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