command line option to connect serial to stdout

src/main.rs

@@ -51,8 +51,12 @@ struct Args {
     #[arg(short, long)]
     verbose: bool,
 
-    /// Show cycle count
+    /// Connect the serial port output to stdout
     #[arg(short, long)]
+    connect_serial: bool,
+
+    /// Show cycle count
+    #[arg(long)]
     cycle_count: bool,
 
     /// Show tile window
@@ -127,7 +131,7 @@ fn main() {
     window.topmost(true);
 
     let mut cpu = Cpu::new(
-        Memory::init(bootrom, rom),
+        Memory::init(bootrom, rom, args.connect_serial),
         window,
         args.tile_window,
         bootrom_enabled,

src/processor/memory.rs

@@ -29,7 +29,12 @@ pub struct Memory {
 }
 
 impl Memory {
-    pub fn init(bootrom: Option<Vec<u8>>, rom: Rom) -> Self {
+    pub fn init(bootrom: Option<Vec<u8>>, rom: Rom, connect_serial: bool) -> Self {
+        let serial = if connect_serial {
+            Serial::default().connected()
+        } else {
+            Serial::default()
+        };
         Self {
             bootrom,
             rom,
@@ -45,7 +50,7 @@ impl Memory {
             user_mode: false,
             joypad: Joypad::default(),
             apu: Apu::init_default(),
-            serial: Serial::default(),
+            serial,
         }
     }
 

src/processor/memory/mmio/serial.rs

@@ -39,6 +39,11 @@ pub struct Serial {
 }
 
 impl Serial {
+    pub fn connected(mut self) -> Self {
+        self.is_connected = true;
+        self
+    }
+
     pub fn tick(&mut self, steps: usize) -> bool {
         let mut will_interrupt = false;
         if !self.is_connected {