Weeknumber watch face

Same as simple clock, but has iso 8601 week number instead of seconds counter

6 files changed, 310 insertions, 10 deletions

diff --git a/movement/make/Makefile b/movement/make/Makefile
index bf9351eb..52ecbe43 100644
--- a/movement/make/Makefile
+++ b/movement/make/Makefile
@@ -43,6 +43,7 @@ SRCS += \
   ../watch_faces/clock/simple_clock_face.c \
   ../watch_faces/clock/world_clock_face.c \
   ../watch_faces/clock/beats_face.c \
+  ../watch_faces/clock/weeknumber_clock_face.c \
   ../watch_faces/settings/preferences_face.c \
   ../watch_faces/settings/set_time_face.c \
   ../watch_faces/sensor/thermistor_readout_face.c \
diff --git a/movement/movement_faces.h b/movement/movement_faces.h
index 282be0e6..c0e765ea 100644
--- a/movement/movement_faces.h
+++ b/movement/movement_faces.h
@@ -58,6 +58,7 @@
 #include "frequency_correction_face.h"
 #include "alarm_face.h"
 #include "ratemeter_face.h"
+#include "weeknumber_clock_face.h"
 // New includes go above this line.
 
 #endif // MOVEMENT_FACES_H_
diff --git a/movement/watch_faces/clock/weeknumber_clock_face.c b/movement/watch_faces/clock/weeknumber_clock_face.c
new file mode 100644
index 00000000..e49e5abf
--- /dev/null
+++ b/movement/watch_faces/clock/weeknumber_clock_face.c
@@ -0,0 +1,171 @@
+/*
+ * MIT License
+ *
+ * Copyright (c) 2022 Joey Castillo
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+#include <stdlib.h>
+#include "weeknumber_clock_face.h"
+#include "watch.h"
+#include "watch_utility.h"
+
+static void _update_alarm_indicator(bool settings_alarm_enabled, weeknumber_clock_state_t *state) {
+    state->alarm_enabled = settings_alarm_enabled;
+    if (state->alarm_enabled) watch_set_indicator(WATCH_INDICATOR_SIGNAL);
+    else watch_clear_indicator(WATCH_INDICATOR_SIGNAL);
+}
+
+void weeknumber_clock_face_setup(movement_settings_t *settings, uint8_t watch_face_index, void ** context_ptr) {
+    (void) settings;
+    (void) watch_face_index;
+
+    if (*context_ptr == NULL) {
+        *context_ptr = malloc(sizeof(weeknumber_clock_state_t));
+        weeknumber_clock_state_t *state = (weeknumber_clock_state_t *)*context_ptr;
+        state->signal_enabled = false;
+        state->watch_face_index = watch_face_index;
+    }
+}
+
+void weeknumber_clock_face_activate(movement_settings_t *settings, void *context) {
+    weeknumber_clock_state_t *state = (weeknumber_clock_state_t *)context;
+
+    if (watch_tick_animation_is_running()) watch_stop_tick_animation();
+
+    if (settings->bit.clock_mode_24h) watch_set_indicator(WATCH_INDICATOR_24H);
+
+    // handle chime indicator
+    if (state->signal_enabled) watch_set_indicator(WATCH_INDICATOR_BELL);
+    else watch_clear_indicator(WATCH_INDICATOR_BELL);
+
+    // show alarm indicator if there is an active alarm
+    _update_alarm_indicator(settings->bit.alarm_enabled, state);
+
+    watch_set_colon();
+
+    // this ensures that none of the timestamp fields will match, so we can re-render them all.
+    state->previous_date_time = 0xFFFFFFFF;
+}
+
+bool weeknumber_clock_face_loop(movement_event_t event, movement_settings_t *settings, void *context) {
+    weeknumber_clock_state_t *state = (weeknumber_clock_state_t *)context;
+    char buf[11];
+    uint8_t pos;
+
+    watch_date_time date_time;
+    uint32_t previous_date_time;
+    switch (event.event_type) {
+        case EVENT_ACTIVATE:
+        case EVENT_TICK:
+        case EVENT_LOW_ENERGY_UPDATE:
+            date_time = watch_rtc_get_date_time();
+            previous_date_time = state->previous_date_time;
+            state->previous_date_time = date_time.reg;
+
+            // check the battery voltage once a day...
+            if (date_time.unit.day != state->last_battery_check) {
+                state->last_battery_check = date_time.unit.day;
+                watch_enable_adc();
+                uint16_t voltage = watch_get_vcc_voltage();
+                watch_disable_adc();
+                // 2.2 volts will happen when the battery has maybe 5-10% remaining?
+                // we can refine this later.
+                state->battery_low = (voltage < 2200);
+            }
+
+            // ...and set the LAP indicator if low.
+            if (state->battery_low) watch_set_indicator(WATCH_INDICATOR_LAP);
+
+            if ((date_time.reg >> 12) == (previous_date_time >> 12) && event.event_type != EVENT_LOW_ENERGY_UPDATE) {
+                // everything before minutes is the same.
+                pos = 6;
+                sprintf(buf, "%02d%02d", date_time.unit.minute, watch_utility_get_weeknumber(date_time.unit.year, date_time.unit.month, date_time.unit.day));
+            } else {
+                // other stuff changed; let's do it all.
+                if (!settings->bit.clock_mode_24h) {
+                    // if we are in 12 hour mode, do some cleanup.
+                    if (date_time.unit.hour < 12) {
+                        watch_clear_indicator(WATCH_INDICATOR_PM);
+                    } else {
+                        watch_set_indicator(WATCH_INDICATOR_PM);
+                    }
+                    date_time.unit.hour %= 12;
+                    if (date_time.unit.hour == 0) date_time.unit.hour = 12;
+                }
+                pos = 0;
+                if (event.event_type == EVENT_LOW_ENERGY_UPDATE) {
+                    if (!watch_tick_animation_is_running()) watch_start_tick_animation(500);
+                    sprintf(buf, "%s%2d%2d%02d  ", watch_utility_get_weekday(date_time), date_time.unit.day, date_time.unit.hour, date_time.unit.minute);
+                } else {
+                    sprintf(buf, "%s%2d%2d%02d%02d", watch_utility_get_weekday(date_time), date_time.unit.day, date_time.unit.hour, date_time.unit.minute, watch_utility_get_weeknumber(date_time.unit.year, date_time.unit.month, date_time.unit.day));
+                }
+            }
+            watch_display_string(buf, pos);
+            // handle alarm indicator
+            if (state->alarm_enabled != settings->bit.alarm_enabled) _update_alarm_indicator(settings->bit.alarm_enabled, state);
+            break;
+        case EVENT_MODE_BUTTON_UP:
+            movement_move_to_next_face();
+            return false;
+        case EVENT_LIGHT_BUTTON_DOWN:
+            movement_illuminate_led();
+            break;
+        case EVENT_ALARM_LONG_PRESS:
+            state->signal_enabled = !state->signal_enabled;
+            if (state->signal_enabled) watch_set_indicator(WATCH_INDICATOR_BELL);
+            else watch_clear_indicator(WATCH_INDICATOR_BELL);
+            break;
+        case EVENT_BACKGROUND_TASK:
+            // uncomment this line to snap back to the clock face when the hour signal sounds:
+            // movement_move_to_face(state->watch_face_index);
+            if (watch_is_buzzer_or_led_enabled()) {
+                // if we are in the foreground, we can just beep.
+                movement_play_signal();
+            } else {
+                // if we were in the background, we need to enable the buzzer peripheral first,
+                watch_enable_buzzer();
+                // beep quickly (this call blocks for 275 ms),
+                movement_play_signal();
+                // and then turn the buzzer peripheral off again.
+                watch_disable_buzzer();
+            }
+            break;
+        default:
+            break;
+    }
+
+    return true;
+}
+
+void weeknumber_clock_face_resign(movement_settings_t *settings, void *context) {
+    (void) settings;
+    (void) context;
+}
+
+bool weeknumber_clock_face_wants_background_task(movement_settings_t *settings, void *context) {
+    (void) settings;
+    weeknumber_clock_state_t *state = (weeknumber_clock_state_t *)context;
+    if (!state->signal_enabled) return false;
+
+    watch_date_time date_time = watch_rtc_get_date_time();
+
+    return date_time.unit.minute == 0;
+}
diff --git a/movement/watch_faces/clock/weeknumber_clock_face.h b/movement/watch_faces/clock/weeknumber_clock_face.h
new file mode 100644
index 00000000..f0298ea8
--- /dev/null
+++ b/movement/watch_faces/clock/weeknumber_clock_face.h
@@ -0,0 +1,53 @@
+/*
+ * MIT License
+ *
+ * Copyright (c) 2022 Joey Castillo
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+#ifndef WEEKNUMBER_CLOCK_FACE_H_
+#define WEEKNUMBER_CLOCK_FACE_H_
+
+#include "movement.h"
+
+typedef struct {
+    uint32_t previous_date_time;
+    uint8_t last_battery_check;
+    uint8_t watch_face_index;
+    bool signal_enabled;
+    bool battery_low;
+    bool alarm_enabled;
+} weeknumber_clock_state_t;
+
+void weeknumber_clock_face_setup(movement_settings_t *settings, uint8_t watch_face_index, void ** context_ptr);
+void weeknumber_clock_face_activate(movement_settings_t *settings, void *context);
+bool weeknumber_clock_face_loop(movement_event_t event, movement_settings_t *settings, void *context);
+void weeknumber_clock_face_resign(movement_settings_t *settings, void *context);
+bool weeknumber_clock_face_wants_background_task(movement_settings_t *settings, void *context);
+
+#define weeknumber_clock_face ((const watch_face_t){ \
+    weeknumber_clock_face_setup, \
+    weeknumber_clock_face_activate, \
+    weeknumber_clock_face_loop, \
+    weeknumber_clock_face_resign, \
+    weeknumber_clock_face_wants_background_task, \
+})
+
+#endif // SIMPLE_CLOCK_FACE_H_
diff --git a/watch-library/shared/watch/watch_utility.c b/watch-library/shared/watch/watch_utility.c
index 252624b3..6a8b408a 100644
--- a/watch-library/shared/watch/watch_utility.c
+++ b/watch-library/shared/watch/watch_utility.c
@@ -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--;
+    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];
+}
+
+// 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 weekdays[(date_time.unit.day + 13 * (date_time.unit.month + 1) / 5 + date_time.unit.year + date_time.unit.year / 4 + 525) % 7];
+    return ((day + (13 * (month + 1) / 5) + year + (year / 4) + 5) % 7) + 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) {
+// 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;
diff --git a/watch-library/shared/watch/watch_utility.h b/watch-library/shared/watch/watch_utility.h
index 57bcbed7..f96bd8c1 100644
--- a/watch-library/shared/watch/watch_utility.h
+++ b/watch-library/shared/watch/watch_utility.h
@@ -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.