class GBA::Bus

• GBA::Bus
• Reference
• Object

Defined in:

crab/gba/bus.cr

Constant Summary

ACCESS_TIMING_TABLE = Slice[[1, 1, 3, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2, 2, 2, 2], [1, 1, 6, 1, 1, 2, 2, 1, 4, 4, 4, 4, 4, 4, 4, 4]]

Timings for rom are estimated for game compatibility.

Constructors

• .new(gba : GBA, bios_path : String)

Instance Method Summary

• #[](address : UInt32) : UInt8
• #[]=(address : UInt32, value : UInt8) : Nil
• #[]=(address : UInt32, value : UInt16) : Nil
• #[]=(address : UInt32, value : UInt32) : Nil
• #bios : Slice(UInt8)
• #cycles : Int32
• #cycles=(cycles : Int32)
• #read_half(address : UInt32) : UInt16
• #read_half_internal(address : UInt32) : UInt16
• #read_half_rotate(address : UInt32) : UInt32
• #read_half_signed(address : UInt32) : UInt32

  On ARM7 aka ARMv4 aka NDS7/GBA: LDRH Rd,[odd] --> LDRH Rd,[odd-1] ROR 8 ;read to bit0-7 and bit24-31 LDRSH Rd,[odd] --> LDRSB Rd,[odd] ;sign-expand BYTE value

• #read_open_bus_value(address : UInt32, _file = __FILE__) : UInt8
• #read_word(address : UInt32) : UInt32
• #read_word_rotate(address : UInt32) : UInt32
• #wram_board : Slice(UInt8)
• #wram_chip : Slice(UInt8)

Constructor Detail

Instance Method Detail