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Add default character set

This commit is contained in:
Michael Kohl 2021-04-01 22:55:45 +07:00
parent c65f7f7ebe
commit 2060c01fd9
1 changed files with 41 additions and 4 deletions
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45
src/chip8.rs
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@ -79,9 +79,38 @@ fn data_register_to_index(register: Register) -> usize {
}
}
const DEFAULT_CHARACTER_SET: &[u8] = &[
0xf0, 0x90, 0x90, 0x90, 0xf0, // 0
0x20, 0x60, 0x20, 0x20, 0x70, // 1
0xf0, 0x10, 0xf0, 0x80, 0xf0, // 2
0xf0, 0x10, 0xf0, 0x10, 0xf0, // 3
0x90, 0x90, 0xf0, 0x10, 0x10, // 4
0xf0, 0x80, 0xf0, 0x10, 0xf0, // 5
0xf0, 0x80, 0xf0, 0x90, 0xf0, // 6
0xf0, 0x10, 0x20, 0x40, 0x40, // 7
0xf0, 0x90, 0xf0, 0x90, 0xf0, // 8
0xf0, 0x90, 0xf0, 0x10, 0xf0, // 9
0xf0, 0x90, 0xf0, 0x90, 0x90, // A
0xe0, 0x90, 0xe0, 0x90, 0xe0, // B
0xf0, 0x80, 0x80, 0x80, 0xf0, // C
0xe0, 0x90, 0x90, 0x90, 0xe0, // D
0xf0, 0x80, 0xf0, 0x80, 0xf0, // E
0xf0, 0x80, 0xf0, 0x80, 0x80, // F
];
const DEFAULT_CHARACTER_SET_START: usize = 0;
fn copy_default_char_set(destination: &mut Chip8) {
let mut index = DEFAULT_CHARACTER_SET_START;
for byte in DEFAULT_CHARACTER_SET.iter() {
destination.memory_set(index, *byte);
index += 1;
}
}
impl Chip8 {
pub fn new() -> Chip8 {
Chip8 {
let mut chip8 = Chip8 {
memory: [0; MEMORY_SIZE],
registers: Registers {
data: [0; DATA_REGISTERS],
@ -93,7 +122,9 @@ impl Chip8 {
},
stack: [0; STACK_DEPTH],
keyboard: [false; KEYS],
}
};
copy_default_char_set(&mut chip8);
chip8
}
pub fn memory_set(&mut self, index: usize, value: u8) -> () {
@ -186,8 +217,8 @@ mod tests {
#[test]
fn it_can_write_the_memory() {
let mut chip8 = Chip8::new();
chip8.memory_set(2, 42);
assert_eq!(chip8.memory[0..3], [0, 0, 42]);
chip8.memory_set(200, 42);
assert_eq!(chip8.memory[200..=202], [42, 0, 0]);
}
#[test]
@ -260,4 +291,10 @@ mod tests {
chip8.key_up(1);
assert!(!chip8.is_key_down(1));
}
#[test]
fn it_has_a_default_character_set() {
let mut chip8 = Chip8::new();
assert_eq!(chip8.memory[0..5], [0xf0, 0x90, 0x90, 0x90, 0xf0])
}
}