590 lines
18 KiB
Rust
590 lines
18 KiB
Rust
#![allow(dead_code)]
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mod bfsk;
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mod complex;
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pub mod fft;
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mod filtering;
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mod iq;
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mod math;
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mod nco;
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mod squelch;
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mod ted;
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mod units;
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mod windows;
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use egui_plot::{Legend, Line, Plot};
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use hound::WavWriter;
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use rand::{Rng, rand_core::le, seq::index::sample};
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use std::{
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cell::{Cell, RefCell},
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collections::VecDeque,
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env::{self, args},
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fs::File,
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io::{BufWriter, Sink, Write, stdout},
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ops::DerefMut,
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sync::Arc,
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time::Duration,
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};
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use tokio::{join, net::UdpSocket, select, sync::mpsc::error::TryRecvError, time::timeout};
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use crate::{
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bfsk::BFSKMod,
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complex::Complex32,
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filtering::{dc_block::DCBlocker, fir::FIRFilter},
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iq::IQSampler,
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nco::Nco,
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ted::elg::ELGate,
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units::frequency::hz_to_rad_per_sample,
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};
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use eframe::egui::{self, CentralPanel, Color32, debug_text::print};
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use tokio::sync::RwLock;
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use tokio::sync::mpsc::{Receiver, Sender, channel};
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const BAUD_RATE: u32 = 1000;
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const SAMPLE_RATE: u32 = 48000;
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// Modulation parameters
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const CENTER_FREQ: f32 = 1700.;
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const DEVIATION: f32 = 500.;
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pub enum SampleSenderCommand {
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Open,
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Close,
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Sample(f32),
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}
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pub trait SampleSender {
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async fn open_link(&mut self);
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async fn send_sample(&mut self, sample: f32);
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async fn close_link(&mut self);
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}
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struct WavSampleSender {
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writer: Option<WavWriter<BufWriter<File>>>,
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}
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impl Default for WavSampleSender {
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fn default() -> Self {
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Self { writer: None }
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}
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}
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impl SampleSender for WavSampleSender {
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async fn open_link(&mut self) {
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let spec = hound::WavSpec {
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channels: 1,
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sample_rate: SAMPLE_RATE,
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bits_per_sample: 16,
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sample_format: hound::SampleFormat::Int,
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};
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self.writer = Some(hound::WavWriter::create("audio/modulated.wav", spec).unwrap());
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}
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async fn send_sample(&mut self, sample: f32) {
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let out_sample = (sample * i16::MAX as f32) as i16;
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self.writer
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.as_mut()
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.unwrap()
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.write_sample(out_sample)
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.unwrap();
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}
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async fn close_link(&mut self) {
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self.writer = None;
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}
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}
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struct Transceiver {
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tx_stream: Sender<Vec<u8>>,
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rx_stream: Receiver<Vec<u8>>,
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eye_receiver: Receiver<Vec<f32>>,
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}
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impl Transceiver {
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pub async fn send(&self, data: Vec<u8>) {
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self.tx_stream.send(data).await;
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}
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pub fn get_sender(&self) -> Sender<Vec<u8>> {
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self.tx_stream.clone()
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}
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pub fn try_recv(&mut self) -> Result<Vec<u8>, TryRecvError> {
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self.rx_stream.try_recv()
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}
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pub fn try_recv_eye(&mut self) -> Result<Vec<f32>, TryRecvError> {
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self.eye_receiver.try_recv()
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}
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pub fn start(
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mut sample_stream: Receiver<f32>,
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mut sample_sender: Sender<SampleSenderCommand>,
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) -> Self {
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let (mut eyes_tx, eyes_rx) = channel::<Vec<f32>>(1024);
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let (rx_stream_sender, rx_stream_receiver) = channel::<Vec<u8>>(1024);
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let (tx_stream_sender, mut tx_stream_receiver) = channel::<Vec<u8>>(1024);
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tokio::spawn(async move {
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let squelch_sum = 0.;
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loop {}
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});
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Self {
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eye_receiver: eyes_rx,
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tx_stream: tx_stream_sender,
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rx_stream: rx_stream_receiver,
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}
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}
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async fn squelch_detector(sample_stream: &mut Receiver<f32>) {
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let length = 200;
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let level = 0.4;
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let mut iq_sampler = IQSampler::new(hz_to_rad_per_sample(CENTER_FREQ, SAMPLE_RATE as f32));
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let mut squelch_sum = 0.;
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let mut i = 0;
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while let Some(smpl) = sample_stream.recv().await {
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let iq = iq_sampler.sample(smpl);
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squelch_sum += iq.mag() / length as f32;
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i += 1;
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if i >= length {
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if squelch_sum >= level {
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return;
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}
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i = 0;
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squelch_sum = 0.;
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}
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}
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}
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pub async fn transmit(frame: Frame, samples_sender: &mut Sender<SampleSenderCommand>) {
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let bytes = frame.bytes();
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let mut bit_stream = bytes.iter().flat_map(|x| byte_to_bits(*x));
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let modulator = BFSKMod::new(
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(SAMPLE_RATE as f32 / BAUD_RATE as f32).round() as u32,
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hz_to_rad_per_sample(DEVIATION, SAMPLE_RATE as f32),
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&mut bit_stream,
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);
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let up_lo = Nco::new(hz_to_rad_per_sample(CENTER_FREQ, SAMPLE_RATE as f32));
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samples_sender.send(SampleSenderCommand::Open).await;
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for (m, up) in modulator.zip(up_lo) {
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let sample = m * up;
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samples_sender
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.send(SampleSenderCommand::Sample(sample.re))
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.await;
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}
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samples_sender.send(SampleSenderCommand::Close).await;
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}
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async fn receive(
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sample_stream: &mut Receiver<f32>,
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eye_sender: &mut Sender<Vec<f32>>,
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) -> Result<Frame, FrameConstructionError> {
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let mut iq_sampler = IQSampler::new(hz_to_rad_per_sample(CENTER_FREQ, SAMPLE_RATE as f32));
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let samples_per_symbol = (SAMPLE_RATE as f32) / (BAUD_RATE as f32);
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let correllator_length = samples_per_symbol as usize;
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let mut pos_nco = Nco::new(hz_to_rad_per_sample(DEVIATION, SAMPLE_RATE as f32));
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let mut neg_nco = Nco::new(hz_to_rad_per_sample(-DEVIATION, SAMPLE_RATE as f32));
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let pos_ir = (0..correllator_length).map(|i| {
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pos_nco.step();
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pos_nco.cexp() * windows::blackmann(i as f32 / correllator_length as f32)
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});
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let neg_ir = (0..correllator_length).map(|i| {
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neg_nco.step();
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neg_nco.cexp() * windows::blackmann(i as f32 / correllator_length as f32)
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});
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let mut pos_correllator = FIRFilter::new(&pos_ir.collect::<Vec<_>>());
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let mut neg_correllator = FIRFilter::new(&neg_ir.collect::<Vec<_>>());
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pos_correllator.normalize_freq(hz_to_rad_per_sample(DEVIATION, SAMPLE_RATE as f32));
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neg_correllator.normalize_freq(hz_to_rad_per_sample(-DEVIATION, SAMPLE_RATE as f32));
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let mut matched_lowpass = FIRFilter::new(&vec![
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Complex32::new(1., 0.);
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samples_per_symbol as usize / 2
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]);
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matched_lowpass.normalize_freq(hz_to_rad_per_sample(DEVIATION, SAMPLE_RATE as f32));
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//let mut dc_block = DCBlocker::new(0.999);
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let mut dc_block = DCBlocker::new(1.);
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let loop_i = 0.0;
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let loop_p = 0.1;
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let mut loop_ir = vec![Complex32::new(loop_i, 0.); samples_per_symbol as usize];
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loop_ir.push(Complex32::new(loop_p, 0.));
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let mut elg = ELGate::new(samples_per_symbol, FIRFilter::new(&loop_ir));
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// Frame reconstruction
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let mut last_byte = 0x00u8;
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let mut frame_constructor = FrameConstructor::new();
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let mut bit_count: Option<u32> = None;
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while let Some(sample) = sample_stream.recv().await {
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let iq = iq_sampler.sample(sample);
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let matched =
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matched_lowpass
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.next_real(dc_block.next_real(
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pos_correllator.next(iq).mag() - neg_correllator.next(iq).mag(),
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));
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if let Some((bit_sample, eye)) = elg.next_eye(matched) {
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let _ = eye_sender.send(eye).await;
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last_byte >>= 1;
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last_byte |= ((bit_sample > 0.) as u8) << 7;
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//last_byte <<= 1;
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//last_byte |= ((bit_sample < 0.) as u8);
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bit_count = bit_count.map(|x| x + 1);
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if let None = bit_count
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&& last_byte == 0xD8
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{
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// Potential frame starts
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last_byte = 0;
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frame_constructor = FrameConstructor::new();
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bit_count = Some(0);
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}
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if let Some(8) = bit_count {
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let frame_opt = frame_constructor.add_byte(last_byte);
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bit_count = Some(0);
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//print!("{}", last_byte as char);
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print!(".{:x}.", last_byte);
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let _ = std::io::stdout().flush();
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if let Ok(Some(Frame(ref frame_data))) = frame_opt {
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println!("Got data");
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return Ok(Frame(frame_data.to_vec()));
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}
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if let Err(()) = frame_opt {
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// Erroneous frame
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println!("Error");
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return Err(());
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}
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}
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}
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}
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return Err(());
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}
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}
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struct Frame(Vec<u8>);
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type FrameConstructionError = ();
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pub struct FrameConstructor {
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frame: Vec<u8>,
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frame_countdown: Option<u16>,
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checksum: u8,
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started: bool,
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}
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impl FrameConstructor {
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pub fn new() -> Self {
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Self {
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frame: Vec::new(),
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frame_countdown: None,
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checksum: 0u8,
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started: false,
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}
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}
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pub fn add_byte(&mut self, byte: u8) -> Result<Option<Frame>, FrameConstructionError> {
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if self.frame.is_empty() && byte != 0x4C && !self.started {
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println!("Wrong type {:x}", byte);
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self.started = true;
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return Err(());
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}
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if self.frame.is_empty() && byte == 0x4C && !self.started {
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self.started = true;
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return Ok(None);
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}
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self.frame.push(byte);
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// Retrieve length
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if self.frame.len() == 1 {
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self.frame_countdown = Some(self.frame[0] as u16);
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return Ok(None);
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}
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if self.frame.len() == 2 {
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*self.frame_countdown.as_mut().unwrap() |= (self.frame[1] as u16) << 8;
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return Ok(None);
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}
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if self.frame_countdown.unwrap() == 0 {
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// All data has been received
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if self.checksum == byte {
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return Ok(Some(Frame(self.frame.iter().skip(2).copied().collect())));
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}
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println!("Checksum failed");
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return Err(());
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}
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//self.frame.push(byte);
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self.checksum ^= byte;
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*self.frame_countdown.as_mut().unwrap() -= 1;
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Ok(None)
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}
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}
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impl Frame {
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pub fn bytes(&self) -> Vec<u8> {
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let mut output_bytes = vec![];
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// Initial training sequence
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output_bytes.append(&mut vec![0b01010101; 64]);
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// Preamble byte
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output_bytes.push(0xD8);
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let x = &self.0;
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assert!(x.len() < 65536, "Data size over MTU");
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output_bytes.push(0x4C); // DATA FRAME
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let len_u16 = x.len() as u16;
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output_bytes.push((len_u16 & 0xFF).try_into().unwrap());
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output_bytes.push(((len_u16 >> 8) & 0xFF).try_into().unwrap());
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let mut checksum = 0u8;
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x.iter().for_each(|x| checksum ^= x);
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output_bytes.extend(x.iter());
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output_bytes.push(checksum);
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// SEND EOT
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output_bytes.extend(std::iter::repeat_n(4, 32));
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output_bytes
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}
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}
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#[tokio::main]
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async fn main() {
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//Transceiver::transmit(Frame::Data("Skibditoilet".repeat(100).bytes().collect::<Vec<_>>()), &mut WavSampleSender{}).await;
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//Transceiver::transmit(Frame::Ack, &mut WavSampleSender::default()).await;
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//return;
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let native_options = eframe::NativeOptions::default();
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let _ = eframe::run_native(
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"Egui",
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native_options,
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Box::new(|cc| Ok(Box::new(EguiApp::new(cc)))),
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);
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}
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//#[derive(Default)]
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struct DummySampleSender();
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impl SampleSender for DummySampleSender {
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async fn open_link(&mut self) {}
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async fn send_sample(&mut self, _sample: f32) {}
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async fn close_link(&mut self) {}
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}
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struct EguiApp {
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a_transceiver: Transceiver,
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b_transceiver: Transceiver,
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eyes_a: VecDeque<Vec<f32>>,
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eyes_b: VecDeque<Vec<f32>>,
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}
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impl EguiApp {
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fn new(_cc: &eframe::CreationContext<'_>) -> Self {
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let (up_a_sender, mut up_a_receiver) = channel::<SampleSenderCommand>(1024);
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let (down_a_sender, down_a_receiver) = channel::<f32>(1024);
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let (up_b_sender, mut up_b_receiver) = channel::<SampleSenderCommand>(1024);
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let (down_b_sender, down_b_receiver) = channel::<f32>(1024);
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let (a2b_tx, mut a2b_rx) = channel::<f32>(1024);
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let (b2a_tx, mut b2a_rx) = channel::<f32>(1024);
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let a_txrx = Transceiver::start(down_a_receiver, up_a_sender);
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let b_txrx = Transceiver::start(down_b_receiver, up_b_sender);
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// A dummy channel
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tokio::spawn(async move {
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//let rng = rand::thread_rng();
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let mut sending = false;
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loop {
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let noise = rand::random::<f32>() * 0.1;
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let mut sample = 0.;
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match up_a_receiver.try_recv() {
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Ok(SampleSenderCommand::Open) => {
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sending = true;
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println!("open");
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}
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Ok(SampleSenderCommand::Close) => {
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sending = false;
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println!("close");
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}
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Ok(SampleSenderCommand::Sample(x)) => {
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sample = x;
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}
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_ => {}
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}
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if sending {
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// Flush receiver buffer but ignore
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while let Ok(_) = b2a_rx.try_recv() {}
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// Send to other
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a2b_tx.send(sample + noise).await;
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} else if let Ok(down_sample) = b2a_rx.try_recv() {
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down_a_sender.send(down_sample).await;
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}
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}
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});
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// B dummy channel
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tokio::spawn(async move {
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let mut sending = false;
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loop {
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let noise = rand::random::<f32>() * 0.1;
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let mut sample = 0.;
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match up_b_receiver.try_recv() {
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Ok(SampleSenderCommand::Open) => {
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sending = true;
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}
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Ok(SampleSenderCommand::Close) => {
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sending = false;
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}
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Ok(SampleSenderCommand::Sample(x)) => {
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sample = x;
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}
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_ => {}
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}
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if sending {
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// Flush receiver buffer but ignore
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while let Ok(_) = a2b_rx.try_recv() {}
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// Send to other
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b2a_tx.send(sample + noise).await;
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} else if let Ok(down_sample) = a2b_rx.try_recv() {
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down_b_sender.send(down_sample).await;
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}
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}
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});
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EguiApp {
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a_transceiver: a_txrx,
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b_transceiver: b_txrx,
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eyes_a: VecDeque::new(),
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eyes_b: VecDeque::new(),
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}
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}
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}
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impl eframe::App for EguiApp {
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fn update(&mut self, ctx: &egui::Context, _frame: &mut eframe::Frame) {
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egui::CentralPanel::default().show(ctx, |ui| {
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let max_eyes = 100;
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while let Ok(eye) = self.a_transceiver.try_recv_eye() {
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self.eyes_a.push_back(eye);
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}
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while self.eyes_a.len() > max_eyes {
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self.eyes_a.pop_front();
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}
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while let Ok(eye) = self.b_transceiver.try_recv_eye() {
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self.eyes_b.push_back(eye);
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}
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while self.eyes_b.len() > max_eyes {
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self.eyes_b.pop_front();
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}
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ui.columns(2, |uis| {
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Plot::new("EyeA")
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.legend(Legend::default())
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.show(&mut uis[0], |plot_ui| {
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//plot_ui.set_auto_bounds(Vec2b { x: false, y: false });
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for eye in self.eyes_a.iter() {
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let line = Line::new(
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"EyeA",
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eye.iter()
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.enumerate()
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|
.map(|(i, x)| [i as f64, *x as f64])
|
|
.collect::<Vec<_>>(),
|
|
)
|
|
.color(Color32::LIGHT_GREEN);
|
|
plot_ui.line(line);
|
|
}
|
|
});
|
|
|
|
if uis[0].button("Start").clicked() {
|
|
let snd = self.a_transceiver.get_sender();
|
|
tokio::spawn(async move {
|
|
let _ = snd
|
|
.send("Skibditoilet".repeat(10).as_bytes().to_vec())
|
|
.await;
|
|
});
|
|
}
|
|
|
|
Plot::new("EyeB")
|
|
.legend(Legend::default())
|
|
.show(&mut uis[1], |plot_ui| {
|
|
//plot_ui.set_auto_bounds(Vec2b { x: false, y: false });
|
|
for eye in self.eyes_b.iter() {
|
|
let line = Line::new(
|
|
"EyeB",
|
|
eye.iter()
|
|
.enumerate()
|
|
.map(|(i, x)| [i as f64, *x as f64])
|
|
.collect::<Vec<_>>(),
|
|
)
|
|
.color(Color32::LIGHT_GREEN);
|
|
plot_ui.line(line);
|
|
}
|
|
});
|
|
|
|
if uis[1].button("Start").clicked() {
|
|
let snd = self.b_transceiver.get_sender();
|
|
tokio::spawn(async move {
|
|
let _ = snd
|
|
.send("Skibditoilet".repeat(10).as_bytes().to_vec())
|
|
.await;
|
|
});
|
|
}
|
|
});
|
|
}); // Central panel
|
|
|
|
std::thread::sleep(Duration::from_millis(16));
|
|
ctx.request_repaint();
|
|
}
|
|
}
|
|
|
|
fn byte_to_bits(byte: u8) -> Vec<bool> {
|
|
vec![
|
|
byte & 1 == 1,
|
|
(byte >> 1) & 1 == 1,
|
|
(byte >> 2) & 1 == 1,
|
|
(byte >> 3) & 1 == 1,
|
|
(byte >> 4) & 1 == 1,
|
|
(byte >> 5) & 1 == 1,
|
|
(byte >> 6) & 1 == 1,
|
|
(byte >> 7) & 1 == 1,
|
|
]
|
|
}
|
|
|
|
fn bits_to_byte(bits: &[bool]) -> u8 {
|
|
bits[0] as u8
|
|
| (bits[1] as u8) << 1
|
|
| (bits[2] as u8) << 2
|
|
| (bits[3] as u8) << 3
|
|
| (bits[4] as u8) << 4
|
|
| (bits[5] as u8) << 5
|
|
| (bits[6] as u8) << 6
|
|
| (bits[7] as u8) << 7
|
|
}
|