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add functions such as GregorianDay and rt_rtc_time_to_tm 

git-svn-id: https://rt-thread.googlecode.com/svn/trunk@513 bbd45198-f89e-11dd-88c7-29a3b14d5316
This commit is contained in:
gary.li.wenchao.4 2010-03-18 13:26:42 +00:00
parent dd829e747c
commit d1fe6cff06
2 changed files with 97 additions and 8 deletions
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81
libcpu/arm/s3c24x0/rtc.c
View File

@ -10,6 +10,8 @@
* Change Logs:
* Date Author Notes
* 2009-04-26 yi.qiu first version
* 2010-03-18 Gary Lee add functions such as GregorianDay
* and rt_rtc_time_to_tm
*/
#include <rtthread.h>
@ -94,6 +96,85 @@ void rt_hw_rtc_reset (void)
RTCCON &= ~(0x08|0x01);
}
/*
* This only works for the Gregorian calendar - i.e. after 1752 (in the UK)
*/
void GregorianDay(struct rtc_time * tm)
{
int leapsToDate;
int lastYear;
int day;
int MonthOffset[] = { 0,31,59,90,120,151,181,212,243,273,304,334 };
lastYear=tm->tm_year-1;
/*
* Number of leap corrections to apply up to end of last year
*/
leapsToDate = lastYear/4 - lastYear/100 + lastYear/400;
/*
* This year is a leap year if it is divisible by 4 except when it is
* divisible by 100 unless it is divisible by 400
*
* e.g. 1904 was a leap year, 1900 was not, 1996 is, and 2000 will be
*/
if((tm->tm_year%4==0) &&
((tm->tm_year%100!=0) || (tm->tm_year%400==0)) &&
(tm->tm_mon>2)) {
/*
* We are past Feb. 29 in a leap year
*/
day=1;
} else {
day=0;
}
day += lastYear*365 + leapsToDate + MonthOffset[tm->tm_mon-1] + tm->tm_mday;
tm->tm_wday=day%7;
}
void rt_rtc_time_to_tm(rt_uint32_t tim, struct rtc_time *tm)
{
register int i;
register long hms, day;
day = tim / SECDAY;
hms = tim % SECDAY;
/* Hours, minutes, seconds are easy */
tm->tm_hour = hms / 3600;
tm->tm_min = (hms % 3600) / 60;
tm->tm_sec = (hms % 3600) % 60;
/* Number of years in days */
for (i = STARTOFTIME; day >= days_in_year(i); i++) {
day -= days_in_year(i);
}
tm->tm_year = i;
/* Number of months in days left */
if (LEAP_YEAR(tm->tm_year)) {
days_in_month(FEBRUARY) = 29;
}
for (i = 1; day >= days_in_month(i); i++) {
day -= days_in_month(i);
}
days_in_month(FEBRUARY) = 28;
tm->tm_mon = i;
/* Days are what is left over (+1) from all that. */
tm->tm_mday = day + 1;
/*
* Determine the day of week
*/
GregorianDay(tm);
}
static struct rt_device rtc;
static rt_err_t rt_rtc_open(rt_device_t dev, rt_uint16_t oflag)
{

24
libcpu/arm/s3c24x0/rtc.h
View File

@ -8,16 +8,23 @@
#define RTC_DEBUG
#define RTC_ENABLE() (RTCCON |= 0x01) //RTC read and write enable
#define RTC_DISABLE() (RTCCON &= ~0x01) //RTC read and write disable
#define RTC_ENABLE() (RTCCON |= 0x01) //RTC read and write enable
#define RTC_DISABLE() (RTCCON &= ~0x01) //RTC read and write disable
#define BCD2BIN(n) (((((n) >> 4) & 0x0F) * 10) + ((n) & 0x0F))
#define BIN2BCD(n) ((((n) / 10) << 4) | ((n) % 10))
#define BCD2BIN(n) (((((n) >> 4) & 0x0F) * 10) + ((n) & 0x0F))
#define BIN2BCD(n) ((((n) / 10) << 4) | ((n) % 10))
#define LEAPS_THRU_END_OF(y) ((y)/4 - (y)/100 + (y)/400)
#define LEAP_YEAR(year) ((!(year % 4) && (year % 100)) || !(year % 400))
#define LEAPS_THRU_END_OF(y) ((y)/4 - (y)/100 + (y)/400)
#define LEAP_YEAR(year) ((!(year % 4) && (year % 100)) || !(year % 400))
static const unsigned char days_in_month[] =
#define FEBRUARY 2
#define STARTOFTIME 1970
#define SECDAY 86400L
#define SECYR (SECDAY * 365)
#define days_in_year(a) (LEAP_YEAR(a) ? 366 : 365)
#define days_in_month(a) (month_days[(a) - 1])
static unsigned char month_days[] =
{
31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31
};
@ -38,6 +45,7 @@ struct rtc_time
void rt_hw_rtc_get (struct rtc_time *tmp);
void rt_hw_rtc_set (struct rtc_time *tmp);
void rt_hw_rtc_reset (void);
void rt_rtc_time_to_tm(rt_uint32_t time, struct tm *tm);
void GregorianDay (struct rtc_time *);
void rt_rtc_time_to_tm(rt_uint32_t tim, struct rtc_time *tm);
#endif