53 lines
1.3 KiB
Rust
53 lines
1.3 KiB
Rust
use crate::bus::BusIo;
|
|
|
|
const WORK_RAM_SIZE: usize = 0x1000;
|
|
const VARIABLE_WORK_RAM_SIZE: usize = WORK_RAM_SIZE;
|
|
const WORK_RAM_START_ADDRESS: usize = 0xC000;
|
|
const VARIABLE_WORK_RAM_START_ADDRESS: usize = 0xD000;
|
|
|
|
#[derive(Debug)]
|
|
pub(crate) struct WorkRam {
|
|
bank: Box<[u8; WORK_RAM_SIZE]>,
|
|
}
|
|
|
|
impl BusIo for WorkRam {
|
|
fn write_byte(&mut self, addr: u16, byte: u8) {
|
|
self.bank[addr as usize - WORK_RAM_START_ADDRESS] = byte;
|
|
}
|
|
|
|
fn read_byte(&self, addr: u16) -> u8 {
|
|
self.bank[addr as usize - WORK_RAM_START_ADDRESS]
|
|
}
|
|
}
|
|
|
|
impl Default for WorkRam {
|
|
fn default() -> Self {
|
|
Self {
|
|
bank: Box::new([0u8; WORK_RAM_SIZE]),
|
|
}
|
|
}
|
|
}
|
|
|
|
#[derive(Debug)]
|
|
pub(crate) struct VariableWorkRam {
|
|
buf: Box<[u8; VARIABLE_WORK_RAM_SIZE]>, // 4K for Variable amount of Banks (Banks 1 -> 7) in Game Boy Colour
|
|
}
|
|
|
|
impl Default for VariableWorkRam {
|
|
fn default() -> Self {
|
|
Self {
|
|
buf: Box::new([0u8; VARIABLE_WORK_RAM_SIZE]),
|
|
}
|
|
}
|
|
}
|
|
|
|
impl BusIo for VariableWorkRam {
|
|
fn write_byte(&mut self, addr: u16, byte: u8) {
|
|
self.buf[addr as usize - VARIABLE_WORK_RAM_START_ADDRESS] = byte;
|
|
}
|
|
|
|
fn read_byte(&self, addr: u16) -> u8 {
|
|
self.buf[addr as usize - VARIABLE_WORK_RAM_START_ADDRESS]
|
|
}
|
|
}
|