9Programming Examples
printf("Preamble YINCREMENT: %e\n", preamble[7]);
printf("Preamble YORIGIN: %e\n", preamble[8]);
printf("Preamble YREFERENCE: %e\n", preamble[9]); */
/* QUERY_WAVE_DATA - Outputs waveform records to the controller
*over the interface that is stored in a buffer previously
*specified with the ":WAVEFORM:SOURCE" command.
*/ |
|
viPrintf(vi, ":WAVEFORM:DATA?\n"); | /* Query waveform data. */ |
/* READ_WAVE_DATA - The wave data consists of two parts: the header,
*and the actual waveform data followed by an New Line (NL)
*character. The query data has the following format:
*
*<header><waveform data block><NL>
*Where:
*
*<header> = #800002048 (this is an example header)
*The "#8" may be stripped off of the header and the remaining
*numbers are the size, in bytes, of the waveform data block.
*The size can vary depending on the number of points acquired
*for the waveform which can be set using the ":WAVEFORM:POINTS"
*command. You may then read that number of bytes from the
*oscilloscope; then, read the following NL character to
*terminate the query.
*/
waveform_size = WAVE_DATA_SIZE; /* Read waveform data. */
viScanf(vi, "%#b\n", &waveform_size, waveform_data); if ( waveform_size == WAVE_DATA_SIZE )
{
printf("Waveform data buffer full: "); printf("May not have received all points.\n");
}
else
{
printf("Reading waveform data... size = %d\n", waveform_size);
}
}
/*
*save_waveform
*
*This function saves the waveform data from the get_waveform
*function to disk. The data is saved to a file called "wave.dat". */
void save_waveform(void)
{
FILE *fp;
fp = fopen("c:\\scope\\data\\wave.dat", "wb"); /* Write preamble. */
fwrite(preamble, sizeof(preamble[0]), 10, fp);
566 | Agilent InfiniiVision 5000 Series Oscilloscopes Programmer's Reference |
