DAQmxWriteDigitalU8 mod writing

Hi, I do not know how DAQmxWriteDigitalU8 function written 4 sample of numbers. He writes the data 0 x 04 like 0000 0100 or simply 0100 0000?

Looks like DAQmx ignores the first four bits to zero.

Here is a test code

#define TEST 0 x 04

{

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, "port1/Dev1", "", DAQmx_Val_ChanForAllLines)); It has 8 lines

DAQmxErrChk (DAQmxWriteDigitalU8(MX_DO_Handle,1,1,0.0,DAQmx_Val_GroupByChannel,&iDataToWrite,&numWritten,));

if (!) Error & iDataToWrite == 0x04) {}

printf ("iDataToWrite to writing: 0x%X\n", iDataToWrite);

}

}

on the other

printf ("failed to write! \n") ;

...

}

If (! error & iDataToWrite == 0x04) code, everything I wrote as == 0 x 4 or 0x04, it passes the condition without error.

I wonder if DAQmxWriteDigitalU8 writes the data as 0100 0000. It should be 0000 0100.

If you are writing 0x04 a 8-bit port, then what you get is:

line 0-0

line 1-0

line 2-1

line 3-0

line 4-0

line 5-0

line 6-0

line 7-0

0 is the lsb and it is no different in DAQmx and traditional DAQ.

Tags: NI Hardware

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