chore: fix several clippy warnings

src/bus.rs

@@ -214,8 +214,8 @@ impl Bus {
                     0xFF01 => self.serial.next = byte,
                     0xFF02 => self.serial.control = byte.into(),
                     0xFF04 => self.timer.divider = 0x00,
-                    0xFF05 => self.timer.counter = byte.into(),
+                    0xFF05 => self.timer.counter = byte,
-                    0xFF06 => self.timer.modulo = byte.into(),
+                    0xFF06 => self.timer.modulo = byte,
                     0xFF07 => self.timer.control = byte.into(),
                     0xFF0F => self.set_interrupt_flag(byte),
                     0xFF11 => self.sound.ch1.sound_duty = byte.into(),

src/cpu.rs

@@ -68,7 +68,7 @@ impl Cpu {
     }
 
     pub fn load_cartridge(&mut self, path: &str) -> std::io::Result<()> {
-        Ok(self.bus.load_cartridge(path)?)
+        self.bus.load_cartridge(path)
     }
 }
 
@@ -155,7 +155,7 @@ impl Cpu {
         let req = self.read_byte(0xFF0F);
         let enabled = self.read_byte(0xFFFF);
 
-        if let Some(_) = self.halted() {
+        if self.halted.is_some() {
             // When we're here either a HALT with IME set or
             // a HALT with IME not set and No pending Interrupts was called
 
@@ -335,7 +335,7 @@ impl Cpu {
         write!(handle, "({:02X} ", self.read_byte(self.reg.pc))?;
         write!(handle, "{:02X} ", self.read_byte(self.reg.pc + 1))?;
         write!(handle, "{:02X} ", self.read_byte(self.reg.pc + 2))?;
-        write!(handle, "{:02X})\n", self.read_byte(self.reg.pc + 3))?;
+        writeln!(handle, "{:02X})", self.read_byte(self.reg.pc + 3))?;
         handle.flush()?;
 
         Ok(())

src/instruction.rs

@@ -613,12 +613,10 @@ impl Instruction {
 
                 let halt_state = if cpu.ime() {
                     ImeSet
-                } else {
+                } else if req & enabled != 0 {
-                    if req & enabled != 0 {
                     SomePending
                 } else {
                     NonePending
-                    }
                 };
 
                 cpu.halt(halt_state);
@@ -1583,6 +1581,7 @@ impl Instruction {
 
     fn from_unprefixed_byte(cpu: &mut Cpu, opcode: u8) -> Self {
         // https://gb-archive.github.io/salvage/decoding_gbz80_opcodes/Decoding%20Gamboy%20Z80%20Opcodes.html
+        #![allow(clippy::many_single_char_names)]
 
         let x = (opcode >> 6) & 0x03;
         let y = (opcode >> 3) & 0x07;
@@ -1770,6 +1769,8 @@ impl Instruction {
     }
 
     fn from_prefixed_byte(cpu: &mut Cpu) -> Self {
+        #![allow(clippy::many_single_char_names)]
+
         let pc = cpu.register_pair(RegisterPair::PC);
         let opcode = cpu.read_imm_byte(pc); // FIXME: Should the PC be incremented here?
 

src/ppu.rs

@@ -144,7 +144,7 @@ impl Ppu {
             let tile_number = self.read_byte(tile_addr);
 
             let tile_data_addr = match self.lcd_control.tile_data_addr() {
-                TileDataAddress::X8800 => (0x9000 as i32 + (tile_number as i32 * 16)) as u16,
+                TileDataAddress::X8800 => (0x9000_i32 + (tile_number as i32 * 16)) as u16,
                 TileDataAddress::X8000 => 0x8000 + (tile_number as u16 * 16),
             };
 
@@ -554,8 +554,8 @@ impl Pixels {
     }
 
     pub fn pixel(&self, bit: usize) -> u8 {
-        let higher = &self.0[0] >> bit;
+        let higher = self.0[0] >> bit;
-        let lower = &self.0[1] >> bit;
+        let lower = self.0[1] >> bit;
 
         (higher & 0x01) << 1 | lower & 0x01
     }