162 Chapter 4
Downloading and Using Files
Downloading ARB Waveform Data
Waveform Generation Using C++
The following program (Metrowerks CodeWarrior 3.0) creates an I/Q waveform and writes the data
to a file on your PC. Once the file is created, you can use the file transfer protocol (FTP) to download the
waveform data to the signal generator. Refer to “Using FTP” on page 157 for more information on FTP.
#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
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