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download IQ to MXG

Question asked by overtheocean36 on Apr 11, 2011
Latest reply on Apr 17, 2015 by r.t

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Hi,

l'm trying to download an IQ signal in an MXG. the IQ signal is form a text file. Below if the code to download the I part of the signal, l get an error "ViTable::lookup - session 4390912 is out of range"

unsigned char* ibuffer = new unsigned char[I.count()*2];
    for(int index=0; index<I.count(); index++)
    {
        int ivalue=(short) (8192* (I.at(index)/ max_value + 1));
        ibuffer[index*2]   = ivalue / 256;; // high byte of i
        ibuffer[index*2+1] = ivalue - 256 * ibuffer[index*2];        // low byte of i
    }
    viWrite(vi,(ViBuf) ibuffer,I.count(),NULL);

it was working well with SICL command "iwrite(vi, ibuffer,I.count(),NULL);" but since l moved to VISa with viWrite...not working anymore.

anyone has an example how to download IQ file to MXG ?

regards,

Michael

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tabbott

Apr 20, 2011 1:52 PM

Hi Michael,

The only thing I can do is recommend that you refer to the examples in the Programming Guide, N5180-90005, page 348 – 357 Save and Recall Programming Example Using VISA and C#; and the example starting on page 358 User Flatness Correction Downloads Using C++ and VISA. You might see where you made an error by referring to these examples as they are using the same programming language.

Regards -

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r.t Apr 17, 2015 1:38 AM

HI,

I meet some problems with "iwrite" command, loading data stay to 0%. Did you remember how did you do that ?

Part of code :

sprintf(cmd, ":MEM:DATA \"WFM1:FILE1\", #%d%d", strlen(s), bytesToSend);
iwrite(id, cmd, strlen(cmd), 0, 0);
iwrite(id, iqbuffer, bytesToSend, 0, 0);
iwrite(id, "\n", 1, 1, 0);

Regards.

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2 Replies

tabbott Apr 20, 2011 1:52 PM
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Hi Michael,

The only thing I can do is recommend that you refer to the examples in the Programming Guide, N5180-90005, page 348 – 357 Save and Recall Programming Example Using VISA and C#; and the example starting on page 358 User Flatness Correction Downloads Using C++ and VISA. You might see where you made an error by referring to these examples as they are using the same programming language.

Regards -
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r.t Apr 17, 2015 1:38 AM
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HI,

I meet some problems with "iwrite" command, loading data stay to 0%. Did you remember how did you do that ?

Part of code :

sprintf(cmd, ":MEM:DATA \"WFM1:FILE1\", #%d%d", strlen(s), bytesToSend);
iwrite(id, cmd, strlen(cmd), 0, 0);
iwrite(id, iqbuffer, bytesToSend, 0, 0);
iwrite(id, "\n", 1, 1, 0);

Regards.
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download IQ to MXG

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