RIOT/cpu/cc430/cc430-rtc.c

/******************************************************************************
Copyright 2010, Freie Universitaet Berlin (FUB). All rights reserved.

These sources were developed at the Freie Universitaet Berlin, Computer Systems
and Telematics group (http://cst.mi.fu-berlin.de).
-------------------------------------------------------------------------------
This file is part of RIOT.

This program is free software: you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free Software
Foundation, either version 3 of the License, or (at your option) any later
version.

RIOT is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with
this program.  If not, see http://www.gnu.org/licenses/ .
--------------------------------------------------------------------------------
For further information and questions please use the web site
	http://scatterweb.mi.fu-berlin.de
and the mailinglist (subscription via web site)
	scatterweb@lists.spline.inf.fu-berlin.de
*******************************************************************************/

/**
 * @ingroup rtc
 */

#include <string.h>
#include <legacymsp430.h>
#include <irq.h>
#include <cpu.h>
#include <cc430f6137.h>
#include <cc430-rtc.h>

//static volatile time_t epoch;
static struct tm time_to_set;
static int set_time = 0;
int rtc_second_pid = 0;

/*---------------------------------------------------------------------------*/
void rtc_init(void) {
    /* Set to calendar mode */
    RTCCTL1 |= RTCMODE_H;

    /* enable ready interrupt (every second) */
#ifndef ENABLE_DEBUG
    RTCCTL0 |= RTCRDYIE;
#endif
}

/*---------------------------------------------------------------------------*/
void rtc_enable(void) {
    /* Set RTC operational */
    RTCCTL1 &= ~RTCHOLD_H;
}
/*---------------------------------------------------------------------------*/
void rtc_disable(void) {
    /* Stop RTC */
    RTCCTL1 |= RTCHOLD_H;
}
/*---------------------------------------------------------------------------*/
void rtc_set_localtime(struct tm* localt) {
	if(localt == NULL) {
		return;
    }

    /* copy time to be set */
    memcpy(&time_to_set, localt, sizeof(struct tm));
    /* set interrupt to set this time after the next transition */
//    RTCCTL0 |= RTCRDYIE;
    set_time = 1;
}

/*---------------------------------------------------------------------------
void rtc_set(time_t time) {
	struct tm* localt;
	localt = localtime(&time);						// convert seconds to broken-down time
	rtc_set_localtime(localt);
	epoch = time - localt->tm_sec - localt->tm_min * 60;
}
*/

/*---------------------------------------------------------------------------
time_t rtc_time(void) {
    time_t sec;
    struct tm t;
    rtc_get_localtime(&t);
    sec = mktime(&t);
	return sec;
}
*/
/*---------------------------------------------------------------------------*/
void rtc_get_localtime(struct tm* localt) {
    uint8_t success = 0;
    uint8_t i;
    uint16_t tmpyear;

	if( localt == NULL ) {
        return;
    }

    while (!success) {
        for (i = 0; i < 8; i++) {
            /* try again when RTC is in transition */
            if (!(RTCCTL1 & RTCRDY_H)) {
                break;
            }
            switch (i) {
                case 0:
                    localt->tm_sec = RTCSEC;
                    break;
                case 1:
                    localt->tm_min = RTCMIN;
                    break;
                case 2:
                    localt->tm_hour = RTCHOUR;
                    break;
                case 3:
                    localt->tm_mday = RTCDAY;
                    break;
                case 4:
                    localt->tm_wday = RTCDOW;
                    break;
                case 5:
                    localt->tm_mon = RTCMON - 1;
                    break;
                case 6:
                    tmpyear = RTCYEARL;
                    tmpyear |= (RTCYEARH << 0x08);
                    localt->tm_year = tmpyear - 1900;
                    break;
                default:
                    success = 1;
                    break;
            }
        }
    }
}

/*---------------------------------------------------------------------------*/
void rtc_set_alarm(struct tm* localt, rtc_alarm_mask_t mask) {
    if (mask & RTC_ALARM_MIN) {
        RTCAMIN = localt->tm_min;
        RTCAMIN |= BIT7;
    }
    if (mask & RTC_ALARM_HOUR) {
        RTCAHOUR = localt->tm_hour;
        RTCAHOUR |= BIT7;
    }
    if (mask & RTC_ALARM_DOW) {
        RTCADOW = localt->tm_wday;
        RTCADOW |= BIT7;
    }
    if (mask & RTC_ALARM_DOM) {
        RTCADAY = localt->tm_mday;
        RTCADAY |= BIT7;
    }
    RTCCTL0 |= RTCAIE;
}

/*---------------------------------------------------------------------------*/
void rtc_remove_alarm(void) {
    /* reset all AE bits */
    RTCAHOUR &= ~BIT7;
    RTCAMIN  &= ~BIT7;
    RTCADAY  &= ~BIT7;
    RTCADOW  &= ~BIT7;

    /* reset alarm interrupt enable */
    RTCCTL0 &= ~RTCAIE;
}
/*---------------------------------------------------------------------------*/
interrupt(RTC_VECTOR) __attribute__ ((naked)) rtc_isr(void) {
    __enter_isr();
    /* RTC is save to write for up to one second now */
    if (RTCIV == RTC_RTCRDYIFG) {
        /* disable interrupt */
        //RTCCTL0 &= ~RTCRDYIE;

        if (set_time) {
            set_time = 0;
        /* set previous set time and reset it */
            RTCSEC = time_to_set.tm_sec;
            RTCMIN = time_to_set.tm_min;
            RTCHOUR = time_to_set.tm_hour;
            RTCDAY = time_to_set.tm_mday;
            RTCDOW = time_to_set.tm_wday;
            RTCMON = time_to_set.tm_mon + 1;
            RTCYEARL = (time_to_set.tm_year + 1900) & 0xFF;
            RTCYEARH = (time_to_set.tm_year + 1900) >> 0x08;
        }
        if (rtc_second_pid) {
            msg_t m;
            m.type = RTC_SECOND;
            msg_send_int(&m, rtc_second_pid);
        }
    }
    /* RTC alarm */
    else if (RTCIV == RTC_RTCAIFG) {
    }
    __exit_isr();
}