Agilent-technologies N5183A MXG Manual do Utilizador descarregar pdf (Página 246)

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

Creating and Downloading Waveform Files

Programming Examples

Creating and Storing I/Q Data—Little Endian Order

On the documentation CD, this programming example’s name is “CreateStore_Data_c++.txt.”

This C++ programming example (compiled using Metrowerks CodeWarrior 3.0) performs the following

functions:

•error checking

• data creation

• byte swapping and interleaving for little endian order data

• binary data file storing to a PC or workstation

After creating the binary file, you can use FTP, one of the download utilities, or one of the C++

download programming examples to download the file to the signal generator.

#include <iostream>

#include <fstream>

#include <math.h>

#include <stdlib.h>

using namespace std;

int main ( void )

{

ofstream out_stream; // write the I/Q data to a file

const unsigned int SAMPLES =200; // number of sample pairs in the waveform

const short AMPLITUDE = 32000; // amplitude between 0 and full scale dac value

const double two_pi = 6.2831853;

//allocate buffer for waveform

short* iqData = new short[2*SAMPLES];// need two bytes for each integer

if (!iqData)

{

cout << "Could not allocate data buffer." << endl;

return 1;

}

out_stream.open("IQ_data");// create a data file

if (out_stream.fail())

{

cout << "Input file opening failed" << endl;

exit(1);

}

//generate the sample data for I and Q. The I channel will have a sine

//wave and the Q channel will a cosine wave.

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Agilent-technologies N5183A MXG Manual do Utilizador Página 246