InfiniTime/src/components/datetime/DateTimeController.cpp

#include "DateTimeController.h"
#include <date/date.h>
#include <libraries/log/nrf_log.h>

using namespace Pinetime::Controllers;


void DateTime::SetTime(uint16_t year, uint8_t month, uint8_t day, uint8_t dayOfWeek, uint8_t hour, uint8_t minute,
                       uint8_t second, uint32_t systickCounter) {
  std::tm tm = { /* .tm_sec  = */ second,
          /* .tm_min  = */ minute,
          /* .tm_hour = */ hour,
          /* .tm_mday = */ day,
          /* .tm_mon  = */ month - 1,
          /* .tm_year = */ year - 1900,
  };
  tm.tm_isdst = -1; // Use DST value from local time zone
  currentDateTime =  std::chrono::system_clock::from_time_t(std::mktime(&tm));

  NRF_LOG_INFO("%d %d %d ", day, month, year);
  NRF_LOG_INFO("%d %d %d ", hour, minute, second);
  previousSystickCounter = systickCounter;

  UpdateTime(systickCounter);
  NRF_LOG_INFO("* %d %d %d ", this->hour, this->minute, this->second);
  NRF_LOG_INFO("* %d %d %d ", this->day, this->month, this->year);
}

void DateTime::UpdateTime(uint32_t systickCounter) {
  // Handle systick counter overflow
  uint32_t systickDelta = 0;
  if(systickCounter < previousSystickCounter) {
    systickDelta = 0xffffff - previousSystickCounter;
    systickDelta += systickCounter + 1;
  } else {
    systickDelta = systickCounter - previousSystickCounter;
  }

  /*
 * 1000 ms = 1024 ticks
 */
  auto correctedDelta = systickDelta / 1024;
  auto rest = (systickDelta - (correctedDelta*1024));
  if(systickCounter >= rest) {
    previousSystickCounter = systickCounter - rest;
  } else {
    previousSystickCounter = 0xffffff - (rest - systickCounter);
  }

  currentDateTime += std::chrono::seconds(correctedDelta);
  uptime += std::chrono::seconds(correctedDelta);

  auto dp = date::floor<date::days>(currentDateTime);
  auto time = date::make_time(currentDateTime-dp);
  auto yearMonthDay = date::year_month_day(dp);

  year = (int)yearMonthDay.year();
  month = static_cast<Months>((unsigned)yearMonthDay.month());
  day = (unsigned)yearMonthDay.day();
  dayOfWeek = static_cast<Days>(date::weekday(yearMonthDay).iso_encoding());

  hour = time.hours().count();
  minute = time.minutes().count();
  second = time.seconds().count();
}