Agilent Technologies InfiniiVision 5000 Series Programmer's Manual page 686

12
Programming Examples
}
/*
686
itimeout(id, 30000);
printf("Transferring image to c:\\scope\\data\\screen.bmp\n");
img_size = IMG_SIZE;
ipromptf(id, ":DISPLAY:DATA? BMP8bit, SCREEN, COLOR\n", "%#b\n",
&img_size, image_data);
printf("Read display data query (%d bytes).\n", img_size);
/* Write image data to file. */
fp = fopen ("c:\\scope\\data\\screen.bmp", "wb");
img_size = fwrite(image_data, sizeof(unsigned char), img_size, fp);
fclose (fp);
printf("Wrote image data (%d bytes) to file.\n", img_size);
itimeout(id, 5000);
/* MEASURE - The commands in the MEASURE subsystem are used to
* make measurements on displayed waveforms.
*/
/* Set source to measure. */
iprintf(id, ":MEASURE:SOURCE CHANNEL1\n");
/* Query for frequency. */
ipromptf(id, ":MEASURE:FREQUENCY?\n", "%lf", &frequency);
printf("The frequency is: %.4f kHz\n", frequency / 1000);
/* Query for peak to peak voltage. */
ipromptf(id, ":MEASURE:VPP?\n", "%lf", &vpp);
printf("The peak to peak voltage is: %.2f V\n", vpp);
/* WAVEFORM_DATA - Get waveform data from oscilloscope.
*/
get_waveform();
/* Make some calculations from the preamble data. */
vdiv = 32 * preamble [7];
off = preamble [8];
sdiv = preamble [2] * preamble [4] / 10;
delay = (preamble [2] / 2) * preamble [4] + preamble [5];
/* Print them out... */
printf ("Scope Settings for Channel 1:\n");
printf ("Volts per Division = %f\n", vdiv);
printf ("Offset = %f\n", off);
printf ("Seconds per Division = %f\n", sdiv);
printf ("Delay = %f\n", delay);
/* print out the waveform voltage at selected points */
for (i = 0; i < 1000; i = i + 50)
printf ("Data Point %4d = %6.2f Volts at %10f Seconds\n", i,
((float)waveform_data[i] - preamble[9]) * preamble[7] +
preamble[8],
((float)i - preamble[6]) * preamble[4] + preamble[5]);
save_waveform();
retrieve_waveform();
Agilent InfiniiVision 5000 Series Oscilloscopes Programmer's Guide
/* Save waveform data to disk. */
/* Load waveform data from disk. */