rtc.h

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// Copyright (c) 2014, 임경현 (dlarudgus20)
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// * Redistributions of source code must retain the above copyright notice, this
//   list of conditions and the following disclaimer.
//
// * 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.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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 THE COPYRIGHT HOLDER 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,
// OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

#ifndef RTC_H_
#define RTC_H_

#include <stddef.h>
#include <stdint.h>

enum
{
    RTC_CMOSADDRESS         = 0x70,
    RTC_CMOSDATA            = 0x71,

    RTC_ADDRESS_SECOND      = 0x00,
    RTC_ADDRESS_MINUTE      = 0x02,
    RTC_ADDRESS_HOUR        = 0x04,
    RTC_ADDRESS_DAYOFWEEK   = 0x06,
    RTC_ADDRESS_DAYOFMONTH  = 0x07,
    RTC_ADDRESS_MONTH       = 0x08,
    RTC_ADDRESS_YEAR        = 0x09,
    RTC_ADDRESS_STATUS_A    = 0x0a,
    RTC_ADDRESS_STATUS_B    = 0x0b,
    RTC_ADDRESS_STATUS_C    = 0x0c,
    RTC_ADDRESS_STATUS_D    = 0x0d,
};

typedef struct tagRTCTime
{
    uint8_t hour, minute, second;
} RTCTime;

typedef struct tagRTCDate
{
    uint16_t year;
    uint8_t month, dayofmonth, dayofweek;
} RTCDate;

static inline uint8_t ckBCD8toBinary(uint8_t b)
{
    return ((b >> 4) * 10) + (b & 0x0f);
}

void ckRTCInitialize(void);

void ckRTCReadTime(RTCTime *pTime);
void ckRTCReadDate(RTCDate *pDate);

const char *ckRTCDayOfWeekStr(uint8_t dayofweek);

#endif /* RTC_H_ */