3 files changed, 45 insertions, 3 deletions
diff --git a/watch-library/shared/watch/watch_buzzer.h b/watch-library/shared/watch/watch_buzzer.h
index 7ba9a52e..4c39475c 100644
--- a/watch-library/shared/watch/watch_buzzer.h
+++ b/watch-library/shared/watch/watch_buzzer.h
@@ -175,6 +175,8 @@ extern const uint16_t NotePeriods[108];
   */
 void watch_buzzer_play_sequence(int8_t *note_sequence, void (*callback_on_end)(void));
 
+uint16_t sequence_length(int8_t *sequence);
+
 /** @brief Aborts a playing sequence.
   */
 void watch_buzzer_abort_sequence(void);
diff --git a/watch-library/shared/watch/watch_private_buzzer.c b/watch-library/shared/watch/watch_private_buzzer.c
index 0618f425..def54a46 100644
--- a/watch-library/shared/watch/watch_private_buzzer.c
+++ b/watch-library/shared/watch/watch_private_buzzer.c
@@ -23,6 +23,13 @@
  */
 #include "driver_init.h"
 
-// note: the buzzer uses a 1 MHz clock. these values were determined by dividing 1,000,000 by the target frequency.
-// i.e. for a 440 Hz tone (A4 on the piano), 1MHz/440Hz = 2273
-const uint16_t NotePeriods[108] = {18182,17161,16197,15288,14430,13620,12857,12134,11453,10811,10204,9631,9091,8581,8099,7645,7216,6811,6428,6068,5727,5405,5102,4816,4545,4290,4050,3822,3608,3405,3214,3034,2863,2703,2551,2408,2273,2145,2025,1911,1804,1703,1607,1517,1432,1351,1276,1204,1136,1073,1012,956,902,851,804,758,716,676,638,602,568,536,506,478,451,426,402,379,358,338,319,301,284,268,253,239,225,213,201,190,179,169,159,150,142,134,127};
+uint16_t sequence_length(int8_t *sequence) {
+    uint16_t result = 0;
+
+    while (*sequence != 0){
+        result += *(sequence + 1);
+        sequence += 2;
+    }
+
+    return result;
+}
diff --git a/watch-library/shared/watch/watch_private_buzzer.h b/watch-library/shared/watch/watch_private_buzzer.h
new file mode 100644
index 00000000..3017bbb5
--- /dev/null
+++ b/watch-library/shared/watch/watch_private_buzzer.h
@@ -0,0 +1,33 @@
+/*
+ * MIT License
+ *
+ * Copyright (c) 2023 Wesley Aptekar-Cassels
+ *
+ * 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 _WATCH_PRIVATE_BUZZER_H_INCLUDED
+#define _WATCH_PRIVATE_BUZZER_H_INCLUDED
+
+// note: the buzzer uses a 1 MHz clock. these values were determined by dividing 1,000,000 by the target frequency.
+// i.e. for a 440 Hz tone (A4 on the piano), 1MHz/440Hz = 2273
+const uint16_t NotePeriods[108] = {18182,17161,16197,15288,14430,13620,12857,12134,11453,10811,10204,9631,9091,8581,8099,7645,7216,6811,6428,6068,5727,5405,5102,4816,4545,4290,4050,3822,3608,3405,3214,3034,2863,2703,2551,2408,2273,2145,2025,1911,1804,1703,1607,1517,1432,1351,1276,1204,1136,1073,1012,956,902,851,804,758,716,676,638,602,568,536,506,478,451,426,402,379,358,338,319,301,284,268,253,239,225,213,201,190,179,169,159,150,142,134,127};
+
+uint16_t sequence_length(int8_t *sequence);
+
+#endif