movement: move beat time to clock folder

movement/watch_faces/clock/beats_face.c

@@ -0,0 +1,91 @@
+#include <stdlib.h>
+#include <string.h>
+#include "beats_face.h"
+#include "watch.h"
+
+const uint8_t BEAT_REFRESH_FREQUENCY = 8;
+
+void beats_face_setup(movement_settings_t *settings, uint8_t watch_face_index, void ** context_ptr) {
+    (void) settings;
+    (void) watch_face_index;
+    (void) context_ptr;
+    if (*context_ptr == NULL) {
+        *context_ptr = malloc(sizeof(beats_face_state_t));
+    }
+}
+
+void beats_face_activate(movement_settings_t *settings, void *context) {
+    (void) settings;
+    beats_face_state_t *state = (beats_face_state_t *)context;
+    state->next_subsecond_update = 0;
+    state->last_centibeat_displayed = 0;
+    movement_request_tick_frequency(BEAT_REFRESH_FREQUENCY);
+}
+
+bool beats_face_loop(movement_event_t event, movement_settings_t *settings, void *context) {
+    (void) settings;
+    beats_face_state_t *state = (beats_face_state_t *)context;
+    if (event.event_type == EVENT_TICK && event.subsecond != state->next_subsecond_update) {
+         return true; // math is hard, don't do it if we don't have to.
+    }
+
+    char buf[16];
+    uint32_t centibeats;
+
+    watch_date_time date_time;
+    switch (event.event_type) {
+        case EVENT_ACTIVATE:
+        case EVENT_TICK:
+            date_time = watch_rtc_get_date_time();
+            centibeats = clock2beats(date_time.unit.hour, date_time.unit.minute, date_time.unit.second, event.subsecond, movement_timezone_offsets[settings->bit.time_zone]);
+            if (centibeats == state->last_centibeat_displayed) {
+                // we missed this update, try again next subsecond
+                state->next_subsecond_update = (event.subsecond + 1) % BEAT_REFRESH_FREQUENCY;
+            } else {
+                state->next_subsecond_update = (event.subsecond + 1 + (BEAT_REFRESH_FREQUENCY * 2 / 3)) % BEAT_REFRESH_FREQUENCY;
+                state->last_centibeat_displayed = centibeats;
+            }
+            sprintf(buf, "bt  %6lu", centibeats);
+
+            watch_display_string(buf, 0);
+            break;
+        case EVENT_LOW_ENERGY_UPDATE:
+            if (!watch_tick_animation_is_running()) watch_start_tick_animation(432);
+            date_time = watch_rtc_get_date_time();
+            centibeats = clock2beats(date_time.unit.hour, date_time.unit.minute, date_time.unit.second, event.subsecond, movement_timezone_offsets[settings->bit.time_zone]);
+            sprintf(buf, "bt  %4lu  ", centibeats / 100);
+
+            watch_display_string(buf, 0);
+            break;
+        case EVENT_MODE_BUTTON_UP:
+            movement_move_to_next_face();
+            break;
+        case EVENT_LIGHT_BUTTON_DOWN:
+            movement_illuminate_led();
+            break;
+        case EVENT_ALARM_BUTTON_DOWN:
+        case EVENT_ALARM_BUTTON_UP:
+        case EVENT_ALARM_LONG_PRESS:
+        default:
+            break;
+    }
+
+    return true;
+}
+
+void beats_face_resign(movement_settings_t *settings, void *context) {
+    (void) settings;
+    (void) context;
+}
+
+uint32_t clock2beats(uint32_t hours, uint32_t minutes, uint32_t seconds, uint32_t subseconds, int16_t utc_offset) {
+    uint32_t retval = seconds * 1000 + (subseconds * 1000) / (BEAT_REFRESH_FREQUENCY);
+    retval += 60 * minutes * 1000;
+    retval += hours * 60 * 60 * 1000;
+    retval -= (utc_offset - 60) * 60 * 1000;
+
+    retval /= 864; // convert to centibeats
+    retval %= 100000;
+
+    return retval;
+}

movement/watch_faces/clock/beats_face.h

@@ -0,0 +1,25 @@
+#ifndef BEATS_FACE_H_
+#define BEATS_FACE_H_
+
+#include "movement.h"
+
+typedef struct {
+    int8_t next_subsecond_update;
+    uint32_t last_centibeat_displayed;
+} beats_face_state_t;
+
+uint32_t clock2beats(uint32_t hours, uint32_t minutes, uint32_t seconds, uint32_t subseconds, int16_t utc_offset);
+void beats_face_setup(movement_settings_t *settings, uint8_t watch_face_index, void ** context_ptr);
+void beats_face_activate(movement_settings_t *settings, void *context);
+bool beats_face_loop(movement_event_t event, movement_settings_t *settings, void *context);
+void beats_face_resign(movement_settings_t *settings, void *context);
+
+#define beats_face ((const watch_face_t){ \
+    beats_face_setup, \
+    beats_face_activate, \
+    beats_face_loop, \
+    beats_face_resign, \
+    NULL, \
+})
+
+#endif // BEATS_FACE_H_