I want to let NI PCIE-6341 synchronize with other high speed DAQ.
The high speed DAQ will be the master clock, and NI PCIE-6341 will be slave clock.
The frequency of the clock output from high speed DAQ is 312,500Hz.
And this TTL signal is sent to port PFI0 in the NI PCIE-6341.
And how to let my code be suitable for synchronize all system.
My code is here:
//Confige the NI card
DAQmxErrChk(DAQmxCreateTask("MEMS driving trigger", &taskHandle));
DAQmxErrChk(DAQmxCreateAOVoltageChan(taskHandle, "Dev1/ao0", "X-axis driving trigger", -10.0, 10.0, DAQmx_Val_Volts, NULL));
DAQmxErrChk(DAQmxCreateAOVoltageChan(taskHandle, "Dev1/ao1", "Y-axis driving trigger", -10.0, 10.0, DAQmx_Val_Volts, NULL));
DAQmxErrChk(DAQmxCreateTask("MEMS filter clk", &taskHandlefilter));
DAQmxErrChk(DAQmxCreateTask("MEMS TTL", &taskHandleTTL));
if (taskHandlefilter != 0 && taskHandle != 0 && taskHandleTTL!=0) {
running = true;
float64 framerate = float64(_Gcd(ntuscope->xfreq, ntuscope->yfreq));
samplingRate = int(samplingRate / framerate) * framerate;
total_samples = int(samplingRate / framerate);
cout << "NI Sampling rate: " << samplingRate << endl;
cout << "NI total sample: " << total_samples << endl;
cout << "Frame rate: " << framerate << endl;
//MEMS input setup
lissajousdata = new float64[total_samples * 2];
NIgenerateSineWave(lissajousdata, total_samples, (0.75* ntuscope->MEMS_amp), ntuscope->xfreq,0, samplingRate, ntuscope->xoffset, 0);
NIgenerateSineWave(lissajousdata, total_samples, ntuscope->MEMS_amp, ntuscope->yfreq,0, samplingRate, ntuscope->yoffset, 1);
DAQmxErrChk(DAQmxCfgSampClkTiming(taskHandle, "", samplingRate, DAQmx_Val_Rising, DAQmx_Val_ContSamps, total_samples));
DAQmxErrChk(DAQmxWriteAnalogF64(taskHandle, total_samples, FALSE, DAQmx_Val_WaitInfinitely, DAQmx_Val_GroupByScanNumber, lissajousdata, NULL, NULL));
//MEMS TTL setup
DAQmxErrChk(DAQmxCreateDOChan(taskHandleTTL, "Dev1/port0/line0", "", DAQmx_Val_ChanPerLine));
DAQmxErrChk(DAQmxCfgSampClkTiming(taskHandleTTL, "/Dev1/ao/SampleClock", samplingRate, DAQmx_Val_Rising, DAQmx_Val_ContSamps, total_samples));
ttldata = new uInt8[total_samples];
int risingEdgeDelaySamples = static_cast<int>(samplingRate * NItriggerdelay);
for (int i = 0; i < total_samples; i++) {
if (i >= risingEdgeDelaySamples && i < risingEdgeDelaySamples + int(total_samples / 2)) {
ttldata[i] = 1;
}
else {
ttldata[i] = 0;
}
}
DAQmxErrChk(DAQmxWriteDigitalLines(taskHandleTTL, total_samples, FALSE, 10, DAQmx_Val_GroupByScanNumber, ttldata, NULL, NULL));
/
/MEMS filter clk setup
DAQmxErrChk(DAQmxCreateCOPulseChanFreq(taskHandlefilter, "Dev1/ctr1", "filter clk", DAQmx_Val_Hz, DAQmx_Val_Low, 0.0, MEMScutofffreq, 0.5));
DAQmxErrChk(DAQmxCfgImplicitTiming(taskHandlefilter, DAQmx_Val_ContSamps, total_samples));
DAQmxErrChk(DAQmxCfgDigEdgeStartTrig(taskHandlefilter, "/Dev1/ao/SampleClock", DAQmx_Val_Rising));
DAQmxErrChk(DAQmxSetTrigAttribute(taskHandlefilter, DAQmx_StartTrig_Retriggerable, TRUE));
return true;
}
else {
return false;
}
