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Weeknumber watch face

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Same as simple clock, but has iso 8601 week number instead of seconds counter
This commit is contained in:
Slim
2022-12-02 19:45:53 +01:00
parent 852099e1ab
commit a69547805b
6 changed files with 311 additions and 11 deletions
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69
watch-library/shared/watch/watch_utility.c
View File

@@ -26,16 +26,60 @@
#include "watch_utility.h"
const char * watch_utility_get_weekday(watch_date_time date_time) {
static const char weekdays[7][3] = {"SA", "SU", "MO", "TU", "WE", "TH", "FR"};
date_time.unit.year += 20;
if (date_time.unit.month <= 2) {
date_time.unit.month += 12;
date_time.unit.year--;
}
return weekdays[(date_time.unit.day + 13 * (date_time.unit.month + 1) / 5 + date_time.unit.year + date_time.unit.year / 4 + 525) % 7];
static const char weekdays[7][3] = {"MO", "TU", "WE", "TH", "FR", "SA", "SU"};
return weekdays[watch_utility_get_iso8601_weekday_number(date_time.unit.year + WATCH_RTC_REFERENCE_YEAR, date_time.unit.month, date_time.unit.day) - 1];
}
uint32_t watch_utility_convert_to_unix_time(uint16_t year, uint8_t month, uint8_t day, uint8_t hour, uint8_t minute, uint8_t second, uint32_t utc_offset) {
// Per ISO8601 week starts on Monday with index 1
uint8_t watch_utility_get_iso8601_weekday_number(uint16_t year, uint8_t month, uint8_t day) {
year -= WATCH_RTC_REFERENCE_YEAR;
year += 20;
if (month <= 2) {
month += 12;
year--;
}
return ((day + (13 * (month + 1) / 5) + year + (year / 4) + 5) % 7) + 1;
}
// this function is from the excellent musl c library
uint8_t watch_utility_get_weeknumber(uint16_t year, uint8_t month, uint8_t day) {
uint8_t weekday;
uint16_t days;
weekday = watch_utility_get_iso8601_weekday_number(year, month, day) % 7;
days = watch_utility_days_since_new_year(year, month, day);
int val = (days + 7U - (weekday+6U)%7) / 7;
/* If 1 Jan is just 1-3 days past Monday,
* the previous week is also in this year. */
if ((weekday + 371U - days - 2) % 7 <= 2)
val++;
if (!val) {
val = 52;
/* If 31 December of prev year a Thursday,
* or Friday of a leap year, then the
* prev year has 53 weeks. */
int dec31 = (weekday + 7U - days - 1) % 7;
if (dec31 == 4 || (dec31 == 5 && is_leap(year%400-1)))
val++;
} else if (val == 53) {
/* If 1 January is not a Thursday, and not
* a Wednesday of a leap year, then this
* year has only 52 weeks. */
int jan1 = (weekday + 371U - days) % 7;
if (jan1 != 4 && (jan1 != 3 || !is_leap(year)))
val = 1;
}
return val;
}
uint8_t is_leap(uint16_t y)
{
y += 1900;
return !(y%4) && ((y%100) || !(y%400));
}
uint16_t watch_utility_days_since_new_year(uint16_t year, uint8_t month, uint8_t day) {
uint16_t DAYS_SO_FAR[] = {
0, // Jan
31, // Feb
@@ -51,10 +95,13 @@ uint32_t watch_utility_convert_to_unix_time(uint16_t year, uint8_t month, uint8_
334 // December
};
return (is_leap(year) && (month > 2) ? 1 : 0) + DAYS_SO_FAR[month - 1] + day;
}
uint32_t watch_utility_convert_to_unix_time(uint16_t year, uint8_t month, uint8_t day, uint8_t hour, uint8_t minute, uint8_t second, uint32_t utc_offset) {
uint32_t year_adj = year + 4800;
uint32_t febs = year_adj - (month <= 2 ? 1 : 0); /* Februaries since base. */
uint32_t leap_days = 1 + (febs / 4) - (febs / 100) + (febs / 400);
uint32_t days = 365 * year_adj + leap_days + DAYS_SO_FAR[month - 1] + day - 1;
uint32_t leap_days = 1 + (year_adj / 4) - (year_adj / 100) + (year_adj / 400);
uint32_t days = 365 * year_adj + leap_days + watch_utility_days_since_new_year(year, month, day) - 1;
days -= 2472692; /* Adjust to Unix epoch. */
uint32_t timestamp = days * 86400;

27
watch-library/shared/watch/watch_utility.h
View File

@@ -46,6 +46,33 @@ typedef struct {
*/
const char * watch_utility_get_weekday(watch_date_time date_time);
/** @brief Returns a number between 1-7 representing the weekday according to ISO8601 : week starts on Monday and has index 1, Sunday has index 7
* @param year The year of the date
* @param month The month of the date (1-12)
* @param day The day of the date (1-31)
*/
uint8_t watch_utility_get_iso8601_weekday_number(uint16_t year, uint8_t month, uint8_t day);
/** @brief Returns a number between 1-53 representing the weeknumber according to ISO8601 : First week of the year always contains Thursday. If it overlaps on previous year, current year has 53 weeks
* @param year The year of the date
* @param month The month of the date (1-12)
* @param day The day of the date (1-31)
*/
uint8_t watch_utility_get_weeknumber(uint16_t year, uint8_t month, uint8_t day);
/** @brief Returns a number between 1-366 representing the elapsed days since January 1st the same year.
* @param year The year of the date
* @param month The month of the date (1-12)
* @param day The day of the date (1-31)
*/
uint16_t watch_utility_days_since_new_year(uint16_t year, uint8_t month, uint8_t day);
/** @brief Returns 1 if year is leap and 0 otherwise
* @param year The year (ex. 2022)
*/
uint8_t is_leap(uint16_t year);
/** @brief Returns the UNIX time (seconds since 1970) for a given date/time in UTC.
* @param date_time The watch_date_time that you wish to convert.
* @param year The year of the date you wish to convert.