Fix #44 by conditionally excluding unused port and bitmask state on non-AVR platforms.

DHT.cpp

@@ -11,8 +11,10 @@ written by Adafruit Industries
 DHT::DHT(uint8_t pin, uint8_t type, uint8_t count) {
   _pin = pin;
   _type = type;
+  #ifdef __AVR
     _bit = digitalPinToBitMask(pin);
     _port = digitalPinToPort(pin);
+  #endif
   _maxcycles = microsecondsToClockCycles(1000);  // 1 millisecond timeout for
                                                  // reading pulses from DHT sensor.
   // Note that count is now ignored as the DHT reading algorithm adjusts itself

DHT.h

@@ -48,7 +48,12 @@ class DHT {
 
  private:
   uint8_t data[5];
-  uint8_t _pin, _type, _bit, _port;
+  uint8_t _pin, _type;
+  #ifdef __AVR
+    // Use direct GPIO access on an 8-bit AVR so keep track of the port and bitmask
+    // for the digital pin connected to the DHT.  Other platforms will use digitalRead.
+    uint8_t _bit, _port;
+  #endif
   uint32_t _lastreadtime, _maxcycles;
   bool _lastresult;
 

library.properties

@@ -1,5 +1,5 @@
 name=DHT sensor library
-version=1.2.2
+version=1.2.3
 author=Adafruit
 maintainer=Adafruit <info@adafruit.com>
 sentence=Arduino library for DHT11, DHT22, etc Temp & Humidity Sensors