void rtca_update_dow()
{
uint8_t dow;
dow = LEAPS_SINCE_YEAR(rtca_time.year);
if ((29 == rtca_get_max_days(2, rtca_time.year)) && (rtca_time.mon < 3))
dow--; /* if this is a leap year but before February 29 */
/* add day of current month */
dow += rtca_time.day;
/* add this month's dow value */
switch (rtca_time.mon) {
case 5:
dow += 1;
break;
case 8:
dow += 2;
break;
case 2:
case 3:
case 11:
dow += 3;
break;
case 6:
dow += 4;
break;
case 9:
case 12:
dow += 5;
break;
case 4:
case 7:
dow += 6;
break;
}
dow = dow % 7;
rtca_time.dow = dow;
}
void rtca_set_date()
{
uint8_t dow;
/* Stop RTC timekeeping for a while */
rtca_stop();
dow = LEAPS_SINCE_YEAR(rtca_time.year);
if ((29 == rtca_get_max_days(2, rtca_time.year)) && (rtca_time.mon < 3))
dow--; /* if this is a leap year but before February 29 */
/* add day of current month */
dow += rtca_time.day;
/* add this month's dow value */
switch (rtca_time.mon) {
case 5:
dow += 1;
break;
case 8:
dow += 2;
break;
case 2:
case 3:
case 11:
dow += 3;
break;
case 6:
dow += 4;
break;
case 9:
case 12:
dow += 5;
break;
case 4:
case 7:
dow += 6;
break;
}
dow = dow % 7;
/* update RTC registers and local cache */
RTCDAY = rtca_time.day;
RTCDOW = (rtca_time.dow = dow);
RTCMON = rtca_time.mon;
RTCYEARL = rtca_time.year & 0xff;
RTCYEARH = rtca_time.year >> 8;
/* Resume RTC time keeping */
rtca_start();
#ifdef CONFIG_RTC_DST
/* calculate new DST switch dates */
rtc_dst_calculate_dates(rtca_time.year, rtca_time.mon, rtca_time.day, rtca_time.hour);
#endif
}