Hello,
I've bought a USB-6009 and downloaded the NI-DAQmx Base software on to my MacBook running OS 10.7.2. When running lsdaq I was told to update the firmware on the USB-6009, so I did using FWUpdate.
The examples that come with NI-DAQmx Base compile ok, but cause an error when they run. The error is- Bus Error: 10
I think this is an OS error, but it is occuring when the following line is executed- DAQmxErrChk (DAQmxBaseCreateTask("",&taskHandle));
This line of code seem fine when I read the documentation. Furthermore it is consistent with every example and code snippet I can find. Has anyone experienced this problem and/or know how to solve it?
Thanks
Lee.
P.S. I was unable to attach the source file because the stupid forum says I have set the wrong content type for the file extension, but it does not let me change the content type. So I've pasted it below.
#include "NIDAQmxBase.h"
#include <stdio.h>
#include <time.h>
#define DAQmxErrChk(functionCall) { if( DAQmxFailed(error=(functionCall)) ) { goto Error; } }
int main(int argc, char *argv[])
{
// Task parameters
int32 error = 0;
TaskHandle taskHandle = 0;
char errBuff[2048]={'\0'};
int32 i,j;
time_t startTime;
bool32 done=0;
// Channel parameters
char chan[] = "Dev1/ai0, Dev1/ai1";
float64 min = -10.0;
float64 max = 10.0;
// Timing parameters
char clockSource[] = "OnboardClock";
uInt64 samplesPerChan = 1000;
float64 sampleRate = 5000.0;
// Data read parameters
#define bufferSize (uInt32)1000
float64 data[bufferSize * 2];
int32 pointsToRead = bufferSize;
int32 pointsRead;
float64 timeout = 10.0;
int32 totalRead = 0;
printf("Press Ctrl-C to exit\n");
DAQmxErrChk (DAQmxBaseCreateTask("",&taskHandle));
DAQmxErrChk (DAQmxBaseCreateAIVoltageChan(taskHandle,chan,"",DAQmx_Val_Cfg_Default,min,max,DAQmx_Val_Volts,NULL));
DAQmxErrChk (DAQmxBaseCfgSampClkTiming(taskHandle,clockSource,sampleRate,DAQmx_Val_Rising,DAQmx_Val_ContSamps,samplesPerChan));
DAQmxErrChk (DAQmxBaseCfgInputBuffer(taskHandle,200000)); //use a 100,000 sample DMA buffer
DAQmxErrChk (DAQmxBaseStartTask(taskHandle));
// The loop will quit after 10 seconds
startTime = time(NULL);
while( time(NULL)<startTime+10 ) {
DAQmxErrChk (DAQmxBaseReadAnalogF64(taskHandle,pointsToRead,timeout,DAQmx_Val_GroupByScanNumber,data,bufferSize*2,&pointsRead,NULL));
totalRead += pointsRead;
printf("Acquired %d samples. Total %d\n",(int)pointsRead,(int)totalRead);
// Just print out the first 10 points of the last data read
for (i = 0; i < 10; ++i)
printf ("data0[%d] = %f\tdata1[%d] = %f\n",(int)i,data[2*i],(int)i,data[2*i+1]);
}
printf("\nAcquired %d total samples.\n",(int)totalRead);
Error:
if( DAQmxFailed(error) )
DAQmxBaseGetExtendedErrorInfo(errBuff,2048);
if(taskHandle != 0) {
DAQmxBaseStopTask (taskHandle);
DAQmxBaseClearTask (taskHandle);
}
if( DAQmxFailed(error) )
printf ("DAQmxBase Error %d: %s\n", (int)error, errBuff);
return 0;
}
