DA Calibration Verification

Table of contents

1 Description 2 Step-By-Step Instructions 3 Example of Usage for D/A Calibration Verification 4 Example of Usage for D/A Calibration Verification in Helios

Description

On supported boards (-AT boards), after performing a D/A autocalibration, you can verify the accuracy of the calibration. This function will return the offset and gain error of each range in LSBs.

The default D/A calibration tolerance for all boards is +/-2LSBs. In general autocalibration will result in errors of +/-1LSB or less.

Step-By-Step Instructions

Create and initialize a D/A auto-calibration settings structure (DSCDACALPARAMS).

Call dscDACalVerify() and pass it a pointer to this structure in order to verify the D/A calibration of the board. The elements offset and gain of DSCDACALPARAMS will contain the error in LSB counts for D/A operations. Values of less than 2 are within tolerance.

Example of Usage for D/A Calibration Verification

...
DSCB dscb;
DSCDACALPARAMS dscdacalparams;
BYTE result;

...

/* Step 1 - verify the programmable range calibration from previous example */
dscdacalparams.da_range = 4.096;

/* Step 2 */
if ((result = dscDACalVerify(dscb, &dscdacalparams)) != DE_NONE)
   return result;
...

Example of Usage for D/A Calibration Verification in Helios

DSCB dscb; DSCDACALPARAMS dscdacalparams; BYTE result; ...

        dscInit( DSC_VERSION ) ;

        dsccb.base_address = 0x280;

        dsccb.int_level = 5;

        dscInitBoard(DSC_HELIOS, &dsccb, &board);

        dacalparams.darange_calibrate = i;

        result = dscDACalVerify( board, &dacalparams) ;

...