Add I2S pin script, fix cap-touch script

Author: kattni

CircuitPython_Templates/cap_touch_pin_script/.circuitpython.skip

@@ -17,7 +17,7 @@ def is_touch_capable(pin_name):
         else:
             return False  # Otherwise, the pins are invalid.
     except TypeError:  # Error returned when checking a non-pin object in dir(board).
-        pass  # Passes over non-pin objects in dir(board).
+        return False  # Invalid if non-pin objects in dir(board).
 
 
 def get_pin_names():

CircuitPython_Templates/cap_touch_pin_script/code.py

@@ -0,0 +1,57 @@
+"""
+CircuitPython I2S Pin Combination Identification Script
+"""
+import board
+import audiobusio
+from microcontroller import Pin
+
+
+def is_hardware_i2s(bit_clock, word_select, data):
+    try:
+        p = audiobusio.I2SOut(bit_clock, word_select, data)
+        p.deinit()
+        return True
+    except ValueError:
+        return False
+
+
+def get_unique_pins():
+    exclude = [
+        getattr(board, p)
+        for p in [
+            # This is not an exhaustive list of unexposed pins. Your results
+            # may include other pins that you cannot easily connect to.
+            "NEOPIXEL",
+            "DOTSTAR_CLOCK",
+            "DOTSTAR_DATA",
+            "APA102_SCK",
+            "APA102_MOSI",
+            "L",
+            "SWITCH",
+            "BUTTON",
+        ]
+        if p in dir(board)
+    ]
+    pins = [
+        pin
+        for pin in [getattr(board, p) for p in dir(board)]
+        if isinstance(pin, Pin) and pin not in exclude
+    ]
+    unique = []
+    for p in pins:
+        if p not in unique:
+            unique.append(p)
+    return unique
+
+
+for bit_clock_pin in get_unique_pins():
+    for word_select_pin in get_unique_pins():
+        for data_pin in get_unique_pins():
+            if bit_clock_pin is word_select_pin or bit_clock_pin is data_pin or word_select_pin \
+                    is data_pin:
+                continue
+            if is_hardware_i2s(bit_clock_pin, word_select_pin, data_pin):
+                print("Bit clock pin:", bit_clock_pin, "\t Word select pin:", word_select_pin,
+                      "\t Data pin:", data_pin)
+            else:
+                pass