mirror of https://github.com/bsnes-emu/bsnes.git
117 lines
2.9 KiB
C++
117 lines
2.9 KiB
C++
auto Cartridge::MBC3::second() -> void {
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if(rtc_halt == false) {
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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_day_carry = 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::mmio_read(uint16 addr) -> uint8 {
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if((addr & 0xc000) == 0x0000) { //$0000-3fff
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return cartridge.rom_read(addr);
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}
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if((addr & 0xc000) == 0x4000) { //$4000-7fff
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return cartridge.rom_read((rom_select << 14) | (addr & 0x3fff));
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}
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if((addr & 0xe000) == 0xa000) { //$a000-bfff
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if(ram_enable) {
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if(ram_select >= 0x00 && ram_select <= 0x03) {
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return cartridge.ram_read((ram_select << 13) | (addr & 0x1fff));
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}
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if(ram_select == 0x08) return rtc_latch_second;
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if(ram_select == 0x09) return rtc_latch_minute;
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if(ram_select == 0x0a) return rtc_latch_hour;
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if(ram_select == 0x0b) return rtc_latch_day;
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if(ram_select == 0x0c) return (rtc_latch_day_carry << 7) | (rtc_latch_day >> 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::mmio_write(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) { //$6000-7fff
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if(rtc_latch == 0 && data == 1) {
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rtc_latch_second = rtc_second;
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rtc_latch_minute = rtc_minute;
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rtc_latch_hour = rtc_hour;
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rtc_latch_day = rtc_day;
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rtc_latch_day_carry = rtc_day_carry;
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}
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rtc_latch = data;
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return;
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}
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if((addr & 0xe000) == 0xa000) { //$a000-bfff
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if(ram_enable) {
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if(ram_select >= 0x00 && ram_select <= 0x03) {
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cartridge.ram_write((ram_select << 13) | (addr & 0x1fff), 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_day_carry = 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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ram_enable = false;
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rom_select = 0x01;
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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_day_carry = false;
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rtc_latch_second = 0;
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rtc_latch_minute = 0;
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rtc_latch_hour = 0;
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rtc_latch_day = 0;
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rtc_latch_day_carry = false;
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}
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