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adjustable memory size

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This commit is contained in:
Lea 2023-01-25 19:33:56 +01:00
parent 1f98c57eb0
commit 14d04d32ee
Signed by: Lea
GPG key ID: 1BAFFE8347019C42
1 changed files with 10 additions and 5 deletions
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15
src/emulator/main.rs
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@ -3,6 +3,8 @@ use instructions::arithmetic;
mod instructions; mod instructions;
const MEMORY_SIZE: usize = 8192;
pub struct EmulatorState { pub struct EmulatorState {
a: u8, a: u8,
b: u8, b: u8,
@ -21,7 +23,7 @@ pub struct EmulatorState {
/// Enable interrupts /// Enable interrupts
ei: bool, ei: bool,
/// Memory map /// Memory map
memory: [u8; 8000], memory: [u8; MEMORY_SIZE],
} }
pub struct ConditionCodes { pub struct ConditionCodes {
@ -117,7 +119,7 @@ fn main() {
cc: ConditionCodes { z: true, s: true, p: true, c: true }, cc: ConditionCodes { z: true, s: true, p: true, c: true },
pc: 0, pc: 0,
ei: true, ei: true,
memory: [0; 8000], memory: [0; MEMORY_SIZE],
}; };
// Load the ROM into memory // Load the ROM into memory
@ -127,13 +129,16 @@ fn main() {
.expect("Provide a path to a ROM file to emulate as an argument"); .expect("Provide a path to a ROM file to emulate as an argument");
let file = fs::read(filename).expect("where file"); let file = fs::read(filename).expect("where file");
for i in 0..8000 { for i in 0..8192 {
state.memory[i] = file[i]; state.memory[i] = file[i];
} }
while state.pc < 8000 { while state.pc < 8192 {
tick(&mut state); tick(&mut state);
} }
println!("Program counter reached end of memory; exiting");
print_state(&state);
} }
fn tick(state: &mut EmulatorState) { fn tick(state: &mut EmulatorState) {
@ -145,7 +150,7 @@ fn tick(state: &mut EmulatorState) {
}; };
match instruction { match instruction {
0x00 => {} // NOP 0x00 => {} // NOP
/* ADD */ /* ADD */