Play an arbitrary stream on the buzzer without blocking

watch-library/hardware/watch/watch_tcc.c

@@ -28,11 +28,15 @@
 #include "tc.h"
 
 void _watch_enable_tcc(void);
+static void (*_cb_tc0)(void) = NULL;
 void cb_watch_buzzer_seq(void);
+void cb_watch_buzzer_raw_source(void);
 
 static uint16_t _seq_position;
 static int8_t _tone_ticks, _repeat_counter;
 static int8_t *_sequence;
+static watch_buzzer_raw_source_t _raw_source;
+static void* _userdata;
 static uint8_t _volume;
 static void (*_cb_finished)(void);
 static watch_cb_t _cb_start_global = NULL;
@@ -94,6 +98,7 @@ void watch_buzzer_play_sequence_with_volume(int8_t *note_sequence, void (*callba
     _repeat_counter = -1;
     // prepare buzzer
     
+    _cb_tc0 = cb_watch_buzzer_seq;
     // setup TC0 timer
     _tc0_initialize();
     // start the timer (for the 64 hz callback)
@@ -138,6 +143,67 @@ void cb_watch_buzzer_seq(void) {
     } else _tone_ticks--;
 }
 
+void watch_buzzer_play_raw_source(watch_buzzer_raw_source_t raw_source, void* userdata, watch_cb_t callback_on_end) {
+    watch_buzzer_play_raw_source_with_volume(raw_source, userdata, callback_on_end, WATCH_BUZZER_VOLUME_LOUD);
+}
+
+void watch_buzzer_play_raw_source_with_volume(watch_buzzer_raw_source_t raw_source, void* userdata, watch_cb_t callback_on_end, watch_buzzer_volume_t volume) {
+    // Abort any previous sequence
+    watch_buzzer_abort_sequence();
+
+    _buzzer_is_active = true;
+
+    if (_cb_start_global) {
+        _cb_start_global();
+    }
+
+    watch_enable_buzzer_and_leds();
+
+    watch_set_buzzer_off();
+    _raw_source = raw_source;
+    _userdata = userdata;
+    _cb_finished = callback_on_end;
+    _volume = volume == WATCH_BUZZER_VOLUME_SOFT ? 5 : 25;
+    _seq_position = 0;
+    _tone_ticks = 0;
+    // prepare buzzer
+
+    _cb_tc0 = cb_watch_buzzer_raw_source;
+    // setup TC0 timer
+    _tc0_initialize();
+    // start the timer (for the 64 hz callback)
+    _tc0_start();
+}
+
+void cb_watch_buzzer_raw_source(void) {
+    // callback for reading the note sequence
+    uint16_t period;
+    uint16_t duration;
+    bool done;
+
+    if (_tone_ticks == 0) {
+        done = _raw_source(_seq_position, _userdata, &period, &duration);
+
+        if (done) {
+            // end the sequence
+            watch_buzzer_abort_sequence();
+        } else {
+            if (period == WATCH_BUZZER_PERIOD_REST) {
+                watch_set_buzzer_off();
+            } else {
+                watch_set_buzzer_period_and_duty_cycle(period, _volume);
+                watch_set_buzzer_on();
+            }
+
+            // set duration ticks and move to next tone
+            _tone_ticks = duration;
+            _seq_position += 1;
+        }
+    } else {
+        _tone_ticks--;
+    }
+}
+
 void watch_buzzer_abort_sequence(void) {
     // ends/aborts the sequence
     if (!_buzzer_is_active) {
@@ -169,7 +235,9 @@ void watch_buzzer_register_global_callbacks(watch_cb_t cb_start, watch_cb_t cb_s
 
 void irq_handler_tc0(void) {
     // interrupt handler for TC0 (globally!)
-    cb_watch_buzzer_seq();
+    if (_cb_tc0) {
+        _cb_tc0();
+    }
     TC0->COUNT8.INTFLAG.reg |= TC_INTFLAG_OVF;
 }