File content as of revision 3:c3f4ce50902f:

#ifndef AD7989_H
#define AD7989_H

#include "mbed.h"
/** An abstraction for an 18 bit ADC
*  @note Not quite sure this is thread or interrupt safe. Treat this as a standard mbed SPI object
*  There are mutex locks when the SPI bus is being used.
*  Example
*  @code
*  #include "mbed.h"
*  #include "AD7989_Driver.h"
*
*  SPI spi(p5, p6, p7); // mosi, miso, sclk
*  DigitalOut cs(p8);
*  Digitalout convert(p9);
*  AD7989_Driver ADCDEV(&spi, &cs, &convert);
*  double voltage;
*  int main()
*  {
*    while(1)
*    {
*      voltage = ADCDEV.sample();
*      printf("Voltage = %f Volts", voltage);
*    }
*  }
*/
class AD7989_Driver
{
public:
  /** Constructor for AD7989_Drive object
  *
  *  @param SPI_BUS this is the SPI bus the AD7989 is one
  *  @param Chip_Select this is the DigitalOut outline connected to CS pin
  *  @param Convert this is the DigitalOut pin that is connected to the CONV pin
  */
  AD7989_Driver(SPI *SPI_BUS, DigitalOut *Chip_Select, DigitalOut *Convert);
  /** Function returns the voltage on the AD7989 as a double
  *  The value the function will return will be from -5.0V to 5.0V
  */
  double sample();
  /** Averages a number of samples the use specifies
  *
  *  @param num_avgs The number of samples to average
  */
  double sample_avg(int num_avgs);

  float volts;
private:
  static const float zero_point;
  SPI *ADC_SPI;
  DigitalOut *CS;
  DigitalOut *ADC_CONV;
};

#endif