Agilent Technologies E8257D PSG Instrukcja Użytkownika Pobierz pdf (Strona 243)

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Agilent N516xA, N518xA, E8663B, E44x8C, and E82x7D Signal Generators Programming Guide 231

Creating and Downloading Waveform Files

Creating Waveform Data

Line Code—Interleaving and Byte Swapping for Little Endian Order

char iqbuffer[NUMSAMPLES*4];

for(index=0; index<numsamples; index++)

{

short ivalue = idata[index];

short qvalue = qdata[index];

iqbuffer[index*4] = (ivalue >> 8) & 0xFF;

iqbuffer[index*4+1] = ivalue & 0xFF;

iqbuffer[index*4+2] = (qvalue >> 8) & 0xFF;

iqbuffer[index*4+3] = qvalue & 0xFF;

}

return 0;

Line Code Description—Interleaving and Byte Swapping for Little Endian Order

20 Define a character array to store the interleaved I and Q data. The character array makes byte swapping

easier, since each array location accepts only 8 bits (1 byte). The array size increases by four times to

accommodate two bytes of I data and two bytes of Q data.

21–29 Create a loop to do the following:

• Save the current I data array value to a variable.

NOTE In rare instances, a compiler may define short as larger than 16 bits. If this condition exists,

replace short with the appropriate object or label that defines a 16–bit integer.

• Save the current Q data array value to a variable.

• Swap the low bytes (bits 0–7) of the data with the high bytes of the data (done for both

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