Working snapshot.

Reviewed-on: #1

Cargo.toml

@@ -1,11 +1,11 @@
 [package]
-name = "RUST_NMEA_PARSER"
+name = "gpsll"
 version = "0.1.0"
 edition = "2021"
 
 [dependencies]
-eframe = { version = "0.27", features = ["wgpu", "persistence"] }
-egui = "0.27"
-egui_plot = "0.27"
 serialport = "4.2"
-nmea = "0.6"
+nmea = {version = "0.6", features = ["GGA"]}
+clap = { version = "4", features = ["derive"] }
+chrono = "0.4.45"
+

README.md

@@ -1,39 +1,41 @@
 
-# Rust GPS GUI COM Port Reader
+# gpsll
 
 Using Rust and the following packages
 
 ```Rust
 [dependencies]
-eframe = { version = "0.27", features = ["wgpu", "persistence"] }
-egui = "0.27"
-egui_plot = "0.27"
 serialport = "4.2"
-nmea = "0.6"
+nmea = {version = "0.6", features = ["GGA"]}
+clap = { version = "4", features = ["derive"] }
+chrono = "0.4.45"
 ```
 
-I was able to open the U-Blox port on my GPS dongle and parse the longitude and latitude, printing the information in the streaming output for the user to see.
+I wanted a simple way to export latitude and longitude from a GPS USB dongle to the terminal.
-Also showing the Satellites its fixed to, and the satellites its attached to in the circle.
 
-## Sample GUI Output
+## Usage
+```
+A tool for echoing latitude and longitude from a GPS USB dongle.
 
-![GUI_Output](GUI_output.png)
+Usage: gpsll [OPTIONS]
 
-## Acknowledgements
+Options:
+  -c, --com <COM>  COM port
+  -h, --help       Print help
+  -V, --version    Print version
+```
 
- - Professors at Kean University
+```
- - Professors at NJIT
+Matt@computer % gpsll -c "/dev/tty.usbmodem1301"
- - Research Mentors at Kean University
+Reading from "/dev/tty.usbmodem1301"
- - StackOverflow Q&A Discussion
+2026-09-07 15:14:43, 47.11, -97.22
- - ChatGPT
+2026-09-07 15:14:44, 47.11, -97.22
- - ClaudeAI
+2026-09-07 15:14:46, 47.11, -97.22
+2026-09-07 15:14:48, 47.11, -97.22
+2026-09-07 15:14:49, 47.11, -97.22
+2026-09-07 15:14:50, 47.11, -97.22
+```
 
+## Acknowledgments
 
-## Authors
+ - Inspiration from https://github.com/FPyC639/Rust_GPS_GUI_COM_Port_Reader.
-
-- [@FPyC639](https://github.com/FPyC639)
-
-
-## Appendix
-
-[!["Buy Me A Coffee"](https://www.buymeacoffee.com/assets/img/custom_images/orange_img.png)](https://www.buymeacoffee.com/joseserra8x)

src/main.rs

@@ -1,229 +1,133 @@
-use eframe::egui;
+use chrono::Local;
-use serialport::available_ports;
+use clap::Parser;
-use std::sync::{Arc, Mutex};
+use nmea::Nmea;
-use std::thread;
+use nmea::SentenceType;
 use std::time::Duration;
 
-use egui_plot::{Plot, PlotPoints, Points, Text, Line};
+/// Command-line arguments using Clap.
+#[derive(Parser, Debug)]
+#[command(
+    author,
+    version,
+    about = "A tool for echoing latitude and longitude from a GPS USB dongle."
+)]
+struct Cli {
+    /// COM port
+    #[arg(short = 'c', long)]
+    com: Option<String>,
 
-#[derive(Default, Clone)]
+    /// Format
-struct Satellite {
+    #[arg(short = 'f', long, default_value = "csv")]
-    id: String,
+    format: Option<String>,
-    latitude: f64,
-    longitude: f64,
-    strength: u8,
 }
 
-#[derive(Default)]
+// Function to get the location
-struct AppState {
+fn get_loc(port: String, fmt: String) -> String {
-    ports: Vec<String>,
+    let mut nmea = Nmea::default();
-    selected_port: Option<String>,
-    satellites: Vec<Satellite>,
-    is_reading: bool,
 
-    // 🔵 NEW: live NMEA data buffer
+    // Harcode port for dev
-    nmea_log: Vec<String>,
+    //let port_name = "/dev/tty.usbmodem1301";
-}
+    let port_name = port;
 
-pub struct MyApp {
+    //fn read_loc(com: &str) -> &str {
-    state: Arc<Mutex<AppState>>,
+    //println!("Reading from {port_name}");
-}
 
-impl Default for MyApp {
+    let port = serialport::new(port_name, 9600)
-    fn default() -> Self {
+        .timeout(Duration::from_millis(1000))
-        let ports = available_ports()
+        .open();
-            .map(|ps| ps.into_iter().map(|p| p.port_name).collect())
-            .unwrap_or_default();
 
-        Self {
+    if let Ok(mut serial) = port {
-            state: Arc::new(Mutex::new(AppState {
+        let mut buf = [0u8; 1024];
-                ports,
-                ..Default::default()
-            })),
-        }
-    }
-}
 
-// =====================================================================
+        loop {
-// Satellite Map Drawing Method
+            match serial.read(&mut buf) {
-// =====================================================================
+                Ok(n) => {
-impl MyApp {
+                    let data = String::from_utf8_lossy(&buf[..n]);
-    fn draw_satellite_map(&self, ui: &mut egui::Ui, sats: &[Satellite]) {
-        Plot::new("satellite_map")
-            .width(300.0)
-            .height(300.0)
-            .view_aspect(1.0)
-            .show(ui, |plot_ui| {
-                // Draw outline circle
-                let circle: PlotPoints = (0..360)
-                    .map(|deg| {
-                        let rad = (deg as f64).to_radians();
-                        [rad.cos(), rad.sin()]
-                    })
-                    .collect::<Vec<_>>()
-                    .into();
 
-                plot_ui.line(Line::new(circle));
+                    for line in data.lines() {
+                        // Check sentence type
+                        let sentence_type = match nmea.parse(line) {
+                            Ok(sentence_type) => sentence_type,
+                            Err(_) => {
+                                break;
+                            }
+                        };
 
-                // Draw satellites
+                        // Only keep the GLL sentences
-                for sat in sats {
+                        if sentence_type == SentenceType::GLL {
-                    let az = sat.longitude.to_radians();
+                            let lat = match nmea.latitude {
-                    let el = sat.latitude.to_radians();
+                                Some(lat) => lat,
-
+                                None => -9999.25,
-                    let x = el.cos() * az.cos();
+                            };
-                    let y = el.cos() * az.sin();
+                            let lon = match nmea.longitude {
-
+                                Some(lon) => lon,
-                    plot_ui.points(Points::new(vec![[x, y]]).radius(3.0));
+                                None => -9999.25,
-                    plot_ui.text(Text::new([x, y].into(), sat.id.clone()));
+                            };
-                }
+                            let date = Local::now();
-            });
+                            //println!("{}, {lat}, {lon}", date.format("%Y-%m-%d %H:%M:%S"));
-    }
+                            if fmt == "csv" {
-}
+                                return format!(
-
+                                    "{},{:.8},{:.8}",
-// =====================================================================
+                                    date.format("%Y-%m-%d %H:%M:%S"),
-// Main App UI
+                                    lat,
-// =====================================================================
+                                    lon
-impl eframe::App for MyApp {
+                                );
-    fn update(&mut self, ctx: &egui::Context, _frame: &mut eframe::Frame) {
+                            } else if fmt == "ssv" {
-        let mut state = self.state.lock().unwrap();
+                                return format!(
-
+                                    "\"{}\" {:.8} {:.8}",
-        // Main panel
+                                    date.format("%Y-%m-%d %H:%M:%S"),
-        egui::CentralPanel::default().show(ctx, |ui| {
+                                    lat,
-            ui.heading("Select COM Port");
+                                    lon
-
+                                );
-            let ports = state.ports.clone();
-
-            egui::ComboBox::from_label("COM Port")
-                .selected_text(state.selected_port.as_deref().unwrap_or("Select a Port"))
-                .show_ui(ui, |cb| {
-                    for port in ports {
-                        cb.selectable_value(
-                            &mut state.selected_port,
-                            Some(port.clone()),
-                            port,
-                        );
-                    }
-                });
-
-            if ui.button("Start Reading").clicked() && !state.is_reading {
-                if let Some(port_name) = state.selected_port.clone() {
-                    let state_clone = Arc::clone(&self.state);
-
-                    // Thread for GPS streaming
-                    thread::spawn(move || {
-                        let port = serialport::new(port_name, 9600)
-                            .timeout(Duration::from_millis(1000))
-                            .open();
-
-                        if let Ok(mut serial) = port {
-                            let mut buf = [0u8; 1024];
-
-                            loop {
-                                match serial.read(&mut buf) {
-                                    Ok(n) => {
-                                        let data = String::from_utf8_lossy(&buf[..n]);
-                                        let mut satellites = Vec::new();
-
-                                        for line in data.lines() {
-
-                                            // 🔵 Append NMEA line to log
-                                            {
-                                                let mut st = state_clone.lock().unwrap();
-                                                st.nmea_log.push(line.to_string());
-
-                                                // Keep log trimmed
-                                                if st.nmea_log.len() > 500 {
-                                                    st.nmea_log.remove(0);
-                                                }
-                                            }
-
-                                            // Parse GSV
-                                            if line.starts_with("$GPGSV") {
-                                                let fields: Vec<&str> = line.split(',').collect();
-                                                let mut i = 4;
-
-                                                while i + 3 < fields.len() {
-                                                    satellites.push(Satellite {
-                                                        id: fields[i].to_string(),
-                                                        latitude: fields[i + 1].parse().unwrap_or(0.0),
-                                                        longitude: fields[i + 2].parse().unwrap_or(0.0),
-                                                        strength: fields[i + 3].parse().unwrap_or(0),
-                                                    });
-                                                    i += 4;
-                                                }
-                                            }
-                                        }
-
-                                        // Update satellites
-                                        let mut st = state_clone.lock().unwrap();
-                                        st.satellites = satellites;
-                                    }
-                                    Err(_) => break,
-                                }
-
-                                thread::sleep(Duration::from_millis(200));
                             }
                         }
-                    });
+                    }
-
-                    state.is_reading = true;
                 }
+                Err(_) => {} // lol that I can just not put a return in?
             }
+        }
+    } else {
+        // https://github.com/serialport/serialport-rs#listing-available-ports
+        let ports = serialport::available_ports().expect("No ports found!");
+        println!("Available Ports:");
+        for p in ports {
+            println!("{}", p.port_name);
+        }
 
-            ui.separator();
+        return format!("\nCould not connect to port. Is it listed above?");
-            ui.heading("Satellites");
-
-            egui::ScrollArea::vertical().show(ui, |ui| {
-                for sat in &state.satellites {
-                    ui.horizontal(|ui| {
-                        ui.label(format!("ID: {}", sat.id));
-                        ui.label(format!("Elv: {:.2}", sat.latitude));
-                        ui.label(format!("Azm: {:.2}", sat.longitude));
-                        ui.label(format!("Strength: {}", sat.strength));
-                    });
-                }
-            });
-        });
-
-        // =====================================================================
-        // NEW: Live GPS Stream Window
-        // =====================================================================
-        egui::Window::new("GPS Stream")
-            .default_width(400.0)
-            .default_height(300.0)
-            .resizable(true)
-            .show(ctx, |ui| {
-                ui.label("Live NMEA Data:");
-
-                egui::ScrollArea::vertical()
-                    .stick_to_bottom(true)
-                    .show(ui, |ui| {
-                        for line in &state.nmea_log {
-                            ui.monospace(line);
-                        }
-                    });
-            });
-
-        // =====================================================================
-        // Mini floating sky map
-        // =====================================================================
-        egui::Area::new("mini_sky_map".into())
-            .anchor(egui::Align2::RIGHT_TOP, [-10.0, 10.0])
-            .show(ctx, |ui| {
-                self.draw_satellite_map(ui, &state.satellites);
-            });
     }
 }
 
-// =====================================================================
+fn main() {
-// Run
+    // Arguments
-// =====================================================================
+    let cli = Cli::parse();
-fn main() -> eframe::Result<()> {
+
-    let options = eframe::NativeOptions::default();
+    let com = match cli.com {
+        Some(com) => com,
+        None => {
+            // https://github.com/serialport/serialport-rs#listing-available-ports
+            let ports = serialport::available_ports().expect("No ports found!");
+            println!("Available Ports:");
+            for p in ports {
+                println!("{}", p.port_name);
+            }
+            println!("\nMissing `-c` port argument, use one listed above.");
+            return;
+        } //todo!()
+    };
+
+    let fmt = match cli.format {
+        Some(fmt) => fmt,
+        None => {
+            return;
+        } //todo!()
+    };
+
+    // Run the function
+    // Max rate is about 1 measurement per second
+    //loop {
+        let result = get_loc(com.clone(), fmt.clone());
+        println!("{result}");
+    //}
 
-    eframe::run_native(
-        "NMEA GPS Viewer",
-        options,
-        Box::new(|_cc| Box::new(MyApp::default())),
-    )
 }