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stm32-multi: rtc: add functionality for subseconds #302

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stm32-multi: rtc: add functionality for subseconds #302

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83 changes: 74 additions & 9 deletions multi/stm32l4-multi/rtc.c
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Original file line number Diff line number Diff line change
Expand Up @@ -139,6 +139,64 @@ void rtc_setCalib(int value)
}


inline static void setSubseconds(rtctimestamp_t *timestamp, unsigned int ssec)
{
unsigned int prev_month_days, prev_month, carry = 0;
const unsigned int month_days[12] = { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };

timestamp->usecs = ((uint64_t)(rtc_common.prediv_s - (ssec & 0xffff)) * 1000 * 1000) / (rtc_common.prediv_s + 1);

if (ssec > rtc_common.prediv_s) {
timestamp->usecs = ((uint64_t)(2 * rtc_common.prediv_s - (ssec & 0xffff)) * 1000 * 1000) / (rtc_common.prediv_s + 1);
carry = 1;
}
if (carry <= timestamp->seconds) {
timestamp->seconds = (60 + timestamp->seconds - carry) % 60;
carry = 0;
}
else {
timestamp->seconds = (60 + timestamp->seconds - carry) % 60;
}

if (carry <= timestamp->minutes) {
timestamp->minutes = (60 + timestamp->minutes - carry) % 60;
carry = 0;
}
else {
timestamp->minutes = (60 + timestamp->minutes - carry) % 60;
}
if (carry <= timestamp->hours) {
timestamp->hours = (24 + timestamp->hours - carry) % 24;
carry = 0;
}
else {
timestamp->hours = (24 + timestamp->hours - carry) % 24;
}

prev_month = (11 + timestamp->month) % 12;
prev_month_days = month_days[prev_month];
if (prev_month == 2 && ((timestamp->year % 4 == 0 && timestamp->year % 100 != 0) || timestamp->year % 400 == 0)) {
prev_month_days++;
}

timestamp->wday = (7 + timestamp->wday - carry) % 7;
if (carry <= timestamp->day) {
timestamp->day = (prev_month_days + timestamp->day - carry) % prev_month_days;
carry = 0;
}
else {
timestamp->day = (prev_month_days + timestamp->day - carry) % prev_month_days;
}
if (carry <= timestamp->month) {
carry = 0;
}
else {
timestamp->month = (12 + timestamp->month - carry) % 12;
}
timestamp->year = timestamp->year - carry;
}


int rtc_getTime(rtctimestamp_t *timestamp)
{
unsigned int ssec, time, date, ssec2, time2, date2;
Expand All @@ -161,23 +219,23 @@ int rtc_getTime(rtctimestamp_t *timestamp)
date = date2;
}

timestamp->usecs = ((uint64_t) (rtc_common.prediv_s - (ssec & 0xffff)) * 1000 * 1000) / (rtc_common.prediv_s + 1);
timestamp->wday = (date >> 13) & 0x7;
timestamp->year = rtc_bcdToBin((date >> 16) & 0xff);
timestamp->month = rtc_bcdToBin((date >> 8) & 0x1f);
timestamp->day = rtc_bcdToBin(date & 0x3f);
timestamp->hours = rtc_bcdToBin((time >> 16) & 0x3f);
timestamp->minutes = rtc_bcdToBin((time >> 8) & 0x7f);
timestamp->seconds = rtc_bcdToBin(time & 0x7f);

timestamp->day = rtc_bcdToBin(date & 0x3f);
timestamp->month = rtc_bcdToBin((date >> 8) & 0x1f);
timestamp->year = rtc_bcdToBin((date >> 16) & 0xff);
timestamp->wday = (date >> 13) & 0x7;
setSubseconds(timestamp, ssec);

return EOK;
}


int rtc_setTime(rtctimestamp_t *timestamp)
{
unsigned int time, date;
unsigned int time, date, ssec;

time = timestampToTime(timestamp);
date = timestampToDate(timestamp);
Expand All @@ -188,13 +246,20 @@ int rtc_setTime(rtctimestamp_t *timestamp)
if (!(*(rtc_common.base + isr) & (1 << 6))) {
*(rtc_common.base + isr) |= (1 << 7);
dataBarier();
while (!(*(rtc_common.base + isr) & (1 << 6)));
while (!(*(rtc_common.base + isr) & (1 << 6)))
;
}

ssec = *(rtc_common.base + ssr) & 0xffff;
ssec = ((uint64_t)(rtc_common.prediv_s - ssec) * 1000 * 1000) / (rtc_common.prediv_s + 1);
/*Setting TR has a side effect of changing SSR value to prediv_s*/
*(rtc_common.base + tr) = time;
*(rtc_common.base + dr) = date;

*(rtc_common.base + isr) &= ~(1 << 7);
while ((*(rtc_common.base + isr) & (1 << 3)))
;
*(rtc_common.base + shiftr) = ((1000 * 1000 - timestamp->usecs) * (rtc_common.prediv_s + 1) / (1000 * 1000)) | (1 << 31);
while ((*(rtc_common.base + isr) & (1 << 3)))
;

_rtc_lock();
mutexUnlock(rtc_common.lock);
Expand Down