132 lines
3.1 KiB
NASM
132 lines
3.1 KiB
NASM
; DMGTRIS
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; Copyright (C) 2023 - Randy Thiemann <randy.thiemann@gmail.com>
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; This program is free software: you can redistribute it and/or modify
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; it under the terms of the GNU General Public License as published by
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; the Free Software Foundation, either version 3 of the License, or
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; (at your option) any later version.
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; This program is distributed in the hope that it will be useful,
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; but WITHOUT ANY WARRANTY; without even the implied warranty of
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; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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; GNU General Public License for more details.
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; You should have received a copy of the GNU General Public License
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; along with this program. If not, see <https://www.gnu.org/licenses/>.
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IF !DEF(SRAM_ASM)
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DEF SRAM_ASM EQU 1
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INCLUDE "globals.asm"
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SECTION "Persistent Globals", SRAM
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rCheck:: ds 6
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rSwapABState:: ds 1
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rRNGModeState:: ds 1
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rRotModeState:: ds 1
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rDropModeState:: ds 1
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rSpeedCurveState:: ds 1
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rAlways20GState:: ds 1
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rSelectedStartLevel:: ds 2
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SECTION "SRAM Functions", ROM0
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; Check if our SRAM is initialized and of the correct version.
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; Restores it if so, otherwise initializes it.
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RestoreSRAM::
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ld a, [rCheck]
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cp a, LOW(__UTC_YEAR__)
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jr nz, InitializeSRAM
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ld a, [rCheck+1]
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cp a, __UTC_MONTH__
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jr nz, InitializeSRAM
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ld a, [rCheck+2]
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cp a, __UTC_DAY__
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jr nz, InitializeSRAM
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ld a, [rCheck+3]
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cp a, __UTC_HOUR__
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jr nz, InitializeSRAM
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ld a, [rCheck+4]
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cp a, __UTC_MINUTE__
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jr nz, InitializeSRAM
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ld a, [rCheck+5]
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cp a, __UTC_SECOND__
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jr nz, InitializeSRAM
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; SRAM is initialized and for this build, so we can load the data.
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ld a, [rSwapABState]
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ld [wSwapABState], a
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ld a, [rRNGModeState]
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ld [wRNGModeState], a
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ld a, [rRotModeState]
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ld [wRotModeState], a
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ld a, [rDropModeState]
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ld [wDropModeState], a
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ld a, [rSpeedCurveState]
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ld [wSpeedCurveState], a
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ld a, [rAlways20GState]
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ld [wAlways20GState], a
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ld a, [rSelectedStartLevel]
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ldh [hStartSpeed], a
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ld a, [rSelectedStartLevel+1]
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ldh [hStartSpeed+1], a
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ret
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; Initializes SRAM with default values.
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InitializeSRAM:
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; Set the magic id.
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ld a, LOW(__UTC_YEAR__)
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ld [rCheck], a
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ld a, __UTC_MONTH__
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ld [rCheck+1], a
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ld a, __UTC_DAY__
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ld [rCheck+2], a
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ld a, __UTC_HOUR__
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ld [rCheck+3], a
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ld a, __UTC_MINUTE__
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ld [rCheck+4], a
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ld a, __UTC_SECOND__
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ld [rCheck+5], a
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; Load defaults.
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ld a, BUTTON_MODE_NORM
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ld [rSwapABState], a
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ld [wSwapABState], a
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ld a, RNG_MODE_TGM3
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ld [rRNGModeState], a
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ld [wRNGModeState], a
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ld a, ROT_MODE_ARSTI
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ld [rRotModeState], a
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ld [wRotModeState], a
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ld a, DROP_MODE_FIRM
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ld [rDropModeState], a
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ld [wDropModeState], a
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ld a, SCURVE_DMGT
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ld [rSpeedCurveState], a
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ld [wSpeedCurveState], a
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ld a, HIG_MODE_OFF
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ld [rAlways20GState], a
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ld [wAlways20GState], a
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; Set to the default start level.
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ld hl, sDMGTSpeedCurve
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ld a, l
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ldh [hStartSpeed], a
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ld [rSelectedStartLevel], a
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ld a, h
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ldh [hStartSpeed+1], a
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ld [rSelectedStartLevel+1], a
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ret
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ENDC
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