Agilent-technologies N5183A MXG Manual do Utilizador descarregar pdf (Página 225)

Agilent N518xA, E8663B, E44x8C, and E82x7D Signal Generators Programming Guide 215

Creating and Downloading Waveform Files

Creating Waveform Data

2. Save the I/Q data to a text file to review.

The following lines of code export the I and Q data to a text file for validation. After exporting the

data, open the file using Microsoft Excel or a similar spreadsheet program, and verify that the I and

Q data are correct.

3. Interleave the I and Q data, and byte swap if using little endian order.

This step has two sets of code:

• Interleaving and byte swapping I and Q data for little endian order

• Interleaving I and Q data for big endian order

For more information on byte order, see “Little Endian and Big Endian (Byte Order)” on page 186.

Line Code Description—Saving the I/Q Data to a Text File

char *ofile = "c:\\temp\\iq.txt";

FILE *outfile = fopen(ofile, "w");

if (outfile==NULL) perror ("Error opening file to write");

for(index=0; index<numsamples; index++)

{

fprintf(outfile, "%d, %d\n", idata[index], qdata[index]);

}

fclose(outfile);

Line Code Description—Saving the I/Q Data to a Text File

12 Set the absolute path of a text file to a character variable. In this example, iq.txt is the file name and *ofile

is the variable name.

For the file path, some operating systems may not use the drive prefix (‘c:’ in this example), or may require

only a single forward slash (/), or both ("/temp/iq.txt")

13 Open the text file in write format.

14 If the text file does not open, print an error message.

15–18 Create a loop that prints the array of generated I and Q data samples to the text file.

19 Close the text file.

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Agilent-technologies N5183A MXG Manual do Utilizador Página 225