Serial thread and tx channel, more App state work

Signed-off-by: Slendi <slendi@socopon.com>

src/main.rs

@@ -1,5 +1,18 @@
+use std::{
+    sync::{
+        Arc, Mutex,
+        mpsc::{self, Receiver, Sender},
+    },
+    thread::{self, Thread},
+    time::Duration,
+};
+
 use anyhow::{Result, anyhow};
-use macroquad::color::*;
+use macroquad::{
+    color::*,
+    miniquad::{error, info},
+};
+use midly::Smf;
 use serialport::SerialPortType;
 
 #[derive(Clone, Copy, Debug)]
@@ -133,14 +146,81 @@ impl Song {
             pattern_order: Vec::new(),
         }
     }
+
+    pub fn from_midi(_smf: Smf) -> Result<Self> {
+        todo!("TBD");
+    }
 }
 
-#[derive(Default)]
-struct App {}
+struct AppSongState {
+    pub song: Song,
+    pub current_pattern: usize,
+    pub current_row: usize,
+    pub current_column: u8,
+    pub playing: bool,
+}
+
+pub enum SerialCommand {
+    Instruction(u8, Instruction),
+    Stop,
+}
+
+struct App {
+    song_state: Option<AppSongState>,
+    tx: Sender<SerialCommand>,
+}
 
 impl App {
     pub fn new() -> Self {
-        Self { ..App::default() }
+        let (tx, rx) = mpsc::channel();
+        Self::spawn_serial_worker(rx);
+        Self {
+            song_state: None,
+            tx,
+        }
+    }
+
+    fn spawn_serial_worker(rx: Receiver<SerialCommand>) {
+        thread::spawn(move || {
+            let mut device: Option<SerialDevice> = None;
+            loop {
+                if device.is_none() {
+                    match SerialDevice::new() {
+                        Ok(new_device) => {
+                            info!("Serial device connected");
+                            device = Some(new_device);
+                        }
+                        Err(_err) => {
+                            thread::sleep(Duration::from_secs(1));
+                            continue;
+                        }
+                    }
+                }
+
+                match rx.recv_timeout(Duration::from_millis(100)) {
+                    Ok(command) => {
+                        if let Some(dev) = device.as_mut() {
+                            match command {
+                                SerialCommand::Instruction(ch, instr) => {
+                                    if let Err(e) = dev.execute(ch, instr) {
+                                        error!("Disconnected: {e}");
+                                        device = None;
+                                    }
+                                }
+                                SerialCommand::Stop => {
+                                    if let Err(e) = dev.stop() {
+                                        error!("Disconnected: {e}");
+                                        device = None;
+                                    }
+                                }
+                            }
+                        }
+                    }
+                    Err(mpsc::RecvTimeoutError::Timeout) => {}
+                    Err(_) => break,
+                }
+            }
+        });
     }
 
     pub async fn run(&self) {