dnutiu/chip8-rust
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implement timer instructions

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This commit is contained in:
Denis-Cosmin NUTIU 2024-12-07 18:23:00 +02:00
parent dec7183ce7
commit f8f79bc2e6
2 changed files with 32 additions and 0 deletions
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17
src/emulator.rs
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@ -277,21 +277,25 @@ where
self.program_counter = address + offset as u16
}
ProcessorInstruction::GenerateRandomNumber(register, data) => {
trace!("Generate random number");
self.registers[register as usize] = rand::thread_rng().gen_range(0x00..0xFF) & data
}
ProcessorInstruction::SkipEqualVXData(vx, data) => {
trace!("SkipEqualVXData");
let vx_data = self.registers[vx as usize];
if vx_data == data {
self.program_counter += 2
}
}
ProcessorInstruction::SkipNotEqualVXData(vx, data) => {
trace!("SkipNotEqualVXData");
let vx_data = self.registers[vx as usize];
if vx_data != data {
self.program_counter += 2
}
}
ProcessorInstruction::SkipEqualVXVY(vx, vy) => {
trace!("SkipNotEqualVXData");
let vx_data = self.registers[vx as usize];
let vy_data = self.registers[vy as usize];
if vx_data == vy_data {
@ -299,12 +303,25 @@ where
}
}
ProcessorInstruction::SkipNotEqualVXVY(vx, vy) => {
trace!("SkipNotEqualVXVY");
let vx_data = self.registers[vx as usize];
let vy_data = self.registers[vy as usize];
if vx_data != vy_data {
self.program_counter += 2
}
}
ProcessorInstruction::SetVXToDelayTimer(vx) => {
trace!("SetVXToDelayTimer");
self.registers[vx as usize] = self.delay_timer
}
ProcessorInstruction::SetDelayTimer(vx) => {
trace!("SetDelayTimer");
self.delay_timer = self.registers[vx as usize]
}
ProcessorInstruction::SetSoundTimer(vx) => {
trace!("SetSoundTimer");
self.sound_timer = self.registers[vx as usize]
}
_ => {
warn!("Unknown instruction: {:04x}, skipping.", instruction);
}

15
src/instruction.rs
View file

@ -62,6 +62,12 @@ pub enum ProcessorInstruction {
SkipEqualVXVY(u8, u8),
/// Skip the next instruction if VX is not equal to VY.
SkipNotEqualVXVY(u8, u8),
/// Sets the value of the VX instruction to the current value of the delay timer.
SetVXToDelayTimer(u8),
/// Sets the delay timer to the value in VX.
SetDelayTimer(u8),
/// Sets the sound timer to the value in VX.
SetSoundTimer(u8),
/// Unknown instruction
UnknownInstruction,
}
@ -201,6 +207,15 @@ impl Instruction {
Self::grab_first_nibble(data),
Self::grab_middle_nibble(data),
),
(0xF, _, 0x0, 0x7) => ProcessorInstruction::SetVXToDelayTimer(
Self::grab_first_nibble(data)
),
(0xF, _, 0x1, 0x5) => ProcessorInstruction::SetDelayTimer(
Self::grab_first_nibble(data)
),
(0xF, _, 0x1, 0x8) => ProcessorInstruction::SetSoundTimer(
Self::grab_first_nibble(data)
),
// Unknown instruction
_ => ProcessorInstruction::UnknownInstruction,
}