Merge pull request #17 from makermelissa/master

Add deinit code to I2C and SPI

adafruit_bitbangio.py

@@ -95,6 +95,11 @@ def __init__(self, scl, sda, *, frequency=400000, timeout=1):
         self._delay = 1 / frequency / 2
         self._timeout = timeout
 
+    def deinit(self):
+        """Free any hardware used by the object."""
+        self._sda.deinit()
+        self._scl.deinit()
+
     def scan(self):
         """Perform an I2C Device Scan"""
         found = []
@@ -276,6 +281,9 @@ def __init__(self, clock, MOSI=None, MISO=None):
         while self.try_lock():
             pass
 
+        self._mosi = None
+        self._miso = None
+
         self.configure()
         self.unlock()
 
@@ -291,6 +299,14 @@ def __init__(self, clock, MOSI=None, MISO=None):
             self._miso = DigitalInOut(MISO)
             self._miso.switch_to_input()
 
+    def deinit(self):
+        """Free any hardware used by the object."""
+        self._sclk.deinit()
+        if self._miso:
+            self._miso.deinit()
+        if self._mosi:
+            self._mosi.deinit()
+
     def configure(self, *, baudrate=100000, polarity=0, phase=0, bits=8):
         """Configures the SPI bus. Only valid when locked."""
         if self._check_lock():