got angle sensor reading

Examples/Arduino/a1335_example/lib/A1335/A1335.h

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+/***************************************************
+  Arduino library for the Allegro A1335 Magnetic angle sensor
+  The A1335 sensor detects the absolute angular position of a 
+  permanent magnet, typically a diametrically
+  magnetized cylinder on the rotating shaft.
+
+  * by Florian von Bertrab
+ ****************************************************/
+
+#ifndef A1335_H
+#define A1335_H
+
+#if (ARDUINO >= 100)
+     #include "Arduino.h"
+#else
+     #include "WProgram.h"
+#endif
+#include <Wire.h>
+
+class bytes_2 { // allows easy conversion from two bytes in a given order to a 16 bit int.
+public:
+  bytes_2();
+  bytes_2(int16_t integ);
+
+  int16_t&   in();
+  byte&      lsBy(byte n);
+  byte&      msBy(byte n);
+
+private:
+  union     {
+    int16_t integer;
+    byte    bytes[2];
+  }data;
+};
+
+class bytes_4 { // allows easy conversion from four bytes in a given order to a 32 bit int.
+
+public:
+  bytes_4();
+  bytes_4(int32_t integ);
+
+  int32_t&   in();
+  byte&      lsBy(byte n);
+  byte&      msBy(byte n);
+
+private:
+  union     {
+    int32_t integer;
+    byte    bytes[4];
+  }data;
+};
+
+class A1335 {
+public:
+  A1335();  
+
+  byte      start(int16_t address_);	// starts the sensor at the given address
+  
+  int16_t   getAddress();			// returns I2C address
+  byte      getProcessorState();		// returns processor state:
+							// 0 = booting; 1 = idle; 2 = running; 3 = self-test mode; 4 = not found
+
+  byte      getOutputRate();		// returns the log2() of the samperate. E.g. 3 would mean 8 samples per data point.
+
+  
+  double    readAngle();			// returns the angle in degrees
+
+  uint16_t  readAngleRaw();			// returns raw angle data (4096 = 360<36>)
+
+  double    readTemp();			// returns temperature in Kelvin
+
+  uint16_t  readTempRaw();			// returns raw temperature data 8 = 1 K
+
+  double    readField();			// returns field strenght in Tesla
+
+  uint16_t  readFieldRaw();			// returns raw field strenght data 10 = 1mT
+
+
+  byte      readOutputRate();		// reads the log2() of the sample rate. Does not really work yet!
+
+  byte      setOutputRate(byte rate);// sets the log2() of the sample rate => (ORate = 2^rate). Does not really work yet!
+  
+  byte      normalWrite(byte reg, int16_t data); // writes 16 bit to a given register
+
+  int16_t   normalRead(byte reg);			 // reads 16 bit from a given register
+
+  
+  byte      extendedWrite(int16_t reg, int32_t data); // writes 32 bit to a given extended register
+
+  int32_t   extendedRead(int16_t reg);			 // reads 32 bit from a given extended register
+
+
+private:
+  int16_t   address = 0x0C;             // I2C address
+  byte      processorState = 4;         // 0 = booting; 1 = idle; 2 = running; 3 = self-test mode; 4 = not found
+  byte      outputRate = 0;                 // log2() of the sample rate in the EEPROM
+};
+
+#endif //A1335_H