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Experimental interrupts

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This commit is contained in:
Franco Colmenarez
2021-10-29 15:40:47 -05:00
parent f90900a4c1
commit c77bc9db70
4 changed files with 114 additions and 54 deletions
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src/bus.rs
+45 -11
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@@ -6,7 +6,7 @@ use crate::utils::{
};
use crate::rom::ROM;
use crate::ppu::{PPU, LCDStatus, LCDStatusModeFlag};
use crate::cpu::{InterruptFlag};
use crate::cpu::{Interrupt};
pub struct AddressRange {
begin: u16,
@@ -39,6 +39,7 @@ pub const NOT_USABLE: AddressRange = AddressRange{begin: 0xFEA0,
pub const IO_REGISTERS: AddressRange = AddressRange{begin: 0xFF00, end: 0xFF7F};
pub const HIGH_RAM: AddressRange = AddressRange{begin: 0xFF80, end: 0xFFFE};
pub const INTERRUPT_ENABLE_REGISTER: AddressRange = AddressRange{begin: 0xFFFF, end: 0xFFFF};
pub const INTERRUPT_ENABLE_ADDRESS: u16 = 0xFFFF;
pub const INTERRUPT_FLAG_ADDRESS: u16 = 0xFF0F;
pub struct Bus {
@@ -51,6 +52,7 @@ impl Bus {
let game_rom = match ROM::load_file("ignore/tetris.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/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()) {
@@ -75,7 +77,7 @@ impl Bus {
return self.game_rom.read(address);
} else if VIDEO_RAM.in_range(address) {
if PPU::get_lcd_status(self, LCDStatus::ModeFlag(LCDStatusModeFlag::TransferringToLCD)) {
return 0xFF
return 0xFF;
}
} else if IO_REGISTERS.in_range(address) {
return self.data[address as usize];
@@ -104,7 +106,7 @@ impl Bus {
self.data[address as usize] = data;
self.data[(WORK_RAM_1.begin() + (address - ECHO_RAM.begin())) as usize] = data; // Copy to the working RAM
} else if VIDEO_RAM.in_range(address) {
//if !PPU::get_lcd_status(self, LCDStatus::ModeFlag(LCDStatusModeFlag::TransferringToLCD)) {
// if !PPU::get_lcd_status(self, LCDStatus::ModeFlag(LCDStatusModeFlag::TransferringToLCD)) {
self.data[address as usize] = data;
// }
} else {
@@ -118,14 +120,46 @@ impl Bus {
self.write(address.wrapping_add(1), bytes[1]);
}
pub fn set_flag(&mut self, flag: InterruptFlag, val: bool) {
let byte = self.read(INTERRUPT_FLAG_ADDRESS);
self.write(INTERRUPT_FLAG_ADDRESS, match flag {
InterruptFlag::VBlank => set_bit(byte, val, BitIndex::I0),
InterruptFlag::LCDSTAT => set_bit(byte, val, BitIndex::I1),
InterruptFlag::Timer => set_bit(byte, val, BitIndex::I2),
InterruptFlag::Serial => set_bit(byte, val, BitIndex::I3),
InterruptFlag::Joypad => set_bit(byte, val, BitIndex::I4),
pub fn set_interrupt_master(&mut self, flag: Interrupt, val: bool) {
let byte = self.read(INTERRUPT_ENABLE_ADDRESS);
self.write(INTERRUPT_ENABLE_ADDRESS, match flag {
Interrupt::VBlank => set_bit(byte, val, BitIndex::I0),
Interrupt::LCDSTAT => set_bit(byte, val, BitIndex::I1),
Interrupt::Timer => set_bit(byte, val, BitIndex::I2),
Interrupt::Serial => set_bit(byte, val, BitIndex::I3),
Interrupt::Joypad => set_bit(byte, val, BitIndex::I4),
});
}
pub fn set_interrupt(&mut self, flag: Interrupt, val: bool) {
let byte = self.read(INTERRUPT_FLAG_ADDRESS);
self.write(INTERRUPT_FLAG_ADDRESS, match flag {
Interrupt::VBlank => set_bit(byte, val, BitIndex::I0),
Interrupt::LCDSTAT => set_bit(byte, val, BitIndex::I1),
Interrupt::Timer => set_bit(byte, val, BitIndex::I2),
Interrupt::Serial => set_bit(byte, val, BitIndex::I3),
Interrupt::Joypad => set_bit(byte, val, BitIndex::I4),
});
}
pub fn get_interrupt(&mut self, flag: Interrupt) -> bool {
let byte = self.read(INTERRUPT_ENABLE_ADDRESS) & self.read(INTERRUPT_FLAG_ADDRESS);
match flag {
Interrupt::VBlank => get_bit(byte, BitIndex::I0),
Interrupt::LCDSTAT => get_bit(byte, BitIndex::I1),
Interrupt::Timer => get_bit(byte, BitIndex::I2),
Interrupt::Serial => get_bit(byte, BitIndex::I3),
Interrupt::Joypad => get_bit(byte, BitIndex::I4),
}
}
pub fn get_interrupt_vector(flag: Interrupt) -> u16 {
match flag {
Interrupt::VBlank => 0x40,
Interrupt::LCDSTAT => 0x48,
Interrupt::Timer => 0x50,
Interrupt::Serial => 0x58,
Interrupt::Joypad => 0x60,
}
}
}