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252 Agilent N518xA, E8663B, E44x8C, and E82x7D Signal Generators Programming Guide
Creating and Downloading Waveform Files
Programming Examples
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);
// The E443xB, E4438C, E8267C or E8267D all use big-endian
// processors. If your software is running on a little-endian
// processor such as Intel, then you will need to swap the
// bytes in the data before sending it to the signal generator.
// The arrays ibuffer and qbuffer are used to hold the data
// after any byte swapping, shifting or scaling.
// In this example, we’ll assume that the data is in the format
// of the E443xB without markers. In other words, the data
// is in the range 0-16383.
// 0 gives negative full-scale output
// 8192 gives 0 V output
// 16383 gives positive full-scale output
// If this is not the scaling of your data, then you will need
// to scale your data appropriately in the next two blocks.
// ibuffer and qbuffer will hold the data in the E443xB format.
// No scaling is needed, however we need to swap the byte order
// on a little endian computer. Remove the byte swapping
// if you are using a big endian computer.
for(index=0; index<numsamples; index++)
{
int ivalue = idata[index];
int qvalue = qdata[index];
ibuffer[index*2] = (ivalue >> 8) & 0xFF; // high byte of i
ibuffer[index*2+1] = ivalue & 0xFF; // low byte of i
qbuffer[index*2] = (qvalue >> 8) & 0xFF; // high byte of q
qbuffer[index*2+1] = qvalue & 0xFF; // low byte of q
}
// iqbuffer will hold the data in the E4438C, E8267C, E8267D
// format. In this format, the I and Q data is interleaved.
// The data is in the range -32768 to 32767.
// -32768 gives negative full-scale output