mirror of
https://github.com/d0k3/GodMode9.git
synced 2025-06-26 13:42:47 +00:00
43 lines
1.4 KiB
C
43 lines
1.4 KiB
C
#include "rtc.h"
|
|
#include "i2c.h"
|
|
|
|
bool is_valid_dstime(DsTime* dstime) {
|
|
// check the time...
|
|
if ((DSTIMEGET(dstime, bcd_h) >= 24) ||
|
|
(DSTIMEGET(dstime, bcd_m) >= 60) ||
|
|
(DSTIMEGET(dstime, bcd_s) >= 60))
|
|
return false;
|
|
|
|
// check the date...
|
|
u32 year = 2000 + DSTIMEGET(dstime, bcd_Y);
|
|
u32 month = DSTIMEGET(dstime, bcd_M);
|
|
u32 day = DSTIMEGET(dstime, bcd_D);
|
|
|
|
// date: year & month
|
|
if ((year >= 2100) || (month == 0) || (month > 12))
|
|
return false;
|
|
|
|
// date: day
|
|
// see: https://github.com/devkitPro/libnds/blob/9678bf09389cb1fcdc99dfa0357ec0cbe51dd0b7/source/arm7/clock.c#L224-L262
|
|
u32 months_lastday[1+12] = { 0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };
|
|
u32 leap = (((year % 4 == 0) && (year % 100 != 0)) || (year % 400 == 0)) ? 1 : 0;
|
|
u32 days_in_month = months_lastday[month] + ((month == 2) ? leap : 0);
|
|
if (day > days_in_month) return false;
|
|
|
|
return true;
|
|
}
|
|
|
|
bool get_dstime(DsTime* dstime) {
|
|
return (I2C_readRegBuf(I2C_DEV_MCU, 0x30, (void*) dstime, sizeof(DsTime)));
|
|
}
|
|
|
|
bool set_dstime(DsTime* dstime) {
|
|
if (!is_valid_dstime(dstime)) return false;
|
|
for (u32 i = 0; i < sizeof(DsTime); i++) {
|
|
if ((i == 3) || (i == 7)) continue; // skip the unused bytes
|
|
if (!I2C_writeReg(I2C_DEV_MCU, 0x30+i, ((u8*)dstime)[i]))
|
|
return false;
|
|
}
|
|
return true;
|
|
}
|