diff options
Diffstat (limited to 'src/rtc.c')
| -rw-r--r-- | src/rtc.c | 349 |
1 files changed, 349 insertions, 0 deletions
diff --git a/src/rtc.c b/src/rtc.c new file mode 100644 index 000000000..6f164066b --- /dev/null +++ b/src/rtc.c @@ -0,0 +1,349 @@ +#include "global.h" +#include "siirtc.h" +#include "rtc.h" +#include "string_util.h" + +extern const struct SiiRtcInfo gRtcDummy; +extern const s32 gNumDaysInMonths[]; + +extern u16 gRtcErrorStatus; +extern struct SiiRtcInfo gRtc; +extern u8 gRtcProbeResult; +extern u16 gRtcSavedIme; + +extern struct Time gLocalTime; + +void RtcDisableInterrupts(); +void RtcRestoreInterrupts(); +u32 ConvertBcdToBinary(u8 bcd); +bool8 IsLeapYear(u8 year); +u16 ConvertDateToDayCount(u8 year, u8 month, u8 day); +u16 RtcGetDayCount(struct SiiRtcInfo *rtc); +void RtcGetInfo(struct SiiRtcInfo *rtc); +void RtcGetDateTime(struct SiiRtcInfo *rtc); +void RtcGetStatus(struct SiiRtcInfo *rtc); +void RtcGetRawInfo(struct SiiRtcInfo *rtc); +u16 RtcCheckInfo(struct SiiRtcInfo *rtc); +void RtcCalcTimeDifference(struct SiiRtcInfo *rtc, struct Time *result, struct Time *t); + +void RtcDisableInterrupts() +{ + gRtcSavedIme = REG_IME; + REG_IME = 0; +} + +void RtcRestoreInterrupts() +{ + REG_IME = gRtcSavedIme; +} + +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(u8 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; + +#if (REVISION < 2) + // Revisions 0 and 1 don't add days for the year 2000, + // causing the berry glitch. + for (i = year - 1; i > 0; i--) + { + dayCount += 365; + + if (IsLeapYear(i) == TRUE) + dayCount++; + } +#else + // Revision 2 has "i >= 0" as the condition instead of "i > 0", + // which fixes the issue. + for (i = year - 1; i >= 0; i--) + { + dayCount += 365; + + if (IsLeapYear(i) == TRUE) + dayCount++; + } +#endif + + for (i = 0; i < month - 1; i++) + dayCount += gNumDaysInMonths[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() +{ + gRtcErrorStatus = 0; + + RtcDisableInterrupts(); + SiiRtcUnprotect(); + gRtcProbeResult = SiiRtcProbe(); + RtcRestoreInterrupts(); + + if (!(gRtcProbeResult & 0xF)) + { + gRtcErrorStatus = RTC_INIT_ERROR; + return; + } + + if (gRtcProbeResult & 0xF0) + gRtcErrorStatus = RTC_INIT_WARNING; + else + gRtcErrorStatus = 0; + + RtcGetRawInfo(&gRtc); + gRtcErrorStatus = RtcCheckInfo(&gRtc); +} + +u16 RtcGetErrorStatus() +{ + return gRtcErrorStatus; +} + +void RtcGetInfo(struct SiiRtcInfo *rtc) +{ + if (gRtcErrorStatus & RTC_ERR_FLAG_MASK) + *rtc = gRtcDummy; + 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) + gNumDaysInMonths[month - 1]) + errorFlags |= RTC_ERR_INVALID_DAY; + } + else + { + if (value > gNumDaysInMonths[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() +{ + 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, gRtc.hour, gRtc.minute, gRtc.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() +{ + RtcGetInfo(&gRtc); + RtcCalcTimeDifference(&gRtc, &gLocalTime, &gSaveBlock2.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(&gRtc); + RtcCalcTimeDifference(&gRtc, &gSaveBlock2.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() +{ + RtcGetInfo(&gRtc); + return (24 * 60) * RtcGetDayCount(&gRtc) + 60 * gRtc.hour + gRtc.minute; +} |