Agilent Technologies N5181A/82A, N5183A MXG, E8663B manual 250

Creating and Downloading Waveform Files

Programming Examples

//This is a text file to which we will write the

//I and Q data just for debugging purposes. It is

//a good programming practice to check your data

//in this way before attempting to write it to

//the instrument.

char *ofile = “c:\\SignalGenerator\\data\\iq.txt”;

//Create arrays to hold the I and Q data int idata[MAXSAMPLES];

int qdata[MAXSAMPLES];

//Often we must modify, scale, or offset the data

//before loading it into the instrument. These

//buffers are used for that purpose. Since each

//sample is 16 bits, and a character only holds

//8 bits, we must make these arrays twice as long

//as the I and Q data arrays.

char ibuffer[MAXSAMPLES*2]; char qbuffer[MAXSAMPLES*2];

//For the E4438C or E8267C/67D, we might also need to interleave

//the I and Q data. This buffer is used for that

//purpose. In this case, this buffer must hold

//both I and Q data so it needs to be four times

//as big as the data arrays.

char iqbuffer[MAXSAMPLES*4];

//Declare variables which will be used later bool done;

FILE *infile;

int index, numsamples, i1, i2, ivalue;

//In this example, we’ll assume the data files have

//the I and Q data in binary form as unsigned 16 bit integers.

//This next block reads those binary files. If your

//data is in some other format, then replace this block

//with appropriate code for reading your format.

//First read I values

done = false; index = 0;

infile = fopen(ifile, “rb”);

if (infile==NULL) perror (“Error opening file to read”);

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