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some mbc3 rtc code (#284)

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Logan McNaughton 2025-02-26 21:00:15 +01:00 committed by GitHub
parent 82b4adb4ad
commit 319d7c8553
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1 changed files with 42 additions and 4 deletions
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46
src/device/controller/gbcart.rs
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@ -10,6 +10,11 @@ pub struct GbCart {
pub ram_enabled: bool,
pub ram_bank: u16,
pub rom_bank: u32,
pub set_latch: bool,
pub latch_second: u8,
pub latch_minute: u8,
pub latch_hour: u8,
pub latch_day: u16,
}
#[derive(Default, Copy, Clone, serde::Serialize, serde::Deserialize)]
@ -40,7 +45,10 @@ fn write_mbc3(
} else if address < 0x6000 {
cart.ram_bank = (value & 0xf) as u16;
} else if address < 0x8000 {
// RTC not implemented
if !cart.set_latch && value != 0 {
// not implemented
}
cart.set_latch = value != 0;
} else if (0xa000..0xc000).contains(&address) {
if !cart.ram_enabled {
return;
@ -50,7 +58,28 @@ fn write_mbc3(
cart.ram[banked_address as usize..banked_address as usize + size]
.copy_from_slice(&pif_ram[data..data + size]);
} else {
// RTC not implemented
match cart.ram_bank {
0x8 => {
cart.latch_second = value;
}
0x9 => {
cart.latch_minute = value;
}
0xA => {
cart.latch_hour = value;
}
0xB => {
cart.latch_day &= 0xFF00;
cart.latch_day |= value as u16;
}
0xC => {
cart.latch_day &= 0x00FF;
cart.latch_day |= (value as u16) << 8;
}
_ => {
panic!("Unsupported ram bank {:x}", cart.ram_bank);
}
}
}
} else {
panic!("Unsupported write address {:x}", address);
@ -91,9 +120,18 @@ fn read_mbc3(
);
}
} else {
// RTC not implemented
let latch = match cart.ram_bank {
0x8 => cart.latch_second,
0x9 => cart.latch_minute,
0xA => cart.latch_hour,
0xB => cart.latch_day as u8,
0xC => (cart.latch_day >> 8) as u8,
_ => {
panic!("Unsupported ram bank {:x}", cart.ram_bank);
}
};
for i in 0..size {
pif_ram[data + i] = 0;
pif_ram[data + i] = latch;
}
}
} else {