How to re-route source & gate for Buffered Period in DAmx

Question

I am trying to write a DAQmx program that does the follow :
(1) creates 1 PulseTrain task; this task routes is output to a requested pin with will be used as a SOURCE for a Buffered Period task.
(2) if requested creates a second PulseTrain who's output will be used as the Buffered Period GATE.
(3) the Buffered period task needs to assign ANY SOURCE,GATE and run till its stopped by the user.
Note that this task needs to "sample/read" its data and show it to the user.
My questions are :
(a) is the PulseTrain "output" re-route done OK ?
(b) how to re-route the Period source/gate - I used DAQmxSetChanAttribute, but I an not sure it is right
©) how to make the Period task write the data into "my program buffer" so I do not have to read it when "stop" is pressed.
I try to run with simulated devices on a P4 3.2GHZ running XP :
First TrainPulse - ctr0, out->RSTI0
Second TrainPulse - ctr1, out->RSTI1
Period - ctr2, source=RSTI1, gate=RSTI0
Running this program with a SIMULATED device - OK (data = 0). with the real device - I get error -200141
I included my code.
Attachments:
DaQmx test.zip ‏147 KB

Answer 1

I have a new question
I need to create an event buffered task when the source=80mhz internal card timebase, gate=source of other counter (e.q for counter 1 use 0, for 3 use 2)
I know that with Traditional-DAQ it will look like )see attch file):
Now the convertion to DAQmx :
++++++++++++++++++++++++++++++
void SetupEvent(void)
if ( Internal.P6602_ID == -1 ) return;
sprintf(Chan,"Dev%d/ctr1",Internal.P6602_ID); // channel 1
DAQmxErrChk (DAQmxCreateTask("EventChan1",&DaqmxTasks.PCI_6602[1]));
DAQmxErrChk (DAQmxCreateCICountEdgesChan(DaqmxTasks.PCI_6602[1],Chan,"EventChan1",DAQmx_Val_Rising,0,
DAQmx_Val_CountUp));
DAQmxErrChk (DAQmxSetTimingAttribute (DaqmxTasks.PCI_6602[1], DAQmx_SampTimingType, DAQmx_Val_SampClk) );
DAQmxErrChk (DAQmxSetTimingAttribute (DaqmxTasks.PCI_6602[1], DAQmx_SampQuant_SampMode,DAQmx_Val_ContSamps) );
DAQmxErrChk(DAQmxSetTimingAttribute (DaqmxTasks.PCI_6602[1],DAQmx_SampQuant_SampPerChan, BUF_MAX));
// set source
DAQmxErrChk (DAQmxSetTimingAttribute (DaqmxTasks.PCI_6602[1], DAQmx_SampClk_Src, "/Dev1/80MHzTimebase"));
// and gate
sprintf(msg,"/Dev%d/ctr0Source",Internal.P6602_ID);
DAQmxErrChk(DAQmxSetChanAttribute (DaqmxTasks.PCI_6602[1], Chan, DAQmx_CI_CountEdges_Term, msg,0));
sprintf(Chan,"Dev%d/ctr3",Internal.P6602_ID); // channel 3
DAQmxErrChk (DAQmxCreateTask("EventChan3",&DaqmxTasks.PCI_6602[3]));
DAQmxErrChk (DAQmxCreateCICountEdgesChan(DaqmxTasks.PCI_6602[3],Chan,"EventChan3",DAQmx_Val_Rising,0,
DAQmx_Val_CountUp));
DAQmxErrChk (DAQmxSetTimingAttribute (DaqmxTasks.PCI_6602[3], DAQmx_SampTimingType, DAQmx_Val_SampClk) );
DAQmxErrChk (DAQmxSetTimingAttribute (DaqmxTasks.PCI_6602[3], DAQmx_SampQuant_SampMode,DAQmx_Val_ContSamps) );
DAQmxErrChk(DAQmxSetTimingAttribute (DaqmxTasks.PCI_6602[3],DAQmx_SampQuant_SampPerChan, BUF_MAX));
DAQmxErrChk (DAQmxSetTimingAttribute (DaqmxTasks.PCI_6602[1], DAQmx_SampClk_Src, "/Dev1/80MHzTimebase"));
sprintf(msg,"/Dev%d/ctr2Source",Internal.P6602_ID);
DAQmxErrChk(DAQmxSetChanAttribute (DaqmxTasks.PCI_6602[3], Chan, DAQmx_CI_CountEdges_Term, msg,0));
return;
Error:
Internal.StartStop = OFF;
if ( DAQmxFailed(error) ) DAQmxGetExtendedErrorInfo(errBuff,1024);
StopCallBack();
MessagePopup ("SetupEvent Error", errBuff);
return;
I am not sure this is the way to do it .
Can samebody help ?
Thanks, Galia
Attachments:
AutoScannerDAQCards.c ‏20 KB