void usb1208ls_ReadAnalogueOut (acqchanPtr acqchan)
{
portPtr up = acqchan->upLvl;
MCCdevPtr dev = acqchan->dev;
sourcePtr src = up->port.analogueIOport.IO.source;
float temp;
unsigned short reading;
cbFromEngUnits(dev->BoardNum, up->port.analogueIOport.range, src->biaslevel, &reading);
cbToEngUnits (dev->BoardNum, up->port.analogueIOport.range, reading, &temp);
acqchan->reading = (double)temp * 4; // due to bug in MCC!!!
acqchan->newreading = TRUE;
}
void main ()
{
/* Variable Declarations */
int ch;
int Row, Col;
int BdNum = 0;
int DevNum = 0;
int ConfigVal = 0;
int ULStat = 0;
int Gain = BIP10VOLTS;
int chan, ExitFlag;
WORD DataValue;
float volts;
/* Initiate error handling
Parameters:
PRINTALL :all warnings and errors encountered will be printed
DONTSTOP :program will continue even if error occurs.
Note that STOPALL and STOPFATAL are only effective in
Windows applications, not Console applications.
*/
cbErrHandling (PRINTALL, DONTSTOP);
// Initialize output to ground.
// Note that the default behavior is to update D/A's immediately
// upon cbAOut or cbAOutScan.
volts = 0.0;
chan = 0;
ULStat = cbFromEngUnits(BdNum, Gain, volts, &DataValue);
ULStat = cbAOut (BdNum, chan, Gain, DataValue);
// Set DAC Update mode to hold off updating D/A's until issued Update Command
// Parameters
// BOARDINFO : General information about the board
// BdNum : Number used by CB.CFG to describe this board
// DevNum : Selects device; in this case, selects D/A channel to configure
// Note that -1 selects all D/A channels
// BIDACUPDATEMODE : Selects update mode for D/A, whether immediately (via cbAOut
// or cbAOutScan) or upon issuing BIDACUPDATECMD
// UPDATEONCOMMAND : Delay D/A output updates from cbAOut or cbAOutScan until
// BIDACUPDATECMD is issued.
DevNum = ALLDEVICES;
ULStat = cbSetConfig(BOARDINFO, BdNum, DevNum, BIDACUPDATEMODE, UPDATEONCOMMAND);
ExitFlag = FALSE;
while (!ExitFlag)
{
// Set up the display screen
ClearScreen();
printf ("Demonstration of DAC Update Modes with cbAOut()\n\n");
GetTextCursor (&Col, &Row);
MoveCursor (0, 3);
printf ("Enter a voltage between -10.0 and +10.0: ");
MoveCursor (41, 3);
if (0==scanf ("%f", &volts))
{
printf("Error : Invalid entry.");
break;
}
ULStat = cbFromEngUnits(BdNum, Gain, volts, &DataValue);
ULStat = cbAOut (BdNum, chan, Gain, DataValue);
printf ("\n %.2f volts has been sent to D/A 0.\n\n", volts);
printf ("Press U to update D/A output, Q to quit, \n or any other key to continue:\n ");
while (!kbhit()){}
ch=getch();
if (ch=='q' || ch=='Q')
ExitFlag=TRUE;
else if (ch=='u' || ch=='U')
{
// Issue command to update all the D/A's with the last value written
// to them via cbAOut or cbAOutScan
//
// Parameters
// BOARDINFO : General information about the board
// BdNum : Number used by CB.CFG to describe this board
// DevNum : Not used for BIDACUPDATECMD
// BIDACUPDATECMD : Update D/A outputs with last value written
// ConfigVal : Note used for BIDACUPDATECMD
DevNum = NOT_USED;
ConfigVal = NOT_USED;
ULStat = cbSetConfig(BOARDINFO, BdNum, DevNum, BIDACUPDATECMD, ConfigVal);
printf("\nD/A output 0 has been updated. ");
}
else
printf("\nD/A output 0 has not been updated!");
}
printf ("\n");
}
