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cleanup mmio range checks a little bit..

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This commit is contained in:
Matthew Berry 2020-12-05 17:26:14 -08:00
parent 9f65505731
commit 50dc14eddb
1 changed files with 8 additions and 8 deletions
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16
src/crab/mmio.cr
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@ -24,11 +24,11 @@ class MMIO
@gba.ppu.read_io io_addr
elsif io_addr <= 0xAF
@gba.apu.read_io io_addr
elsif (io_addr >= 0x200 && io_addr <= 0x203) || (io_addr >= 0x208 && io_addr <= 0x209)
@gba.interrupts.read_io io_addr
elsif io_addr >= 0x130 && io_addr <= 0x133
elsif 0x130 <= io_addr <= 0x133
@gba.keypad.read_io io_addr
elsif io_addr >= 0x204 && io_addr <= 0x205
elsif 0x200 <= io_addr <= 0x203 || 0x208 <= io_addr <= 0x209
@gba.interrupts.read_io io_addr
elsif 0x204 <= io_addr <= 0x205
(@waitcnt.value >> (8 * (io_addr & 1))).to_u8!
elsif not_used? io_addr
0xFF_u8 # todo what is returned here?
@ -44,11 +44,11 @@ class MMIO
@gba.ppu.write_io io_addr, value
elsif io_addr <= 0xAF
@gba.apu.write_io io_addr, value
elsif (io_addr >= 0x200 && io_addr <= 0x203) || (io_addr >= 0x208 && io_addr <= 0x209)
@gba.interrupts.write_io io_addr, value
elsif io_addr >= 0x130 && io_addr <= 0x133
elsif 0x130 <= io_addr <= 0x133
@gba.keypad.read_io io_addr
elsif io_addr >= 0x204 && io_addr <= 0x205
elsif 0x200 <= io_addr <= 0x203 || 0x208 <= io_addr <= 0x209
@gba.interrupts.write_io io_addr, value
elsif 0x204 <= io_addr <= 0x205
shift = 8 * (io_addr & 1)
mask = 0xFF00_u16 >> shift
@waitcnt.value = (@waitcnt.value & mask) | value.to_u16 << shift