commit 009402c47e78f45702fb1b71e7bb601e26c8e61f
Author: Bradley Gannon <bradley@bradleygannon.com>
Date: Sun, 8 Feb 2026 16:07:29 -0500
Add basic tone generator using R-2R ladder
Diffstat:
8 files changed, 1221 insertions(+), 0 deletions(-)
diff --git a/.cargo/config.toml b/.cargo/config.toml
@@ -0,0 +1,9 @@
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+
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+
+[unstable]
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diff --git a/.gitignore b/.gitignore
@@ -0,0 +1 @@
+/target
diff --git a/Cargo.lock b/Cargo.lock
@@ -0,0 +1,1073 @@
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diff --git a/Cargo.toml b/Cargo.toml
@@ -0,0 +1,38 @@
+[package]
+name = "arduino-aprs"
+version = "0.1.0"
+authors = ["Bradley Gannon <bradley@bradleygannon.com>"]
+edition = "2021"
+license = "MIT OR Apache-2.0"
+
+[[bin]]
+name = "arduino-aprs"
+test = false
+bench = false
+
+[dependencies]
+avr-device = "0.8.1"
+crc = "3.4.0"
+#cyberpig = { path = "/home/bradley/Projects/cyberpig/" }
+embedded-hal = "1.0"
+heapless = "0.9.2"
+nb = "1.1.0"
+panic-halt = "1.0.0"
+ufmt = "0.2.0"
+
+[dependencies.arduino-hal]
+git = "https://github.com/rahix/avr-hal"
+rev = "e5c8f37fe48419956e722490a82b9ca9b9fc61a2"
+features = ["arduino-nano"]
+
+[profile.dev]
+panic = "abort"
+lto = true
+opt-level = "s"
+
+[profile.release]
+panic = "abort"
+codegen-units = 1
+debug = true
+lto = true
+opt-level = "s"
diff --git a/Ravedude.toml b/Ravedude.toml
@@ -0,0 +1,5 @@
+[general]
+board = "nano"
+open-console = true
+serial-baudrate = 57600
+port = "/dev/ttyUSB1"
diff --git a/rust-toolchain.toml b/rust-toolchain.toml
@@ -0,0 +1,4 @@
+[toolchain]
+channel = "nightly-2025-04-27"
+components = ["rust-src"]
+profile = "minimal"
diff --git a/shell.nix b/shell.nix
@@ -0,0 +1,12 @@
+let
+ nixpkgs = fetchTarball "https://github.com/NixOS/nixpkgs/tarball/nixos-25.11";
+ pkgs = import nixpkgs { config = {}; overlays = []; };
+in
+
+pkgs.mkShellNoCC {
+ packages = with pkgs; [
+ avrdude
+ pkgsCross.avr.buildPackages.gcc
+ ravedude
+ ];
+}
diff --git a/src/main.rs b/src/main.rs
@@ -0,0 +1,79 @@
+#![no_std]
+#![no_main]
+#![feature(abi_avr_interrupt)]
+
+use core::{
+ ptr::{read_volatile, write_volatile},
+ sync::atomic::{AtomicU16, Ordering},
+};
+
+use embedded_hal::digital::OutputPin;
+use panic_halt as _;
+
+static COUNTER: AtomicU16 = AtomicU16::new(0);
+static INCREMENT: AtomicU16 = AtomicU16::new(0);
+static SINE_TABLE: [u8; 32] = [
+ 16, 19, 22, 24, 27, 29, 30, 31, 31, 31, 30, 29, 27, 24, 22, 19, 16, 12, 9, 7, 4, 2, 1, 0, 0, 0,
+ 1, 2, 4, 7, 9, 12,
+];
+static mut UPDATE_DAC: bool = false;
+
+const _MARK_INCREMENT: u16 = 2048;
+const SPACE_INCREMENT: u16 = 3755;
+
+#[avr_device::interrupt(atmega328p)]
+fn TIMER0_COMPA() {
+ let old_counter = COUNTER.load(Ordering::SeqCst);
+ let new_counter = old_counter.wrapping_add(INCREMENT.load(Ordering::SeqCst));
+ let old_index = old_counter >> 11;
+ let new_index = new_counter >> 11;
+ if new_index != old_index {
+ unsafe { UPDATE_DAC = true };
+ }
+ COUNTER.store(new_counter, Ordering::SeqCst);
+}
+
+#[arduino_hal::entry]
+fn main() -> ! {
+ unsafe { avr_device::interrupt::enable() };
+
+ let dp = arduino_hal::Peripherals::take().unwrap();
+ let pins = arduino_hal::pins!(dp);
+
+ let mut _serial = arduino_hal::default_serial!(dp, pins, 57600);
+
+ let dac_timer = dp.TC0;
+ dac_timer.tccr0a().write(|w| w.wgm0().ctc());
+ dac_timer.tccr0b().write(|w| w.cs0().prescale_8());
+ // 52 * 8 = 416 cycles; at 16 MHz this gives a period of 26 µs (about 38460 Hz)
+ dac_timer.ocr0a().write(|w| w.set(52));
+ // enable interrupt for output compare match A
+ dac_timer.timsk0().write(|w| w.ocie0a().set_bit());
+
+ INCREMENT.store(SPACE_INCREMENT, Ordering::SeqCst);
+
+ let mut dac_0 = pins.d2.into_output();
+ let mut dac_1 = pins.d3.into_output();
+ let mut dac_2 = pins.d4.into_output();
+ let mut dac_3 = pins.d5.into_output();
+ let mut dac_4 = pins.d6.into_output();
+ let mut led = pins.d13.into_output();
+
+ loop {
+ if unsafe { read_volatile(&raw const UPDATE_DAC) } {
+ let sine_index =
+ ((COUNTER.load(Ordering::SeqCst) >> 11) as usize).clamp(0, SINE_TABLE.len());
+ if let Some(sine_value) = SINE_TABLE.get(sine_index) {
+ let _ = dac_0.set_state((sine_value & 0b10000 != 0).into());
+ let _ = dac_1.set_state((sine_value & 0b01000 != 0).into());
+ let _ = dac_2.set_state((sine_value & 0b00100 != 0).into());
+ let _ = dac_3.set_state((sine_value & 0b00010 != 0).into());
+ let _ = dac_4.set_state((sine_value & 0b00001 != 0).into());
+ }
+ led.toggle();
+ unsafe {
+ write_volatile(&raw mut UPDATE_DAC, false);
+ }
+ }
+ }
+}
