arduino-tnc

git clone https://git.bradleygannon.com/arduino-tnc.git
Log | Files | Refs
commit f764ef0581c622626574581f551227744455c502
parent 3e10c5cd7da55cb8bc3542d973f8334a8262b562
Author: Bradley Gannon <bradley@bradleygannon.com>
Date:   Fri, 29 May 2026 18:39:04 -0400

Split Goertzel and demod functions into separate crate to allow host-side testing

Diffstat:

D.cargo/config.toml | 9---------


M.gitignore | 2+-


DCargo.lock | 1080-------------------------------------------------------------------------------


DCargo.toml | 39---------------------------------------


DRavedude.toml | 4----


Afirmware/.cargo/config.toml | 12++++++++++++


Afirmware/Cargo.lock | 1086+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++


Afirmware/Cargo.toml | 41+++++++++++++++++++++++++++++++++++++++++


Afirmware/Ravedude.toml | 4++++


Rrust-toolchain.toml -> firmware/rust-toolchain.toml | 0


Rsrc/kiss.rs -> firmware/src/kiss.rs | 0


Afirmware/src/main.rs | 182+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++


Afirmware/src/rx.rs | 44++++++++++++++++++++++++++++++++++++++++++++


Rsrc/tx.rs -> firmware/src/tx.rs | 0


Mflake.lock | 6+++---


Mflake.nix | 2+-


Dsrc/main.rs | 182-------------------------------------------------------------------------------


Dsrc/rx.rs | 126-------------------------------------------------------------------------------


Atnc-core/.cargo/config.toml | 5+++++


Atnc-core/Cargo.lock | 7+++++++


Atnc-core/Cargo.toml | 4++++


Atnc-core/src/goertzel.rs | 155+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++


Atnc-core/src/lib.rs | 7+++++++


Atnc-core/tests/demodulator_test.rs | 262+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++


Atnc-core/tests/goertzel_filter_test.rs | 78++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++


25 files changed, 1892 insertions(+), 1445 deletions(-)

diff --git a/.cargo/config.toml b/.cargo/config.toml
@@ -1,9 +0,0 @@
-[build]
-target = "avr-none"
-rustflags = ["-C", "target-cpu=atmega328p"]
-
-[target.'cfg(target_arch = "avr")']
-runner = "ravedude"
-
-[unstable]
-build-std = ["core"]
diff --git a/.gitignore b/.gitignore
@@ -1 +1 @@
-/target
+**/target
diff --git a/Cargo.lock b/Cargo.lock
@@ -1,1080 +0,0 @@
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diff --git a/firmware/Cargo.toml b/firmware/Cargo.toml
@@ -0,0 +1,41 @@
+[package]
+name = "arduino-tnc"
+version = "0.1.0"
+authors = ["Bradley Gannon <bradley@bradleygannon.com>"]
+edition = "2021"
+license = "MIT OR Apache-2.0"
+
+[[bin]]
+bench = false
+name = "arduino-tnc"
+test = false
+
+[dependencies]
+avr-device = "0.8.1"
+crc = "3.4.0"
+embedded-hal = "1.0"
+heapless = "0.9.2"
+nb = "1.1.0"
+panic-halt = "1.0.0"
+trig-const = "0.4.0"
+ufmt = "0.2.0"
+
+[dependencies.arduino-hal]
+git = "https://github.com/rahix/avr-hal"
+rev = "e5c8f37fe48419956e722490a82b9ca9b9fc61a2"
+features = ["arduino-nano"]
+
+[dependencies.tnc-core]
+path = "../tnc-core"
+
+[profile.dev]
+opt-level = "s"
+lto = true
+panic = "abort"
+
+[profile.release]
+opt-level = "s"
+debug = true
+lto = true
+panic = "abort"
+codegen-units = 1
diff --git a/firmware/Ravedude.toml b/firmware/Ravedude.toml
@@ -0,0 +1,4 @@
+[general]
+board = "nano"
+open-console = true
+serial-baudrate = 115200
diff --git a/rust-toolchain.toml b/firmware/rust-toolchain.toml
diff --git a/src/kiss.rs b/firmware/src/kiss.rs
diff --git a/firmware/src/main.rs b/firmware/src/main.rs
@@ -0,0 +1,182 @@
+#![no_std]
+#![no_main]
+#![feature(abi_avr_interrupt)]
+
+mod kiss;
+mod rx;
+mod tx;
+
+use core::cell::RefCell;
+use core::hint::spin_loop;
+
+use arduino_hal::clock::MHz16;
+use arduino_hal::hal::usart::{Event, Usart0};
+use arduino_hal::{pac, Adc};
+use avr_device::generic::Periph;
+use avr_device::interrupt::{self, Mutex};
+use kiss::{KissAction, KissTncState};
+use panic_halt as _;
+use rx::Receiver;
+use tx::Transmitter;
+
+type TC0 = Periph<pac::tc0::RegisterBlock, 53>;
+type TC1 = Periph<pac::tc1::RegisterBlock, 54>;
+
+struct Tnc {
+    state: TncState,
+    serial: Option<Usart0<MHz16>>,
+    receiver: Receiver,
+    transmitter: Transmitter,
+    kiss_state: KissTncState,
+    sample_timer: Option<TC0>,
+    symbol_timer: Option<TC1>,
+}
+
+impl Tnc {
+    // 52 * 8 = 416 cycles; at 16 MHz this gives a period of 26 µs (about 38460 Hz)
+    const SAMPLE_TIMER_COMPARE: u8 = 52;
+    // this should theoretically be 13_333 cycles, but in practice we have to go a little faster to
+    // account for overhead; this value seems to work well
+    const SYMBOL_TIMER_COMPARE: u16 = 13_300;
+
+    const fn default() -> Tnc {
+        Tnc {
+            state: TncState::Receiving,
+            serial: None,
+            receiver: Receiver::default(),
+            transmitter: Transmitter::default(),
+            kiss_state: KissTncState::Idle,
+            sample_timer: None,
+            symbol_timer: None,
+        }
+    }
+    pub(crate) fn handle_usart_byte(&mut self, byte: u8) {
+        if let Some(action) = self.kiss_state.update(byte) {
+            match action {
+                KissAction::PushTx(b) => {
+                    let _ = self.transmitter.push_message_byte(b);
+                }
+                KissAction::ClearTx => self.transmitter.clear_message(),
+                KissAction::SendTx => {
+                    if self.transmitter.has_pending_bytes() {
+                        self.state = TncState::Transmitting;
+                        self.transmitter.start();
+                    }
+                }
+                KissAction::_SetTxDelay { .. } => todo!(),
+                KissAction::_SetPersistence { .. } => todo!(),
+                KissAction::_SetSlotTime { .. } => todo!(),
+                KissAction::_SetTxTail { .. } => todo!(),
+                KissAction::_SetFullDuplex { .. } => todo!(),
+                KissAction::_SetHardware { .. } => todo!(),
+                KissAction::_Return => todo!(),
+            }
+        };
+    }
+}
+
+enum TncState {
+    Receiving,
+    Transmitting,
+}
+
+static TNC: Mutex<RefCell<Tnc>> = Mutex::new(RefCell::new(Tnc::default()));
+
+#[avr_device::interrupt(atmega328p)]
+fn TIMER0_COMPA() {
+    interrupt::free(|cs| {
+        let mut tnc = TNC.borrow(cs).borrow_mut();
+        match tnc.state {
+            TncState::Receiving => {
+                tnc.receiver.sample_update();
+                if tnc.receiver.is_at_symbol_transition() {
+                    if let Some(ref mut symbol_timer) = tnc.symbol_timer {
+                        symbol_timer
+                            .tcnt1()
+                            .write(|w| w.set(Tnc::SYMBOL_TIMER_COMPARE / 2));
+                    }
+                }
+                if let Some(byte) = tnc.receiver.get_output() {
+                    if let Some(ref mut serial) = tnc.serial {
+                        let _ = ufmt::uwriteln!(serial, "0x{:02x}", byte);
+                    }
+                }
+            }
+            TncState::Transmitting => {
+                tnc.transmitter.sample_update();
+                if tnc.transmitter.is_done() {
+                    tnc.state = TncState::Receiving;
+                }
+            }
+        }
+    });
+}
+
+#[avr_device::interrupt(atmega328p)]
+fn TIMER1_COMPA() {
+    interrupt::free(|cs| {
+        let mut tnc = TNC.borrow(cs).borrow_mut();
+        match tnc.state {
+            TncState::Receiving => tnc.receiver.symbol_update(),
+            TncState::Transmitting => tnc.transmitter.symbol_update(),
+        }
+    });
+}
+
+#[avr_device::interrupt(atmega328p)]
+fn USART_RX() {
+    interrupt::free(|cs| {
+        let mut tnc = TNC.borrow(cs).borrow_mut();
+        if let Some(ref mut serial) = tnc.serial {
+            let byte = serial.read_byte();
+            tnc.handle_usart_byte(byte);
+        }
+    });
+}
+
+#[arduino_hal::entry]
+fn main() -> ! {
+    let dp = arduino_hal::Peripherals::take().unwrap();
+    let pins = arduino_hal::pins!(dp);
+
+    let mut serial = arduino_hal::default_serial!(dp, pins, 115200);
+    serial.listen(Event::RxComplete);
+
+    let sample_timer = dp.TC0;
+    sample_timer.tccr0a().write(|w| w.wgm0().ctc());
+    sample_timer.tccr0b().write(|w| w.cs0().prescale_8());
+    sample_timer
+        .ocr0a()
+        .write(|w| w.set(Tnc::SAMPLE_TIMER_COMPARE));
+    sample_timer.timsk0().write(|w| w.ocie0a().set_bit());
+
+    let symbol_timer = dp.TC1;
+    symbol_timer
+        .tccr1b()
+        .write(|w| w.wgm1().set(0b01).cs1().direct());
+    symbol_timer
+        .ocr1a()
+        .write(|w| w.set(Tnc::SYMBOL_TIMER_COMPARE));
+    symbol_timer.timsk1().write(|w| w.ocie1a().set_bit());
+
+    interrupt::free(|cs| {
+        let mut tnc = TNC.borrow(cs).borrow_mut();
+        tnc.sample_timer = Some(sample_timer);
+        tnc.symbol_timer = Some(symbol_timer);
+        tnc.receiver
+            .initialize(Adc::new(dp.ADC, Default::default()), pins.a0);
+        tnc.transmitter.initialize(
+            pins.d2.into_output(),
+            pins.d3.into_output(),
+            pins.d4.into_output(),
+            pins.d5.into_output(),
+            pins.d6.into_output(),
+        );
+    });
+
+    unsafe { avr_device::interrupt::enable() };
+
+    loop {
+        spin_loop();
+    }
+}
diff --git a/firmware/src/rx.rs b/firmware/src/rx.rs
@@ -0,0 +1,44 @@
+use arduino_hal::{
+    hal::port::PC0,
+    port::{
+        mode::{Analog, Floating, Input},
+        Pin,
+    },
+    Adc,
+};
+use tnc_core::goertzel::Bell202Demodulator;
+
+pub(crate) struct Receiver {
+    adc: Option<Adc>,
+    input: Option<Pin<Analog, PC0>>,
+    demod: Bell202Demodulator,
+}
+
+impl Receiver {
+    pub(crate) const fn default() -> Receiver {
+        Receiver {
+            adc: None,
+            input: None,
+            demod: Bell202Demodulator::new(),
+        }
+    }
+    pub(crate) fn initialize(&mut self, mut adc: Adc, input: Pin<Input<Floating>, PC0>) {
+        self.input = Some(input.into_analog_input(&mut adc));
+        self.adc = Some(adc);
+    }
+    pub(crate) fn is_at_symbol_transition(&self) -> bool {
+        self.demod.get_output().is_some()
+    }
+    pub(crate) fn get_output(&self) -> Option<u8> {
+        self.demod.get_output()
+    }
+    pub(crate) fn sample_update(&mut self) {
+        if let (Some(ref input), Some(ref mut adc)) = (&self.input, &mut self.adc) {
+            let new_sample = input.analog_read(adc) as f32 / 512. - 0.5;
+            self.demod.sample_update(new_sample);
+        }
+    }
+    pub(crate) fn symbol_update(&mut self) {
+        self.demod.symbol_update();
+    }
+}
diff --git a/src/tx.rs b/firmware/src/tx.rs
diff --git a/flake.lock b/flake.lock
@@ -46,11 +46,11 @@
     },
     "stablePkgs": {
       "locked": {
-        "lastModified": 1779467186,
-        "narHash": "sha256-nOesoDCiXcUftqbRBMz9tt4blI5PvljMWbm3kuCA+0s=",
+        "lastModified": 1779796641,
+        "narHash": "sha256-ZsIrKmhp4vbBXoXXmR/tBXA/UCsAQiJL9vsgZEduhVY=",
         "owner": "nixos",
         "repo": "nixpkgs",
-        "rev": "b77b3de8775677f84492abe84635f87b0e153f0f",
+        "rev": "25f538306313eae3927264466c70d7001dcea1df",
         "type": "github"
       },
       "original": {
diff --git a/flake.nix b/flake.nix
@@ -26,7 +26,7 @@
         inherit system;
       };
       rust = fenix.fromToolchainFile {
-        file = ./rust-toolchain.toml;
+        file = ./firmware/rust-toolchain.toml;
         sha256 = "sha256-DnyK5MS+xYySA+csnnMogu2gtEfyiy10W0ATmAvmjGg=";
       };
       libInputs = [ stable.stdenv.cc.cc.lib ];
diff --git a/src/main.rs b/src/main.rs
@@ -1,182 +0,0 @@
-#![no_std]
-#![no_main]
-#![feature(abi_avr_interrupt)]
-
-mod kiss;
-mod rx;
-mod tx;
-
-use core::cell::RefCell;
-use core::hint::spin_loop;
-
-use arduino_hal::clock::MHz16;
-use arduino_hal::hal::usart::{Event, Usart0};
-use arduino_hal::{pac, Adc};
-use avr_device::generic::Periph;
-use avr_device::interrupt::{self, Mutex};
-use kiss::{KissAction, KissTncState};
-use panic_halt as _;
-use rx::Receiver;
-use tx::Transmitter;
-
-type TC0 = Periph<pac::tc0::RegisterBlock, 53>;
-type TC1 = Periph<pac::tc1::RegisterBlock, 54>;
-
-struct Tnc {
-    state: TncState,
-    serial: Option<Usart0<MHz16>>,
-    receiver: Receiver,
-    transmitter: Transmitter,
-    kiss_state: KissTncState,
-    sample_timer: Option<TC0>,
-    symbol_timer: Option<TC1>,
-}
-
-impl Tnc {
-    // 52 * 8 = 416 cycles; at 16 MHz this gives a period of 26 µs (about 38460 Hz)
-    const SAMPLE_TIMER_COMPARE: u8 = 52;
-    // this should theoretically be 13_333 cycles, but in practice we have to go a little faster to
-    // account for overhead; this value seems to work well
-    const SYMBOL_TIMER_COMPARE: u16 = 13_300;
-
-    const fn default() -> Tnc {
-        Tnc {
-            state: TncState::Receiving,
-            serial: None,
-            receiver: Receiver::default(),
-            transmitter: Transmitter::default(),
-            kiss_state: KissTncState::Idle,
-            sample_timer: None,
-            symbol_timer: None,
-        }
-    }
-    pub(crate) fn handle_usart_byte(&mut self, byte: u8) {
-        if let Some(action) = self.kiss_state.update(byte) {
-            match action {
-                KissAction::PushTx(b) => {
-                    let _ = self.transmitter.push_message_byte(b);
-                }
-                KissAction::ClearTx => self.transmitter.clear_message(),
-                KissAction::SendTx => {
-                    if self.transmitter.has_pending_bytes() {
-                        self.state = TncState::Transmitting;
-                        self.transmitter.start();
-                    }
-                }
-                KissAction::_SetTxDelay { .. } => todo!(),
-                KissAction::_SetPersistence { .. } => todo!(),
-                KissAction::_SetSlotTime { .. } => todo!(),
-                KissAction::_SetTxTail { .. } => todo!(),
-                KissAction::_SetFullDuplex { .. } => todo!(),
-                KissAction::_SetHardware { .. } => todo!(),
-                KissAction::_Return => todo!(),
-            }
-        };
-    }
-}
-
-enum TncState {
-    Receiving,
-    Transmitting,
-}
-
-static TNC: Mutex<RefCell<Tnc>> = Mutex::new(RefCell::new(Tnc::default()));
-
-#[avr_device::interrupt(atmega328p)]
-fn TIMER0_COMPA() {
-    interrupt::free(|cs| {
-        let mut tnc = TNC.borrow(cs).borrow_mut();
-        match tnc.state {
-            TncState::Receiving => {
-                tnc.receiver.sample_update();
-                if tnc.receiver.is_at_symbol_transition() {
-                    if let Some(ref mut symbol_timer) = tnc.symbol_timer {
-                        symbol_timer
-                            .tcnt1()
-                            .write(|w| w.set(Tnc::SYMBOL_TIMER_COMPARE / 2));
-                    }
-                }
-                if let Some(byte) = tnc.receiver.get_output() {
-                    if let Some(ref mut serial) = tnc.serial {
-                        let _ = ufmt::uwriteln!(serial, "0x{:02x}", byte);
-                    }
-                }
-            }
-            TncState::Transmitting => {
-                tnc.transmitter.sample_update();
-                if tnc.transmitter.is_done() {
-                    tnc.state = TncState::Receiving;
-                }
-            }
-        }
-    });
-}
-
-#[avr_device::interrupt(atmega328p)]
-fn TIMER1_COMPA() {
-    interrupt::free(|cs| {
-        let mut tnc = TNC.borrow(cs).borrow_mut();
-        match tnc.state {
-            TncState::Receiving => tnc.receiver.symbol_update(),
-            TncState::Transmitting => tnc.transmitter.symbol_update(),
-        }
-    });
-}
-
-#[avr_device::interrupt(atmega328p)]
-fn USART_RX() {
-    interrupt::free(|cs| {
-        let mut tnc = TNC.borrow(cs).borrow_mut();
-        if let Some(ref mut serial) = tnc.serial {
-            let byte = serial.read_byte();
-            tnc.handle_usart_byte(byte);
-        }
-    });
-}
-
-#[arduino_hal::entry]
-fn main() -> ! {
-    let dp = arduino_hal::Peripherals::take().unwrap();
-    let pins = arduino_hal::pins!(dp);
-
-    let mut serial = arduino_hal::default_serial!(dp, pins, 57600);
-    serial.listen(Event::RxComplete);
-
-    let sample_timer = dp.TC0;
-    sample_timer.tccr0a().write(|w| w.wgm0().ctc());
-    sample_timer.tccr0b().write(|w| w.cs0().prescale_8());
-    sample_timer
-        .ocr0a()
-        .write(|w| w.set(Tnc::SAMPLE_TIMER_COMPARE));
-    sample_timer.timsk0().write(|w| w.ocie0a().set_bit());
-
-    let symbol_timer = dp.TC1;
-    symbol_timer
-        .tccr1b()
-        .write(|w| w.wgm1().set(0b01).cs1().direct());
-    symbol_timer
-        .ocr1a()
-        .write(|w| w.set(Tnc::SYMBOL_TIMER_COMPARE));
-    symbol_timer.timsk1().write(|w| w.ocie1a().set_bit());
-
-    interrupt::free(|cs| {
-        let mut tnc = TNC.borrow(cs).borrow_mut();
-        tnc.sample_timer = Some(sample_timer);
-        tnc.symbol_timer = Some(symbol_timer);
-        tnc.receiver
-            .initialize(Adc::new(dp.ADC, Default::default()), pins.a0);
-        tnc.transmitter.initialize(
-            pins.d2.into_output(),
-            pins.d3.into_output(),
-            pins.d4.into_output(),
-            pins.d5.into_output(),
-            pins.d6.into_output(),
-        );
-    });
-
-    unsafe { avr_device::interrupt::enable() };
-
-    loop {
-        spin_loop();
-    }
-}
diff --git a/src/rx.rs b/src/rx.rs
@@ -1,126 +0,0 @@
-use core::f32::consts::TAU;
-
-use arduino_hal::{
-    hal::port::PC0,
-    port::{
-        mode::{Analog, Floating, Input},
-        Pin,
-    },
-    Adc,
-};
-use trig_const::cos;
-
-#[derive(PartialEq, Clone, Copy)]
-enum Symbol {
-    Mark,
-    Space,
-}
-
-struct GoertzelFilter {
-    coeff: f32,
-    s0: f32,
-    s1: f32,
-    s2: f32,
-    energy: f32,
-}
-
-impl GoertzelFilter {
-    const fn new(frequency: f32, sample_rate: f32) -> Self {
-        GoertzelFilter {
-            coeff: 2. * cos((TAU * frequency / sample_rate) as f64) as f32,
-            s0: 0.,
-            s1: 0.,
-            s2: 0.,
-            energy: 0.,
-        }
-    }
-    fn update(&mut self, x: f32) {
-        self.s0 = x + self.coeff * self.s1 - self.s2;
-        self.s2 = self.s1;
-        self.s1 = self.s0;
-        self.energy = self.s1 * self.s1 + self.s2 * self.s2 - self.coeff * self.s1 * self.s2;
-    }
-    fn energy(&self) -> f32 {
-        self.energy
-    }
-}
-
-pub(crate) struct Receiver {
-    adc: Option<Adc>,
-    input: Option<Pin<Analog, PC0>>,
-    mark: GoertzelFilter,
-    space: GoertzelFilter,
-    symbol_estimate: Symbol,
-    previous_symbol_estimate: Symbol,
-    symbol_phase: u8,
-    byte: u8,
-    byte_phase: u8,
-    output: Option<u8>,
-}
-
-impl Receiver {
-    const MARK_HZ: f32 = 1200.;
-    const SPACE_HZ: f32 = 2200.;
-    const SAMPLE_RATE_HZ: f32 = 38400.;
-    const SYMBOL_RATE_HZ: f32 = 1200.;
-    const SAMPLES_PER_SYMBOL: u8 = (Self::SAMPLE_RATE_HZ / Self::SYMBOL_RATE_HZ) as u8;
-
-    pub(crate) const fn default() -> Receiver {
-        Receiver {
-            adc: None,
-            input: None,
-            mark: GoertzelFilter::new(Receiver::MARK_HZ, Receiver::SAMPLE_RATE_HZ),
-            space: GoertzelFilter::new(Receiver::SPACE_HZ, Receiver::SAMPLE_RATE_HZ),
-            symbol_estimate: Symbol::Space,
-            previous_symbol_estimate: Symbol::Space,
-            symbol_phase: 0,
-            byte: 0,
-            byte_phase: 0,
-            output: None,
-        }
-    }
-    pub(crate) fn initialize(&mut self, mut adc: Adc, input: Pin<Input<Floating>, PC0>) {
-        self.input = Some(input.into_analog_input(&mut adc));
-        self.adc = Some(adc);
-    }
-    pub(crate) fn is_at_symbol_transition(&self) -> bool {
-        self.symbol_phase == 0
-    }
-    pub(crate) fn get_output(&self) -> Option<u8> {
-        self.output
-    }
-    pub(crate) fn sample_update(&mut self) {
-        if let (Some(ref input), Some(ref mut adc)) = (&self.input, &mut self.adc) {
-            let new_sample = input.analog_read(adc) as f32 / 512. - 0.5;
-            self.mark.update(new_sample);
-            self.space.update(new_sample);
-            let new_symbol_estimate = if self.mark.energy() > self.space.energy() {
-                Symbol::Mark
-            } else {
-                Symbol::Space
-            };
-            if new_symbol_estimate != self.symbol_estimate {
-                self.symbol_phase = 0;
-            } else {
-                self.symbol_phase = self.symbol_phase.saturating_add(1) % Self::SAMPLES_PER_SYMBOL;
-            }
-            self.symbol_estimate = new_symbol_estimate;
-        }
-    }
-    pub(crate) fn symbol_update(&mut self) {
-        self.byte <<= 1;
-        if self.symbol_estimate == self.previous_symbol_estimate {
-            self.byte += 1;
-        }
-        self.byte_phase = (self.byte_phase + 1) % 8;
-        if self.byte == 0x7e {
-            self.byte_phase = 0;
-        }
-        if self.byte_phase == 0 {
-            self.output = Some(self.byte);
-        } else {
-            self.output = None;
-        }
-        self.previous_symbol_estimate = self.symbol_estimate;
-    }
-}
diff --git a/tnc-core/.cargo/config.toml b/tnc-core/.cargo/config.toml
@@ -0,0 +1,5 @@
+# Override the workspace root's AVR target + build-std for this package.
+# x86_64 has a pre-built core, so build-std from the parent is effectively
+# a no-op for this crate.
+[build]
+target = "x86_64-unknown-linux-gnu"
diff --git a/tnc-core/Cargo.lock b/tnc-core/Cargo.lock
@@ -0,0 +1,7 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 4
+
+[[package]]
+name = "tnc-core"
+version = "0.1.0"
diff --git a/tnc-core/Cargo.toml b/tnc-core/Cargo.toml
@@ -0,0 +1,4 @@
+[package]
+name = "tnc-core"
+version = "0.1.0"
+edition = "2021"
diff --git a/tnc-core/src/goertzel.rs b/tnc-core/src/goertzel.rs
@@ -0,0 +1,155 @@
+//! Block-based Goertzel demodulation for Bell 202 AFSK (mark @ 1200 Hz, space @ 2200 Hz).
+
+/// A single Goertzel resonator.
+#[derive(Clone, Copy, Debug)]
+pub struct GoertzelFilter {
+    /// 2cos(2πf / sample_rate)
+    pub coeff: f32,
+    pub s0: f32,
+    pub s1: f32,
+    pub s2: f32,
+    pub energy: f32,
+}
+
+impl GoertzelFilter {
+    /// Create a new Goertzel filter with a pre-computed coefficient.
+    ///
+    /// The coefficient should be `2cos(2πf / sample_rate)`. We can't easily compute the
+    /// coefficient inside this method because it's `const`.
+    pub const fn new_with_coeff(coeff: f32) -> Self {
+        Self {
+            coeff,
+            s0: 0.0,
+            s1: 0.0,
+            s2: 0.0,
+            energy: 0.0,
+        }
+    }
+
+    pub const fn mark() -> Self {
+        Self::new_with_coeff(1.961_69)
+    }
+
+    pub const fn space() -> Self {
+        Self::new_with_coeff(1.872_207_2)
+    }
+
+    /// Feed one sample through the resonator.
+    ///
+    /// After calling `update`, the `energy` field contains the squared energy of the current
+    /// block. For block-based usage, reset `s0`, `s1`, `s2` to 0.0 at each symbol boundary.
+    pub fn update(&mut self, x: f32) {
+        self.s0 = x + self.coeff * self.s1 - self.s2;
+        self.s2 = self.s1;
+        self.s1 = self.s0;
+        self.energy = self.s1 * self.s1 + self.s2 * self.s2 - self.coeff * self.s1 * self.s2;
+    }
+
+    pub fn energy(&self) -> f32 {
+        self.energy
+    }
+
+    pub fn reset(&mut self) {
+        self.s0 = 0.0;
+        self.s1 = 0.0;
+        self.s2 = 0.0;
+        self.energy = 0.0;
+    }
+}
+
+/// A Bell 202 demodulator that produces byte-aligned output using NRZI decoding and HDLC flag
+/// detection.
+pub struct Bell202Demodulator {
+    mark: GoertzelFilter,
+    space: GoertzelFilter,
+    symbol_estimate: Symbol,
+    previous_symbol_estimate: Symbol,
+    symbol_phase: u8,
+    byte: u8,
+    byte_phase: u8,
+    output: Option<u8>,
+}
+
+/// A decoded symbol: mark (1200 Hz) or space (2200 Hz).
+#[derive(PartialEq, Clone, Copy, Debug)]
+pub enum Symbol {
+    Mark,
+    Space,
+}
+
+impl Bell202Demodulator {
+    pub const SAMPLE_RATE_HZ: f32 = 38460.;
+    pub const MARK_HZ: f32 = 1200.;
+    pub const SPACE_HZ: f32 = 2200.;
+    pub const SYMBOL_RATE_HZ: f32 = 1200.;
+    pub const SAMPLES_PER_SYMBOL: u8 = (Self::SAMPLE_RATE_HZ / Self::SYMBOL_RATE_HZ) as u8;
+
+    pub const fn new() -> Self {
+        Self {
+            mark: GoertzelFilter::mark(),
+            space: GoertzelFilter::space(),
+            symbol_estimate: Symbol::Space,
+            previous_symbol_estimate: Symbol::Space,
+            symbol_phase: 0,
+            byte: 0,
+            byte_phase: 0,
+            output: None,
+        }
+    }
+
+    /// Feed one sample into the Goertzel resonators.
+    ///
+    /// This should be called at the configured sample rate.
+    pub fn sample_update(&mut self, sample: f32) {
+        self.mark.update(sample);
+        self.space.update(sample);
+        let new_symbol_estimate = if self.mark.energy() > self.space.energy() {
+            Symbol::Mark
+        } else {
+            Symbol::Space
+        };
+        if new_symbol_estimate != self.symbol_estimate {
+            self.symbol_phase = 0;
+        } else {
+            self.symbol_phase = self.symbol_phase.saturating_add(1) % Self::SAMPLES_PER_SYMBOL;
+        }
+        self.symbol_estimate = new_symbol_estimate;
+    }
+
+    /// Called once per symbol period. Produces NRZI-decoded, byte-aligned output.
+    ///
+    /// The demodulator outputs a byte whenever `0x7e` (HDLC flag) is detected in the NRZI stream.
+    /// Returns the output byte, or `None` if no flag was found.
+    pub fn symbol_update(&mut self) -> Option<u8> {
+        self.byte <<= 1;
+        if self.symbol_estimate == self.previous_symbol_estimate {
+            self.byte += 1;
+        }
+        self.byte_phase = (self.byte_phase + 1) % 8;
+        if self.byte == 0x7e {
+            self.byte_phase = 0;
+        }
+        if self.byte_phase == 0 {
+            self.output = Some(self.byte);
+        } else {
+            self.output = None;
+        }
+        self.previous_symbol_estimate = self.symbol_estimate;
+        self.output
+    }
+
+    pub fn reset(&mut self) {
+        self.mark.reset();
+        self.space.reset();
+        self.symbol_estimate = Symbol::Space;
+        self.previous_symbol_estimate = Symbol::Space;
+        self.symbol_phase = 0;
+        self.byte = 0;
+        self.byte_phase = 0;
+        self.output = None;
+    }
+
+    pub fn get_output(&self) -> Option<u8> {
+        self.output
+    }
+}
diff --git a/tnc-core/src/lib.rs b/tnc-core/src/lib.rs
@@ -0,0 +1,7 @@
+//! Shared, hardware-agnostic algorithms for the Arduino TNC.
+//!
+//! To run tests: `cargo test` (from workspace root or from tnc-core/)
+
+#![no_std]
+
+pub mod goertzel;
diff --git a/tnc-core/tests/demodulator_test.rs b/tnc-core/tests/demodulator_test.rs
@@ -0,0 +1,262 @@
+use std::f64::consts::TAU;
+
+use tnc_core::goertzel::{Bell202Demodulator, GoertzelFilter, Symbol};
+
+const SAMPLE_RATE: f32 = 38460.;
+
+fn generate_audio_phase_continuous(
+    symbols: &[Symbol],
+    sample_rate: f32,
+    mark_hz: f32,
+    space_hz: f32,
+) -> Vec<f32> {
+    let samples_per_symbol = (sample_rate / 1200.) as usize;
+    let mut audio = Vec::with_capacity(symbols.len() * samples_per_symbol);
+
+    let mut phase = 0_f64;
+    let dt = 1. / sample_rate as f64;
+
+    for sym in symbols {
+        let freq = match sym {
+            Symbol::Mark => mark_hz as f64,
+            Symbol::Space => space_hz as f64,
+        };
+        let phase_inc = freq * dt * TAU;
+
+        for _ in 0..samples_per_symbol {
+            audio.push(phase.sin() as f32);
+            phase += phase_inc;
+        }
+    }
+
+    audio
+}
+
+struct Rng(u64);
+
+impl Rng {
+    fn new(seed: u64) -> Self {
+        Self(seed)
+    }
+    fn next(&mut self) -> u64 {
+        self.0 = self
+            .0
+            .wrapping_mul(6364136223846793005)
+            .wrapping_add(1442695040888963407);
+        self.0
+    }
+    fn uniform(&mut self) -> f32 {
+        self.next() as f32 / u64::MAX as f32
+    }
+}
+
+fn generate_symbols(n: usize, seed: u64) -> Vec<Symbol> {
+    let mut rng = Rng::new(seed);
+    (0..n)
+        .map(|_| {
+            if rng.next() % 2 == 0 {
+                Symbol::Mark
+            } else {
+                Symbol::Space
+            }
+        })
+        .collect()
+}
+
+fn add_noise(samples: &[f32], noise_std: f32, seed: u64) -> Vec<f32> {
+    let mut rng = Rng::new(seed);
+    samples
+        .iter()
+        .map(|&s| {
+            if noise_std <= 0.0 {
+                return s;
+            }
+            let normal: f32 = (0..12).map(|_| rng.uniform() - 0.5).sum::<f32>() / (3_f32).sqrt();
+            s + normal * noise_std
+        })
+        .collect()
+}
+
+#[test]
+fn mark_only_tone_yields_mark_decisions() {
+    let mut demod = Bell202Demodulator::new();
+    let sps = Bell202Demodulator::SAMPLES_PER_SYMBOL as usize;
+    let total_samples = 64 * sps;
+    let dt = 1. / SAMPLE_RATE as f64;
+    let mut phase = 0_f64;
+    let phase_inc = 1200. * dt * TAU;
+
+    for i in 0..total_samples {
+        let sample = phase.sin() as f32;
+        demod.sample_update(sample);
+        if i > 0 && i % sps == 0 {
+            demod.symbol_update();
+        }
+        phase += phase_inc;
+    }
+}
+
+#[test]
+fn space_only_tone_yields_space_decisions() {
+    let mut demod = Bell202Demodulator::new();
+    let sps = Bell202Demodulator::SAMPLES_PER_SYMBOL as usize;
+    let total_samples = 64 * sps;
+    let dt = 1. / SAMPLE_RATE as f64;
+    let mut phase = 0_f64;
+    let phase_inc = 2200. * dt * TAU;
+
+    for i in 0..total_samples {
+        let sample = phase.sin() as f32;
+        demod.sample_update(sample);
+        if i > 0 && i % sps == 0 {
+            demod.symbol_update();
+        }
+        phase += phase_inc;
+    }
+}
+
+#[test]
+fn alternating_symbols_no_noise() {
+    let mut symbols = Vec::with_capacity(64);
+    for i in 0..64 {
+        symbols.push(if i % 2 == 0 {
+            Symbol::Mark
+        } else {
+            Symbol::Space
+        });
+    }
+    let audio = generate_audio_phase_continuous(&symbols, SAMPLE_RATE, 1200., 2200.);
+    let sps = Bell202Demodulator::SAMPLES_PER_SYMBOL as usize;
+
+    let mut mark = GoertzelFilter::mark();
+    let mut space = GoertzelFilter::space();
+    let mut correct = 0usize;
+    let mut total = 0usize;
+
+    for (i, &sample) in audio.iter().enumerate() {
+        mark.update(sample);
+        space.update(sample);
+        if i > 0 && i % sps == 0 {
+            total += 1;
+            let expected_mark = symbols[i / sps - 1] == Symbol::Mark;
+            if (mark.energy() > space.energy()) == expected_mark {
+                correct += 1;
+            }
+            mark.reset();
+            space.reset();
+        }
+    }
+
+    let accuracy = correct as f64 / total as f64;
+    assert!(
+        accuracy >= 0.95,
+        "Symbol accuracy should be >= 95% for clean alternating symbols, got {:.1}%",
+        accuracy * 100.0
+    );
+}
+
+#[test]
+fn random_symbols_no_noise() {
+    let symbols = generate_symbols(200, 42);
+    let audio = generate_audio_phase_continuous(&symbols, SAMPLE_RATE, 1200.0, 2200.0);
+    let sps = Bell202Demodulator::SAMPLES_PER_SYMBOL as usize;
+
+    let mut mark = GoertzelFilter::mark();
+    let mut space = GoertzelFilter::space();
+    let mut correct = 0usize;
+    let mut total = 0usize;
+
+    for (i, &sample) in audio.iter().enumerate() {
+        mark.update(sample);
+        space.update(sample);
+        if i > 0 && i % sps == 0 {
+            total += 1;
+            let expected_mark = symbols[i / sps - 1] == Symbol::Mark;
+            if (mark.energy() > space.energy()) == expected_mark {
+                correct += 1;
+            }
+            mark.reset();
+            space.reset();
+        }
+    }
+
+    let accuracy = correct as f64 / total as f64;
+    assert!(
+        accuracy >= 0.99,
+        "Symbol accuracy should be >= 99% for clean random symbols, got {:.1}% ({} / {})",
+        accuracy * 100.0,
+        correct,
+        total
+    );
+}
+
+#[test]
+fn moderate_noise_accuracy() {
+    let noise_std = 0.5 * 10.0f32.powf(-15.0 / 20.0);
+    let symbols = generate_symbols(200, 42);
+    let audio = generate_audio_phase_continuous(&symbols, SAMPLE_RATE, 1200., 2200.);
+    let noisy = add_noise(&audio, noise_std, 12345);
+    let sps = Bell202Demodulator::SAMPLES_PER_SYMBOL as usize;
+
+    let mut mark = GoertzelFilter::mark();
+    let mut space = GoertzelFilter::space();
+    let mut correct = 0usize;
+    let mut total = 0usize;
+
+    for (i, &sample) in noisy.iter().enumerate() {
+        mark.update(sample);
+        space.update(sample);
+        if i > 0 && i % sps == 0 {
+            total += 1;
+            let expected_mark = symbols[i / sps - 1] == Symbol::Mark;
+            if (mark.energy() > space.energy()) == expected_mark {
+                correct += 1;
+            }
+            mark.reset();
+            space.reset();
+        }
+    }
+
+    let accuracy = correct as f64 / total as f64;
+    assert!(
+        accuracy >= 0.90,
+        "Symbol accuracy at ~15 dB SNR should be >= 90%, got {:.1}% ({} / {})",
+        accuracy * 100.0,
+        correct,
+        total
+    );
+}
+
+#[test]
+fn frequency_offset_tolerance() {
+    let space_hz = 3200_f32;
+    let symbols = generate_symbols(100, 42);
+    let audio = generate_audio_phase_continuous(&symbols, SAMPLE_RATE, 1200.0, space_hz);
+    let sps = Bell202Demodulator::SAMPLES_PER_SYMBOL as usize;
+
+    let mut mark = GoertzelFilter::mark();
+    let mut space = GoertzelFilter::space();
+    let mut correct = 0usize;
+    let mut total = 0usize;
+
+    for (i, &sample) in audio.iter().enumerate() {
+        mark.update(sample);
+        space.update(sample);
+        if i > 0 && i % sps == 0 {
+            total += 1;
+            let expected_mark = symbols[i / sps - 1] == Symbol::Mark;
+            if (mark.energy() > space.energy()) == expected_mark {
+                correct += 1;
+            }
+            mark.reset();
+            space.reset();
+        }
+    }
+
+    let accuracy = correct as f64 / total as f64;
+    assert!(
+        accuracy >= 0.95,
+        "Symbol accuracy with +1000 Hz space offset should be >= 95%, got {:.1}%",
+        accuracy * 100.0
+    );
+}
diff --git a/tnc-core/tests/goertzel_filter_test.rs b/tnc-core/tests/goertzel_filter_test.rs
@@ -0,0 +1,78 @@
+use tnc_core::goertzel::GoertzelFilter;
+
+const SAMPLE_RATE: f32 = 38460.;
+
+fn generate_tone(frequency: f32, duration_samples: usize, sample_rate: f32) -> Vec<f32> {
+    let mut samples = Vec::new();
+    let dt = 1. / sample_rate;
+    for i in 0..duration_samples {
+        let phase = 2.0 * std::f32::consts::PI * frequency * dt * i as f32;
+        samples.push(phase.sin());
+    }
+    samples
+}
+
+#[test]
+fn mark_tone_gives_higher_mark_energy() {
+    let mut mark = GoertzelFilter::mark();
+    let mut space = GoertzelFilter::space();
+
+    let samples = generate_tone(1200.0, 32, SAMPLE_RATE);
+
+    for &sample in &samples {
+        mark.update(sample);
+        space.update(sample);
+    }
+
+    assert!(
+        mark.energy() > space.energy(),
+        "Mark resonator should have higher energy than space resonator for 1200 Hz tone. \
+         mark_energy={}, space_energy={}",
+        mark.energy(),
+        space.energy()
+    );
+}
+
+#[test]
+fn space_tone_gives_higher_space_energy() {
+    let mut mark = GoertzelFilter::mark();
+    let mut space = GoertzelFilter::space();
+
+    let samples = generate_tone(2200.0, 32, SAMPLE_RATE);
+
+    for &sample in &samples {
+        mark.update(sample);
+        space.update(sample);
+    }
+
+    assert!(
+        space.energy() > mark.energy(),
+        "Space resonator should have higher energy than mark resonator for 2200 Hz tone. \
+         mark_energy={}, space_energy={}",
+        mark.energy(),
+        space.energy()
+    );
+}
+
+#[test]
+fn filter_reset_clears_states() {
+    let mut filter = GoertzelFilter::mark();
+
+    let samples = generate_tone(1200.0, 32, SAMPLE_RATE);
+    for &sample in &samples {
+        filter.update(sample);
+    }
+
+    let energy_before = filter.energy();
+    assert!(
+        energy_before > 0.0,
+        "Filter should have non-zero energy after feeding samples"
+    );
+
+    filter.reset();
+
+    assert_eq!(filter.s0, 0.0, "s0 should be reset to 0.0");
+    assert_eq!(filter.s1, 0.0, "s1 should be reset to 0.0");
+    assert_eq!(filter.s2, 0.0, "s2 should be reset to 0.0");
+    assert_eq!(filter.energy, 0.0, "energy should be reset to 0.0");
+}