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/*
* @brief RTC tick to (a more) Universal Time
* Adds conversion functions to use an RTC that only provides a
* seconds capability to provide "struct tm" support.
*
* @note
* Copyright(C) NXP Semiconductors, 2014
* All rights reserved.
*
* @par
* Software that is described herein is for illustrative purposes only
* which provides customers with programming information regarding the
* LPC products. This software is supplied "AS IS" without any warranties of
* any kind, and NXP Semiconductors and its licensor disclaim any and
* all warranties, express or implied, including all implied warranties of
* merchantability, fitness for a particular purpose and non-infringement of
* intellectual property rights. NXP Semiconductors assumes no responsibility
* or liability for the use of the software, conveys no license or rights under any
* patent, copyright, mask work right, or any other intellectual property rights in
* or to any products. NXP Semiconductors reserves the right to make changes
* in the software without notification. NXP Semiconductors also makes no
* representation or warranty that such application will be suitable for the
* specified use without further testing or modification.
*
* @par
* Permission to use, copy, modify, and distribute this software and its
* documentation is hereby granted, under NXP Semiconductors' and its
* licensor's relevant copyrights in the software, without fee, provided that it
* is used in conjunction with NXP Semiconductors microcontrollers. This
* copyright, permission, and disclaimer notice must appear in all copies of
* this code.
*/
#include "rtc_ut.h"
/*****************************************************************************
* Private types/enumerations/variables
****************************************************************************/
#define SECSPERMIN (60)
#define MINSPERHOUR (60)
#define SECSPERHOUR (SECSPERMIN * MINSPERHOUR)
#define HOURSPERDAY (24)
#define SECSPERDAY (SECSPERMIN * MINSPERHOUR * HOURSPERDAY)
#define DAYSPERWEEK (7)
#define MONETHSPERYEAR (12)
#define DAYSPERYEAR (365)
#define DAYSPERLEAPYEAR (366)
/* Days per month, LY is special */
static uint8_t daysPerMonth[2][MONETHSPERYEAR] = {
{31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31}, /* Normal year */
{31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31}, /* Leap year */
};
/*****************************************************************************
* Public types/enumerations/variables
****************************************************************************/
/*****************************************************************************
* Private functions
****************************************************************************/
/* Converts the number of days offset from the start year to real year
data accounting for leap years */
static void GetDMLY(int dayOff, struct tm *pTime)
{
bool YearFound = false;
int daysYear = dayOff;
int leapYear, curLeapYear, year = TM_YEAR_BASE, monthYear = 0;
bool MonthFound = false;
/* Leap year check for less than 1 year time */
if ((year % 4) == 0) {
curLeapYear = 1;
}
else {
curLeapYear = 0;
}
/* Determine offset of years from days offset */
while (YearFound == false) {
if ((year % 4) == 0) {
/* Leap year, 366 days */
daysYear = DAYSPERLEAPYEAR;
leapYear = 1;
}
else {
/* Leap year, 365 days */
daysYear = DAYSPERYEAR;
leapYear = 0;
}
if (dayOff > daysYear) {
dayOff -= daysYear;
year++;
}
else {
YearFound = true;
curLeapYear = leapYear; /* In a leap year */
}
}
/* Save relative year and day into year */
pTime->tm_year = year - TM_YEAR_BASE; /* Base year relative */
pTime->tm_yday = dayOff;/* 0 relative */
/* Determine offset of months from days offset */
while (MonthFound == false) {
if ((dayOff + 1) > daysPerMonth[curLeapYear][monthYear]) {
/* Next month */
dayOff -= daysPerMonth[curLeapYear][monthYear];
monthYear++;
}
else {
/* Month found */
MonthFound = true;
}
}
pTime->tm_mday = dayOff + 1;/* 1 relative */
pTime->tm_mon = monthYear; /* 0 relative */
}
/*****************************************************************************
* Public functions
****************************************************************************/
/* Converts an RTC tick time to Universal time */
void ConvertRtcTime(uint32_t rtcTick, struct tm *pTime)
{
int daySeconds, dayNum;
/* Get day offset and seconds since start */
dayNum = (int) (rtcTick / SECSPERDAY);
daySeconds = (int) (rtcTick % SECSPERDAY);
/* Fill in secs, min, hours */
pTime->tm_sec = daySeconds % 60;
pTime->tm_hour = daySeconds / SECSPERHOUR;
pTime->tm_min = (daySeconds - (pTime->tm_hour * SECSPERHOUR)) / SECSPERMIN;
/* Weekday, 0 = Sunday, 6 = Saturday */
pTime->tm_wday = (dayNum + TM_DAYOFWEEK) % DAYSPERWEEK;
/* Get year, month, day of month, and day of year */
GetDMLY(dayNum, pTime);
/* Not supported in this driver */
pTime->tm_isdst = 0;
}
/* Converts a Universal time to RTC tick time */
void ConvertTimeRtc(struct tm *pTime, uint32_t *rtcTick)
{
int leapYear, year = pTime->tm_year + TM_YEAR_BASE;
uint32_t dayOff, monthOff, monthCur, rtcTicks = 0;
/* Leap year check for less than 1 year time */
if ((year % 4) == 0) {
leapYear = 1;
}
else {
leapYear = 0;
}
/* Add days for each year and leap year */
while (year > TM_YEAR_BASE) {
if ((year % 4) == 0) {
/* Leap year, 366 days */
rtcTicks += DAYSPERLEAPYEAR * SECSPERDAY;
leapYear = 1;
}
else {
/* Leap year, 365 days */
rtcTicks += DAYSPERYEAR * SECSPERDAY;
leapYear = 0;
}
year--;
}
/* Day and month are 0 relative offsets since day and month
start at 1 */
dayOff = (uint32_t) pTime->tm_mday - 1;
monthOff = (uint32_t) pTime->tm_mon;
/* Add in seconds for passed months */
for (monthCur = 0; monthCur < monthOff; monthCur++) {
rtcTicks += (uint32_t) (daysPerMonth[leapYear][monthCur] * SECSPERDAY);
}
/* Add in seconds for day offset into the current month */
rtcTicks += (dayOff * SECSPERDAY);
/* Add in seconds for hours, minutes, and seconds */
rtcTicks += (uint32_t) (pTime->tm_hour * SECSPERHOUR);
rtcTicks += (uint32_t) (pTime->tm_min * SECSPERMIN);
rtcTicks += (uint32_t) pTime->tm_sec;
*rtcTick = rtcTicks;
}
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