Port to GPIO/SAM

Author: mikaelpatel

README.md

@@ -2,7 +2,7 @@
 The DHT11 library is an Arduino-GPIO based device driver for the DHTXX
 Humidity and Temperature Sensor (DHT11, DHT21 and DHT22).
 
-Version: 1.0
+Version: 1.1
 
 ## Classes
 

examples/DHT11/DHT11.ino

@@ -32,5 +32,5 @@ void loop()
     Serial.print(F(": res = "));
     Serial.println(res);
   }
-  delay(1000);
+  delay(2000);
 }

library.properties

@@ -1,9 +1,9 @@
 name=Arduino-DHT
-version=1.0
+version=1.1
 author=Mikael Patel
 maintainer=Mikael Patel <mikael.patel@gmail.com>
 sentence=Digital Humidity and Temperature (DHT) Sensor library for Arduino.
 paragraph=The DHT library is an Arduino-GPIO based device driver for the DHTXX Humidity & Temperature Sensors (DHT11, DHT21 and DHT22).
 category=Sensors
 url=https://github.com/mikaelpatel/Arduino-DHT
-architectures=avr
+architectures=avr,sam

mainpage.dox

@@ -3,7 +3,7 @@
 The DHT library is an Arduino-GPIO based device driver for the DHTXX
 Humidity and Temperature Sensors (DHT11, DHT21 and DHT22).
 
-Version: 1.0
+Version: 1.1
 */
 
 /** @page License

src/DHT.h

@@ -49,8 +49,7 @@ class DHT {
     m_humidity(0),
     m_temperature(0)
   {
-    m_data.input();
-    m_data.low();
+    m_data.open_collector();
   }
 
   /**
@@ -82,10 +81,10 @@ class DHT {
     m_data.output();
     delay(START_SIGNAL);
     m_data.input();
-    uint8_t retry = 16;
+    int retry = 16;
     do {
       delayMicroseconds(PULLUP);
-    } while (m_data != 0 && --retry);
+    } while (m_data && --retry);
     if (retry == 0 || m_data.pulse() < THRESHOLD) return (-2);
 
     // Read data from the device. Each bit is pulse width coded;
@@ -94,8 +93,10 @@ class DHT {
     uint8_t d[5];
     for (int i = 0; i < 5; i++) {
       uint8_t v = 0;
-      for (int j = 0; j < 8; j++)
-	v = (v << 1) | (m_data.pulse() > THRESHOLD);
+      for (int j = 0; j < 8; j++) {
+	uint8_t width = m_data.pulse();
+	v = (v << 1) | (width > THRESHOLD);
+      }
       d[i] = v;
       if (i < 4) chsum += v;
     }