pcf8563.c

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/*
 * Copyright (C) 2006 by egnite Software GmbH. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the copyright holders nor the names of
 *    contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY EGNITE SOFTWARE GMBH AND CONTRIBUTORS
 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL EGNITE
 * SOFTWARE GMBH OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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 * THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 * For additional information see http://www.ethernut.de/
 *
 */

#include <cfg/os.h>
#include <dev/twif.h>
#include <sys/event.h>
#include <sys/timer.h>

#include <time.h>
#include <stdlib.h>
#include <string.h>

#include <dev/pcf8563.h>

#ifndef I2C_SLA_RTC
#define I2C_SLA_RTC     0x51
#endif

static uint32_t rtc_status;

int PcfRtcReadRegs(uint8_t reg, uint8_t *buff, size_t cnt)
{
    int rc = -1;

    if (TwMasterTransact(I2C_SLA_RTC, &reg, 1, buff, cnt, NUT_WAIT_INFINITE) == cnt) {
        rc = 0;
    }
    return rc;
}

int PcfRtcWrite(int nv, CONST uint8_t *buff, size_t cnt)
{
    return TwMasterTransact(I2C_SLA_RTC, buff, cnt, 0, 0, NUT_WAIT_INFINITE);
}

int PcfRtcGetClock(struct _tm *tm)
{
    int rc;
    uint8_t data[7];

    if ((rc = PcfRtcReadRegs(0x02, data, 7)) == 0) {
        tm->tm_sec = BCD2BIN(data[0] & 0x7F);
        tm->tm_min = BCD2BIN(data[1] & 0x7F);
        tm->tm_hour = BCD2BIN(data[2] & 0x3F);
        tm->tm_mday = BCD2BIN(data[3] & 0x3F);
        tm->tm_mon = BCD2BIN(data[5] & 0x1F) - 1;
        tm->tm_year = BCD2BIN(data[6]);
        if (data[5] & 0x80) {
            tm->tm_year += 100;
        }
        tm->tm_wday = data[4] & 0x07;
    }
    return rc;
}

int PcfRtcSetClock(CONST struct _tm *tm)
{
    uint8_t data[8];

    memset(data, 0, sizeof(data));
    if (tm) {
        data[0] = 0x02;
        data[1] = BIN2BCD(tm->tm_sec);
        data[2] = BIN2BCD(tm->tm_min);
        data[3] = BIN2BCD(tm->tm_hour);
        data[4] = BIN2BCD(tm->tm_mday);
        data[5] = tm->tm_wday;
        data[6] = BIN2BCD(tm->tm_mon + 1);
        if (tm->tm_year > 99) {
            data[7] = BIN2BCD(tm->tm_year - 100);
            data[6] |= 0x80;
        }
        else {
            data[7] = BIN2BCD(tm->tm_year);
        }
    }
    return PcfRtcWrite(0, data, 8);
}

int PcfRtcGetAlarm(int idx, struct _tm *tm, int *aflgs)
{
    return -1;
}

int PcfRtcSetAlarm(int idx, CONST struct _tm *tm, int aflgs)
{
    return -1;
}

int PcfRtcGetStatus(uint32_t *sflgs)
{
    int rc;
    uint8_t data;

    if ((rc = PcfRtcReadRegs(0x02, &data, 1)) == 0) {
        if (data & 0x80) {
            rtc_status = RTC_STATUS_PF;
        }
        *sflgs = rtc_status;
    }
    return rc;
}

int PcfRtcClearStatus(uint32_t sflgs)
{
    rtc_status &= ~sflgs;

    return 0;
}

int PcfRtcInit(void)
{
    int rc;
    uint32_t tmp;

    if ((rc = TwInit(0)) == 0) {
        rc = PcfRtcGetStatus(&tmp);
    }
    return rc;
}

NUTRTC rtcPcf8563 = {
    PcfRtcInit,         
    PcfRtcGetClock,     
    PcfRtcSetClock,     
    PcfRtcGetAlarm,     
    PcfRtcSetAlarm,     
    PcfRtcGetStatus,    
    PcfRtcClearStatus   
};