91 lines
2.4 KiB
C
91 lines
2.4 KiB
C
/* FCE Ultra - NES/Famicom Emulator
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*
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* Copyright notice for this file:
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* Copyright (C) 2025 NewRisingSun
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*
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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 2 of the License, or
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* (at your option) any later version.
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*
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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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*
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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, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "mapinc.h"
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#include "asic_latch.h"
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static void (*Latch_cbSync)();
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static uint16 Latch_from, Latch_to;
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static void (*Latch_cbWrite)(uint16*, uint8*, uint8);
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uint16 Latch_address;
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uint8 Latch_data;
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static SFORMAT Latch_state[] = {
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{&Latch_address, 2, "LATA" },
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{&Latch_data, 1, "LATD" },
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{ 0 }
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};
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DECLFW(Latch_write) {
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uint16 newAddress = A &0xFFFF;
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if (Latch_cbWrite) Latch_cbWrite(&newAddress, &V, CartBR(A));
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Latch_address = newAddress;
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Latch_data = V;
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Latch_cbSync();
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}
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void Latch_clear () {
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Latch_address = 0;
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Latch_data = 0;
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Latch_cbSync();
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}
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static void Latch_setHandlers() {
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SetReadHandler(0x8000, 0xFFFF, CartBR);
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SetWriteHandler(Latch_from, Latch_to, Latch_write);
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}
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static void Latch_configure (void (*sync)(), uint16 from, uint16 to, void (*write)(uint16*, uint8*, uint8)) {
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Latch_cbSync = sync;
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Latch_from = from;
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Latch_to = to;
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Latch_cbWrite = write;
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}
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void Latch_activate (uint8 clear, void (*sync)(), uint16 from, uint16 to, void (*write)(uint16*, uint8*, uint8)) {
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Latch_configure(sync, from, to, write);
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Latch_setHandlers();
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if (clear)
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Latch_clear();
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else
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Latch_cbSync();
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}
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void Latch_addExState () {
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AddExState(Latch_state, ~0, 0, 0);
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}
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void Latch_restore (int version) {
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Latch_cbSync();
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}
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void Latch_power () {
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Latch_setHandlers();
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Latch_clear();
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}
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void Latch_init (CartInfo *info, void (*sync)(), uint16 from, uint16 to, void (*write)(uint16*, uint8*, uint8)) {
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Latch_addExState();
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Latch_configure(sync, from, to, write);
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info->Power = Latch_power;
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info->Reset = Latch_cbSync;
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GameStateRestore = Latch_restore;
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}
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