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feat: impelement a barebones SRAM

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This commit is contained in:
Rekai Nyangadzayi Musuka
2022-10-21 05:12:23 -03:00
parent 4d75d156e5
commit d4c7cfdf8b
3 changed files with 43 additions and 5 deletions
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4
src/Bus.zig
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@@ -138,7 +138,7 @@ pub fn read8(self: *const Self, addr: u32) u8 {
0x0800_0000...0x09FF_FFFF => self.pak.get8(addr - 0x0800_0000),
0x0A00_0000...0x0BFF_FFFF => self.pak.get8(addr - 0x0A00_0000),
0x0C00_0000...0x0DFF_FFFF => self.pak.get8(addr - 0x0C00_0000),
0x0E00_0000...0x0E00_FFFF => std.debug.panic("Read from 0x{X:0>2} in Game Pak SRAM", .{addr}),
0x0E00_0000...0x0E00_FFFF => self.pak.sram.get8(addr - 0x0E00_0000),
else => std.debug.panic("Tried to read from 0x{X:0>2}", .{addr}),
};
@@ -153,7 +153,7 @@ pub fn write8(self: *Self, addr: u32, byte: u8) void {
0x0400_0410 => log.info("Wrote 0x{X:0>2} to 0x{X:0>8}. Ignored", .{ byte, addr }),
// External Memory (Game Pak)
0x0E00_0000...0x0E00_FFFF => log.err("Wrote 0x{X:0>2} to 0x{X:0>8} in Game Pak SRAM", .{ byte, addr }),
0x0E00_0000...0x0E00_FFFF => self.pak.sram.set8(addr - 0x0E00_0000, byte),
else => std.debug.panic("Tried to write 0x{X:0>2} to 0x{X:0>8}", .{ byte, addr }),
}
}