Adding Where's my PDMIn code

Author: kattni

PDM_Microphone/Wheres_my_PDMIn.py

@@ -0,0 +1,37 @@
+import board
+import audiobusio
+from microcontroller import Pin
+
+
+def is_hardware_PDM(clock, data):
+    try:
+        p = audiobusio.PDMIn(clock, data)
+        p.deinit()
+        return True
+    except ValueError:
+        return False
+    except RuntimeError:
+        return True
+
+
+def get_unique_pins():
+    exclude = ['NEOPIXEL', 'APA102_MOSI', 'APA102_SCK']
+    pins = [pin for pin in [
+        getattr(board, p) for p in dir(board) if p not in exclude]
+            if isinstance(pin, Pin)]
+    unique = []
+    for p in pins:
+        if p not in unique:
+            unique.append(p)
+    return unique
+
+
+for clock_pin in get_unique_pins():
+    for data_pin in get_unique_pins():
+        if clock_pin is data_pin:
+            continue
+        else:
+            if is_hardware_PDM(clock_pin, data_pin):
+                print("Clock pin:", clock_pin, "\t Data pin:", data_pin)
+            else:
+                pass