port more from osmocom-analog

.envrc

@@ -0,0 +1 @@
+use flake

.gitignore

@@ -8,3 +8,6 @@ target/
 
 # MSVC Windows builds of rustc generate these, which store debugging information
 *.pdb
+
+# Direnv
+.direnv/

amps-handset-emu/src/audio.rs

@@ -1,20 +1,34 @@
-use cpal::{StreamConfig, traits::{DeviceTrait, HostTrait}};
+use cpal::traits::{DeviceTrait, HostTrait, StreamTrait};
+use std::sync::{Arc, Mutex};
 
 pub fn play_audio(signal: &[f32]) -> Result<(), Box<dyn std::error::Error>> {
     let host = cpal::default_host();
-    let device = host.default_output_device()?.config();
+    let device = host.default_output_device().ok_or("No output device found")?;
     let config = device.default_output_config()?.config();
 
+    let signal = Arc::new(Mutex::new(signal.to_vec()));
+    let singal_clone = Arc::clone(&signal);
+    let mut index = 0;
+
     let stream = device.build_output_stream(
         &config,
         move |data: &mut [f32], _: &cpal::OutputCallbackInfo| {
-            data.copy_from_slice(&signal[..data.len()]);
+            let signal = singal_clone.lock().unwrap();
+
+            for sample in data.iter_mut() {
+                *sample = if index < signal.len() {
+                    signal[index]
+                } else {
+                    0.0
+                };
+                index += 1;
+            }
         },
         |err| eprintln!("Error: {:?}", err),
         None
     )?;
 
     stream.play()?;
-    std::thread::sleep(std::time::Duration::from_secs(5));
+    std::thread::sleep(std::time::Duration::from_secs(1));
     Ok(())
 }

amps-handset-emu/src/fsk.rs

@@ -1,20 +1,43 @@
 use std::f32::consts::PI;
-use dasp_signal::Signal;
 
 const SAMPLE_RATE: f32 = 44100.0;
 const BAUD_RATE: f32 = 1200.0;
 const FREQ_MARK: f32 = 1200.0;
 const FREQ_SPACE: f32 = 2200.0;
 
-pub fn fsk_modulate(bits: &[u8]) -> Vec<f32> {
+pub fn fsk_modulate(data: &[u8]) -> Vec<f32> {
     let samples_per_bit = (SAMPLE_RATE / BAUD_RATE) as usize;
     let mut signal = Vec::new();
 
-    for &bit in bits {
-        let freq = if bit == 1 { FREQ_MARK } else { FREQ_SPACE };
-        for i in 0..samples_per_bit {
-            let t = i as f32 / SAMPLE_RATE;
-            signal.push((2.0 * PI * freq * t).sin());
+    for &byte in data {
+        for i in (0..8).rev() {
+            let bit = (byte >> i) & 1;
+            let freq = if bit == 1 { FREQ_MARK } else { FREQ_SPACE };
+
+            for j in 0..samples_per_bit {
+                let t = (signal.len() + j) as f32 / SAMPLE_RATE;
+                signal.push((2.0 * PI * freq * t).sin());
+            }
+        }
+    }
+    signal
+}
+
+pub fn afsk_modulate(data: &[u8], carrier_freq: f32) -> Vec<f32> {
+    let samples_per_bit = (SAMPLE_RATE / BAUD_RATE) as usize;
+    let mut signal = Vec::new();
+
+    for &byte in data {
+        for i in (0..8).rev() {
+            let bit = (byte >> i) & 1;
+            let freq = if bit == 1 { FREQ_MARK } else { FREQ_SPACE };
+
+            for j in 0..samples_per_bit {
+                let t = (signal.len() + j) as f32 / SAMPLE_RATE;
+                let fsk_wave = (2.0 * PI * freq * t).sin();
+                let carrier_wave = (2.0 * PI * carrier_freq * t).sin();
+                signal.push(fsk_wave * carrier_wave); // Modulate FSK onto the carrier
+            }
         }
     }
     signal

amps-handset-emu/src/main.rs

@@ -1,4 +1,5 @@
-use fsk::fsk_modulate;
+use audio::play_audio;
+use fsk::afsk_modulate;
 use text_io::scan;
 use std::io;
 
@@ -15,9 +16,14 @@ fn main() -> Result<(), io::Error> {
     match a {
         1 => {
             println!("1 has been pressed! No test tone implemented yet");
-            let tone: signal;
-            tone = fsk_modulate([0x25, 0x08, 0x00, 0x25, 0xA0]);
-            play_audio(tone);
+            let tone: Vec<f32>;
+            tone = afsk_modulate(&[
+                0b10101010, 0b01010101, 0b10101010, 0b01010101, 0b10101010, 0b01010101, 0b10101010, 0b01010101, 0b10101010, 0b01010101,
+                0b1000101,0b11111111,0b1000101,0b11111111,0b11111111,0b1000101,0b11111111,0b11111111,0b1000101,0b11111111,0b11111111, 
+                ], 1700.0);
+            let repeated_tone: Vec<f32> = tone.iter().cloned().cycle().take(tone.len() * 10).collect();
+            
+            play_audio(&repeated_tone);
             return main();
         },
         0 => {

cellular/src/amps.rs

@@ -0,0 +1,28 @@
+enum DSPMode {
+    OFF,  // Channel not active
+    AUDIO_RX_AUDIO_TX, // stream audio
+    AUDIO_RX_FRAME_TX, // stream audio and send frames
+    AUDIO_RX_SILENCE_TX, // stream audio and send silence
+    FRAME_RX_FRAME_TX, // send and receive frames
+}
+
+enum AMPSChannelType {
+    CC, // control channel
+    PC, // paging channel
+    CC_PC, // combined control+paging
+    VC, // voice channel
+    CC_PC_VC, // combined control+paging+voice
+}
+
+enum AMPSState {
+    NULL, // power off
+    IDLE, // channel not in use
+    BUSY, // channel busy (call in progress)
+}
+
+enum FSK_RX_Sync {
+    NONE, // not in sync, waiting for valid dotting sequence
+    DOTTING, // received a valid dotting sequence, check for sync sequence
+    POSITIVE, // valid sync, read all bits from the frame
+    NEGATIVE, // negative sync (high frequency deviation detected as low signal)
+}

cellular/src/iir_filter.rs

@@ -0,0 +1,36 @@
+struct IIRFilter {
+    iter: i32,
+    a0: f64,
+    a1: f64,
+    a2: f64,
+    b1: f64,
+    b2: f64,
+    z1: f64,
+    z2: f64,
+}
+
+impl IIRFilter {
+    pub fn lowpass_init(&mut self, frequency: f64, samplerate: i32, iterations: i32) {
+
+    }
+
+    pub fn highpass_init(&mut self, frequency: f64, samplerate: i32, iterations: i32) {
+
+    }
+
+    pub fn bandpass_init(&mut self, frequency: f64, samplerate: i32, iterations: i32) {
+
+    }
+
+    pub fn notch_init(&mut self, frequency: f64, samplerate: i32, iterations: i32, Q: f64) {
+
+    }
+
+    pub fn process(&mut self, samples: Sample, length: i32) {
+
+    }
+
+    pub fn process_baseband(&mut self, filter: IIRFilter, baseband: f64, length: i32) {
+
+    }
+}

cellular/src/libmobile_sender.rs

@@ -0,0 +1,45 @@
+enum PagingSignal {
+    NONE = 0,
+    TONE,
+    NOTONE,
+    POSITIVE,
+    NEGATIVE,
+}
+
+struct Sender {
+    // System Info
+    channel: char,
+    send_freq: f64,
+    recv_freq: f64,
+    
+    // FM/AM levels
+    am: i32,
+    max_deviation: f64,
+    max_modulation: f64,
+    speech_deviation: f64,
+    modulation_index: f64,
+    max_display: f64,
+
+    // Audio
+    audio: void,
+    device: char,
+    audio_open: void,
+    audio_start: i32,
+    audio_close: void,
+    audio_write: i32,
+    audio_get_tosend: i32,
+    samplerate: i32,
+    samplerate_state: SampleRate,
+    rx_gain: f64,
+    tx_gain: f64,
+    pre_emphasis: i32,
+    de_emphasis: i32,
+    epmphasis_state: EmphasisState,
+
+    // Loopback
+    loopback: i32,
+
+    // Record & Playback
+    
+
+}

cellular/src/main.rs

@@ -2,6 +2,10 @@ use ferris_says::say;
 use std::io::{stdout, BufWriter};
 
 mod sdr;
+mod amps;
+mod libmobile_sender;
+mod iir_filter;
+mod samplerate;
 
 fn main() -> Result<(), Box<dyn std::error::Error>> {
     let stdout = stdout();

cellular/src/samplerate.rs

@@ -0,0 +1,45 @@
+struct SampleRate {
+    factor: f64,
+    filter_cutoff: f64,
+    down: DownSampler,
+    up: UpSampler,
+}
+
+struct DownSampler {
+    lp: IIRFilter,
+    last_sample: Sample,
+    in_index: f64,
+}
+
+struct UpSampler {
+    lp: IIRFilter,
+    current_sample: Sample,
+    last_sample: Sample,
+    in_index: f64,
+}
+
+impl SampleRate {
+    pub fn init(&mut self, low_samplerate: f64, high_samplerate: f64, filter_cutoff: f64) -> Result<(), i32> {
+        // Implementation goes here
+
+        Ok(())
+        // or Err(error_code) if there's an error
+    }
+
+    pub fn downsample(&mut self, state: SampleRate, samples: Sample, input_num: i32) -> Result<(), i32> {
+        Ok(())
+    }
+
+    pub fn upsample_input_num(&mut self, state: SampleRate, output_num: i32) -> Result<(), i32> {
+        Ok(())
+    }
+
+    pub fn upsample_output_num(&mut self, state: SampleRate, input_num: i32) -> Result<(), i32> {
+        Ok(())
+    }
+
+    pub fn upsample(&mut self, state: SampleRate, input: Sample, input_num: i32, output: Sample, output_num: i32) {
+        
+    } 
+
+}

flake.lock

@@ -0,0 +1,82 @@
+{
+  "nodes": {
+    "flake-utils": {
+      "inputs": {
+        "systems": "systems"
+      },
+      "locked": {
+        "lastModified": 1731533236,
+        "narHash": "sha256-l0KFg5HjrsfsO/JpG+r7fRrqm12kzFHyUHqHCVpMMbI=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "11707dc2f618dd54ca8739b309ec4fc024de578b",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1742669843,
+        "narHash": "sha256-G5n+FOXLXcRx+3hCJ6Rt6ZQyF1zqQ0DL0sWAMn2Nk0w=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "1e5b653dff12029333a6546c11e108ede13052eb",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixos-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "flake-utils": "flake-utils",
+        "nixpkgs": "nixpkgs",
+        "rust-overlay": "rust-overlay"
+      }
+    },
+    "rust-overlay": {
+      "inputs": {
+        "nixpkgs": [
+          "nixpkgs"
+        ]
+      },
+      "locked": {
+        "lastModified": 1742870002,
+        "narHash": "sha256-eQnw8ufyLmrboODU8RKVNh2Mv7SACzdoFrRUV5zdNNE=",
+        "owner": "oxalica",
+        "repo": "rust-overlay",
+        "rev": "b4c18f262dbebecb855136c1ed8047b99a9c75b6",
+        "type": "github"
+      },
+      "original": {
+        "owner": "oxalica",
+        "repo": "rust-overlay",
+        "type": "github"
+      }
+    },
+    "systems": {
+      "locked": {
+        "lastModified": 1681028828,
+        "narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
+        "owner": "nix-systems",
+        "repo": "default",
+        "rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-systems",
+        "repo": "default",
+        "type": "github"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

flake.nix

@@ -0,0 +1,33 @@
+{
+    inputs = {
+        nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
+        flake-utils.url = "github:numtide/flake-utils";
+        rust-overlay = {
+            url = "github:oxalica/rust-overlay";
+            inputs = {
+                nixpkgs.follows = "nixpkgs";
+            };
+        };
+    };
+
+    outputs = { self, nixpkgs, flake-utils, rust-overlay }:
+    flake-utils.lib.eachDefaultSystem (system:
+        let
+            overlays = [ (import rust-overlay ) ];
+            pkgs = import nixpkgs {
+                inherit system overlays;
+            };
+        in
+        with pkgs;
+        {
+            devShells.default = mkShell {
+                buildInputs = [
+                    pkgs.bashInteractive
+                    rust-bin.stable.latest.default
+                    pkgs.pkg-config
+                    pkgs.alsa-lib 
+                ];
+            };
+        }
+    );
+}