mirror of https://github.com/bsnes-emu/bsnes.git
119 lines
2.8 KiB
C++
119 lines
2.8 KiB
C++
auto Cartridge::MBC3::second() -> void {
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if(!rtc.halt) {
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if(++rtc.second >= 60) {
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rtc.second = 0;
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if(++rtc.minute >= 60) {
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rtc.minute = 0;
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if(++rtc.hour >= 24) {
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rtc.hour = 0;
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if(++rtc.day >= 512) {
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rtc.day = 0;
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rtc.dayCarry = true;
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}
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}
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}
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}
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}
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}
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auto Cartridge::MBC3::readIO(uint16 addr) -> uint8 {
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if((addr & 0xc000) == 0x0000) { //$0000-3fff
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return cartridge.readROM(addr);
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}
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if((addr & 0xc000) == 0x4000) { //$4000-7fff
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return cartridge.readROM(rom.select<< 14 | (uint14)addr);
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}
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if((addr & 0xe000) == 0xa000) { //$a000-bfff
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if(ram.enable) {
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if(ram.select <= 0x03) {
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return cartridge.readRAM(ram.select << 13 | (uint13)addr);
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}
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if(ram.select == 0x08) return rtc.latchSecond;
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if(ram.select == 0x09) return rtc.latchMinute;
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if(ram.select == 0x0a) return rtc.latchHour;
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if(ram.select == 0x0b) return rtc.latchDay;
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if(ram.select == 0x0c) return rtc.latchDayCarry << 7 | rtc.latchDay >> 8;
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}
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return 0xff;
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}
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return 0xff;
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}
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auto Cartridge::MBC3::writeIO(uint16 addr, uint8 data) -> void {
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if((addr & 0xe000) == 0x0000) { //$0000-1fff
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ram.enable = (data & 0x0f) == 0x0a;
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return;
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}
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if((addr & 0xe000) == 0x2000) { //$2000-3fff
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rom.select = (data & 0x7f) + ((data & 0x7f) == 0);
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return;
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}
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if((addr & 0xe000) == 0x4000) { //$4000-5fff
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ram.select = data;
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return;
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}
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if((addr & 0xe000) == 0x6000) { //$6000-7fff
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if(rtc.latch == 0 && data == 1) {
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rtc.latchSecond = rtc.second;
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rtc.latchMinute = rtc.minute;
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rtc.latchHour = rtc.hour;
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rtc.latchDay = rtc.day;
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rtc.latchDayCarry = rtc.dayCarry;
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}
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rtc.latch = data;
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return;
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}
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if((addr & 0xe000) == 0xa000) { //$a000-bfff
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if(ram.enable) {
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if(ram.select <= 0x03) {
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cartridge.writeRAM(ram.select << 13 | (uint13)addr, data);
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} else if(ram.select == 0x08) {
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if(data >= 60) data = 0;
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rtc.second = data;
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} else if(ram.select == 0x09) {
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if(data >= 60) data = 0;
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rtc.minute = data;
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} else if(ram.select == 0x0a) {
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if(data >= 24) data = 0;
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rtc.hour = data;
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} else if(ram.select == 0x0b) {
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rtc.day = (rtc.day & 0x0100) | data;
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} else if(ram.select == 0x0c) {
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rtc.day = ((data & 1) << 8) | (rtc.day & 0xff);
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rtc.halt = data & 0x40;
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rtc.dayCarry = data & 0x80;
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}
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}
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return;
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}
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}
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auto Cartridge::MBC3::power() -> void {
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rom.select = 0x01;
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ram.enable = false;
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ram.select = 0x00;
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rtc.latch = 0;
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rtc.halt = true;
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rtc.second = 0;
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rtc.minute = 0;
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rtc.hour = 0;
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rtc.day = 0;
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rtc.dayCarry = false;
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rtc.latchSecond = 0;
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rtc.latchMinute = 0;
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rtc.latchHour = 0;
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rtc.latchDay = 0;
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rtc.latchDayCarry = false;
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}
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