bootrom as option

src/main.rs

@@ -45,11 +45,7 @@ struct Args {
 
     /// BootROM path
     #[arg(short, long)]
-    bootrom: String,
-
-    /// Just run BootROM
-    #[arg(long)]
-    run_bootrom: bool,
+    bootrom: Option<String>,
 
     /// Verbose print
     #[arg(short, long)]
@@ -102,12 +98,18 @@ fn main() {
             return;
         }
     };
-    let bootrom: Vec<u8> = match fs::read(args.bootrom) {
-        Ok(data) => data,
-        Err(e) => {
-            println!("Error reading bootROM: {e}");
-            return;
+
+    let bootrom_enabled = args.bootrom.is_some();
+    let bootrom: Option<Vec<u8>> = if let Some(path) = args.bootrom {
+        match fs::read(path) {
+            Ok(data) => Some(data),
+            Err(e) => {
+                println!("Error reading bootROM: {e}");
+                return;
+            }
         }
+    } else {
+        None
     };
 
     let mut window = Window::new(
@@ -125,10 +127,10 @@ fn main() {
     window.topmost(true);
 
     let mut cpu = Cpu::new(
-        Memory::init(bootrom, args.run_bootrom, rom),
+        Memory::init(bootrom, rom),
         window,
         args.tile_window,
-        args.run_bootrom,
+        bootrom_enabled,
         Gilrs::new().unwrap(),
     );
 

src/processor/memory.rs

@@ -11,8 +11,7 @@ pub(crate) type Address = u16;
 
 #[allow(dead_code)]
 pub struct Memory {
-    bootrom: Vec<u8>,
-    bootrom_enabled: bool,
+    bootrom: Option<Vec<u8>>,
     rom: Rom,
     vram: [u8; 8192],
     ram: [u8; 8192],
@@ -30,10 +29,9 @@ pub struct Memory {
 }
 
 impl Memory {
-    pub fn init(bootrom: Vec<u8>, bootrom_enabled: bool, rom: Rom) -> Self {
+    pub fn init(bootrom: Option<Vec<u8>>, rom: Rom) -> Self {
         Self {
             bootrom,
-            bootrom_enabled,
             rom,
             vram: [0x0; 8192],
             ram: [0x0; 8192],
@@ -56,8 +54,8 @@ impl Memory {
             0x0..0x8000 => {
                 // rom access
                 // todo - switchable rom banks
-                if self.bootrom_enabled && ((address as usize) < self.bootrom.len()) {
-                    self.bootrom[address as usize]
+                if let Some(bootrom) = &self.bootrom && (address as usize) < bootrom.len() {
+                    bootrom[address as usize]
                 } else {
                     self.rom.get(address)
                 }
@@ -91,7 +89,7 @@ impl Memory {
             0xFE00..0xFEA0 => self.oam[(address - 0xFE00) as usize] = data,
             0xFEA0..0xFF00 => {}
             0xFF00..0xFF4C => self.set_io(address, data),
-            0xFF50 => self.bootrom_enabled = false,
+            0xFF50 => self.bootrom = None,
             0xFF4C..0xFF50 | 0xFF51..0xFF80 => {}
             0xFF80..0xFFFF => self.cpu_ram[(address - 0xFF80) as usize] = data,
             0xFFFF => {

src/processor/mod.rs

@@ -50,7 +50,7 @@ impl Cpu {
         run_bootrom: bool,
         gamepad_handler: Gilrs,
     ) -> Self {
-        if run_bootrom {
+        if !run_bootrom {
             memory.cpu_ram_init();
         }
         Self {