FranLMSP/rmg-001
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Some ROM changes

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This commit is contained in:
Franco Colmenarez 2021-11-05 19:08:51 -05:00
parent 2bd74eddb4
commit d94b912ff6
2 changed files with 28 additions and 9 deletions
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5
src/bus.rs
View File

@ -57,10 +57,11 @@ pub struct Bus {
impl Bus {
pub fn new() -> Self {
// let game_rom = match ROM::load_file("ignore/mooneye/acceptance/if_ie_registers.gb".to_string()) {
let game_rom = match ROM::load_file("ignore/dr-mario.gb".to_string()) {
// let game_rom = match ROM::load_file("ignore/mooneye/emulator-only/mbc1/bits_bank1.gb".to_string()) {
// let game_rom = match ROM::load_file("roms/cpu_instrs.gb".to_string()) {
// let game_rom = match ROM::load_file("roms/cpu_instrs_individual/01-special.gb".to_string()) {
let game_rom = match ROM::load_file("roms/cpu_instrs_individual/02-interrupts.gb".to_string()) {
// let game_rom = match ROM::load_file("roms/cpu_instrs_individual/02-interrupts.gb".to_string()) {
// let game_rom = match ROM::load_file("roms/cpu_instrs_individual/03-op sp,hl.gb".to_string()) {
// let game_rom = match ROM::load_file("roms/cpu_instrs_individual/04-op r,imm.gb".to_string()) {
// let game_rom = match ROM::load_file("roms/cpu_instrs_individual/05-op rp.gb".to_string()) {

32
src/rom.rs
View File

@ -158,6 +158,7 @@ impl ROM {
file.read_to_end(&mut data)?;
let info = ROMInfo::from_bytes(&data);
println!("has ram {}", info.has_ram);
let ram = Vec::with_capacity(info.ram_size() as usize);
Ok(Self {
@ -175,9 +176,13 @@ impl ROM {
match self.info.mbc {
MBC::MBC1 => {
if BANK_SWITCHABLE.in_range(address) {
return self.data[(address + (BANK_SWITCHABLE.begin() * (self.rom_bank - 1))) as usize]
return self.data[(address + (BANK_SWITCHABLE.begin() * (self.rom_bank - 1))) as usize];
} else if EXTERNAL_RAM.in_range(address) {
return self.ram[(address - EXTERNAL_RAM.begin() + (EXTERNAL_RAM.begin() * self.ram_bank as u16)) as usize]
println!("RAM read");
if !self.info.has_ram {
return 0xFF;
}
return self.ram[(address - EXTERNAL_RAM.begin() + (EXTERNAL_RAM.begin() * self.ram_bank as u16)) as usize];
}
},
_ => {},
@ -196,20 +201,33 @@ impl ROM {
};
return;
} else if address >= 0x2000 || address <= 0x3FFF { // ROM bank number register
self.rom_bank = data as u16 & 0b00011111;
if self.rom_bank > self.info.rom_banks.saturating_sub(1) {
self.rom_bank = self.info.rom_banks.saturating_sub(1);
}
println!("Switch bank to {:02X}", data);
self.switch_rom_bank(data as u16 & 0b00011111);
} else if address >= 0x4000 || address <= 0x5FFF { // ROM and RAM bank number register
println!("RAM bank {:02X}", data);
self.ram_bank = data & 0b11;
} else if address >= 0x6000 || address <= 0x7FFF { // Banking mode select
println!("Change banking mode");
} else if EXTERNAL_RAM.in_range(address) {
if !self.ram_enable {
if !self.ram_enable || !self.info.has_ram {
return;
}
let address = (address - EXTERNAL_RAM.begin() + (EXTERNAL_RAM.begin() * self.ram_bank as u16)) as usize;
self.ram[address] = data;
self.switch_rom_bank(self.rom_bank + (data as u16 >> 5));
}
},
_ => {},
}
}
pub fn switch_rom_bank(&mut self, bank: u16) {
self.rom_bank = bank;
if self.rom_bank > self.info.rom_banks.saturating_sub(1) {
self.rom_bank = self.info.rom_banks.saturating_sub(1);
}
if self.rom_bank == 0 {
self.rom_bank = 1;
}
}
}