LeCroy DDA-3000A, Operator'S Manual

Page: 230 / 437

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WM-OM-E Rev I
// if the client app. was run before the scope then these events will be created,
// if the scope was run first then these events
// will just be opened
HANDLE m_hDataAvailable = CreateEvent(NULL, FALSE, FALSE /* initial state */ ,
szMutexDataAvailableName);
HANDLE m_hProcessingComplete = CreateEvent(NULL, FALSE, FALSE
/* initial state */ ,
szMutexProcessingCompleteName);
if (m_hDataAvailable == 0 || m_hProcessingComplete == 0)
{
printf("Unable to open events\n");
return 0;
}
// main loop
while (1)
{
int i = 0;
printf("Waiting for new data...\n");
// wait an infinite amount of time for data to be available
DWORD waitSuccess = WaitForSingleObject(m_hDataAvailable, INFINITE);
// print the first few bytes of the input waveform
CDescHeader *descHeader = (CDescHeader *) &m_lpMMFile[0];
short *m_lpWaveform = &m_lpMMFile[descHeader->headerSize / sizeof ( short )];
for (i = 0; i < 4; ++i)
printf("%f ", (m_lpWaveform[i] * descHeader->verGain) +
descHeader->verOffset);
// compute the mean of all data values, while computing the abs value of the waveform
//in-place
double sum = 0.0;
for (i = 0; i < descHeader->numSamples; ++i)
{
sum += (m_lpWaveform[i] * descHeader->verGain) + descHeader->verOffset;
m_lpWaveform[i] = abs(m_lpWaveform[i]);
}
sum /= descHeader->numSamples;
// modify the output units, set to Amps
strcpy(descHeader->verUnit, "A");
// print the mean, numer of samples, trigger time in seconds, and the segment index
printf(" (%f) %d %d %d\n", sum, descHeader->numSamples, ( int )
(descHeader->trigTime / lecTimeStampOneSecond), descHeader->segmentIndex);