Hello,
In my setup I use NI6602 card and the newest DAQmx driver for linux.
I would like to generate a single pulse on ctr0 using output of ctrl3 as a trigger. To do that I planned to create two tasks: main task which will generate a 1s pulse on ctrl0 and trigger task which generate 100ms trigger pulse on ctrl3. I tried following code, but it deosn't work:
#include <NIDAQmx.h>
#include <unistd.h>
int main()
{
//config of trigger task
TaskHandle triggerTask;
DAQmxCreateTask("TriggerTask",&triggerTask);
DAQmxSetReadAutoStart(triggerTask,FALSE);
DAQmxCreateCOPulseChanTicks(triggerTask, "Dev1/ctr3", "Channel_3", "80MHzTimebase", DAQmx_Val_Low, 0, 8000000, 8000000);
DAQmxCfgImplicitTiming(triggerTask,DAQmx_Val_FiniteSamps,1);
//config of main task
TaskHandle mainTask;
DAQmxCreateTask("MainTask",&mainTask);
DAQmxSetReadAutoStart(mainTask,FALSE);
DAQmxCreateCOPulseChanTicks(mainTask, "Dev1/ctr0", "Channel_0", "80MHzTimebase", DAQmx_Val_Low, 0, 2, 80000000);
DAQmxCfgImplicitTiming(mainTask, DAQmx_Val_FiniteSamps,1);
//config of trigger for main task
DAQmxSetStartTrigType(mainTask, DAQmx_Val_DigEdge);
DAQmxSetDigEdgeStartTrigSrc(mainTask, "Dev1/PFI38");
DAQmxSetDigEdgeStartTrigEdge(mainTask, DAQmx_Val_Rising);
DAQmxStartTask(mainTask);
DAQmxStartTask(triggerTask);
sleep(3);
DAQmxClearTask(mainTask);
DAQmxClearTask(triggerTask);
}
I do proper error handling, however I removed it here to make a code snippet shorter. There are no errors during program execution.
I suspect that I miss some trigger configuration on the mainTask, cause if I use only software trigger, both pulses (trigger and main) are generated correctly. I also tried with digital output as a signal for triggering, and it didn't work neither.
Thank you in advance for any hints.
