TouchSensor.h

00001 /* TouchSensor.h
00002  * Tested with mbed board: FRDM-KL46Z
00003  * Author: Mark Gottscho
00004  * mgottscho@ucla.edu
00005  */
00006 
00007 #ifndef TOUCHSENSOR_H
00008 #define TOUCHSENSOR_H
00009 
00010 #include "mbed.h"
00011 #include "TSISensor.h"
00012 #include "PeriodicSensor.h"
00013 
00014 class TouchSensor : public PeriodicSensor {
00015     public:
00016         /**
00017          * Initialize the touch sensor
00018          */
00019         TouchSensor();
00020         
00021         /**
00022          * Destroy the touch sensor
00023          */
00024         ~TouchSensor();
00025         
00026         /**
00027          * Read Touch Sensor percentage value.
00028          * @param sampleNow if true, queries the device for the sample and returns it. if false, gets the last queried value.
00029          * @returns percentage value between [0 ... 1]
00030          */
00031         float getPercentage(bool sampleNow);
00032         
00033         /**
00034          * Read Touch Sensor distance
00035          * @param sampleNow if true, queries the device for the sample and returns it. if false, gets the last queried value.
00036          * @returns distance in mm. The value is between [0 ... 40]
00037          */
00038         uint8_t getDistance(bool sampleNow);
00039         
00040     private:
00041         /**
00042          * Interrupt service routine for sampling the touch sensor.
00043          */
00044         virtual void __sample_data_ISR();
00045     
00046         TSISensor __sensor;
00047         
00048         volatile uint8_t __distance;
00049         volatile float __percentage;
00050 };
00051 
00052 #endif