Diff: Ultrasonic.cpp

Revision:

0:c7db0e6e8f0e

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Ultrasonic.cpp	Sat Nov 01 21:00:57 2014 +0000
@@ -0,0 +1,72 @@
+/*
+ * Ultrasonic.cpp
+ * A library for ultrasonic ranger
+ *
+ * Copyright (c) 2012 seeed technology inc.
+ * Website    : www.seeed.cc
+ * Author     : LG, FrankieChu
+ * Create Time: Jan 17,2013
+ *
+ * Change Log :
+ *   adapted to ARM mbed by Guido Grassel, Oct 2014
+ *
+ * The MIT License (MIT)
+ *
+ * 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 "Ultrasonic.h"
+
+Ultrasonic::Ultrasonic(PinName pin)
+    : _pin(pin)
+{
+}
+
+/*The measured distance from the range 0 to 400 Centimeters*/
+long Ultrasonic::measureInCentimeters(void)
+{
+    _pin.output();
+    _pin = 0; // digitalWrite(_pin, LOW);
+    wait_us(2); //  delayMicroseconds(2);
+    _pin = 1; //  digitalWrite(_pin, HIGH);
+
+    wait_us(5);     //delayMicroseconds(5);
+    _pin = 0;      //digitalWrite(_pin,LOW);
+    _pin.input();   // pinMode(_pin,INPUT);
+    long duration;
+    duration = pulseIn();
+    long RangeInCentimeters;
+    RangeInCentimeters = duration/29/2;
+    return RangeInCentimeters;
+}
+
+long Ultrasonic::pulseIn(void) {
+    Timer tmr;
+    _pin.input();
+    while (_pin!=1) {
+        ;    // wait for high
+    }
+    tmr.start();
+    while (_pin!=0) {
+        ;    // wait for low
+    }
+    int duration = tmr.read_us();
+    tmr.stop();
+    return (long) duration;
+}