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cartridge oob data, wait states 1/2

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Matthew Berry 2020-11-07 19:40:29 -08:00
parent 8e21578553
commit 502df9b634
2 changed files with 14 additions and 14 deletions
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6
src/crab/bus.cr
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@ -20,7 +20,9 @@ class Bus
address -= 0x8000 if address > 0x17FFF address -= 0x8000 if address > 0x17FFF
@gba.ppu.vram[address] @gba.ppu.vram[address]
when 0x7 then @gba.ppu.oam[index & 0x3FF] when 0x7 then @gba.ppu.oam[index & 0x3FF]
when 0x8, 0x9 then @gba.cartridge[index & 0x7FFFFFF] when 0x8, 0x9,
0xA, 0xB,
0xC, 0xD then @gba.cartridge[index & 0x01FFFFFF]
else raise "Unmapped read: #{hex_str index.to_u32}" else raise "Unmapped read: #{hex_str index.to_u32}"
end end
end end
@ -74,7 +76,7 @@ class Bus
address -= 0x8000 if address > 0x17FFF address -= 0x8000 if address > 0x17FFF
@gba.ppu.vram[address] = value @gba.ppu.vram[address] = value
when 0x7 then @gba.ppu.oam[index & 0x3FF] when 0x7 then @gba.ppu.oam[index & 0x3FF]
when 0x8, 0x9 then @gba.cartridge[index & 0x7FFFFFF] = value when 0x8, 0x9 # can't write to cartridge
else raise "Unmapped write: #{hex_str index.to_u32}" else raise "Unmapped write: #{hex_str index.to_u32}"
end end
end end

14
src/crab/cartridge.cr
View file

@ -7,18 +7,16 @@ class Cartridge
io.to_s io.to_s
} }
def initialize(rom_path : String) @rom = Bytes.new 0x02000000 do |addr|
@rom = File.open rom_path do |file| oob = 0xFFFF & (addr >> 1)
bytes = Bytes.new file.size (oob >> (8 * (addr & 1))).to_u8!
file.read bytes
bytes
end end
def initialize(rom_path : String)
File.open(rom_path) { |file| file.read @rom }
end end
def [](index : Int) : Byte def [](index : Int) : Byte
@rom[index] @rom[index]
end end
def []=(index : Int, value : Byte) : Nil
end
end end