codal_app/microbithal_microphone: Add hal_microphone_get_level_db().

Signed-off-by: Damien George <[email protected]>

src/codal_app/microbithal.h

@@ -165,6 +165,7 @@ int microbit_hal_compass_get_heading(void);
 void microbit_hal_microphone_init(void);
 void microbit_hal_microphone_set_threshold(int kind, int value);
 int microbit_hal_microphone_get_level(void);
+float microbit_hal_microphone_get_level_db(void);
 
 const uint8_t *microbit_hal_get_font_data(char c);
 

src/codal_app/microbithal_microphone.cpp

@@ -59,4 +59,11 @@ int microbit_hal_microphone_get_level(void) {
     return value;
 }
 
+float microbit_hal_microphone_get_level_db(void) {
+    uBit.audio.levelSPL->setUnit(LEVEL_DETECTOR_SPL_DB);
+    float value = uBit.audio.levelSPL->getValue();
+    uBit.audio.levelSPL->setUnit(LEVEL_DETECTOR_SPL_8BIT);
+    return value;
+}
+
 }