diff options
| author | gary.li.wenchao.4 <[email protected]> | 2010-03-18 13:26:42 +0000 |
|---|---|---|
| committer | gary.li.wenchao.4 <[email protected]> | 2010-03-18 13:26:42 +0000 |
| commit | d1fe6cff066ed4af69fb5966bd4d74c43d9c0b30 (patch) | |
| tree | 6e557366bb25905547a4231374735f566b733732 | |
| parent | dd829e747c525b05858136ffc39cdeb095baaf6f (diff) | |
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
| -rw-r--r-- | libcpu/arm/s3c24x0/rtc.c | 81 | ||||
| -rw-r--r-- | libcpu/arm/s3c24x0/rtc.h | 24 |
2 files changed, 97 insertions, 8 deletions
diff --git a/libcpu/arm/s3c24x0/rtc.c b/libcpu/arm/s3c24x0/rtc.c index c3251de57c..adb51551e5 100644 --- a/libcpu/arm/s3c24x0/rtc.c +++ b/libcpu/arm/s3c24x0/rtc.c @@ -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)
{
diff --git a/libcpu/arm/s3c24x0/rtc.h b/libcpu/arm/s3c24x0/rtc.h index 0541adec6a..f751008ea1 100644 --- a/libcpu/arm/s3c24x0/rtc.h +++ b/libcpu/arm/s3c24x0/rtc.h @@ -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
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