/**
* Updates the date-data in the global time struct
*/
void rtc_update()
{
outb(RTC_ADDR, RTC_SEC);
time.sec = inb(RTC_DATA);
if (time.sec == 0) {
outb(RTC_ADDR, RTC_MIN);
time.min = inb(RTC_DATA);
if (time.min == 0) {
outb(RTC_ADDR, RTC_HOUR);
time.hour = inb(RTC_DATA);
if (time.hour == 0) {
outb(RTC_ADDR, RTC_DAY);
time.day = inb(RTC_DATA);
if (time.day == 1) {
outb(RTC_ADDR, RTC_MONTH);
time.month = inb(RTC_DATA);
if (time.month == 1) {
outb(RTC_ADDR, RTC_YEAR);
time.year = inb(RTC_DATA);
if (time.year == 1) {
outb(RTC_ADDR, RTC_CENTURY);
time.century = inb(RTC_DATA);
}
}
}
calculate_weekday(&time);
}
}
}
}
void SharpRTC::write(unsigned addr, uint8 data) {
addr &= 1, data &= 15;
if(addr == 1) {
if(data == 0x0d) {
rtc_state = State::Read;
rtc_index = -1;
return;
}
if(data == 0x0e) {
rtc_state = State::Command;
return;
}
if(data == 0x0f) return; //unknown behavior
if(rtc_state == State::Command) {
if(data == 0) {
rtc_state = State::Write;
rtc_index = 0;
} else if(data == 4) {
rtc_state = State::Ready;
rtc_index = -1;
//reset time
second = 0;
minute = 0;
hour = 0;
day = 0;
month = 0;
year = 0;
weekday = 0;
} else {
//unknown behavior
rtc_state = State::Ready;
}
return;
}
if(rtc_state == State::Write) {
if(rtc_index >= 0 && rtc_index < 12) {
rtc_write(rtc_index++, data);
if(rtc_index == 12) {
//day of week is automatically calculated and written
weekday = calculate_weekday(1000 + year, month, day);
}
}
return;
}
}
}
/**
* Initializes the global data struct
*/
void rtc_init()
{
// TODO: is this necessary?
// sets rtc parameters
// outb(RTC_ADDR, RTC_STATB);
// outb(RTC_DATA, 0x7E);
outb(RTC_ADDR, RTC_SEC);
time.sec = inb(RTC_DATA);
outb(RTC_ADDR, RTC_MIN);
time.min = inb(RTC_DATA);
outb(RTC_ADDR, RTC_HOUR);
time.hour = inb(RTC_DATA);
outb(RTC_ADDR, RTC_DAY);
time.day = inb(RTC_DATA);
outb(RTC_ADDR, RTC_MONTH);
time.month = inb(RTC_DATA);
outb(RTC_ADDR, RTC_YEAR);
time.year = inb(RTC_DATA);
outb(RTC_ADDR, RTC_CENTURY);
time.century = inb(RTC_DATA);
calculate_weekday(&time);
}
