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rtc: Add epoch convertion functions

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Thanks @shchmue for the HOS conversion
This commit is contained in:
CTCaer 2019-12-14 22:27:07 +02:00
parent 7604239237
commit 2aaa0331ac
4 changed files with 190 additions and 2 deletions
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94
bootloader/rtc/max77620-rtc.c
View File

@ -1,7 +1,8 @@
/*
* PMIC Real Time Clock driver for Nintendo Switch's MAX77620-RTC
*
* Copyright (c) 2018 CTCaer
* Copyright (c) 2018-2019 CTCaer
* Copyright (c) 2019 shchmue
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
@ -75,3 +76,94 @@ void max77620_rtc_stop_alarm()
// Update RTC clock from RTC regs.
i2c_send_byte(I2C_5, MAX77620_RTC_I2C_ADDR, MAX77620_RTC_UPDATE0_REG, MAX77620_RTC_WRITE_UPDATE);
}
void max77620_rtc_epoch_to_date(u32 epoch, rtc_time_t *time)
{
u32 tmp, edays, year, month, day;
// Set time.
time->sec = epoch % 60;
epoch /= 60;
time->min = epoch % 60;
epoch /= 60;
time->hour = epoch % 24;
epoch /= 24;
// Calculate base date values.
tmp = (u32)(((u64)4 * epoch + 102032) / 146097 + 15);
tmp = (u32)((u64)epoch + 2442113 + tmp - (tmp >> 2));
year = (20 * tmp - 2442) / 7305;
edays = tmp - 365 * year - (year >> 2);
month = edays * 1000 / 30601;
day = edays - month * 30 - month * 601 / 1000;
// Month/Year offset.
if(month < 14)
{
year -= 4716;
month--;
}
else
{
year -= 4715;
month -= 13;
}
// Set date.
time->year = year;
time->month = month;
time->day = day;
// Set weekday.
time->weekday = 0; //! TODO.
}
u32 max77620_rtc_date_to_epoch(const rtc_time_t *time, bool hos_encoding)
{
u32 year, month, epoch;
//Year
year = time->year;
//Month of year
month = time->month;
if (!hos_encoding)
{
// Month/Year offset.
if(month < 3)
{
month += 12;
year--;
}
}
else
{
year -= 2000;
month++;
// Month/Year offset.
if(month < 3)
{
month += 9;
year--;
}
else
month -= 3;
}
epoch = (365 * year) + (year >> 2) - (year / 100) + (year / 400); // Years to days.
if (!hos_encoding)
{
epoch += (30 * month) + (3 * (month + 1) / 5) + time->day; // Months to days.
epoch -= 719561; // Epoch time is 1/1/1970.
}
else
epoch += (30 * month) + ((3 * month + 2) / 5) + 59 + time->day; // Months to days.
epoch *= 86400; // Days to seconds.
epoch += (3600 * time->hour) + (60 * time->min) + time->sec; // Add hours, minutes and seconds.
return epoch;
}

2
bootloader/rtc/max77620-rtc.h
View File

@ -71,5 +71,7 @@ typedef struct _rtc_time_t {
void max77620_rtc_get_time(rtc_time_t *time);
void max77620_rtc_stop_alarm();
void max77620_rtc_epoch_to_date(u32 epoch, rtc_time_t *time);
u32 max77620_rtc_date_to_epoch(const rtc_time_t *time, bool hos_encoding);
#endif /* _MFD_MAX77620_RTC_H_ */

94
nyx/nyx_gui/rtc/max77620-rtc.c
View File

@ -1,7 +1,8 @@
/*
* PMIC Real Time Clock driver for Nintendo Switch's MAX77620-RTC
*
* Copyright (c) 2018 CTCaer
* Copyright (c) 2018-2019 CTCaer
* Copyright (c) 2019 shchmue
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
@ -75,3 +76,94 @@ void max77620_rtc_stop_alarm()
// Update RTC clock from RTC regs.
i2c_send_byte(I2C_5, MAX77620_RTC_I2C_ADDR, MAX77620_RTC_UPDATE0_REG, MAX77620_RTC_WRITE_UPDATE);
}
void max77620_rtc_epoch_to_date(u32 epoch, rtc_time_t *time)
{
u32 tmp, edays, year, month, day;
// Set time.
time->sec = epoch % 60;
epoch /= 60;
time->min = epoch % 60;
epoch /= 60;
time->hour = epoch % 24;
epoch /= 24;
// Calculate base date values.
tmp = (u32)(((u64)4 * epoch + 102032) / 146097 + 15);
tmp = (u32)((u64)epoch + 2442113 + tmp - (tmp >> 2));
year = (20 * tmp - 2442) / 7305;
edays = tmp - 365 * year - (year >> 2);
month = edays * 1000 / 30601;
day = edays - month * 30 - month * 601 / 1000;
// Month/Year offset.
if(month < 14)
{
year -= 4716;
month--;
}
else
{
year -= 4715;
month -= 13;
}
// Set date.
time->year = year;
time->month = month;
time->day = day;
// Set weekday.
time->weekday = 0; //! TODO.
}
u32 max77620_rtc_date_to_epoch(const rtc_time_t *time, bool hos_encoding)
{
u32 year, month, epoch;
//Year
year = time->year;
//Month of year
month = time->month;
if (!hos_encoding)
{
// Month/Year offset.
if(month < 3)
{
month += 12;
year--;
}
}
else
{
year -= 2000;
month++;
// Month/Year offset.
if(month < 3)
{
month += 9;
year--;
}
else
month -= 3;
}
epoch = (365 * year) + (year >> 2) - (year / 100) + (year / 400); // Years to days.
if (!hos_encoding)
{
epoch += (30 * month) + (3 * (month + 1) / 5) + time->day; // Months to days.
epoch -= 719561; // Epoch time is 1/1/1970.
}
else
epoch += (30 * month) + ((3 * month + 2) / 5) + 59 + time->day; // Months to days.
epoch *= 86400; // Days to seconds.
epoch += (3600 * time->hour) + (60 * time->min) + time->sec; // Add hours, minutes and seconds.
return epoch;
}

2
nyx/nyx_gui/rtc/max77620-rtc.h
View File

@ -71,5 +71,7 @@ typedef struct _rtc_time_t {
void max77620_rtc_get_time(rtc_time_t *time);
void max77620_rtc_stop_alarm();
void max77620_rtc_epoch_to_date(u32 epoch, rtc_time_t *time);
u32 max77620_rtc_date_to_epoch(const rtc_time_t *time, bool hos_encoding);
#endif /* _MFD_MAX77620_RTC_H_ */