AD7730.h

00001 #ifndef AD7730_H
00002 #define AD7730_H
00003 
00004 #include "mbed.h"
00005 
00006 class AD7730{
00007 
00008     public:
00009         AD7730(PinName mosi, PinName miso, PinName sclk, PinName ready, PinName cs);
00010         ~AD7730(void);
00011         
00012         int readRegistry(int registry);
00013         int writeRegistry(int registry, int value);
00014         int initialize(void);
00015         int systemLowCal(double wgt);
00016         int systemHighCal(double wgt, double fullScale);
00017         int read();
00018         int startConversion(bool wait); 
00019         void setFilter(int SF, bool chop, int filter2);
00020         void setFilterSF(int SF);
00021         void setFilterMode(int mode);
00022         void setFilterChop(int enabled);
00023         void reset(bool fullReset);
00024         int adjustDAC(int direction);
00025         void start(void);
00026         void stop(void);
00027         bool isReady(void);
00028         double getHz(void);
00029 
00030     
00031     private:
00032     
00033         SPI _spi;
00034         DigitalOut _cs;
00035         DigitalIn _readyDig;
00036         DigitalOut _LED3;
00037         InterruptIn *_interruptReady;
00038         PinName  _readyPin;
00039         double _fullScaleWeight;
00040         double _minWeight;
00041         double _maxWeight;
00042         int _readBuffer[100];
00043         int _bufferCount;
00044         int _lastValue;
00045         bool _continous;
00046         int _frequency;
00047         Timer _tmr;
00048         
00049         //Registry value constants
00050         static const int STATUS_REG = 0;
00051         static const int DATA_REG = 1;
00052         static const int MODE_REG = 2;
00053         static const int FILTER_REG = 3;
00054         static const int DAC_REG = 4;
00055         static const int OFFSET_REG = 5;
00056         static const int GAIN_REG = 6;
00057         static const int TEST_REG = 7;
00058         
00059         //define empty spi command
00060         static const int EMPTY_SPI = 0xFF;
00061         
00062         //internal registries
00063         int _mode;
00064         int _filter;
00065         int _dac;
00066         int _offset;
00067         int _gain;
00068         
00069         
00070         //timing variables
00071         Timer _exeTmr;
00072         int _exeTime;
00073         
00074         //error variables
00075         int _exeError;
00076         
00077         //private functions
00078         int internalZeroCal(void);
00079         int internalFullCal(void); 
00080         void interruptRead(void);       
00081         
00082         
00083 };
00084 
00085 #endif