Diff: hcsr04.cpp

Revision:

0:fb0929f37ebe

Child:

1:093521f56089

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/hcsr04.cpp	Sat Mar 30 17:27:39 2013 +0000
@@ -0,0 +1,67 @@
+/* Copyright (c) 2013 Prabhu Desai
+ * pdtechworld@gmail.com
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of this software
+ * and associated documentation files (the "Software"), to deal in the Software without restriction,
+ * including without limitation the rights to use, copy, modify, merge, publish, distribute,
+ * sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all copies or
+ * substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING
+ * BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
+ * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+
+#include "hcsr04.h"
+
+
+DistMeasure::DistMeasure(PinName TrigPin,PinName EchoPin,unsigned int maxtime):
+    trigger(TrigPin), echo(EchoPin), timeout(maxtime)
+{
+    pulsetime.stop();
+    pulsetime.reset();
+   // this.rise(&DistMeasure::isr_rise);
+   // this.fall(&DistMeasure::isr_fall);    
+}
+
+
+DistMeasure::~DistMeasure()
+{
+}
+
+ 
+void DistMeasure::isr_rise(void)
+{
+    pulsetime.start();
+}
+
+void DistMeasure::isr_fall(void)
+{
+    pulsetime.stop();
+    pulsedur = pulsetime.read_us();
+    distance= (pulsedur*343)/20000;
+    pulsetime.reset();
+}
+void DistMeasure::rise (void (*fptr)(void))
+{
+    echo.rise(fptr);
+}
+void DistMeasure::fall (void (*fptr)(void))
+{
+    echo.fall(fptr);
+}
+
+unsigned int DistMeasure::get_distance_cm()
+{
+    if(distance > 65530) {
+        return -1;
+    } else {
+        return distance;
+    }
+}