decompile rtc

src/rtc.c

@@ -0,0 +1,329 @@
+#include "global.h"
+#include "rtc.h"
+#include "string_util.h"
+#include "text.h"
+
+extern u16 sErrorStatus;
+extern struct SiiRtcInfo sRtc;
+extern u8 sProbeResult;
+extern u16 sSavedIme;
+
+extern struct Time gLocalTime;
+
+extern const struct SiiRtcInfo sRtcDummy;
+
+extern const s32 sNumDaysInMonths[12];
+
+void RtcDisableInterrupts(void)
+{
+    sSavedIme = REG_IME;
+    REG_IME = 0;
+}
+
+void RtcRestoreInterrupts(void)
+{
+    REG_IME = sSavedIme;
+}
+
+u32 ConvertBcdToBinary(u8 bcd)
+{
+    if (bcd > 0x9F)
+        return 0xFF;
+
+    if ((bcd & 0xF) <= 9)
+        return (10 * ((bcd >> 4) & 0xF)) + (bcd & 0xF);
+    else
+        return 0xFF;
+}
+
+bool8 IsLeapYear(u32 year)
+{
+    if ((year % 4 == 0 && year % 100 != 0) || (year % 400 == 0))
+        return TRUE;
+
+    return FALSE;
+}
+
+u16 ConvertDateToDayCount(u8 year, u8 month, u8 day)
+{
+    s32 i;
+    u16 dayCount = 0;
+
+    for (i = year - 1; i >= 0; i--)
+    {
+        dayCount += 365;
+
+        if (IsLeapYear(i) == TRUE)
+            dayCount++;
+    }
+
+    for (i = 0; i < month - 1; i++)
+        dayCount += sNumDaysInMonths[i];
+
+    if (month > MONTH_FEB && IsLeapYear(year) == TRUE)
+        dayCount++;
+
+    dayCount += day;
+
+    return dayCount;
+}
+
+u16 RtcGetDayCount(struct SiiRtcInfo *rtc)
+{
+    u8 year = ConvertBcdToBinary(rtc->year);
+    u8 month = ConvertBcdToBinary(rtc->month);
+    u8 day = ConvertBcdToBinary(rtc->day);
+    return ConvertDateToDayCount(year, month, day);
+}
+
+void RtcInit(void)
+{
+    sErrorStatus = 0;
+
+    RtcDisableInterrupts();
+    SiiRtcUnprotect();
+    sProbeResult = SiiRtcProbe();
+    RtcRestoreInterrupts();
+
+    if ((sProbeResult & 0xF) != 1)
+    {
+        sErrorStatus = RTC_INIT_ERROR;
+        return;
+    }
+
+    if (sProbeResult & 0xF0)
+        sErrorStatus = RTC_INIT_WARNING;
+    else
+        sErrorStatus = 0;
+
+    RtcGetRawInfo(&sRtc);
+    sErrorStatus = RtcCheckInfo(&sRtc);
+}
+
+u16 RtcGetErrorStatus(void)
+{
+    return sErrorStatus;
+}
+
+void RtcGetInfo(struct SiiRtcInfo *rtc)
+{
+    if (sErrorStatus & RTC_ERR_FLAG_MASK)
+        *rtc = sRtcDummy;
+    else
+        RtcGetRawInfo(rtc);
+}
+
+void RtcGetDateTime(struct SiiRtcInfo *rtc)
+{
+    RtcDisableInterrupts();
+    SiiRtcGetDateTime(rtc);
+    RtcRestoreInterrupts();
+}
+
+void RtcGetStatus(struct SiiRtcInfo *rtc)
+{
+    RtcDisableInterrupts();
+    SiiRtcGetStatus(rtc);
+    RtcRestoreInterrupts();
+}
+
+void RtcGetRawInfo(struct SiiRtcInfo *rtc)
+{
+    RtcGetStatus(rtc);
+    RtcGetDateTime(rtc);
+}
+
+u16 RtcCheckInfo(struct SiiRtcInfo *rtc)
+{
+    u16 errorFlags = 0;
+    s32 year;
+    s32 month;
+    s32 value;
+
+    if (rtc->status & SIIRTCINFO_POWER)
+        errorFlags |= RTC_ERR_POWER_FAILURE;
+
+    if (!(rtc->status & SIIRTCINFO_24HOUR))
+        errorFlags |= RTC_ERR_12HOUR_CLOCK;
+
+    year = ConvertBcdToBinary(rtc->year);
+
+    if (year == 0xFF)
+        errorFlags |= RTC_ERR_INVALID_YEAR;
+
+    month = ConvertBcdToBinary(rtc->month);
+
+    if (month == 0xFF || month == 0 || month > 12)
+        errorFlags |= RTC_ERR_INVALID_MONTH;
+
+    value = ConvertBcdToBinary(rtc->day);
+
+    if (value == 0xFF)
+        errorFlags |= RTC_ERR_INVALID_DAY;
+
+    if (month == MONTH_FEB)
+    {
+        if (value > IsLeapYear(year) + sNumDaysInMonths[month - 1])
+            errorFlags |= RTC_ERR_INVALID_DAY;
+    }
+    else
+    {
+        if (value > sNumDaysInMonths[month - 1])
+            errorFlags |= RTC_ERR_INVALID_DAY;
+    }
+
+    value = ConvertBcdToBinary(rtc->hour);
+
+    if (value > 24)
+        errorFlags |= RTC_ERR_INVALID_HOUR;
+
+    value = ConvertBcdToBinary(rtc->minute);
+
+    if (value > 60)
+        errorFlags |= RTC_ERR_INVALID_MINUTE;
+
+    value = ConvertBcdToBinary(rtc->second);
+
+    if (value > 60)
+        errorFlags |= RTC_ERR_INVALID_SECOND;
+
+    return errorFlags;
+}
+
+void RtcReset(void)
+{
+    RtcDisableInterrupts();
+    SiiRtcReset();
+    RtcRestoreInterrupts();
+}
+
+void FormatDecimalTime(u8 *dest, s32 hour, s32 minute, s32 second)
+{
+    dest = ConvertIntToDecimalStringN(dest, hour, STR_CONV_MODE_LEADING_ZEROS, 2);
+    *dest++ = CHAR_COLON;
+    dest = ConvertIntToDecimalStringN(dest, minute, STR_CONV_MODE_LEADING_ZEROS, 2);
+    *dest++ = CHAR_COLON;
+    dest = ConvertIntToDecimalStringN(dest, second, STR_CONV_MODE_LEADING_ZEROS, 2);
+    *dest = EOS;
+}
+
+void FormatHexTime(u8 *dest, s32 hour, s32 minute, s32 second)
+{
+    dest = ConvertIntToHexStringN(dest, hour, STR_CONV_MODE_LEADING_ZEROS, 2);
+    *dest++ = CHAR_COLON;
+    dest = ConvertIntToHexStringN(dest, minute, STR_CONV_MODE_LEADING_ZEROS, 2);
+    *dest++ = CHAR_COLON;
+    dest = ConvertIntToHexStringN(dest, second, STR_CONV_MODE_LEADING_ZEROS, 2);
+    *dest = EOS;
+}
+
+void FormatHexRtcTime(u8 *dest)
+{
+    FormatHexTime(dest, sRtc.hour, sRtc.minute, sRtc.second);
+}
+
+void FormatDecimalDate(u8 *dest, s32 year, s32 month, s32 day)
+{
+    dest = ConvertIntToDecimalStringN(dest, year, STR_CONV_MODE_LEADING_ZEROS, 4);
+    *dest++ = CHAR_HYPHEN;
+    dest = ConvertIntToDecimalStringN(dest, month, STR_CONV_MODE_LEADING_ZEROS, 2);
+    *dest++ = CHAR_HYPHEN;
+    dest = ConvertIntToDecimalStringN(dest, day, STR_CONV_MODE_LEADING_ZEROS, 2);
+    *dest = EOS;
+}
+
+void FormatHexDate(u8 *dest, s32 year, s32 month, s32 day)
+{
+    dest = ConvertIntToHexStringN(dest, year, STR_CONV_MODE_LEADING_ZEROS, 4);
+    *dest++ = CHAR_HYPHEN;
+    dest = ConvertIntToHexStringN(dest, month, STR_CONV_MODE_LEADING_ZEROS, 2);
+    *dest++ = CHAR_HYPHEN;
+    dest = ConvertIntToHexStringN(dest, day, STR_CONV_MODE_LEADING_ZEROS, 2);
+    *dest = EOS;
+}
+
+void RtcCalcTimeDifference(struct SiiRtcInfo *rtc, struct Time *result, struct Time *t)
+{
+    u16 days = RtcGetDayCount(rtc);
+    result->seconds = ConvertBcdToBinary(rtc->second) - t->seconds;
+    result->minutes = ConvertBcdToBinary(rtc->minute) - t->minutes;
+    result->hours = ConvertBcdToBinary(rtc->hour) - t->hours;
+    result->days = days - t->days;
+
+    if (result->seconds < 0)
+    {
+        result->seconds += 60;
+        --result->minutes;
+    }
+
+    if (result->minutes < 0)
+    {
+        result->minutes += 60;
+        --result->hours;
+    }
+
+    if (result->hours < 0)
+    {
+        result->hours += 24;
+        --result->days;
+    }
+}
+
+void RtcCalcLocalTime(void)
+{
+    RtcGetInfo(&sRtc);
+    RtcCalcTimeDifference(&sRtc, &gLocalTime, &gSaveBlock2Ptr->localTimeOffset);
+}
+
+void RtcInitLocalTimeOffset(s32 hour, s32 minute)
+{
+    RtcCalcLocalTimeOffset(0, hour, minute, 0);
+}
+
+void RtcCalcLocalTimeOffset(s32 days, s32 hours, s32 minutes, s32 seconds)
+{
+    gLocalTime.days = days;
+    gLocalTime.hours = hours;
+    gLocalTime.minutes = minutes;
+    gLocalTime.seconds = seconds;
+    RtcGetInfo(&sRtc);
+    RtcCalcTimeDifference(&sRtc, &gSaveBlock2Ptr->localTimeOffset, &gLocalTime);
+}
+
+void CalcTimeDifference(struct Time *result, struct Time *t1, struct Time *t2)
+{
+    result->seconds = t2->seconds - t1->seconds;
+    result->minutes = t2->minutes - t1->minutes;
+    result->hours = t2->hours - t1->hours;
+    result->days = t2->days - t1->days;
+
+    if (result->seconds < 0)
+    {
+        result->seconds += 60;
+        --result->minutes;
+    }
+
+    if (result->minutes < 0)
+    {
+        result->minutes += 60;
+        --result->hours;
+    }
+
+    if (result->hours < 0)
+    {
+        result->hours += 24;
+        --result->days;
+    }
+}
+
+u32 RtcGetMinuteCount(void)
+{
+    RtcGetInfo(&sRtc);
+    return (24 * 60) * RtcGetDayCount(&sRtc) + 60 * sRtc.hour + sRtc.minute;
+}
+
+u16 RtcGetLocalDayCount(void)
+{
+    return RtcGetDayCount(&sRtc);
+}
+