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8-bit writes to video memory

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Matthew Berry 2021-02-26 18:29:21 -08:00
parent b9c360f229
commit fb3354521c
1 changed files with 3 additions and 5 deletions
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8
src/crab/bus.cr
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@ -99,12 +99,10 @@ class Bus
when 0x2 then @wram_board[index & 0x3FFFF] = value
when 0x3 then @wram_chip[index & 0x7FFF] = value
when 0x4 then @gba.mmio[index] = value
when 0x5 then @gba.ppu.pram[index & 0x3FF] = value
when 0x5 then (@gba.ppu.pram.to_unsafe + (index & 0x3FE)).as(HalfWord*).value = 0x0101_u16 * value
when 0x6
address = 0x1FFFF_u32 & index
address -= 0x8000 if address > 0x17FFF
@gba.ppu.vram[address] = value
when 0x7 then @gba.ppu.oam[index & 0x3FF] = value
address = 0x1FFFE_u32 & index # todo ignored range is different when in bitmap mode
(@gba.ppu.vram.to_unsafe + address).as(HalfWord*).value = 0x0101_u16 * value if address <= 0x0FFFF
when 0xE, 0xF then @gba.storage[index] = value
else log "Unmapped write: #{hex_str index.to_u32}"
end