[USB-1808x, analog output retriggering and BIDACTRIGCOUNT]

Hi JRys, thanks for looking into this.  I understand that BIDACTRIGCOUNT is the number of samples - in my example numTriggerSamples is the number of samples that I want to output with each trigger.

I don't understand what you're seeing that is indicating that BIDACTRIGCOUNT is not supported by the USB-1808.  I am looking at the universal library help, and it specifically says that this is supported:

 

 

[USB-1808x, analog output retriggering and BIDACTRIGCOUNT]

I have a USB-1808x, and would like to set up an analog output scan that contains N*M samples.  For each input trigger, output N samples, and after M triggers, restart at the beginning.  Is this possible?  I have it working fine with M=1, but the BIDACTRIGCOUNT setting does not seem to have any effect when I try to have a single output scan cross multiple triggers.  Instead, it simply outputs the entire scan on every trigger.

Here is a simplified version of my code showing what I am trying to do:

long rate = 10000;
int numTriggerSamples = 1000;
int numTriggers = 5;
int numTotalOutputSamples = numTriggerSamples * numTriggers;

HGLOBAL winbuf = cbWinBufAlloc(numTotalOutputSamples);
unsigned short *dataArray = (unsigned short*)winbuf;
for (int i=0; i<numTotalOutputSamples; i++) {
  cbFromEngUnits(boardNum, BIP10VOLTS, (float)i / numTotalOutputSamples, &dataArray[i]);
}

ULStat = cbSetTrigger(boardNum, TRIG_POS_EDGE, 0, 0);
if (ULStat != NOERRORS) {
  return;
}

ULStat = cbSetConfig(BOARDINFO, boardNum, 0, BIDACTRIGCOUNT, numTriggerSamples);
if (ULStat != NOERRORS) {
  return;
}

int options = BACKGROUND | EXTTRIGGER | CONTINUOUS | RETRIGMODE;
ULStat = cbAOutScan(boardNum, 0, 0, numTotalOutputSamples, &rate, BIP10VOLTS, winbuf, options);

if (ULStat != NOERRORS) {
  return;
}

cbWinBufFree(winbuf);

 

[USB-234 and RetrigMode]

I have a USB-234 that I am trying to use to output a waveform every time an input trigger is received.  I am using the C Universal Library.  I am able to use cbSetTrigger() and cbAOutScan() to configure the trigger and output the waveform when the trigger is received using options=BACKGROUND | EXTTRIGGER | CONTINUOUS;  When doing this, the waveform repeats forever after the first trigger is received.  When adding RETRIGMODE to the options, I get error 52 "Invalid option specified for this function".  I don't understand what I am doing wrong, since the documentation for cbAOutScan() seems pretty clear about how to use this option.  Using cbSetConfig() to set BIDACTRIGCOUNT does not have any affect on the error that I am getting.  Does this board simply not support this option? 

Thanks,

John