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https://gitlab.com/xCrystal/pokecrystal-board.git
synced 2024-09-09 09:51:34 -07:00
113 lines
1.2 KiB
NASM
113 lines
1.2 KiB
NASM
ResetMapBufferEventFlags:: ; 2e50
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xor a
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ld hl, EventFlags
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ld [hli], a
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ret
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; 2e56
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ResetBikeFlags:: ; 2e56
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xor a
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ld hl, BikeFlags
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ld [hli], a
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ld [hl], a
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ret
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; 2e5d
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ResetFlashIfOutOfCave:: ; 2e5d
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ld a, [wPermission]
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cp $2
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jr z, .asm_2e69
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cp $1
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jr z, .asm_2e69
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ret
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.asm_2e69
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ld hl, StatusFlags
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res 2, [hl]
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ret
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; 2e6f
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EventFlagAction:: ; 0x2e6f
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ld hl, EventFlags
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call FlagAction
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ret
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FlagAction:: ; 0x2e76
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; Perform action b on bit de in flag array hl.
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; inputs:
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; b: function
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; 0 clear bit
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; 1 set bit
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; 2 check bit
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; de: bit number
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; hl: index within bit table
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; get index within the byte
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ld a, e
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and 7
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; shift de right by three bits (get the index within memory)
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srl d
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rr e
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srl d
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rr e
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srl d
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rr e
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add hl, de
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; implement a decoder
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ld c, 1
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rrca
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jr nc, .one
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rlc c
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.one
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rrca
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jr nc, .two
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rlc c
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rlc c
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.two
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rrca
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jr nc, .three
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swap c
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.three
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; check b's value: 0, 1, 2
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ld a, b
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cp 1
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jr c, .clearbit ; 0
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jr z, .setbit ; 1
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; check bit
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ld a, [hl]
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and c
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ld c, a
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ret
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.setbit
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; set bit
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ld a, [hl]
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or c
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ld [hl], a
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ret
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.clearbit
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; clear bit
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ld a, c
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cpl
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and [hl]
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ld [hl], a
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ret
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; 0x2ead
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CheckReceivedDex:: ; 2ead
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ld de, ENGINE_POKEDEX
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ld b, CHECK_FLAG
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callba EngineFlagAction
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ld a, c
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and a
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ret
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; 2ebb
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