Bug fix for issue #261, 18AI32SSC1M going to 16bit mode.

src/include/drv/gsc_adc_common.c

@@ -45,7 +45,7 @@ gscDisableAdcClk( CDS_HARDWARE* pHardware, int card )
             _adcPtr[ ii ]->SSC &= ~( GSAI_ENABLE_CLOCK );
         if ( pHardware->adcType[ ii ] == GSC_18AI64SSC )
             _adcPtr[ ii ]->SSC &= ~( GSAI_CLOCK_ENABLE );
-        _adcPtr[ ii ]->IDBC = ( GSAI_CLEAR_BUFFER | GSAI_THRESHOLD );
+        _adcPtr[ ii ]->IDBC |= ( GSAI_CLEAR_BUFFER | GSAI_THRESHOLD );
     }
 }
 
@@ -78,7 +78,7 @@ gscEnableAdcModule( CDS_HARDWARE* pHardware, int card, int dmamode )
     {
         /// Clear the FIFO and set demand DMA to start after all 32 channels
         /// have 1 sample
-        _adcPtr[ ii ]->IDBC = ( GSAI_CLEAR_BUFFER | GSAI_THRESHOLD );
+        _adcPtr[ ii ]->IDBC |= ( GSAI_CLEAR_BUFFER | GSAI_THRESHOLD );
         // Normal operation is to enable DMA mode. 
         // Not setting DMA mode is used in some test routines.
         if ( dmamode )