/* This program calculates calibration constants for the Dataq DI194RS serial */
/* data acquisition device.                                                   */

#include <unistd.h>

#include "DI194RS.h"

int main(void)
{
  dataqsdk DI194;
  int ChannelList[MAXCHANNELS] = { 0, 1, 2, 3 };
  int MethodList[MAXCHANNELS]  = { 0, 0, 0, 0 };
  short int offsets[MAXCHANNELS];
  short int samplebuf[MAXCHANNELS];
  float scalefactors[MAXCHANNELS];
  bool status;
  long int count;
  int i;

/* Display startup banner */

  printf("Dataq DI194RS Calibrator\n");

/* Set up for the data acquisition */

  DI194.ProductName(PRODUCTNAME);
  SDKerror(&DI194, "ProductName", TRUE);

  DI194.DeviceFile(SERIALPORT);
  SDKerror(&DI194, "DeviceFile", TRUE);

  DI194.ADChannelCount(4);
  SDKerror(&DI194, "ADChannelCount", TRUE);

  DI194.ADChannelList(ChannelList);
  SDKerror(&DI194, "ADChannelList", TRUE);

  DI194.ADMethodList(MethodList);
  SDKerror(&DI194, "ADMethodList", TRUE);

  DI194.SampleRate(1.0);
  SDKerror(&DI194, "SampleRate", TRUE);

  DI194.EventPoint(1);
  SDKerror(&DI194, "EventPoint", TRUE);

/******************************************************************************/

/* Calibrate with 0.0 V input */

  printf("\nConnect all analog inputs to 0.0V (GROUND) and press ENTER...");
  fflush(stdout);
  getchar();

/* Start data acquisition */

  DI194.Start();
  SDKerror(&DI194, "Start", TRUE);

/* Read analog inputs */

  status = DI194.NewData(count);
  SDKerror(&DI194, "NewData", TRUE);
  if (status)
  {
    DI194.GetDataEx(offsets, MAXCHANNELS);
    SDKerror(&DI194, "GetDataEx", TRUE);
    for (i = 0; i < MAXCHANNELS; i++) offsets[i] &= DATAMASK;
  }

/* Stop data acquisition */

  DI194.Stop();
  SDKerror(&DI194, "Stop", TRUE);

  printf("Sampled values are: %d %d %d %d\n",
         offsets[0], offsets[1], offsets[2], offsets[3]);
  fflush(stdout);

/******************************************************************************/

/* Calibrate with 9.0 V input */

  printf("\nConnect all analog inputs to 9.0V and press ENTER...");
  fflush(stdout);
  getchar();

/* Start data acquisition */

  DI194.Start();
  SDKerror(&DI194, "Start", TRUE);

/* Read analog inputs */

  status = DI194.NewData(count);
  SDKerror(&DI194, "NewData", TRUE);
  if (status)
  {
    DI194.GetDataEx(samplebuf, MAXCHANNELS);
    SDKerror(&DI194, "GetDataEx", TRUE);
    for (i = 0; i < MAXCHANNELS; i++) samplebuf[i] &= DATAMASK;
  }

/* Stop data acquisition */

  DI194.Stop();
  SDKerror(&DI194, "Stop", TRUE);

  printf("Sampled values are: %d %d %d %d\n",
         offsets[0], offsets[1], offsets[2], offsets[3]);
  fflush(stdout);

/* Calculate scale factors */

  for (i = 0; i < MAXCHANNELS; i++)
    scalefactors[i] = 9.0/(samplebuf[i] - offsets[i]);

  printf("Calculated scale factors are: %e %e %e %e\n",
         scalefactors[0], scalefactors[1], scalefactors[2], scalefactors[3]);
  fflush(stdout);

  SaveCalibration(offsets, scalefactors);
  exit(0);
}