Hi, I'm not sure how DAQmxWriteDigitalU8 function writes 4 digit sample. Does it write 0x04 data like 0000 0100 or just 0100 0000 ?
Looks like DAQmx ignores first four zero bits.
Here is a testing code
#define TEST 0x04
{
DAQmx_Digital_Output(taskHandle, NATDEVICE_NUM1, PORT_A, TEST);
...
}
{
int32 error=0;
int32 numWritten = 1;
if(DevNo == 1 && PortNo == 2){
DAQmxErrChk (DAQmxCreateTask("", &MX_DO_Handle));
DAQmxErrChk (DAQmxCreateDOChan(MX_DO_Handle,"Dev1/port1","",DAQmx_Val_ChanForAllLines)); // it has 8 lines
DAQmxErrChk (DAQmxWriteDigitalU8(MX_DO_Handle,1,1,0.0,DAQmx_Val_GroupByChannel,&iDataToWrite,&numWritten,NULL));
if(!error && iDataToWrite == 0x04){
printf("Writing iDataToWrite: 0x%X\n", iDataToWrite);
}
}
else
printf("Writing failure!\n");
...
}
From if(!error && iDataToWrite == 0x04) code, whatever I wrote it like == 0x4 or 0x04, it passes the condition without an error.
I wonder if DAQmxWriteDigitalU8 writes the data like 0100 0000. It should be 0000 0100.
I'm converting DAQ to DAQmx..from Parkoz.com
