1 files changed, 64 insertions, 0 deletions
diff --git a/watch-library/hardware/watch/watch_buzzer.c b/watch-library/hardware/watch/watch_buzzer.c
new file mode 100644
index 00000000..a275b00d
--- /dev/null
+++ b/watch-library/hardware/watch/watch_buzzer.c
@@ -0,0 +1,64 @@
+/*
+ * MIT License
+ *
+ * Copyright (c) 2020 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 "watch_buzzer.h"
+
+ inline void watch_enable_buzzer(void) {
+    if (!hri_tcc_get_CTRLA_reg(TCC0, TCC_CTRLA_ENABLE)) {
+        _watch_enable_tcc();
+    }
+}
+inline void watch_set_buzzer_period(uint32_t period) {
+    hri_tcc_write_PERBUF_reg(TCC0, period);
+}
+
+void watch_disable_buzzer(void) {
+    _watch_disable_tcc();
+}
+
+inline void watch_set_buzzer_on(void) {
+    gpio_set_pin_direction(BUZZER, GPIO_DIRECTION_OUT);
+    gpio_set_pin_function(BUZZER, WATCH_BUZZER_TCC_PINMUX);
+}
+
+inline void watch_set_buzzer_off(void) {
+    gpio_set_pin_direction(BUZZER, GPIO_DIRECTION_OFF);
+    gpio_set_pin_function(BUZZER, GPIO_PIN_FUNCTION_OFF);
+}
+
+// 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};
+
+void watch_buzzer_play_note(BuzzerNote note, uint16_t duration_ms) {
+    if (note == BUZZER_NOTE_REST) {
+        watch_set_buzzer_off();
+    } else {
+        hri_tcc_write_PERBUF_reg(TCC0, NotePeriods[note]);
+        hri_tcc_write_CCBUF_reg(TCC0, WATCH_BUZZER_TCC_CHANNEL, NotePeriods[note] / 2);
+        watch_set_buzzer_on();
+    }
+    delay_ms(duration_ms);
+    watch_set_buzzer_off();
+}