mirror of https://github.com/bsnes-emu/bsnes.git
151 lines
3.5 KiB
C++
151 lines
3.5 KiB
C++
//calculate time between last play of game and current time;
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//increment RTC by said amount of seconds
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auto Cartridge::rtcLoad() -> void {
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uint64 timestamp = 0;
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for(auto n : range(8)) timestamp.byte(n) = rtc.data[8 + n];
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if(!timestamp) return; //new save file
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timestamp = time(0) - timestamp;
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while(timestamp--) rtcTickSecond();
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}
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//save time when game is unloaded
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auto Cartridge::rtcSave() -> void {
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uint64 timestamp = time(0);
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for(auto n : range(8)) rtc.data[8 + n] = timestamp.byte(n);
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}
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auto Cartridge::rtcTickSecond() -> void {
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if(++rtc.second() < 60) return;
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rtc.second() = 0;
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if(++rtc.minute() < 60) return;
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rtc.minute() = 0;
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if(++rtc.hour() < 60) return;
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rtc.hour() = 0;
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rtc.weekday() += 1;
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rtc.weekday() %= 7;
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uint daysInMonth[12] = {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
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if(rtc.year() && (rtc.year() % 100) && !(rtc.year() % 4)) daysInMonth[1]++;
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if(++rtc.day() < daysInMonth[rtc.month()]) return;
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rtc.day() = 0;
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if(++rtc.month() < 12) return;
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rtc.month() = 0;
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++rtc.year();
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}
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auto Cartridge::rtcCheckAlarm() -> void {
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if(!rtc.alarm.bit(5)) return;
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if(rtc.hour() == rtc.alarmHour && rtc.minute() == rtc.alarmMinute) {
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cpu.raise(CPU::Interrupt::Cartridge);
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} else {
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cpu.lower(CPU::Interrupt::Cartridge);
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}
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}
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auto Cartridge::rtcStatus() -> uint8 {
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return 0x80;
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}
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auto Cartridge::rtcCommand(uint8 data) -> void {
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rtc.command = data;
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//RESET
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if(rtc.command == 0x10) {
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rtc.year() = 0;
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rtc.month() = 0;
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rtc.day() = 0;
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rtc.weekday() = 0;
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rtc.hour() = 0;
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rtc.minute() = 0;
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rtc.second() = 0;
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}
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//ALARM_FLAG
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if(rtc.command == 0x12) {
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rtc.index = 0;
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}
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//SET_DATETIME
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if(rtc.command == 0x14) {
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rtc.index = 0;
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}
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//GET_DATETIME
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if(rtc.command == 0x15) {
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rtc.index = 0;
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}
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//SET_ALARM
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if(rtc.command == 0x18) {
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rtc.index = 0;
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}
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}
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auto Cartridge::rtcRead() -> uint8 {
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uint8 data = 0;
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static auto encode = [](uint8 data) -> uint8 {
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return ((data / 10) << 4) + (data % 10);
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};
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//GET_DATETIME
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if(rtc.command == 0x15) {
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switch(rtc.index) {
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case 0: data = encode(rtc.year()); break;
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case 1: data = encode(rtc.month() + 1); break;
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case 2: data = encode(rtc.day() + 1); break;
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case 3: data = encode(rtc.weekday()); break;
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case 4: data = encode(rtc.hour()); break;
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case 5: data = encode(rtc.minute()); break;
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case 6: data = encode(rtc.second()); break;
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}
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if(++rtc.index >= 7) rtc.command = 0;
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}
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return data;
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}
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auto Cartridge::rtcWrite(uint8 data) -> void {
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static auto decode = [](uint8 data) -> uint8 {
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return (data >> 4) * 10 + (data & 0x0f);
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};
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//ALARM_FLAG
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if(rtc.command == 0x12) {
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if(data.bit(6)) rtc.alarm = data; //todo: is bit6 really required to be set?
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rtc.command = 0;
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rtcCheckAlarm();
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}
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//SET_DATETIME
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if(rtc.command == 0x14) {
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switch(rtc.index) {
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case 0: rtc.year() = decode(data); break;
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case 1: rtc.month() = decode(data) - 1; break;
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case 2: rtc.day() = decode(data) - 1; break;
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case 3: rtc.weekday() = decode(data); break;
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case 4: rtc.hour() = decode(data); break;
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case 5: rtc.minute() = decode(data); break;
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case 6: rtc.second() = decode(data); break;
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}
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if(++rtc.index >= 7) rtc.command = 0;
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}
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//SET_ALRM
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if(rtc.command == 0x18) {
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switch(rtc.index) {
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case 0: rtc.alarmHour = decode(data.bits(0,6)); break;
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case 1: rtc.alarmMinute = decode(data); break;
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}
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if(++rtc.index >= 2) rtc.command = 0;
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}
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}
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