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Adds title screen section to tutorial #83
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Original file line number | Diff line number | Diff line change |
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; This is a simplified version of pads.z80 by PinoBatch for use in gb-asm-tutorial | ||
; All labels are intentionally not exported to avoid confusing the reader with unfamiliar syntax. | ||
; Once linking is introduced in part 3, a new, exported version of this file will be provided. | ||
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INCLUDE "../hardware.inc" | ||
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SECTION "Input Variables", WRAM0 | ||
wCurKeys:: db | ||
wNewKeys:: db | ||
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SECTION "UpdateKeys", ROM0 | ||
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UpdateKeys:: | ||
; Poll half the controller | ||
ld a, P1F_GET_BTN | ||
call .onenibble | ||
ld b, a ; B7-4 = 1; B3-0 = unpressed buttons | ||
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; Poll the other half | ||
ld a, P1F_GET_DPAD | ||
call .onenibble | ||
swap a ; A3-0 = unpressed directions; A7-4 = 1 | ||
xor a, b ; A = pressed buttons + directions | ||
ld b, a ; B = pressed buttons + directions | ||
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; And release the controller | ||
ld a, P1F_GET_NONE | ||
ldh [rP1], a | ||
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; Combine with previous wCurKeys to make wNewKeys | ||
ld a, [wCurKeys] | ||
xor a, b ; A = keys that changed state | ||
and a, b ; A = keys that changed to pressed | ||
ld [wNewKeys], a | ||
ld a, b | ||
ld [wCurKeys], a | ||
ret | ||
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.onenibble | ||
ldh [rP1], a ; switch the key matrix | ||
call .knownret ; burn 10 cycles calling a known ret | ||
ldh a, [rP1] ; ignore value while waiting for the key matrix to settle | ||
ldh a, [rP1] | ||
ldh a, [rP1] ; this read counts | ||
or a, $F0 ; A7-4 = 1; A3-0 = unpressed keys | ||
.knownret | ||
ret |
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maybe we can open an issue regarding exporting labels in a later interaction?