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9808616203
...
705dcd3185
Author | SHA1 | Date |
---|---|---|
august kline | 705dcd3185 | |
august kline | 40ede17ae1 |
File diff suppressed because it is too large
Load Diff
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@ -8,5 +8,4 @@ edition = "2021"
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[dependencies]
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bdf = "0.6.0"
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bitvec = "1.0.1"
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iced = { version = "0.12.0", features = ["canvas", "smol"] }
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minifb = "0.25.0"
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|
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25546
src/Cozette.sfd
25546
src/Cozette.sfd
File diff suppressed because it is too large
Load Diff
89
src/cpu.rs
89
src/cpu.rs
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@ -1,14 +1,12 @@
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use crate::error::{ExecutionError, GeorgeError, GeorgeErrorKind, MemoryError};
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use crate::instructions::{get_instruction, Instruction};
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use crate::memory::{self, Mem};
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use crate::memory::Mem;
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use crate::types::{Byte, Word};
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use std::path::PathBuf;
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use std::process::exit;
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use std::sync::Mutex;
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use std::time::Duration;
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use std::{
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str::FromStr,
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sync::{Arc, RwLock},
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thread::sleep,
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};
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use std::{str::FromStr, sync::Arc, thread::sleep};
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#[derive(Clone, Copy)]
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pub enum StatusFlag {
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@ -31,13 +29,13 @@ pub struct Cpu {
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pub p: Byte, // Status Register
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pub irq: bool,
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pub nmi: bool,
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pub memory: Arc<RwLock<Mem>>,
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pub memory: Arc<Mutex<Mem>>,
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pub pending_cycles: usize,
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cycle_count: usize,
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}
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impl Cpu {
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pub fn new(memory: Arc<RwLock<Mem>>) -> Self {
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pub fn new(memory: Arc<Mutex<Mem>>) -> Self {
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Cpu {
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a: 0x00,
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x: 0x00,
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@ -59,14 +57,14 @@ impl Cpu {
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Ok(())
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}
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pub fn read(&self, address: Word) -> Result<Byte, MemoryError> {
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let memory = match self.memory.try_read() {
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let memory = match self.memory.lock() {
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Ok(read) => read,
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Err(_) => {
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println!("Couldn't acquire read lock on memory in cpu thread");
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return Err(MemoryError::NoDataAtAddress);
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} // TODO: upgrade this error type to a `GeorgeError` and make an errorkind for thread lock errors
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};
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memory.read(address)
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Ok(memory.read(address))
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}
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pub fn read_word(&self, address: Word) -> Result<Word, MemoryError> {
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let low_byte = self.read(address)?;
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@ -95,7 +93,7 @@ impl Cpu {
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pub fn pop_stack(&mut self) -> Result<Byte, ExecutionError> {
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let byte = self.read(self.stack_addr())?;
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self.s += 0x1;
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self.s = self.s.wrapping_add(0x1);
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Ok(byte)
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}
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@ -121,21 +119,21 @@ impl Cpu {
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}
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pub fn write(&mut self, address: Word, data: Byte) -> Result<(), MemoryError> {
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let mut memory = match self.memory.write() {
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let mut memory = match self.memory.lock() {
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Ok(write) => write,
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Err(_) => {
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println!("Couldn't acquire write lock on memory in cpu thread");
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return Err(MemoryError::NoDataAtAddress);
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} // TODO: upgrade this error type to a `GeorgeError` and make an errorkind for thread lock errors
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};
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memory.write(address, data)?;
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memory.write(address, data);
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Ok(())
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}
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pub fn execute(&mut self) {
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self.cycle().unwrap();
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self.cycle();
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while self.pending_cycles != 0 {
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self.cycle().unwrap();
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self.cycle();
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}
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}
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@ -166,7 +164,7 @@ impl Cpu {
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// }
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// }
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// }
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pub fn cycle(&mut self) -> Result<(), GeorgeError> {
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pub fn cycle(&mut self) {
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sleep(Duration::from_nanos(100));
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if self.pending_cycles == 0 {
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if self.nmi || (self.irq && !self.get_flag(StatusFlag::IrqDisable)) {
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@ -178,10 +176,11 @@ impl Cpu {
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match self.read_word(0xFFFA) {
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Ok(word) => self.pc = word,
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Err(error) => {
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return Err(GeorgeError {
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let george_error = GeorgeError {
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kind: GeorgeErrorKind::Memory(error),
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desc: String::from_str("Couldn't read NMI vector").unwrap(),
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})
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};
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println!("{:?}", george_error.desc);
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}
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};
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self.pending_cycles = 8;
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@ -189,10 +188,11 @@ impl Cpu {
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match self.read_word(0xFFFE) {
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Ok(word) => self.pc = word,
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Err(error) => {
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return Err(GeorgeError {
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let george_error = GeorgeError {
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kind: GeorgeErrorKind::Memory(error),
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desc: String::from_str("Couldn't read IRQ vector").unwrap(),
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})
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};
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println!("{:?}", george_error.desc);
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}
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};
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self.pending_cycles = 7
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@ -204,62 +204,73 @@ impl Cpu {
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let opcode = match self.read(self.pc) {
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Ok(byte) => byte,
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Err(error) => {
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return Err(GeorgeError {
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desc: String::from_str("Failed to read the program counter!").unwrap(),
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let george_error = GeorgeError {
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desc: format!("Failed to read from memory at address {:#06x}!", self.pc),
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kind: GeorgeErrorKind::Memory(error),
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})
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};
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println!("{:?}", george_error.desc);
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return;
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}
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};
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let instruction = get_instruction(opcode);
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match instruction {
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Instruction::Valid(valid_instruction) => {
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println!("a: {a:#04x}, x: {x:#04x}, y: {y:#04x}, pc: {pc:#06x}, sp: {s:#04x}, sr: {p:#010b}, irq: {irq:?}, nmi: {nmi:?}", a = self.a, x = self.x, y = self.y, pc = self.pc, s = self.s, p = self.p, irq = self.irq, nmi = self.nmi);
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println!(
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"Instruction: {:?}, {:#04x}",
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valid_instruction.opcode, opcode
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);
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println!("");
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//println!("a: {a:#04x}, x: {x:#04x}, y: {y:#04x}, pc: {pc:#06x}, sp: {s:#04x}, sr: {p:#010b}, irq: {irq:?}, nmi: {nmi:?}", a = self.a, x = self.x, y = self.y, pc = self.pc, s = self.s, p = self.p, irq = self.irq, nmi = self.nmi);
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//println!(
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// "Instruction: {:?}, {:#04x}",
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// valid_instruction.opcode, opcode
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//);
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//println!("");
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self.pc += 1;
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match valid_instruction.opcode.call(self) {
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Ok(_) => {
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self.pending_cycles += valid_instruction.cycles as usize;
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},
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Err(error) => return Err(GeorgeError{
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}
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Err(error) => {
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let george_error = GeorgeError{
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desc: format!("An IncompatibleAddrMode was used at address {:#06x} for instruction {:?}",
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self.pc, valid_instruction).to_string(), kind: error})
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self.pc, valid_instruction).to_string(), kind: error};
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println!("{:?}", george_error.desc);
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}
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};
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}
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Instruction::Invalid(invalid_instruction) => match invalid_instruction.opcode {
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0x02 => {
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let memory = match self.memory.try_read() {
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let memory = match self.memory.lock() {
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Ok(read) => read,
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Err(_) => {
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println!("Couldn't acquire read lock on memory in cpu thread");
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return Err(GeorgeError {
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let george_error = GeorgeError {
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kind: GeorgeErrorKind::Memory(MemoryError::Unwritable),
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desc: "Couldn't acquire read lock on memory in cpu thread"
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.to_string(),
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});
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};
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println!("{:?}", george_error.desc);
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return;
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}
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};
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memory.dump().unwrap();
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println!("a: {a:#04x}, x: {x:#04x}, y: {y:#04x}, pc: {pc:#06x}, sp: {s:#04x}, sr: {p:#010b}, irq: {irq:?}, nmi: {nmi:?}", a = self.a, x = self.x, y = self.y, pc = self.pc, s = self.s, p = self.p, irq = self.irq, nmi = self.nmi);
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memory
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.dump(PathBuf::from_str("./cpu_dump.bin").unwrap())
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.unwrap();
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exit(1);
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}
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_ => {
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return Err(GeorgeError {
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let george_error = GeorgeError {
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kind: GeorgeErrorKind::Execution(ExecutionError::InvalidInstruction),
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desc: format!(
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"An invalid instruction with opcode {:#04x} was called at address {:#06x}",
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invalid_instruction.opcode, self.pc
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),
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});
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};
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println!("{:?}", george_error.desc);
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}
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},
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}
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}
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self.pending_cycles -= 1;
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self.cycle_count += 1;
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Ok(())
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}
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pub fn stop(&mut self) {
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BIN
src/george
BIN
src/george
Binary file not shown.
177
src/george.asm
177
src/george.asm
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@ -1,65 +1,27 @@
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.setcpu "65C02"
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.segment "CODE"
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.include "macro.inc"
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; okay so rn i wanna set up a very basic system init, and write a few subroutines to draw characters at x,y coordinates
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n = $01 ; temporary storage for data stack operations
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n = $01 ; temporary storage for data stack operations
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.macro breakpoint ; $02 isn't a valid instruction, the emulator will see this and halt, dump memory contents
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.byte $02
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.endmacro
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key_row = $200 ; used for character lookup when key pressed
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key_col = $201
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cursor = $202
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.macro pop ; drops a stack cell
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inx
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inx
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.endmacro
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kb_row0 = $4400 ; keyboard hardware register, there are 5 more but i can just increment from here
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.macro pop2 ; drops 2 data stack cells
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inx
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inx
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inx
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inx
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.endmacro
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.segment "ROM"
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.macro push ;
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dex
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dex
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.endmacro
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.macro push2 ;
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dex
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dex
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dex
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dex
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.endmacro
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.macro to_r ; pop the top of the stack off and save it in the return (hardware) stack: (n -- )
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lda 1, x
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pha
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lda 0, x
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pha
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pop
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.endmacro
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.macro from_r ; pop the top of the return stack off and put it on the data stack: ( -- n)
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push
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pla
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sta 0, x
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pla
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sta 1, x
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.endmacro
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init:
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reset:
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ldx #0; initialize data stack pointer
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jsr initdisplay
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main:
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jsr draw
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;lda #$80
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;sta $200
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;adc $200
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;breakpoint
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initdisplay:
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lda #$20
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ldy #0
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jsr cleardisplay
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rts
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cleardisplay:
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sta $6000,y
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@ -72,27 +34,104 @@ cleardisplay:
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sta $6700,y ; this goes slightly over but it's fine
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iny
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bne cleardisplay
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main:
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;jsr draw
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jsr keyboard
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jmp main
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keyboard:
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ldy #0 ; loop through each row
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@loop:
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lda kb_row0, y
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beq @skip ; if row has no key pressed, skip checking which key
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jsr key_pressed
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@skip:
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iny
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cpy #5
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bne @loop
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rts
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draw: ; draw a character at (20, 30)
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lda #63
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key_pressed: ; a is loaded with the row byte
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sty key_row ; store character row
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inc cursor
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pha
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phy
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ldy #0
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@find_col: ; test each row bit, store column if key pressed
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lsr ; test bit 7
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bcs store_col ; if set, go store character column
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iny
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cpy #8
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bne @find_col ; loop until we've checked each bit
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store_col:
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sty key_col
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keymap_index:
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push
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sta 0, x ; low byte
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stz 1,x ; high byte is zero
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lda #28
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lda key_col
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stz 1, x
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sta 0, x
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push
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sta 0,x ; same here
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stz 1,x
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lda #8
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stz 1, x
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sta 0, x
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push
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lda key_row
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stz 1, x
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sta 0, x
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jsr mult
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jsr plus
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lda 0, x
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tay
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do_something_w_key: ; we've stored the character position, now let's
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lda keymap, y
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ldy cursor
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sta $6000, y
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pla
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ply
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rts
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keymap:
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.byte "?outrew?"
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.byte "?piygsq?"
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.byte "a??khvd?"
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.byte "42ljbfz?"
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.byte "31?mncx?"
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.byte "?????ssm"
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draw:
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; lda #%01000000
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; bit $4400
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; beq @1
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; push_coords #0, #0
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; push_char #$77
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; jsr draw_char
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; @1:
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; lda #%00100000
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; bit $4400
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; beq @2
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; push_coords #0, #0
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; push_char #$65
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; jsr draw_char
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; @2:
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rts
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draw_char: ; draw a character c at (x, y) (n1: x n2: y n3: c -- )
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lda 0, x ; load a with character to draw
|
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pop ; and pop it off the stack
|
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jsr get_char_address ; calculate where to put the character in memory
|
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lda #4
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sta (0, x) ; store a at the address pointed to on the stack
|
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brk
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rts
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|
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get_char_address: ; gets vram address for a character at (x, y),
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; (n1: x n2: y -- n: $6000 + x + (64 * y))
|
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;jsr push_lit ; push 64 onto stack, low byte first
|
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;.byte 64
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;.byte 0
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pha
|
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lda #64
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push ; doing this instead until `push_lit` is fixed
|
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sta 0, x
|
||||
|
@ -109,18 +148,14 @@ get_char_address: ; gets vram address for a character at (x, y),
|
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stz 0, x
|
||||
jsr plus ; add vram start address to result
|
||||
|
||||
pla
|
||||
rts
|
||||
|
||||
fill: ; fills an area from (x1, y1) to (x2, y2) will character c, (n1: c n2: x1 n3: y1 n4: x2 n5: y2 -- )
|
||||
|
||||
; inc16
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||||
; add 1 to a 16-bit pointer in zero page
|
||||
|
||||
;inc16:
|
||||
; inc ptr
|
||||
; bne :+
|
||||
; inc ptr+1
|
||||
;: rts
|
||||
;
|
||||
jsr get_char_address
|
||||
|
||||
; --- Data Stack --- ;
|
||||
; on this channel we love garth wilson: https://wilsonminesco.com/stacks/StackOps.ASM
|
||||
; data stack is built up of 2-byte cells
|
||||
|
||||
|
@ -198,6 +233,8 @@ mult: ; multiply: (n1 n2 -- n1*n2), frankly, i don't know how this works, but TO
|
|||
pop
|
||||
ply
|
||||
rts
|
||||
|
||||
|
||||
.segment "VRAM"
|
||||
|
||||
.segment "VECTOR"
|
||||
.word reset
|
||||
|
||||
|
|
|
@ -1,12 +1,10 @@
|
|||
MEMORY {
|
||||
RAM: start = $0000, size = $0200, type = rw, fill = true;
|
||||
PROGRAM: start = $0200, size = $3E00, type = rw, fill = true;
|
||||
CTRL: start = $4000, size = $2000, type = rw, fill = true;
|
||||
VRAM: start = $6000, size = $8000, type = rw, fill = true;
|
||||
ROM: start = $E000, size = $2000, type = ro, fill = true;
|
||||
RAM: start = $0000, size = $8000, type = ro, fill = yes;
|
||||
ROM: start = $8000, size = $7FFC, type = ro, fill = yes;
|
||||
VECTOR: start = $FFFC, size = $4, type = ro, fill = yes;
|
||||
}
|
||||
|
||||
SEGMENTS {
|
||||
CODE: load = "PROGRAM", type = rw;
|
||||
VRAM: load = "VRAM", type = rw;
|
||||
ROM: load = "ROM", type = ro;
|
||||
VECTOR: load = "VECTOR", type = ro;
|
||||
}
|
||||
|
|
|
@ -7,10 +7,10 @@
|
|||
# column #2 is the Unicode (in hex as 0xXXXX)
|
||||
# column #3 the Unicode name (follows a comment sign, '#')
|
||||
|
||||
0x00 0x0295 # ʕ
|
||||
0x01 0x00B7 # Middle Dot
|
||||
0x02 0x1D25 # ᴥ
|
||||
0x03 0x0294 # ʔ
|
||||
0x00 0x00 #
|
||||
0x01 0x2591 #
|
||||
0x02 0x2592 # ᴥ
|
||||
0x03 0x2593 # ʔ
|
||||
0x04 0x2661 # White heart
|
||||
0x05 0x2665 # Black heart
|
||||
0x06 0x2B50 # White star
|
||||
|
@ -189,70 +189,70 @@
|
|||
0xB3 0x258D #
|
||||
0xB4 0x258E #
|
||||
0xB5 0x258F #
|
||||
0xB6 0x2591 #
|
||||
0xB7 0x2592 #
|
||||
0xB8 0x2593 #
|
||||
0xB9 0x2596 #
|
||||
0xBA 0x2597 #
|
||||
0xBB 0x2598 #
|
||||
0xBC 0x2599 #
|
||||
0xBD 0x259A #
|
||||
0xBE 0x259B #
|
||||
0xBF 0x259C #
|
||||
0xC0 0x259D #
|
||||
0xC1 0x259E #
|
||||
0xC2 0x259F #
|
||||
0xC3 0x2190 #
|
||||
0xC4 0x2191 #
|
||||
0xC5 0x2192 #
|
||||
0xC6 0x2193 #
|
||||
0xC7 0x2B60 #
|
||||
0xC8 0x2B61 #
|
||||
0xC9 0x2B62 #
|
||||
0xCA 0x2B63 #
|
||||
0xCB 0x2B80 #
|
||||
0xCC 0x2B81 #
|
||||
0xCD 0x2B82 #
|
||||
0xCE 0x2B83 #
|
||||
0xCF 0xF049 #
|
||||
0xD0 0xF04A #
|
||||
0xD1 0x23F3 #
|
||||
0xD2 0xF07B #
|
||||
0xD3 0xF07C #
|
||||
0xD4 0xF114 #
|
||||
0xD5 0xF115 #
|
||||
0xD6 0xF250 #
|
||||
0xD7 0xF251 #
|
||||
0xD8 0xF253 #
|
||||
0xD9 0xF254 #
|
||||
0xDA 0xF461 #
|
||||
0xDB 0xF016 #
|
||||
0xDC 0xF401 #
|
||||
0xDD 0x1F52E #
|
||||
0xDE 0xF2DB #
|
||||
0xDF 0xF008 #
|
||||
0xE0 0x25C7 #
|
||||
0xE1 0x25C8 #
|
||||
0xE2 0x1F311 #
|
||||
0xE3 0x1F312 #
|
||||
0xE4 0x1F313 #
|
||||
0xE5 0x1F314 #
|
||||
0xE6 0x1F315 #
|
||||
0xE7 0x1F316 #
|
||||
0xE8 0x1F317 #
|
||||
0xE9 0x1F318 #
|
||||
0xEA 0xF04C #
|
||||
0xEB 0x2714 #
|
||||
0xEC 0x2718 #
|
||||
0xED 0x25C6 #
|
||||
0xEE 0xF15D #
|
||||
0xEF 0xF15E #
|
||||
0xF0 0xF071 #
|
||||
0xF1 0xF449 #
|
||||
0xF2 0xF529 #
|
||||
0xF3 0xF658 #
|
||||
0xF4 0xF659 #
|
||||
0xF5 0x0020 #
|
||||
0xB6 0x0295 #
|
||||
0xB7 0x00B7 #
|
||||
0xB8 0x1D25 #
|
||||
0xB9 0x0294
|
||||
0xBA 0x2596
|
||||
0xBB 0x2597
|
||||
0xBC 0x2598
|
||||
0xBD 0x2599
|
||||
0xBE 0x259A
|
||||
0xBF 0x259B
|
||||
0xC0 0x259C
|
||||
0xC1 0x259D
|
||||
0xC2 0x259E
|
||||
0xC3 0x259F
|
||||
0xC4 0x2190
|
||||
0xC5 0x2191
|
||||
0xC6 0x2192
|
||||
0xC7 0x2193
|
||||
0xC8 0x2B60
|
||||
0xC9 0x2B61
|
||||
0xCA 0x2B62
|
||||
0xCB 0x2B63
|
||||
0xCC 0x2B80
|
||||
0xCD 0x2B81
|
||||
0xCE 0x2B82
|
||||
0xCF 0x2B83
|
||||
0xD0 0xF049
|
||||
0xD1 0xF04A
|
||||
0xD2 0x23F3
|
||||
0xD3 0xF07B
|
||||
0xD4 0xF07C
|
||||
0xD5 0xF114
|
||||
0xD6 0xF115
|
||||
0xD7 0xF250
|
||||
0xD8 0xF251
|
||||
0xD9 0xF253
|
||||
0xDA 0xF254
|
||||
0xDB 0xF461
|
||||
0xDC 0xF016
|
||||
0xDD 0xF401
|
||||
0xDE 0x1F52E
|
||||
0xDF 0xF2DB
|
||||
0xE0 0xF008
|
||||
0xE1 0x25C7
|
||||
0xE2 0x25C8
|
||||
0xE3 0x1F311
|
||||
0xE4 0x1F312
|
||||
0xE5 0x1F313
|
||||
0xE6 0x1F314
|
||||
0xE7 0x1F315
|
||||
0xE8 0x1F316
|
||||
0xE9 0x1F317
|
||||
0xEA 0x1F318
|
||||
0xEB 0xF04C
|
||||
0xEC 0x2714
|
||||
0xED 0x2718
|
||||
0xEE 0x25C6
|
||||
0xEF 0xF15D
|
||||
0xF0 0xF15E
|
||||
0xF1 0xF071
|
||||
0xF2 0xF449
|
||||
0xF3 0xF529
|
||||
0xF4 0xF658
|
||||
0xF5 0xF659 #
|
||||
0xF6 0x1f381 # Space
|
||||
0xF7 0xf05a # Space
|
||||
0xF8 0xf06a # Space
|
||||
|
|
|
@ -2063,6 +2063,7 @@ impl Opcode {
|
|||
let byte = cpu.read(address.try_into()?)?;
|
||||
let carry = cpu.get_flag(StatusFlag::Carry);
|
||||
let result = cpu.a as Word + byte as Word + carry as Word;
|
||||
println!("{result:#04x}");
|
||||
cpu.set_flag(StatusFlag::Carry, result > Word::from(u8::max_value()));
|
||||
cpu.set_flag(StatusFlag::Zero, result as Byte == 0);
|
||||
cpu.set_flag(
|
||||
|
@ -2073,6 +2074,7 @@ impl Opcode {
|
|||
);
|
||||
cpu.set_flag(StatusFlag::Negative, cpu.is_negative(result as Byte));
|
||||
cpu.a = result as Byte;
|
||||
println!("{:#04x}", cpu.a);
|
||||
Ok(())
|
||||
}
|
||||
_ => Err(GeorgeErrorKind::AddrMode(
|
||||
|
@ -2103,10 +2105,7 @@ impl Opcode {
|
|||
fn asl(cpu: &mut Cpu, value: Byte) -> Byte {
|
||||
cpu.set_flag(StatusFlag::Carry, value & 0b1000_0000 == 0b1000_0000);
|
||||
let shifted_value = value << 1;
|
||||
cpu.set_flag(
|
||||
StatusFlag::Negative,
|
||||
value & StatusFlag::Negative as Byte > 0,
|
||||
);
|
||||
cpu.set_flag(StatusFlag::Negative, cpu.is_negative(shifted_value));
|
||||
cpu.set_flag(StatusFlag::Zero, shifted_value == 0);
|
||||
shifted_value
|
||||
}
|
||||
|
@ -2532,7 +2531,8 @@ impl Opcode {
|
|||
Opcode::BRK(mode) => match mode {
|
||||
AddressingMode::Implied => {
|
||||
cpu.set_flag(StatusFlag::Brk, true);
|
||||
panic!("Interrupts unimplemented!");
|
||||
Ok(())
|
||||
//panic!("Interrupts unimplemented!");
|
||||
}
|
||||
_ => Err(GeorgeErrorKind::AddrMode(
|
||||
AddressingModeError::IncompatibleAddrMode,
|
||||
|
@ -2662,6 +2662,8 @@ impl Opcode {
|
|||
Opcode::DEX(mode) => match mode {
|
||||
AddressingMode::Implied => {
|
||||
cpu.x = cpu.x.wrapping_sub(1);
|
||||
cpu.set_flag(StatusFlag::Zero, cpu.x == 0);
|
||||
cpu.set_flag(StatusFlag::Negative, cpu.is_negative(cpu.x));
|
||||
Ok(())
|
||||
}
|
||||
_ => Err(GeorgeErrorKind::AddrMode(
|
||||
|
@ -2670,7 +2672,9 @@ impl Opcode {
|
|||
},
|
||||
Opcode::DEY(mode) => match mode {
|
||||
AddressingMode::Implied => {
|
||||
cpu.y -= 1;
|
||||
cpu.y = cpu.y.wrapping_sub(1);
|
||||
cpu.set_flag(StatusFlag::Zero, cpu.y == 0);
|
||||
cpu.set_flag(StatusFlag::Negative, cpu.is_negative(cpu.y));
|
||||
Ok(())
|
||||
}
|
||||
_ => Err(GeorgeErrorKind::AddrMode(
|
||||
|
@ -2824,11 +2828,8 @@ impl Opcode {
|
|||
fn lsr(cpu: &mut Cpu, value: Byte) -> Byte {
|
||||
cpu.set_flag(StatusFlag::Carry, value & 1 == 1);
|
||||
let shifted_value = value >> 1;
|
||||
cpu.set_flag(
|
||||
StatusFlag::Negative,
|
||||
value & StatusFlag::Negative as Byte > 0,
|
||||
);
|
||||
cpu.set_flag(StatusFlag::Zero, shifted_value == 0);
|
||||
cpu.set_flag(StatusFlag::Negative, cpu.is_negative(value));
|
||||
shifted_value
|
||||
}
|
||||
match mode {
|
||||
|
@ -3048,10 +3049,7 @@ impl Opcode {
|
|||
let carry = cpu.get_flag(StatusFlag::Carry) as Byte;
|
||||
cpu.set_flag(StatusFlag::Carry, value >> 7 == 1);
|
||||
let shifted_value = (value << 1) + carry;
|
||||
cpu.set_flag(
|
||||
StatusFlag::Negative,
|
||||
shifted_value & StatusFlag::Negative as Byte > 0,
|
||||
);
|
||||
cpu.set_flag(StatusFlag::Negative, cpu.is_negative(shifted_value));
|
||||
cpu.set_flag(StatusFlag::Zero, shifted_value == 0);
|
||||
shifted_value
|
||||
}
|
||||
|
@ -3080,10 +3078,7 @@ impl Opcode {
|
|||
let carry = cpu.get_flag(StatusFlag::Carry) as Byte;
|
||||
cpu.set_flag(StatusFlag::Carry, value & 1 == 1);
|
||||
let shifted_value = (value >> 1) + (carry << 7);
|
||||
cpu.set_flag(
|
||||
StatusFlag::Negative,
|
||||
shifted_value & StatusFlag::Negative as Byte > 0,
|
||||
);
|
||||
cpu.set_flag(StatusFlag::Negative, cpu.is_negative(shifted_value));
|
||||
cpu.set_flag(StatusFlag::Zero, shifted_value == 0);
|
||||
shifted_value
|
||||
}
|
||||
|
|
40
src/main.rs
40
src/main.rs
|
@ -3,35 +3,23 @@
|
|||
mod cpu;
|
||||
mod error;
|
||||
mod instructions;
|
||||
mod keyboard;
|
||||
mod memory;
|
||||
mod types;
|
||||
mod video;
|
||||
|
||||
use crate::cpu::Cpu;
|
||||
use crate::memory::{Mem, MemMappedDevice};
|
||||
use crate::memory::Mem;
|
||||
use crate::video::Crtc;
|
||||
|
||||
use std::{
|
||||
path::PathBuf,
|
||||
sync::{Arc, RwLock},
|
||||
thread,
|
||||
};
|
||||
use std::str::FromStr;
|
||||
use std::sync::Mutex;
|
||||
use std::thread::sleep;
|
||||
use std::time::Duration;
|
||||
use std::{path::PathBuf, sync::Arc, thread};
|
||||
|
||||
fn main() {
|
||||
let ram = MemMappedDevice::new(0x0000, 0x3FFF, 2, "ram".into());
|
||||
let control = MemMappedDevice::new(0x4000, 0x5FFF, 4, "control".into());
|
||||
let vram = MemMappedDevice::new(0x6000, 0xDFFF, 1, "vram".into());
|
||||
let rom = MemMappedDevice::new(0xE000, 0xFFFF, 4, "rom".into());
|
||||
let mut memory = Mem::new(ram);
|
||||
if let Err(error) = memory.add_area(control) {
|
||||
println!("Error adding vram: {:?}", error.desc);
|
||||
};
|
||||
if let Err(error) = memory.add_area(vram) {
|
||||
println!("Error adding vram: {:?}", error.desc);
|
||||
};
|
||||
if let Err(error) = memory.add_area(rom) {
|
||||
println!("Error adding rom: {:?}", error.desc);
|
||||
};
|
||||
let mut memory = Mem::new();
|
||||
let binary = match std::fs::File::open(PathBuf::from(
|
||||
"/Users/kline/projects/winter/george-emu/src/george",
|
||||
)) {
|
||||
|
@ -41,20 +29,20 @@ fn main() {
|
|||
if let Err(error) = memory.read_from_bin(binary) {
|
||||
println!("{:?}", error);
|
||||
};
|
||||
memory.write(0xFFFC, 0x00).unwrap();
|
||||
memory.write(0xFFFD, 0x02).unwrap();
|
||||
|
||||
let shared_memory = Arc::new(RwLock::new(memory));
|
||||
memory
|
||||
.dump(PathBuf::from_str("./coredump.bin").unwrap())
|
||||
.unwrap();
|
||||
|
||||
let shared_memory = Arc::new(Mutex::new(memory));
|
||||
let cpu_memory = shared_memory.clone();
|
||||
let display_memory = shared_memory.clone();
|
||||
|
||||
let mut screen = Crtc::new(display_memory);
|
||||
|
||||
thread::spawn(move || {
|
||||
let mut cpu = Cpu::new(cpu_memory);
|
||||
cpu.reset().unwrap();
|
||||
cpu.execute();
|
||||
});
|
||||
let mut screen = Crtc::new(display_memory);
|
||||
screen.run();
|
||||
shared_memory.write().unwrap().dump().unwrap();
|
||||
}
|
||||
|
|
122
src/memory.rs
122
src/memory.rs
|
@ -1,124 +1,44 @@
|
|||
use crate::error::{GeorgeError, GeorgeErrorKind, MappingError, MemoryError};
|
||||
use crate::error::MemoryError;
|
||||
use crate::types::{Byte, Word};
|
||||
use std::io::{self, Write};
|
||||
use std::path::PathBuf;
|
||||
use std::u16;
|
||||
use std::{fs::File, io::Read};
|
||||
|
||||
#[derive(Debug, Clone)]
|
||||
pub struct MemMappedDevice {
|
||||
start: Word,
|
||||
end: Word,
|
||||
pages: usize,
|
||||
page: usize,
|
||||
data: Vec<Byte>,
|
||||
label: String,
|
||||
}
|
||||
|
||||
impl MemMappedDevice {
|
||||
pub fn new(start: Word, end: Word, pages: usize, label: String) -> Self {
|
||||
Self {
|
||||
start,
|
||||
end,
|
||||
pages,
|
||||
page: 0,
|
||||
data: vec![0x00; (end as usize + 1 - start as usize) * pages],
|
||||
label,
|
||||
}
|
||||
}
|
||||
fn contains(&self, address: Word) -> bool {
|
||||
self.start <= address && self.end >= address
|
||||
}
|
||||
fn swap_page(&mut self, page: usize) -> Result<(), GeorgeError> {
|
||||
match page > self.pages {
|
||||
true => Err(GeorgeError {
|
||||
kind: GeorgeErrorKind::Memory(MemoryError::Unmapped), //TODO: should be MappingError::InvalidPage,
|
||||
desc: format!(
|
||||
"{:?} tried to swap to a page outside of its range",
|
||||
self.label
|
||||
),
|
||||
}),
|
||||
false => {
|
||||
self.page = page;
|
||||
Ok(())
|
||||
}
|
||||
}
|
||||
}
|
||||
fn size(&self) -> Word {
|
||||
self.end - self.start + 1
|
||||
}
|
||||
fn translate_address(&self, address: Word) -> Word {
|
||||
(address - self.start) + self.size() * (self.page as Word)
|
||||
} // This needs to translate memory address from CPU land to local land, so
|
||||
// for rom an address like 0xFFFF needs to be translated to Page X, 0xFFF
|
||||
}
|
||||
|
||||
#[derive(Debug, Clone)]
|
||||
pub struct Mem {
|
||||
areas: Vec<MemMappedDevice>,
|
||||
pub data: Vec<Byte>,
|
||||
}
|
||||
|
||||
impl Mem {
|
||||
pub fn new(area: MemMappedDevice) -> Self {
|
||||
Self { areas: vec![area] }
|
||||
}
|
||||
pub fn dump(&self) -> io::Result<()> {
|
||||
let mut outfile = File::create("./coredump.bin")?;
|
||||
let mut data = Vec::new();
|
||||
for area in &self.areas {
|
||||
for byte in &area.data {
|
||||
data.push(byte.to_owned());
|
||||
}
|
||||
pub fn new() -> Self {
|
||||
Self {
|
||||
data: vec![0; u16::MAX as usize + 1],
|
||||
}
|
||||
outfile.set_len(0xFFFF)?;
|
||||
outfile.write_all(&data)?;
|
||||
}
|
||||
pub fn dump(&self, path: PathBuf) -> io::Result<()> {
|
||||
let mut outfile = File::create(path)?;
|
||||
outfile.write_all(&self.data)?;
|
||||
Ok(())
|
||||
}
|
||||
pub fn add_area(&mut self, area: MemMappedDevice) -> Result<(), GeorgeError> {
|
||||
for existing_area in &self.areas {
|
||||
if existing_area.contains(area.end) || existing_area.contains(area.start) {
|
||||
return Err(GeorgeError {
|
||||
desc: format!(
|
||||
"Tried to assign an area already allocated to {:?}",
|
||||
existing_area
|
||||
),
|
||||
kind: GeorgeErrorKind::Mapping(MappingError::RegionOccupied),
|
||||
});
|
||||
}
|
||||
}
|
||||
self.areas.push(area);
|
||||
Ok(())
|
||||
}
|
||||
pub fn read(&self, address: Word) -> Result<Byte, MemoryError> {
|
||||
for area in &self.areas {
|
||||
if area.contains(address) {
|
||||
let translated_address = area.translate_address(address);
|
||||
match area.data.get(translated_address as usize) {
|
||||
Some(data) => return Ok(*data),
|
||||
None => return Err(MemoryError::NoDataAtAddress),
|
||||
}
|
||||
}
|
||||
}
|
||||
Err(MemoryError::Unmapped)
|
||||
}
|
||||
|
||||
pub fn write(&mut self, address: Word, data: Byte) -> Result<(), MemoryError> {
|
||||
for area in self.areas.iter_mut() {
|
||||
if area.contains(address) {
|
||||
// println!("Writing to area {label}", label = area.label);
|
||||
let translated_address = area.translate_address(address);
|
||||
area.data[translated_address as usize] = data;
|
||||
return Ok(());
|
||||
};
|
||||
}
|
||||
Err(MemoryError::Unmapped)
|
||||
pub fn read(&self, address: Word) -> Byte {
|
||||
self.data[address as usize]
|
||||
}
|
||||
|
||||
pub fn write(&mut self, address: Word, data: Byte) {
|
||||
self.data[address as usize] = data;
|
||||
}
|
||||
|
||||
pub fn read_from_bin(&mut self, f: File) -> Result<(), MemoryError> {
|
||||
let bytes = f.bytes();
|
||||
for (address, byte) in bytes.enumerate() {
|
||||
match byte {
|
||||
Ok(value) => self.write(address as Word, value)?,
|
||||
Err(_) => return Err(MemoryError::Unwritable),
|
||||
Ok(value) => self.write(address as Word, value),
|
||||
Err(_) => {
|
||||
println!("couldn't write byte {:#04x}", address);
|
||||
return Err(MemoryError::Unwritable);
|
||||
}
|
||||
}
|
||||
}
|
||||
Ok(())
|
||||
|
|
173
src/video.rs
173
src/video.rs
|
@ -3,7 +3,7 @@ use minifb::{Key, Scale, ScaleMode, Window, WindowOptions};
|
|||
use std::{
|
||||
fs::File,
|
||||
io::Read,
|
||||
sync::{Arc, RwLock},
|
||||
sync::{Arc, Mutex},
|
||||
thread::sleep,
|
||||
time::{Duration, Instant},
|
||||
};
|
||||
|
@ -12,7 +12,7 @@ const FG_COLOR: u32 = 0xFFCC00;
|
|||
const BG_COLOR: u32 = 0x110500;
|
||||
|
||||
pub struct Crtc {
|
||||
memory: Arc<RwLock<Mem>>,
|
||||
memory: Arc<Mutex<Mem>>,
|
||||
buffer: Vec<u32>,
|
||||
window: minifb::Window,
|
||||
char_rom: Vec<u8>,
|
||||
|
@ -26,7 +26,7 @@ pub fn get_char_bin(path: &str) -> Vec<u8> {
|
|||
}
|
||||
|
||||
impl Crtc {
|
||||
pub fn new(memory: Arc<RwLock<Mem>>) -> Self {
|
||||
pub fn new(memory: Arc<Mutex<Mem>>) -> Self {
|
||||
let window = Window::new(
|
||||
"ʕ·ᴥ·ʔ-☆",
|
||||
512,
|
||||
|
@ -52,82 +52,127 @@ impl Crtc {
|
|||
}
|
||||
}
|
||||
fn draw(&mut self) {
|
||||
match &mut self.memory.clone().try_read() {
|
||||
Ok(memory) => {
|
||||
let hw_ctrl = memory.read(0x4000).unwrap();
|
||||
match hw_ctrl & 0b0000_1000 == 0b0000_1000 {
|
||||
false => self.draw_chars(),
|
||||
true => self.draw_hires(),
|
||||
};
|
||||
}
|
||||
let memory = match self.memory.lock() {
|
||||
Ok(memory) => memory,
|
||||
Err(_) => {
|
||||
println!("Couldn't acquire read on shared memory in main thread");
|
||||
println!("Couldn't acquire read on shared memory in video thread");
|
||||
return;
|
||||
}
|
||||
};
|
||||
let hw_ctrl = memory.read(0x4000);
|
||||
match hw_ctrl & 0b0000_1000 == 0b0000_1000 {
|
||||
false => {
|
||||
// the rest of this function is arcane wizardry based on the specifics of george's weird
|
||||
// display and characters... don't fuck around w it
|
||||
let mut i = 0;
|
||||
for char_row in 0..29 {
|
||||
for char_col in 0..64 {
|
||||
let ascii = memory.read(0x6000 + i);
|
||||
i += 1;
|
||||
for row in 0..13 {
|
||||
let byte = self.char_rom[ascii as usize + (row * 0x101)];
|
||||
for i in (0..8).rev() {
|
||||
let buffer_index =
|
||||
((char_row) * 13 + (row)) * 512 + (char_col * 8 + i);
|
||||
if (byte << i) & 0x80 == 0x80 {
|
||||
self.buffer[buffer_index] = FG_COLOR;
|
||||
} else {
|
||||
self.buffer[buffer_index] = BG_COLOR;
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
true => {
|
||||
for addr in 0x6000..0xBF00 {
|
||||
// TODO: eventually this will access memory in the weird interleaved way the hardware is
|
||||
// designed, but this is easiest to implement for now
|
||||
let byte = memory.read(addr);
|
||||
for i in 0..8 {
|
||||
match byte & 0x80 >> i == 0 {
|
||||
true => self.buffer[(addr - 0x6000) as usize * 8 + i] = BG_COLOR,
|
||||
false => self.buffer[(addr - 0x6000) as usize * 8 + i] = FG_COLOR,
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
};
|
||||
|
||||
self.window
|
||||
.update_with_buffer(&self.buffer, 512, 380)
|
||||
.unwrap();
|
||||
}
|
||||
|
||||
fn draw_chars(&mut self) {
|
||||
let memory = match self.memory.try_read() {
|
||||
Ok(read) => read,
|
||||
Err(_) => {
|
||||
println!("Couldn't acquire read on shared memory in main thread");
|
||||
return;
|
||||
}
|
||||
};
|
||||
|
||||
// the rest of this function is arcane wizardry based on the specifics of george's weird
|
||||
// display and characters... don't fuck around w it
|
||||
let mut i = 0;
|
||||
for char_row in 0..29 {
|
||||
for char_col in 0..64 {
|
||||
let ascii = memory.read(0x6000 + i).unwrap();
|
||||
i += 1;
|
||||
for row in 0..13 {
|
||||
let byte = self.char_rom[ascii as usize + (row * 0x101)];
|
||||
for i in (0..8).rev() {
|
||||
let buffer_index = ((char_row) * 13 + (row)) * 512 + (char_col * 8 + i);
|
||||
if (byte << i) & 0x80 == 0x80 {
|
||||
self.buffer[buffer_index] = FG_COLOR;
|
||||
} else {
|
||||
self.buffer[buffer_index] = BG_COLOR;
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
fn draw_hires(&mut self) {
|
||||
let memory = match self.memory.try_read() {
|
||||
Ok(read) => read,
|
||||
Err(_) => {
|
||||
println!("Couldn't acquire read on shared memory in main thread");
|
||||
return;
|
||||
}
|
||||
};
|
||||
for addr in 0x6000..0xBF00 {
|
||||
// TODO: eventually this will access memory in the weird interleaved way the hardware is
|
||||
// designed, but this is easiest to implement for now
|
||||
let byte = memory.read(addr).unwrap();
|
||||
for i in 0..8 {
|
||||
match byte & 0x80 >> i == 0 {
|
||||
true => self.buffer[(addr - 0x6000) as usize * 8 + i] = BG_COLOR,
|
||||
false => self.buffer[(addr - 0x6000) as usize * 8 + i] = FG_COLOR,
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
pub fn run(&mut self) {
|
||||
let frame_duration = Duration::from_millis(16);
|
||||
let mut previous_draw = Instant::now();
|
||||
|
||||
loop {
|
||||
if self.window.is_key_down(Key::Q) {
|
||||
return;
|
||||
let mut row0 = 0;
|
||||
let mut row1 = 0;
|
||||
let mut row2 = 0;
|
||||
let mut row3 = 0;
|
||||
let mut row4 = 0;
|
||||
let mut row5 = 0;
|
||||
|
||||
self.window.get_keys().iter().for_each(|key| match key {
|
||||
Key::Escape => row0 ^= 0b1000_0000,
|
||||
Key::W => row0 ^= 0b0100_0000,
|
||||
Key::E => row0 ^= 0b0010_0000,
|
||||
Key::R => row0 ^= 0b0001_0000,
|
||||
Key::T => row0 ^= 0b0000_1000,
|
||||
Key::U => row0 ^= 0b0000_0100,
|
||||
Key::O => row0 ^= 0b0000_0010,
|
||||
Key::Backspace => row0 ^= 0b0000_0001,
|
||||
Key::Tab => row1 ^= 0b1000_0000,
|
||||
Key::Q => row1 ^= 0b0100_0000,
|
||||
Key::S => row1 ^= 0b0010_0000,
|
||||
Key::G => row1 ^= 0b0001_0000,
|
||||
Key::Y => row1 ^= 0b0000_1000,
|
||||
Key::I => row1 ^= 0b0000_0100,
|
||||
Key::P => row1 ^= 0b0000_0010,
|
||||
Key::Enter => row1 ^= 0b0000_0001,
|
||||
Key::LeftShift | Key::RightShift => row2 ^= 0b1000_0000,
|
||||
Key::D => row2 ^= 0b0100_0000,
|
||||
Key::V => row2 ^= 0b0010_0000,
|
||||
Key::H => row2 ^= 0b0001_0000,
|
||||
Key::K => row2 ^= 0b0000_1000,
|
||||
Key::Apostrophe => row2 ^= 0b0000_0100,
|
||||
Key::Slash => row2 ^= 0b0000_0010,
|
||||
Key::A => row2 ^= 0b0000_0001,
|
||||
Key::LeftCtrl | Key::RightCtrl => row3 ^= 0b1000_0000,
|
||||
Key::Z => row3 ^= 0b0100_0000,
|
||||
Key::F => row3 ^= 0b0010_0000,
|
||||
Key::B => row3 ^= 0b0001_0000,
|
||||
Key::J => row3 ^= 0b0000_1000,
|
||||
Key::L => row3 ^= 0b0000_0100,
|
||||
Key::Key2 => row3 ^= 0b0000_0010,
|
||||
Key::Key4 => row3 ^= 0b0000_0001,
|
||||
Key::LeftAlt | Key::RightAlt => row4 ^= 0b1000_0000,
|
||||
Key::X => row4 ^= 0b0100_0000,
|
||||
Key::C => row4 ^= 0b0010_0000,
|
||||
Key::N => row4 ^= 0b0001_0000,
|
||||
Key::M => row4 ^= 0b0000_1000,
|
||||
Key::Comma => row4 ^= 0b0000_0100,
|
||||
Key::Key1 => row4 ^= 0b0000_0010,
|
||||
Key::Key3 => row4 ^= 0b0000_0001,
|
||||
Key::LeftSuper => row5 ^= 0b1000_0000,
|
||||
Key::Space => row5 ^= 0b0100_0000,
|
||||
Key::RightSuper => row5 ^= 0b0010_0000,
|
||||
_ => {}
|
||||
});
|
||||
|
||||
match &mut self.memory.lock() {
|
||||
Ok(memory) => {
|
||||
memory.write(0x4400, row0);
|
||||
memory.write(0x4401, row1);
|
||||
memory.write(0x4402, row2);
|
||||
memory.write(0x4403, row3);
|
||||
memory.write(0x4404, row4);
|
||||
memory.write(0x4405, row5);
|
||||
}
|
||||
Err(error) => println!("{error}"),
|
||||
}
|
||||
let now = Instant::now();
|
||||
if now - previous_draw > frame_duration {
|
||||
|
|
Loading…
Reference in New Issue