codal_app/microbithal_audio: Add microbit_hal_audio_is_playing() func.

Signed-off-by: Damien George <damien@micropython.org>

Author: dpgeorge

src/codal_app/microbithal.h

@@ -174,6 +174,7 @@ int microbit_hal_log_data(const char *key, const char *value);
 void microbit_hal_audio_select_pin(int pin);
 void microbit_hal_audio_select_speaker(bool enable);
 void microbit_hal_audio_set_volume(int value);
+bool microbit_hal_audio_is_playing(void);
 bool microbit_hal_audio_is_expression_active(void);
 void microbit_hal_audio_play_expression(const char *expr);
 void microbit_hal_audio_stop_expression(void);

src/codal_app/microbithal_audio.cpp

@@ -86,6 +86,10 @@ void microbit_hal_sound_synth_callback(int event) {
     }
 }
 
+bool microbit_hal_audio_is_playing(void) {
+    return uBit.audio.isPlaying();
+}
+
 bool microbit_hal_audio_is_expression_active(void) {
     return sound_synth_active_count > 0;
 }