,7 @@ mod test {
}
fn run(&mut self, n: usize) -> (Vec<f32>, Vec<f32>) {
assert!(self.period >= 1 << self.dt2);
assert!(self.period >= 1 << self.rpll.dt2);
assert!(self.period < 1 << self.shift_frequency);
assert!(self.period < 1 << self.shift_phase + 1);
@ -130,7 +128,7 @@ mod test {
let mut f = Vec::<f32>::new();
for _ in 0..n {
let timestamp = if self.time - self.next_noisy >= 0 {
assert!(self.time - self.next_noisy < 1 << self.dt2);
assert!(self.time - self.next_noisy < 1 << self.rpll.dt2);
self.next = self.next.wrapping_add(self.period);
let timestamp = self.next_noisy;
let p_noise = self.rng.gen_range(-self.noise..=self.noise);
@ -151,23 +149,23 @@ mod test {
// phase error
y.push(yi.wrapping_sub(y_ref) as f32 / 2f32.powi(32));
let p_ref = 1 << 32 + self.dt2;
let p_ref = 1 << 32 + self.rpll.dt2;
let p_sig = fi as u64 * self.period as u64;
// relative frequency error
f.push(
p_sig.wrapping_sub(p_ref) as i64 as f32
/ 2f32.powi(32 + self.dt2 as i32),
/ 2f32.powi(32 + self.rpll.dt2 as i32),
);
// advance time
self.time = self.time.wrapping_add(1 << self.dt2);
self.time = self.time.wrapping_add(1 << self.rpll.dt2);
}
(y, f)
}
fn measure(&mut self, n: usize, limits: [f32; 4]) {
let t_settle = (1 << self.shift_frequency - self.dt2 + 4)
+ (1 << self.shift_phase - self.dt2 + 4);
let t_settle = (1 << self.shift_frequency - self.rpll.dt2 + 4)
+ (1 << self.shift_phase - self.rpll.dt2 + 4);
self.run(t_settle);
let (y, f) = self.run(n);
@ -268,4 +266,18 @@ mod test {
h.measure(1 << 16, [2e-4, 6e-3, 2e-4, 2e-3]);
}
#[test]
fn batch_fast_narrow() {
let mut h = Harness::default();
h.rpll.dt2 = 8 + 3;
h.period = 2431;
h.next = 35281;
h.next_noisy = h.next;
h.noise = 100;
h.shift_frequency = 23;
h.shift_phase = 23;
h.measure(1 << 16, [1e-8, 2e-5, 6e-4, 6e-4]);
}
}