ADCSensor.h

00001 /* ADCSensor.h
00002  * Tested with mbed board: FRDM-KL46Z
00003  * Author: Mark Gottscho
00004  * mgottscho@ucla.edu
00005  */
00006 
00007 #ifndef ADCSensor_H
00008 #define ADCSensor_H
00009 
00010 #include "mbed.h"
00011 #include "PeriodicSensor.h"
00012 
00013 class ADCSensor : public PeriodicSensor {
00014     public:
00015         /**
00016          * Constructs an ADCSensor.
00017          * @param adc_pin the ADC pin to use
00018          */
00019         ADCSensor(PinName adc_pin);
00020         
00021         ~ADCSensor();
00022         
00023         /**
00024          * @param sampleNow if true, samples the ADC returns it. if false, gets the last sampled value.
00025          * The latter is preferred if this object is set up to sample using interrupts.
00026          * @returns a raw ADC reading
00027          */
00028         uint16_t getSample(bool sampleNow);
00029         
00030         /**
00031          * @param sampleNow if true, samples the ADC returns it. if false, gets the last sampled value.
00032          * The latter is preferred if this object is set up to sample using interrupts.
00033          * @returns the ADC reading in Volts
00034          */
00035         float getSampleFloat(bool sampleNow);
00036         
00037     private:
00038         /**
00039          * Interrupt service routine for sampling the ADC.
00040          */
00041         virtual void __sample_data_ISR();
00042         
00043         AnalogIn __adc;
00044         volatile uint16_t __data;
00045         
00046         const static float ADC_DIV = 0.00005035; //Volts/level
00047 };
00048 
00049 #endif