Merge branch 'master' into feature/mqtt-convert

This commit is contained in:
Ryan Summers 2021-02-19 10:30:51 +01:00
commit 65a0831e2d
12 changed files with 774 additions and 303 deletions

569
Cargo.lock generated
View File

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@ -788,8 +1139,114 @@ dependencies = [
"vcell", "vcell",
] ]
[[package]]
name = "walkdir"
version = "2.3.1"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "777182bc735b6424e1a57516d35ed72cb8019d85c8c9bf536dccb3445c1a2f7d"
dependencies = [
"same-file",
"winapi",
"winapi-util",
]
[[package]] [[package]]
name = "wasi" name = "wasi"
version = "0.10.2+wasi-snapshot-preview1" version = "0.10.2+wasi-snapshot-preview1"
source = "registry+https://github.com/rust-lang/crates.io-index" source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "fd6fbd9a79829dd1ad0cc20627bf1ed606756a7f77edff7b66b7064f9cb327c6" checksum = "fd6fbd9a79829dd1ad0cc20627bf1ed606756a7f77edff7b66b7064f9cb327c6"
[[package]]
name = "wasm-bindgen"
version = "0.2.70"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "55c0f7123de74f0dab9b7d00fd614e7b19349cd1e2f5252bbe9b1754b59433be"
dependencies = [
"cfg-if",
"wasm-bindgen-macro",
]
[[package]]
name = "wasm-bindgen-backend"
version = "0.2.70"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "7bc45447f0d4573f3d65720f636bbcc3dd6ce920ed704670118650bcd47764c7"
dependencies = [
"bumpalo",
"lazy_static",
"log",
"proc-macro2",
"quote",
"syn",
"wasm-bindgen-shared",
]
[[package]]
name = "wasm-bindgen-macro"
version = "0.2.70"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "3b8853882eef39593ad4174dd26fc9865a64e84026d223f63bb2c42affcbba2c"
dependencies = [
"quote",
"wasm-bindgen-macro-support",
]
[[package]]
name = "wasm-bindgen-macro-support"
version = "0.2.70"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "4133b5e7f2a531fa413b3a1695e925038a05a71cf67e87dafa295cb645a01385"
dependencies = [
"proc-macro2",
"quote",
"syn",
"wasm-bindgen-backend",
"wasm-bindgen-shared",
]
[[package]]
name = "wasm-bindgen-shared"
version = "0.2.70"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "dd4945e4943ae02d15c13962b38a5b1e81eadd4b71214eee75af64a4d6a4fd64"
[[package]]
name = "web-sys"
version = "0.3.47"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "c40dc691fc48003eba817c38da7113c15698142da971298003cac3ef175680b3"
dependencies = [
"js-sys",
"wasm-bindgen",
]
[[package]]
name = "winapi"
version = "0.3.9"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "5c839a674fcd7a98952e593242ea400abe93992746761e38641405d28b00f419"
dependencies = [
"winapi-i686-pc-windows-gnu",
"winapi-x86_64-pc-windows-gnu",
]
[[package]]
name = "winapi-i686-pc-windows-gnu"
version = "0.4.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "ac3b87c63620426dd9b991e5ce0329eff545bccbbb34f3be09ff6fb6ab51b7b6"
[[package]]
name = "winapi-util"
version = "0.1.5"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "70ec6ce85bb158151cae5e5c87f95a8e97d2c0c4b001223f33a334e3ce5de178"
dependencies = [
"winapi",
]
[[package]]
name = "winapi-x86_64-pc-windows-gnu"
version = "0.4.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "712e227841d057c1ee1cd2fb22fa7e5a5461ae8e48fa2ca79ec42cfc1931183f"

View File

@ -8,10 +8,10 @@ edition = "2018"
libm = "0.2.1" libm = "0.2.1"
serde = { version = "1.0", features = ["derive"], default-features = false } serde = { version = "1.0", features = ["derive"], default-features = false }
generic-array = "0.14" generic-array = "0.14"
miniconf = "0.1" num = { version = "0.3.1", default-features = false }
[dev-dependencies] [dev-dependencies]
easybench = "1.0" criterion = "0.3"
rand = "0.8" rand = "0.8"
ndarray = "0.14" ndarray = "0.14"

View File

@ -1,80 +1,68 @@
use core::f32::consts::PI; use core::f32::consts::PI;
use dsp::{atan2, cossin}; use criterion::{black_box, criterion_group, criterion_main, Criterion};
use dsp::{iir, iir_int}; use dsp::{atan2, cossin, iir, iir_int, PLL, RPLL};
use dsp::{pll::PLL, rpll::RPLL};
use easybench::bench_env;
fn atan2_bench() { fn atan2_bench(c: &mut Criterion) {
let xi = (10 << 16) as i32; let xi = (10 << 16) as i32;
let xf = xi as f32 / i32::MAX as f32; let xf = xi as f32 / i32::MAX as f32;
let yi = (-26_328 << 16) as i32; let yi = (-26_328 << 16) as i32;
let yf = yi as f32 / i32::MAX as f32; let yf = yi as f32 / i32::MAX as f32;
println!( c.bench_function("atan2(y, x)", |b| {
"atan2(yi, xi): {}", b.iter(|| atan2(black_box(yi), black_box(xi)))
bench_env((yi, xi), |(yi, xi)| atan2(*yi, *xi)) });
); c.bench_function("y.atan2(x)", |b| {
println!( b.iter(|| black_box(yf).atan2(black_box(xf)))
"yf.atan2(xf): {}", });
bench_env((yf, xf), |(yf, xf)| yf.atan2(*xf))
);
} }
fn cossin_bench() { fn cossin_bench(c: &mut Criterion) {
let zi = -0x7304_2531_i32; let zi = -0x7304_2531_i32;
let zf = zi as f32 / i32::MAX as f32 * PI; let zf = zi as f32 / i32::MAX as f32 * PI;
println!("cossin(zi): {}", bench_env(zi, |zi| cossin(*zi))); c.bench_function("cossin(zi)", |b| b.iter(|| cossin(black_box(zi))));
println!("zf.sin_cos(): {}", bench_env(zf, |zf| zf.sin_cos())); c.bench_function("zf.sin_cos()", |b| b.iter(|| black_box(zf).sin_cos()));
} }
fn rpll_bench() { fn rpll_bench(c: &mut Criterion) {
let mut dut = RPLL::new(8); let mut dut = RPLL::new(8);
println!( c.bench_function("RPLL::update(Some(t), 21, 20)", |b| {
"RPLL::update(Some(t), 21, 20): {}", b.iter(|| dut.update(black_box(Some(0x241)), 21, 20))
bench_env(Some(0x241), |x| dut.update(*x, 21, 20)) });
); c.bench_function("RPLL::update(Some(t), sf, sp)", |b| {
println!( b.iter(|| {
"RPLL::update(Some(t), sf, sp): {}", dut.update(black_box(Some(0x241)), black_box(21), black_box(20))
bench_env((Some(0x241), 21, 20), |(x, p, q)| dut.update(*x, *p, *q)) })
); });
} }
fn pll_bench() { fn pll_bench(c: &mut Criterion) {
let mut dut = PLL::default(); let mut dut = PLL::default();
println!( c.bench_function("PLL::update(t, 12, 11)", |b| {
"PLL::update(t, 12, 12): {}", b.iter(|| dut.update(black_box(0x1234), 12, 1))
bench_env(0x241, |x| dut.update(*x, 12, 12)) });
); c.bench_function("PLL::update(t, sf, sp)", |b| {
println!( b.iter(|| dut.update(black_box(0x241), black_box(21), black_box(20)))
"PLL::update(t, sf, sp): {}", });
bench_env((0x241, 21, 20), |(x, p, q)| dut.update(*x, *p, *q))
);
} }
fn iir_int_bench() { fn iir_int_bench(c: &mut Criterion) {
let dut = iir_int::IIR::default(); let dut = iir_int::IIR::default();
let mut xy = iir_int::Vec5::default(); let mut xy = iir_int::Vec5::default();
println!( c.bench_function("int_iir::IIR::update(s, x)", |b| {
"int_iir::IIR::update(s, x): {}", b.iter(|| dut.update(&mut xy, black_box(0x2832)))
bench_env(0x2832, |x| dut.update(&mut xy, *x)) });
);
} }
fn iir_bench() { fn iir_bench(c: &mut Criterion) {
let dut = iir::IIR::default(); let dut = iir::IIR::default();
let mut xy = iir::Vec5::default(); let mut xy = iir::Vec5::default();
println!( c.bench_function("int::IIR::update(s, x)", |b| {
"int::IIR::update(s, x): {}", b.iter(|| dut.update(&mut xy, black_box(0.32241)))
bench_env(0.32241, |x| dut.update(&mut xy, *x)) });
);
} }
fn main() { criterion_group!(trig, atan2_bench, cossin_bench);
atan2_bench(); criterion_group!(pll, rpll_bench, pll_bench);
cossin_bench(); criterion_group!(iir, iir_int_bench, iir_bench);
rpll_bench(); criterion_main!(trig, pll, iir);
pll_bench();
iir_int_bench();
iir_bench();
}

View File

@ -1,33 +1,29 @@
use core::ops::Mul; pub use num::Complex;
use super::{atan2, cossin}; use super::{atan2, cossin};
#[derive(Copy, Clone, Default, PartialEq, Debug)] /// Complex extension trait offering DSP (fast, good accuracy) functionality.
pub struct Complex<T>(pub T, pub T); pub trait ComplexExt<T, U> {
fn from_angle(angle: T) -> Self;
impl<T: Copy> Complex<T> { fn abs_sqr(&self) -> U;
pub fn map<F>(&self, func: F) -> Self fn log2(&self) -> T;
where fn arg(&self) -> T;
F: Fn(T) -> T,
{
Complex(func(self.0), func(self.1))
}
} }
impl Complex<i32> { impl ComplexExt<i32, u32> for Complex<i32> {
/// Return a Complex on the unit circle given an angle. /// Return a Complex on the unit circle given an angle.
/// ///
/// Example: /// Example:
/// ///
/// ``` /// ```
/// use dsp::Complex; /// use dsp::{Complex, ComplexExt};
/// Complex::<i32>::from_angle(0); /// Complex::<i32>::from_angle(0);
/// Complex::<i32>::from_angle(1 << 30); // pi/2 /// Complex::<i32>::from_angle(1 << 30); // pi/2
/// Complex::<i32>::from_angle(-1 << 30); // -pi/2 /// Complex::<i32>::from_angle(-1 << 30); // -pi/2
/// ``` /// ```
pub fn from_angle(angle: i32) -> Self { fn from_angle(angle: i32) -> Self {
let (c, s) = cossin(angle); let (c, s) = cossin(angle);
Self(c, s) Self { re: c, im: s }
} }
/// Return the absolute square (the squared magnitude). /// Return the absolute square (the squared magnitude).
@ -39,13 +35,13 @@ impl Complex<i32> {
/// Example: /// Example:
/// ///
/// ``` /// ```
/// use dsp::Complex; /// use dsp::{Complex, ComplexExt};
/// assert_eq!(Complex(i32::MIN, 0).abs_sqr(), 1 << 31); /// assert_eq!(Complex::new(i32::MIN, 0).abs_sqr(), 1 << 31);
/// assert_eq!(Complex(i32::MAX, i32::MAX).abs_sqr(), u32::MAX - 3); /// assert_eq!(Complex::new(i32::MAX, i32::MAX).abs_sqr(), u32::MAX - 3);
/// ``` /// ```
pub fn abs_sqr(&self) -> u32 { fn abs_sqr(&self) -> u32 {
(((self.0 as i64) * (self.0 as i64) (((self.re as i64) * (self.re as i64)
+ (self.1 as i64) * (self.1 as i64)) + (self.im as i64) * (self.im as i64))
>> 31) as u32 >> 31) as u32
} }
@ -59,15 +55,15 @@ impl Complex<i32> {
/// Example: /// Example:
/// ///
/// ``` /// ```
/// use dsp::Complex; /// use dsp::{Complex, ComplexExt};
/// assert_eq!(Complex(i32::MAX, i32::MAX).log2(), -1); /// assert_eq!(Complex::new(i32::MAX, i32::MAX).log2(), -1);
/// assert_eq!(Complex(i32::MAX, 0).log2(), -2); /// assert_eq!(Complex::new(i32::MAX, 0).log2(), -2);
/// assert_eq!(Complex(1, 0).log2(), -63); /// assert_eq!(Complex::new(1, 0).log2(), -63);
/// assert_eq!(Complex(0, 0).log2(), -64); /// assert_eq!(Complex::new(0, 0).log2(), -64);
/// ``` /// ```
pub fn log2(&self) -> i32 { fn log2(&self) -> i32 {
let a = (self.0 as i64) * (self.0 as i64) let a = (self.re as i64) * (self.re as i64)
+ (self.1 as i64) * (self.1 as i64); + (self.im as i64) * (self.im as i64);
-(a.leading_zeros() as i32) -(a.leading_zeros() as i32)
} }
@ -78,52 +74,51 @@ impl Complex<i32> {
/// Example: /// Example:
/// ///
/// ``` /// ```
/// use dsp::Complex; /// use dsp::{Complex, ComplexExt};
/// assert_eq!(Complex(1, 0).arg(), 0); /// assert_eq!(Complex::new(1, 0).arg(), 0);
/// assert_eq!(Complex(-i32::MAX, 1).arg(), i32::MAX); /// assert_eq!(Complex::new(-i32::MAX, 1).arg(), i32::MAX);
/// assert_eq!(Complex(-i32::MAX, -1).arg(), -i32::MAX); /// assert_eq!(Complex::new(-i32::MAX, -1).arg(), -i32::MAX);
/// assert_eq!(Complex(0, -1).arg(), -i32::MAX >> 1); /// assert_eq!(Complex::new(0, -1).arg(), -i32::MAX >> 1);
/// assert_eq!(Complex(0, 1).arg(), (i32::MAX >> 1) + 1); /// assert_eq!(Complex::new(0, 1).arg(), (i32::MAX >> 1) + 1);
/// assert_eq!(Complex(1, 1).arg(), (i32::MAX >> 2) + 1); /// assert_eq!(Complex::new(1, 1).arg(), (i32::MAX >> 2) + 1);
/// ``` /// ```
pub fn arg(&self) -> i32 { fn arg(&self) -> i32 {
atan2(self.1, self.0) atan2(self.im, self.re)
} }
} }
impl Mul for Complex<i32> { /// Full scale fixed point multiplication.
type Output = Self; pub trait MulScaled<T> {
fn mul_scaled(self, other: T) -> Self;
}
fn mul(self, other: Self) -> Self { impl MulScaled<Complex<i32>> for Complex<i32> {
let a = self.0 as i64; fn mul_scaled(self, other: Self) -> Self {
let b = self.1 as i64; let a = self.re as i64;
let c = other.0 as i64; let b = self.im as i64;
let d = other.1 as i64; let c = other.re as i64;
Complex( let d = other.im as i64;
((a * c - b * d + (1 << 31)) >> 32) as i32, Complex {
((b * c + a * d + (1 << 31)) >> 32) as i32, re: ((a * c - b * d + (1 << 30)) >> 31) as i32,
) im: ((b * c + a * d + (1 << 30)) >> 31) as i32,
}
} }
} }
impl Mul<i32> for Complex<i32> { impl MulScaled<i32> for Complex<i32> {
type Output = Self; fn mul_scaled(self, other: i32) -> Self {
Complex {
fn mul(self, other: i32) -> Self { re: ((other as i64 * self.re as i64 + (1 << 30)) >> 31) as i32,
Complex( im: ((other as i64 * self.im as i64 + (1 << 30)) >> 31) as i32,
((other as i64 * self.0 as i64 + (1 << 31)) >> 32) as i32, }
((other as i64 * self.1 as i64 + (1 << 31)) >> 32) as i32,
)
} }
} }
impl Mul<i16> for Complex<i32> { impl MulScaled<i16> for Complex<i32> {
type Output = Self; fn mul_scaled(self, other: i16) -> Self {
Complex {
fn mul(self, other: i16) -> Self { re: (other as i32 * (self.re >> 16) + (1 << 14)) >> 15,
Complex( im: (other as i32 * (self.im >> 16) + (1 << 14)) >> 15,
(other as i32 * (self.0 >> 16) + (1 << 15)) >> 16, }
(other as i32 * (self.1 >> 16) + (1 << 15)) >> 16,
)
} }
} }

View File

@ -74,7 +74,6 @@ pub fn cossin(phase: i32) -> (i32, i32) {
#[cfg(test)] #[cfg(test)]
mod tests { mod tests {
use super::*; use super::*;
use crate::Complex;
use core::f64::consts::PI; use core::f64::consts::PI;
#[test] #[test]
@ -82,11 +81,11 @@ mod tests {
// Constant amplitude error due to LUT data range. // Constant amplitude error due to LUT data range.
const AMPLITUDE: f64 = ((1i64 << 31) - (1i64 << 15)) as _; const AMPLITUDE: f64 = ((1i64 << 31) - (1i64 << 15)) as _;
const MAX_PHASE: f64 = (1i64 << 32) as _; const MAX_PHASE: f64 = (1i64 << 32) as _;
let mut rms_err = Complex(0f64, 0f64); let mut rms_err = (0f64, 0f64);
let mut sum_err = Complex(0f64, 0f64); let mut sum_err = (0f64, 0f64);
let mut max_err = Complex(0f64, 0f64); let mut max_err = (0f64, 0f64);
let mut sum = Complex(0f64, 0f64); let mut sum = (0f64, 0f64);
let mut demod = Complex(0f64, 0f64); let mut demod = (0f64, 0f64);
// use std::{fs::File, io::{BufWriter, prelude::*}, path::Path}; // use std::{fs::File, io::{BufWriter, prelude::*}, path::Path};
// let mut file = BufWriter::new(File::create(Path::new("data.bin")).unwrap()); // let mut file = BufWriter::new(File::create(Path::new("data.bin")).unwrap());

View File

@ -1,101 +1,28 @@
#![cfg_attr(not(test), no_std)] #![cfg_attr(not(test), no_std)]
#![cfg_attr(feature = "nightly", feature(asm, core_intrinsics))] #![cfg_attr(feature = "nightly", feature(asm, core_intrinsics))]
use core::ops::{Add, Mul, Neg}; mod tools;
pub use tools::*;
fn abs<T>(x: T) -> T
where
T: PartialOrd + Default + Neg<Output = T>,
{
if x >= T::default() {
x
} else {
-x
}
}
// These are implemented here because core::f32 doesn't have them (yet).
// They are naive and don't handle inf/nan.
// `compiler-intrinsics`/llvm should have better (robust, universal, and
// faster) implementations.
fn copysign<T>(x: T, y: T) -> T
where
T: PartialOrd + Default + Neg<Output = T>,
{
if (x >= T::default() && y >= T::default())
|| (x <= T::default() && y <= T::default())
{
x
} else {
-x
}
}
#[cfg(not(feature = "nightly"))]
fn max<T>(x: T, y: T) -> T
where
T: PartialOrd,
{
if x > y {
x
} else {
y
}
}
#[cfg(not(feature = "nightly"))]
fn min<T>(x: T, y: T) -> T
where
T: PartialOrd,
{
if x < y {
x
} else {
y
}
}
#[cfg(feature = "nightly")]
fn max(x: f32, y: f32) -> f32 {
core::intrinsics::maxnumf32(x, y)
}
#[cfg(feature = "nightly")]
fn min(x: f32, y: f32) -> f32 {
core::intrinsics::minnumf32(x, y)
}
// Multiply-accumulate vectors `x` and `a`.
//
// A.k.a. dot product.
// Rust/LLVM optimize this nicely.
fn macc<T>(y0: T, x: &[T], a: &[T]) -> T
where
T: Add<Output = T> + Mul<Output = T> + Copy,
{
x.iter()
.zip(a)
.map(|(x, a)| *x * *a)
.fold(y0, |y, xa| y + xa)
}
pub mod accu;
mod atan2; mod atan2;
pub use atan2::*;
mod accu;
pub use accu::*;
mod complex; mod complex;
pub use complex::*;
mod cossin; mod cossin;
pub use cossin::*;
pub mod iir; pub mod iir;
pub mod iir_int; pub mod iir_int;
pub mod lockin; mod lockin;
pub mod lowpass; pub use lockin::*;
pub mod pll; mod lowpass;
pub mod rpll; pub use lowpass::*;
pub mod unwrap; mod pll;
pub use pll::*;
pub use accu::Accu; mod rpll;
pub use atan2::atan2; pub use rpll::*;
pub use complex::Complex; mod unwrap;
pub use cossin::cossin; pub use unwrap::*;
#[cfg(test)] #[cfg(test)]
pub mod testing; pub mod testing;

View File

@ -1,4 +1,4 @@
use super::{lowpass::Lowpass, Complex}; use super::{Complex, ComplexExt, Lowpass, MulScaled};
use generic_array::typenum::U2; use generic_array::typenum::U2;
#[derive(Clone, Default)] #[derive(Clone, Default)]
@ -8,19 +8,15 @@ pub struct Lockin {
impl Lockin { impl Lockin {
/// Update the lockin with a sample taken at a given phase. /// Update the lockin with a sample taken at a given phase.
/// The lowpass has a gain of `1 << k`. pub fn update(&mut self, sample: i32, phase: i32, k: u8) -> Complex<i32> {
pub fn update(&mut self, sample: i16, phase: i32, k: u8) -> Complex<i32> { // Get the LO signal for demodulation and mix the sample;
// Get the LO signal for demodulation. let mix = Complex::from_angle(phase).mul_scaled(sample);
let lo = Complex::from_angle(phase);
// Mix with the LO signal
let mix = lo * sample;
// Filter with the IIR lowpass, // Filter with the IIR lowpass,
// return IQ (in-phase and quadrature) data. // return IQ (in-phase and quadrature) data.
Complex( Complex {
self.state[0].update(mix.0, k), re: self.state[0].update(mix.re, k),
self.state[1].update(mix.1, k), im: self.state[1].update(mix.im, k),
) }
} }
} }

View File

@ -14,19 +14,20 @@ impl<N: ArrayLength<i32>> Lowpass<N> {
/// Update the filter with a new sample. /// Update the filter with a new sample.
/// ///
/// # Args /// # Args
/// * `x`: Input data, needs `k` bits headroom. /// * `x`: Input data. Needs 1 bit headroom but will saturate cleanly beyond that.
/// * `k`: Log2 time constant, 0..31. /// * `k`: Log2 time constant, 1..=31.
/// ///
/// # Return /// # Return
/// Filtered output y, with gain of `1 << k`. /// Filtered output y.
pub fn update(&mut self, x: i32, k: u8) -> i32 { pub fn update(&mut self, x: i32, k: u8) -> i32 {
debug_assert!(k & 31 == k); debug_assert!(k & 31 == k);
debug_assert!((k - 1) & 31 == k - 1);
// This is an unrolled and optimized first-order IIR loop // This is an unrolled and optimized first-order IIR loop
// that works for all possible time constants. // that works for all possible time constants.
// Note DF-II and the zeros at Nyquist. // Note T-DF-I and the zeros at Nyquist.
let mut x = x << k; let mut x = x;
for y in self.y.iter_mut() { for y in self.y.iter_mut() {
let dy = (x - *y + (1 << (k - 1))) >> k; let dy = x.saturating_sub(*y).saturating_add(1 << (k - 1)) >> k;
*y += dy; *y += dy;
x = *y - (dy >> 1); x = *y - (dy >> 1);
} }

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@ -31,7 +31,7 @@ pub fn complex_isclose(
rtol: f32, rtol: f32,
atol: f32, atol: f32,
) -> bool { ) -> bool {
isclosef(a.0, b.0, rtol, atol) && isclosef(a.1, b.1, rtol, atol) isclosef(a.re, b.re, rtol, atol) && isclosef(a.im, b.im, rtol, atol)
} }
pub fn complex_allclose( pub fn complex_allclose(

95
dsp/src/tools.rs Normal file
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@ -0,0 +1,95 @@
use core::ops::{Add, Mul, Neg};
pub fn abs<T>(x: T) -> T
where
T: PartialOrd + Default + Neg<Output = T>,
{
if x >= T::default() {
x
} else {
-x
}
}
// These are implemented here because core::f32 doesn't have them (yet).
// They are naive and don't handle inf/nan.
// `compiler-intrinsics`/llvm should have better (robust, universal, and
// faster) implementations.
pub fn copysign<T>(x: T, y: T) -> T
where
T: PartialOrd + Default + Neg<Output = T>,
{
if (x >= T::default() && y >= T::default())
|| (x <= T::default() && y <= T::default())
{
x
} else {
-x
}
}
#[cfg(not(feature = "nightly"))]
pub fn max<T>(x: T, y: T) -> T
where
T: PartialOrd,
{
if x > y {
x
} else {
y
}
}
#[cfg(not(feature = "nightly"))]
pub fn min<T>(x: T, y: T) -> T
where
T: PartialOrd,
{
if x < y {
x
} else {
y
}
}
#[cfg(feature = "nightly")]
pub fn max(x: f32, y: f32) -> f32 {
core::intrinsics::maxnumf32(x, y)
}
#[cfg(feature = "nightly")]
pub fn min(x: f32, y: f32) -> f32 {
core::intrinsics::minnumf32(x, y)
}
// Multiply-accumulate vectors `x` and `a`.
//
// A.k.a. dot product.
// Rust/LLVM optimize this nicely.
pub fn macc<T>(y0: T, x: &[T], a: &[T]) -> T
where
T: Add<Output = T> + Mul<Output = T> + Copy,
{
x.iter()
.zip(a)
.map(|(x, a)| *x * *a)
.fold(y0, |y, xa| y + xa)
}
/// Combine high and low i32 into a single downscaled i32, saturating the type.
pub fn saturating_scale(lo: i32, hi: i32, shift: u32) -> i32 {
debug_assert!(shift & 31 == shift);
let shift_hi = 31 - shift;
debug_assert!(shift_hi & 31 == shift_hi);
let over = hi >> shift;
if over < -1 {
i32::MIN
} else if over > 0 {
i32::MAX
} else {
(lo >> shift) + (hi << shift_hi)
}
}

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@ -6,7 +6,7 @@ use stm32h7xx_hal as hal;
use stabilizer::{hardware, hardware::design_parameters}; use stabilizer::{hardware, hardware::design_parameters};
use dsp::{lockin::Lockin, rpll::RPLL, Accu}; use dsp::{Accu, Complex, ComplexExt, Lockin, RPLL};
use hardware::{ use hardware::{
Adc0Input, Adc1Input, Dac0Output, Dac1Output, InputStamper, AFE0, AFE1, Adc0Input, Adc1Input, Dac0Output, Dac1Output, InputStamper, AFE0, AFE1,
}; };
@ -110,22 +110,33 @@ const APP: () = {
let sample_phase = let sample_phase =
phase_offset.wrapping_add(pll_phase.wrapping_mul(harmonic)); phase_offset.wrapping_add(pll_phase.wrapping_mul(harmonic));
let output = adc_samples[0] let output: Complex<i32> = adc_samples[0]
.iter() .iter()
// Zip in the LO phase.
.zip(Accu::new(sample_phase, sample_frequency)) .zip(Accu::new(sample_phase, sample_frequency))
// Convert to signed, MSB align the ADC sample. // Convert to signed, MSB align the ADC sample, update the Lockin (demodulate, filter)
.map(|(&sample, phase)| { .map(|(&sample, phase)| {
lockin.update(sample as i16, phase, time_constant) let s = (sample as i16 as i32) << 16;
lockin.update(s, phase, time_constant)
}) })
// Decimate
.last() .last()
.unwrap(); .unwrap()
* 2; // Full scale assuming the 2f component is gone.
let conf = "frequency_discriminator"; #[allow(dead_code)]
enum Conf {
PowerPhase,
FrequencyDiscriminator,
Quadrature,
}
let conf = Conf::FrequencyDiscriminator; // TODO: expose
let output = match conf { let output = match conf {
// Convert from IQ to power and phase. // Convert from IQ to power and phase.
"power_phase" => [(output.log2() << 24) as _, output.arg()], Conf::PowerPhase => [(output.log2() << 24) as _, output.arg()],
"frequency_discriminator" => [pll_frequency as _, output.arg()], Conf::FrequencyDiscriminator => [pll_frequency as _, output.arg()],
_ => [output.0, output.1], Conf::Quadrature => [output.re, output.im],
}; };
// Convert to DAC data. // Convert to DAC data.

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@ -2,7 +2,7 @@
#![no_std] #![no_std]
#![no_main] #![no_main]
use dsp::{lockin::Lockin, Accu}; use dsp::{Accu, Complex, ComplexExt, Lockin};
use hardware::{Adc1Input, Dac0Output, Dac1Output, AFE0, AFE1}; use hardware::{Adc1Input, Dac0Output, Dac1Output, AFE0, AFE1};
use stabilizer::{hardware, hardware::design_parameters}; use stabilizer::{hardware, hardware::design_parameters};
@ -95,17 +95,19 @@ const APP: () = {
let sample_phase = phase_offset let sample_phase = phase_offset
.wrapping_add((pll_phase as i32).wrapping_mul(harmonic)); .wrapping_add((pll_phase as i32).wrapping_mul(harmonic));
let output = adc_samples let output: Complex<i32> = adc_samples
.iter() .iter()
// Zip in the LO phase. // Zip in the LO phase.
.zip(Accu::new(sample_phase, sample_frequency)) .zip(Accu::new(sample_phase, sample_frequency))
// Convert to signed, MSB align the ADC sample, update the Lockin (demodulate, filter) // Convert to signed, MSB align the ADC sample, update the Lockin (demodulate, filter)
.map(|(&sample, phase)| { .map(|(&sample, phase)| {
lockin.update(sample as i16, phase, time_constant) let s = (sample as i16 as i32) << 16;
lockin.update(s, phase, time_constant)
}) })
// Decimate // Decimate
.last() .last()
.unwrap(); .unwrap()
* 2; // Full scale assuming the 2f component is gone.
for value in dac_samples[1].iter_mut() { for value in dac_samples[1].iter_mut() {
*value = (output.arg() >> 16) as u16 ^ 0x8000; *value = (output.arg() >> 16) as u16 ^ 0x8000;