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

Creating and Downloading Waveform Files

Programming Examples

int ivalue = idata[index];

int qvalue = qdata[index];

iqbuffer[index*4] = (ivalue >> 8) & 0xFF; // high byte of i

iqbuffer[index*4+1] = ivalue & 0xFF; // low byte of i

iqbuffer[index*4+2] = (qvalue >> 8) & 0xFF; // high byte of q

iqbuffer[index*4+3] = qvalue & 0xFF; // low byte of q

}

// Big Endian order data, uncomment the following lines of code.

// Interleave the I and Q data.

// short iqbuffer[NUMSAMPLES*2]; // Big endian order, uncomment this line

// for(index=0; index<numsamples; index++) // Big endian order, uncomment this line

// { // Big endian order, uncomment this line

// iqbuffer[index*2] = idata[index]; // Big endian order, uncomment this line

// iqbuffer[index*2+1] = qdata[index]; // Big endian order, uncomment this line

// } // Big endian order, uncomment this line

// Open a connection to write to the instrument

INST id=iopen(instOpenString);

if (!id)

{

fprintf(stderr, “iopen failed (%s)\n”, instOpenString);

return -1;

}

// Declare variables to hold portions of the SCPI command

int bytesToSend;

char s[20];

char cmd[200];

bytesToSend = numsamples*4; // calculate the number of bytes

sprintf(s, “%d”, bytesToSend); // create a string s with that number of bytes

// The SCPI command has four parts.

// Part 1 = :MEM:DATA “filename”,#

// Part 2 = length of Part 3 when written to a string

// Part 3 = length of the data in bytes. This is in s from above.

// Part 4 = the buffer of data

// Build parts 1, 2, and 3 for the I and Q data.

sprintf(cmd, “:MEM:DATA \”WFM1:FILE1\”, #%d%d”, strlen(s), bytesToSend);

Agilent Technologies E4438C Programming Guide

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