Revision 8:a7680a852da3, committed 2017-08-25

Comitter:

dudu941014

Date:

Fri Aug 25 21:01:39 2017 +0000

Parent:

7:71da0dbf4400

Commit message:

this is a new module for distance sensor;

Changed in this revision

diff -r 71da0dbf4400 -r a7680a852da3 hcsr04.cpp
--- a/hcsr04.cpp	Sat Mar 30 18:55:03 2013 +0000
+++ b/hcsr04.cpp	Fri Aug 25 21:01:39 2017 +0000
@@ -1,22 +1,15 @@
-/* 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.
- */
-
+//////////////////////////////////////////////////////////////////////////////////
+// Company: edinburgh of university
+// Engineer: ZEjun DU
+// 
+// Create Date: 2017/08/20 13:06:52
+// Design Name: Inverted Pendulum Balancer
+// Module Name: distance sensor
+// Tool Versions: “Keil 5” or “Mbed Complie Online”
+// Description: this part is basic function of position to get distance from distance sensor hcsr04.cpp
+//                           
+// 
+//////////////////////////////////////////////////////////////////////////////////
 
 #include "hcsr04.h"
 
@@ -39,19 +32,27 @@
 {
     pulsetime.start();
 }
+
+////////////////////////////////////////////////////////////
+//this funcition is to trigger the distance sensor
+//after triggering, the distance sensor will send a 40KHz signal
+////////////////////////////////////////////////////////////
 void HCSR04::start(void)
 {
     trigger=1;
-    wait_us(10);
+    wait_us(12);
     trigger=0;
 }
 
+////////////////////////////////////////////////////////////
+//this funcition is to calculate the distance according the high level time of the ENCH pin
+////////////////////////////////////////////////////////////
 void HCSR04::isr_fall(void)
 {
-    pulsetime.stop();
-    pulsedur = pulsetime.read_us();
-    distance= (pulsedur*343)/20000;
-    pulsetime.reset();
+    pulsetime.stop();//stop the pulsetime
+    pulsedur = pulsetime.read_us();//read the high level time
+    distance= (pulsedur*343)/20000;//calculate the distance according to the high level time
+    pulsetime.reset();//reset the variable
 }
 
 void HCSR04::rise (void (*fptr)(void))

diff -r 71da0dbf4400 -r a7680a852da3 hcsr04.h
--- a/hcsr04.h	Sat Mar 30 18:55:03 2013 +0000
+++ b/hcsr04.h	Fri Aug 25 21:01:39 2017 +0000
@@ -1,25 +1,15 @@
-/* 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.
- *
- * For more details on the sensor :
- * http://www.elecfreaks.com/store/hcsr04-ultrasonic-sensor-distance-measuring-module-p-91.html?zenid=pgm8pgnvaodbe36dibq5s1soi3
- *
- * 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.
- */
+//////////////////////////////////////////////////////////////////////////////////
+// Company: edinburgh of university
+// Engineer: ZEjun DU
+// 
+// Create Date: 2017/08/20 13:06:52
+// Design Name: Inverted Pendulum Balancer
+// Module Name: distance sensor
+// Tool Versions: “Keil 5” or “Mbed Complie Online”
+// Description: this part is basic function of position to get distance from distance sensor hcsr04.cpp
+//                           
+// 
+//////////////////////////////////////////////////////////////////////////////////
 
 #ifndef MBED_HCSR04_H
 #define MBED_HCSR04_H
@@ -63,6 +53,10 @@
     InterruptIn echo;
     unsigned int pulsedur;
     unsigned int distance;
+//    float pulsedur;
+//    float distance;
+    
+    
 };
 
 #endif
\ No newline at end of file