Diff: PulseManager.h

Revision:

0:67bcc374fa16

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/PulseManager.h	Mon Aug 03 18:26:05 2015 +0000
@@ -0,0 +1,80 @@
+#ifndef MBED_PULSEMANAGER_H
+#define MBED_PULSEMANAGER_H
+
+#include "mbed.h"
+
+class PulseManager   {
+    public:
+        /** 
+        * Create a PulseManager object connected to the specified pin
+        * @param triggerPin output pin to use for generating a trigger signal
+        * @param echoPin input pin to use for measuring an echo signal
+        */
+        PulseManager(PinName triggerPin, PinName echoPin);
+        
+        /**
+        * Destructor to free allocated memory
+        */
+        ~PulseManager();
+        
+        /** 
+        * Set the value of the trigger pin
+        * @param val Value to set, 0 for LOW, otherwise HIGH
+        */
+        void write(int val);
+        
+        /** 
+        * Send a pulse of a given value for a specified time
+        * @param val Value to set, 0 for LOW, otherwise HIGH
+        * @param time Length of pulse in microseconds
+        */
+        void write_us(int val, int time);
+        
+        /** 
+        * Return the length of the next HIGH pulse in microsconds
+        */
+        int read_high_us();
+        
+        /** 
+        * Return the length of the next HIGH pulse in microseconds or -1 if longer than timeout
+        * @param timeout Time before pulse reading aborts and returns -1, in microseconds
+        */
+        int read_high_us(int timeout);
+        
+        /** 
+        * Return the length of the next LOW pulse in microsconds
+        */
+        int read_low_us();
+        
+        /** 
+        * Return the length of the next LOW pulse in microseconds or -1 if longer than timeout
+        * @param timeout Time before pulse reading aborts and returns -1, in microseconds
+        */
+        int read_low_us(int timeout);
+        
+        /** 
+        * Return the length of the next pulse in microsconds
+        */
+        int read_us();
+        
+        /** 
+        * Return the length of the next pulse in microseconds or -1 if longer than timeout
+        * @param timeout Time before pulse reading aborts and returns -1, in microseconds
+        */
+        int read_us(int timeout);
+        
+    private:
+    
+        /** Start value for echo pin to use for detecting a change */
+        int startval;
+        /** Timer for measuring pulse width */
+        Timer pulsetime;
+        /** Timer for detecting a timeout */
+        Timer runtime;
+        /** Pin handle for trigger pin */
+        DigitalOut trigger;
+        /** Pin handle for echo pin */
+        DigitalIn  echo;
+};
+
+#endif
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