Firmware2/frameworks/CMSIS/LPC1768/lib/chanfs/rtc176x.c

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/*------------------------------------------------------------------------/
/ LPC176x RTC control module
/-------------------------------------------------------------------------/
/
/ Copyright (C) 2011, ChaN, all right reserved.
/
/ * This software is a free software and there is NO WARRANTY.
/ * No restriction on use. You can use, modify and redistribute it for
/ personal, non-profit or commercial products UNDER YOUR RESPONSIBILITY.
/ * Redistributions of source code must retain the above copyright notice.
/
/-------------------------------------------------------------------------*/
#include "rtc176x.h"
int rtc_initialize (void)
{
/* Enable PCLK to the RTC */
__set_PCONP(PCRTC, 1);
/* Start RTC with external XTAL */
RTC_CCR = 0x11;
return 1;
}
int rtc_gettime (RTC *rtc) /* 1:RTC valid, 0:RTC volatiled */
{
DWORD d, t;
do {
t = RTC_CTIME0;
d = RTC_CTIME1;
} while (t != RTC_CTIME0 || d != RTC_CTIME1);
if (RTC_AUX & _BV(4)) { /* If power fail has been detected, return default time. */
rtc->sec = 0; rtc->min = 0; rtc->hour = 0;
rtc->wday = 0; rtc->mday = 1; rtc->month = 1; rtc->year = 2014;
return 0;
}
rtc->sec = t & 63;
rtc->min = (t >> 8) & 63;
rtc->hour = (t >> 16) & 31;
rtc->wday = (t >> 24) & 7;
rtc->mday = d & 31;
rtc->month = (d >> 8) & 15;
rtc->year = (d >> 16) & 4095;
return 1;
}
int rtc_settime (const RTC *rtc)
{
RTC_CCR = 0x12; /* Stop RTC */
/* Update RTC registers */
RTC_SEC = rtc->sec;
RTC_MIN = rtc->min;
RTC_HOUR = rtc->hour;
RTC_DOW = rtc->wday;
RTC_DOM = rtc->mday;
RTC_MONTH = rtc->month;
RTC_YEAR = rtc->year;
RTC_AUX = _BV(4); /* Clear power fail flag */
RTC_CCR = 0x11; /* Restart RTC, Disable calibration feature */
return 1;
}
DWORD get_fattime (void) {
RTC rtc;
/* Get local time */
rtc_gettime(&rtc);
/* Pack date and time into a DWORD variable */
return ((DWORD)(rtc.year - 1980) << 25)
| ((DWORD)rtc.month << 21)
| ((DWORD)rtc.mday << 16)
| ((DWORD)rtc.hour << 11)
| ((DWORD)rtc.min << 5)
| ((DWORD)rtc.sec >> 1);
}