130 lines
2.9 KiB
C
130 lines
2.9 KiB
C
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/* 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_VRC3.h"
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static void (*VRC3_cbSync)();
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static uint8 VRC3_prg;
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static uint8 VRC3_irq;
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static uint16 VRC3_count;
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static uint16 VRC3_reload;
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static SFORMAT VRC3_state[] = {
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{&VRC3_prg, 1, "VC3P" },
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{&VRC3_irq, 1, "VC3I" },
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{&VRC3_count, 1, "VC3C" },
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{&VRC3_reload, 1, "VC3R" },
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{ 0 }
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};
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void VRC3_syncWRAM (int OR) {
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if (PRGsize[0x10]) setprg8r(0x10, 0x6000, OR);
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}
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void VRC3_syncPRG (int AND, int OR) {
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setprg16(0x8000, VRC3_prg &AND |OR);
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setprg16(0xC000, 0xFF &AND |OR);
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}
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void VRC3_syncCHR (int AND, int OR) {
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setchr8(OR);
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}
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DECLFW(VRC3_write) {
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int shift;
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switch (A >>12 &7) {
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case 0: case 1: case 2: case 3:
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V &=0xF;
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shift = A >>10 &0xC;
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VRC3_reload = VRC3_reload &~(0xF <<shift) | V <<shift;
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break;
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case 4:
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VRC3_irq = V;
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if (VRC3_irq &2) VRC3_count = VRC3_reload;
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break;
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case 5:
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VRC3_irq = VRC3_irq &~2 | VRC3_irq <<1 &1;
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X6502_IRQEnd(FCEU_IQEXT);
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break;
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case 7:
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VRC3_prg = V;
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VRC3_cbSync();
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break;
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}
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}
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void FP_FASTAPASS(1) VRC3_cpuCycle (int a) {
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while (a--) {
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int mask = VRC3_irq &4? 0xFF: 0xFFFF;
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if ((VRC3_count++ &mask) == mask) {
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VRC3_count = VRC3_reload;
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X6502_IRQBegin(FCEU_IQEXT);
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}
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}
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}
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static void VRC3_clear () {
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VRC3_prg = VRC3_irq = VRC3_count = VRC3_reload = 0;
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X6502_IRQEnd(FCEU_IQEXT);
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VRC3_cbSync();
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}
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static void VRC3_setHandlers () {
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SetReadHandler (0x6000, 0xFFFF, CartBR);
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SetWriteHandler(0x6000, 0x7FFF, CartBW);
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SetWriteHandler(0x8000, 0xFFFF, VRC3_write);
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MapIRQHook = VRC3_cpuCycle;
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}
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static void VRC3_configure (void (*sync)()) {
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VRC3_cbSync = sync;
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}
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void VRC3_activate (uint8 clear, void (*sync)()) {
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VRC3_configure(sync);
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VRC3_setHandlers();
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if (clear)
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VRC3_clear();
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else
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VRC3_cbSync();
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}
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void VRC3_addExState () {
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AddExState(VRC3_state, ~0, 0, 0);
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}
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void VRC3_restore (int version) {
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VRC3_cbSync();
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}
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void VRC3_power () {
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VRC3_setHandlers();
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VRC3_clear();
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}
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void VRC3_init (CartInfo *info, void (*sync)()) {
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VRC3_addExState();
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VRC3_configure(sync);
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info->Power = VRC3_power;
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info->Reset = VRC3_cbSync;
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GameStateRestore = VRC3_restore;
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}
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