uint8_t
rtc_read_second (void)
{
while (is_update_in_progress ())
expensive_nop ();
uint8_t second = read (reg_second);
uint8_t b = read (reg_b);
if (!(b & flag_binary))
second = (second & 0x0F) + ((second / 16) * 10);
return second;
}
bool x86_rtc_read(x86_rtc_data_t *dest)
{
if (!valid) {
return false;
}
unsigned old_status = irq_disable();
while (is_update_in_progress()) {
__asm__ volatile ("pause");
}
uint8_t b = x86_cmos_read(RTC_REG_B);
do {
dest->second = x86_cmos_read(RTC_REG_SECOND);
dest->minute = x86_cmos_read(RTC_REG_MINUTE);
dest->hour = x86_cmos_read(RTC_REG_HOUR);
dest->day = x86_cmos_read(RTC_REG_DAY);
dest->month = x86_cmos_read(RTC_REG_MONTH);
dest->year = x86_cmos_read(RTC_REG_YEAR);
dest->century = bcd2binary(x86_cmos_read(RTC_REG_CENTURY));
} while (dest->second != x86_cmos_read(RTC_REG_SECOND));
if (dest->century == 0) {
dest->century = 20; // safe guess
}
if (!(b & RTC_REG_B_BIN)) {
dest->second = bcd2binary(dest->second);
dest->minute = bcd2binary(dest->minute);
dest->hour = ((dest->hour & 0x0F) + (((dest->hour & 0x70) / 16) * 10)) | (dest->hour & 0x80);
dest->day = bcd2binary(dest->day);
dest->month = bcd2binary(dest->month);
dest->year = bcd2binary(dest->year);
}
if (!(b & RTC_REG_B_24H) && (dest->hour & 0x80)) {
dest->hour = ((dest->hour & 0x7F) + 12) % 24;
}
irq_restore(old_status);
return true;
}
bool
rtc_read (struct rtc_data *dest)
{
bool old_intr_level = intr_get_and_set_off ();
while (is_update_in_progress ())
expensive_nop ();
uint8_t second = read (reg_second);
uint8_t minute = read (reg_minute);
uint8_t hour = read (reg_hour);
uint8_t day = read (reg_day);
uint8_t month = read (reg_month);
uint8_t year = read (reg_year);
uint8_t b = read (reg_b);
if (!(b & flag_binary))
{
second = (second & 0x0F) + ((second / 16) * 10);
minute = (minute & 0x0F) + ((minute / 16) * 10);
hour = ( (hour & 0x0F) + (((hour & 0x70) / 16) * 10) ) | (hour & 0x80);
day = (day & 0x0F) + ((day / 16) * 10);
month = (month & 0x0F) + ((month / 16) * 10);
year = (year & 0x0F) + ((year / 16) * 10);
}
if (!(b & flag_24h) && (hour & 0x80))
hour = ((hour & 0x7F) + 12) % 24;
dest->second = second;
dest->minute = minute;
dest->hour = hour;
dest->day = day;
dest->month = month;
dest->year = year;
intr_set (old_intr_level);
return true;
}
