Revision 5:cbe07c09c64c, committed 2014-07-29

Comitter:

d34d

Date:

Tue Jul 29 02:34:02 2014 +0000

Parent:

4:ddffe9339bb1

Commit message:

Add user defined delay between continuous readings.

Changed in this revision

--- a/ping.cpp	Mon Jul 28 00:17:57 2014 +0000
+++ b/ping.cpp	Tue Jul 29 02:34:02 2014 +0000
@@ -1,7 +1,8 @@
 #include "ping.h"
 
 Ping::Ping(PinName signalPin) : mSignalIo(signalPin), mEvent(signalPin), 
-        mBusy(0), mValid(0), mContinuous(0), mTimer(), mRawReading(0) {
+        mBusy(0), mValid(0), mContinuous(0),
+        mDelayBetweenReadings(DEFAULT_MEASUREMENT_DELAY_US), mTimer(), mRawReading(0) {
     mEvent.rise(this, &Ping::start);
     mEvent.fall(this, &Ping::stop);
 }
@@ -39,7 +40,7 @@
     mRawReading = mTimer.read_us() >> 1;
     mTimer.stop();
     mCallback.call(mRawReading);
-    if (mContinuous) mMeasureDelayTicker.attach_us(this, &Ping::nextMeasurement, 5000);
+    if (mContinuous) mMeasureDelayTicker.attach_us(this, &Ping::nextMeasurement, mDelayBetweenReadings);
 }
 
 void Ping::nextMeasurement() {

--- a/ping.h	Mon Jul 28 00:17:57 2014 +0000
+++ b/ping.h	Tue Jul 29 02:34:02 2014 +0000
@@ -4,9 +4,9 @@
 #include "mbed.h"
 #include "FPointer.h"
 
-#define MEASUREMENT_DELAY_US        200
-#define SPEED_OF_SOUND_CM_PER_US    0.034029
-#define SPEED_OF_SOUND_IN_PER_US    0.0133972441
+#define DEFAULT_MEASUREMENT_DELAY_US    5000
+#define SPEED_OF_SOUND_CM_PER_US        0.034029
+#define SPEED_OF_SOUND_IN_PER_US        0.0133972441
 
 /**
  * Class for interfacing with the Parallax Ping))) Ultrasonic Sensor
@@ -58,6 +58,13 @@
         uint32_t getRawReading() { return mRawReading; }
         
         /**
+         * Sets the delay between continuous readings.
+         *
+         * @param delay_us Delay between readings in microseconds.
+         */
+        void setContinuousReadingDelay(uint32_t delay_us) { mDelayBetweenReadings = delay_us; }
+        
+        /**
          * Gets the distance sound can travel, in centimeters, for a given time in uS.
          *
          * @param time_us Time traveled in microseconds.
@@ -96,6 +103,7 @@
         bool mBusy;
         bool mValid;
         bool mContinuous;
+        uint32_t mDelayBetweenReadings;
         
         Timer mTimer;
         Ticker mMeasureDelayTicker;