From 18aa3dfaa8af1fb0751b9894da2633184746ffaa Mon Sep 17 00:00:00 2001
From: Jet Pham <55770902+jetpham@users.noreply.github.com>
Date: Tue, 3 Jun 2025 08:48:24 -0700
Subject: [PATCH] feat: Create GPIO monitor and basic callback functionality to
 print

---
 .cargo/config.toml |   2 +
 .gitignore         |   1 +
 Cargo.lock         | 505 +++++++++++++++++++++++++++++++++++++++++++++
 Cargo.toml         |  11 +
 deploy.sh          |  15 ++
 src/gpio.rs        |  49 +++++
 src/main.rs        |  33 +++
 7 files changed, 616 insertions(+)
 create mode 100644 .cargo/config.toml
 create mode 100644 .gitignore
 create mode 100644 Cargo.lock
 create mode 100644 Cargo.toml
 create mode 100755 deploy.sh
 create mode 100644 src/gpio.rs
 create mode 100644 src/main.rs

diff --git a/.cargo/config.toml b/.cargo/config.toml
new file mode 100644
index 0000000..802fa0b
--- /dev/null
+++ b/.cargo/config.toml
@@ -0,0 +1,2 @@
+[target.aarch64-unknown-linux-gnu]
+linker = "aarch64-linux-gnu-gcc" 
\ No newline at end of file
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..ea8c4bf
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+/target
diff --git a/Cargo.lock b/Cargo.lock
new file mode 100644
index 0000000..f4afb8a
--- /dev/null
+++ b/Cargo.lock
@@ -0,0 +1,505 @@
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diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..17e0d67
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,11 @@
+[package]
+name = "noisebell"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+tokio = { version = "1.36", features = ["full"] }
+anyhow = "1.0"
+tracing = "0.1"
+tracing-subscriber = "0.3"
+rppal = "0.22.1"
diff --git a/deploy.sh b/deploy.sh
new file mode 100755
index 0000000..9b868cf
--- /dev/null
+++ b/deploy.sh
@@ -0,0 +1,15 @@
+#!/bin/bash
+
+# Exit on error
+set -e
+
+echo "Building for Raspberry Pi..."
+cargo zigbuild --release --target aarch64-unknown-linux-gnu
+
+echo "Copying to Raspberry Pi..."
+scp target/aarch64-unknown-linux-gnu/release/noisebell noisebridge@noisebell.local:~/
+
+echo "Setting permissions and restarting service..."
+ssh noisebridge@noisebell.local "chmod +x ~/noisebell "
+
+echo "Deployment complete!" 
diff --git a/src/gpio.rs b/src/gpio.rs
new file mode 100644
index 0000000..c4f9803
--- /dev/null
+++ b/src/gpio.rs
@@ -0,0 +1,49 @@
+use std::time::Duration;
+
+use anyhow::Result;
+use rppal::gpio::{Gpio, InputPin, Level};
+
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+pub enum CircuitEvent {
+    Open,
+    Closed,
+}
+
+pub struct GpioMonitor {
+    pin: InputPin,
+    poll_interval: Duration,
+}
+
+impl GpioMonitor {
+    pub fn new(pin_number: u8, poll_interval: Duration) -> Result<Self> {
+        let gpio = Gpio::new()?;
+        let pin = gpio.get(pin_number)?.into_input_pullup();
+
+        Ok(Self { pin, poll_interval })
+    }
+
+    pub async fn monitor<F>(&mut self, mut callback: F) -> Result<()>
+    where
+        F: FnMut(CircuitEvent) + Send + 'static,
+    {
+        let mut previous_state = self.get_current_state();
+
+        loop {
+            let current_state = self.get_current_state();
+
+            if current_state != previous_state {
+                callback(current_state);
+                previous_state = current_state;
+            }
+
+            tokio::time::sleep(self.poll_interval).await;
+        }
+    }
+
+    pub fn get_current_state(&self) -> CircuitEvent {
+        match self.pin.read() {
+            Level::High => CircuitEvent::Open,
+            Level::Low => CircuitEvent::Closed,
+        }
+    }
+}
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..86aeada
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,33 @@
+mod gpio;
+
+use std::time::Duration;
+
+use anyhow::Result;
+use tracing::{error, info};
+
+#[tokio::main]
+async fn main() -> Result<()> {
+    // Initialize logging
+    tracing_subscriber::fmt::init();
+
+    // Initialize GPIO monitor
+    const DEFAULT_GPIO_PIN: u8 = 17;
+    let gpio_pin = std::env::var("GPIO_PIN")
+        .ok()
+        .and_then(|v| v.parse().ok())
+        .unwrap_or(DEFAULT_GPIO_PIN);
+
+    let mut gpio_monitor = gpio::GpioMonitor::new(gpio_pin, Duration::from_millis(100))?;
+
+    // Simple callback function that just logs the event
+    let callback = |event: gpio::CircuitEvent| {
+        info!("Circuit state changed: {:?}", event);
+    };
+
+    // Start GPIO monitoring
+    if let Err(e) = gpio_monitor.monitor(callback).await {
+        error!("GPIO monitoring error: {}", e);
+    }
+
+    Ok(())
+}