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diff --git a/movement/watch_faces/complication/interval_face.h b/movement/watch_faces/complication/interval_face.h
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+/*
+ * MIT License
+ *
+ * Copyright (c) 2022 Andreas Nebinger
+ *
+ * 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 INTERVAL_FACE_H_
+#define INTERVAL_FACE_H_
+
+#include "movement.h"
+
+/*
+A face for customizable interval timers
+*/
+
+#define INTERVAL_TIMERS 9     // no of available customizable timers (be aware: only 4 bits reserved for this value in struct below)
+
+typedef struct {
+    uint8_t warmup_minutes;
+    uint8_t warmup_seconds;
+    uint8_t work_minutes;
+    uint8_t work_seconds;
+    uint8_t break_minutes;
+    uint8_t break_seconds;
+    uint8_t cooldown_minutes;
+    uint8_t cooldown_seconds;
+    uint8_t work_rounds;
+    uint8_t full_rounds;
+} interval_timer_setting_t;
+
+typedef enum {
+    interval_state_intro,
+    interval_state_waiting,
+    interval_state_setting,
+    interval_state_running,
+    interval_state_pausing
+} interval_timer_state_t;
+
+typedef struct {
+    bool is_active;
+    uint8_t face_idx;
+    uint8_t timer_idx;
+    uint8_t timer_running_idx;
+    interval_timer_state_t face_state;
+    interval_timer_setting_t timer[INTERVAL_TIMERS];
+} interval_face_state_t;
+
+void interval_face_setup(movement_settings_t *settings, uint8_t watch_face_index, void ** context_ptr);
+void interval_face_activate(movement_settings_t *settings, void *context);
+bool interval_face_loop(movement_event_t event, movement_settings_t *settings, void *context);
+void interval_face_resign(movement_settings_t *settings, void *context);
+
+#define interval_face ((const watch_face_t) { \
+    interval_face_setup, \
+    interval_face_activate, \
+    interval_face_loop, \
+    interval_face_resign, \
+    NULL \
+})
+
+#endif // INTERVAL_FACE_H_